CN108531816A - A kind of 500MPa grades of steel for engineering machinery and its manufacturing method - Google Patents
A kind of 500MPa grades of steel for engineering machinery and its manufacturing method Download PDFInfo
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- CN108531816A CN108531816A CN201810513565.8A CN201810513565A CN108531816A CN 108531816 A CN108531816 A CN 108531816A CN 201810513565 A CN201810513565 A CN 201810513565A CN 108531816 A CN108531816 A CN 108531816A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 121
- 239000010959 steel Substances 0.000 title claims abstract description 121
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 16
- 239000004615 ingredient Substances 0.000 claims abstract description 15
- 229910052796 boron Inorganic materials 0.000 claims abstract description 13
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 13
- 238000005496 tempering Methods 0.000 claims abstract description 11
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 9
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 9
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 8
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 45
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 38
- 238000005096 rolling process Methods 0.000 claims description 25
- 229910045601 alloy Inorganic materials 0.000 claims description 20
- 239000000956 alloy Substances 0.000 claims description 20
- 229910052757 nitrogen Inorganic materials 0.000 claims description 19
- 229910052760 oxygen Inorganic materials 0.000 claims description 19
- 239000001301 oxygen Substances 0.000 claims description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 14
- 238000005275 alloying Methods 0.000 claims description 14
- 239000001257 hydrogen Substances 0.000 claims description 14
- 229910052739 hydrogen Inorganic materials 0.000 claims description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 3
- 238000013019 agitation Methods 0.000 claims description 3
- 239000011324 bead Substances 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 19
- 229910052717 sulfur Inorganic materials 0.000 abstract description 18
- 229910052748 manganese Inorganic materials 0.000 abstract description 17
- 229910052710 silicon Inorganic materials 0.000 abstract description 15
- 229910052782 aluminium Inorganic materials 0.000 abstract description 10
- 238000007670 refining Methods 0.000 description 26
- 238000009628 steelmaking Methods 0.000 description 13
- 238000003303 reheating Methods 0.000 description 11
- 238000009749 continuous casting Methods 0.000 description 10
- 229910052804 chromium Inorganic materials 0.000 description 6
- 230000000171 quenching effect Effects 0.000 description 5
- 238000010791 quenching Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000005204 segregation Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a kind of 500MPa grades of steel for engineering machinery and its manufacturing method, which includes the ingredient of following mass percent：C：0.12~0.23%, Si：0.10~0.60%, Mn：0.80~1.90%, P：＜ 0.018%, S：＜ 0.010%；And it is selected from Cr：0~0.50%, Ni：0~0.60%, Mo：0~0.45%, Cu：0~0.40%, Nb：0~0.060%, V：0~0.15%, Ti：0~0.12%, B：0~0.0030%, Al：It is one or more in 0.010~0.050%；Surplus is Fe and inevitable impurity.Its metallographic structure is uniform tiny martensite high tempering tissue, to have good mechanical property and fatigue behaviour.Its fatigue life, more existing engineering machinery steel grade was obviously improved.
Description
Technical field
The present invention relates to a kind of steel alloy technologies, and in particular to a kind of 500MPa grades of steel for engineering machinery and its manufacturer
Method.
Background technology
Currently, steel for engineering machinery uses two kinds of Q235B and SS400, such as excavator swing arm dipper substantially, load motor-driven
Arm etc..Its yield strength meets room temperature impact property, service life is within 30000h in 235MPa.Its yield strength and tired
The labor service life is apparent insufficient.
Application No. is 201310289099.7, entitled " a kind of 500MPa grades of Ultra-fine Grained steel for engineering machinery and manufacturer
The Chinese patent of method ", discloses the steel for engineering machinery that a kind of yield strength is more than 500MPa, and C content is 0.04~
0.08%, it is unfavorable for quenched martensite and is formed.The steel plate is there are cost of alloy height, and deformed steel strip, performance is unstable, blanking deformation
The problems such as larger.
Invention content
Goal of the invention：In order to overcome the deficiencies of existing technologies, the present invention provides a kind of 500MPa grades of steel for engineering machinery,
The yield strength of the steel grade is more than 500MPa, has higher fatigue life.
It is a further object of the present invention to provide a kind of manufacturing method of 500MPa grades of steel for engineering machinery, this method can give birth to
Produce the 500MPa grade steel for engineering machinery having compared with high fatigue life.
Technical solution：A kind of 500MPa grades of steel for engineering machinery of the present invention, including following mass percent at
Point：C：0.12~0.23%,
Si：0.10~0.60%,
Mn：0.80~1.90%,
P：＜ 0.018%,
S：＜ 0.010%；
And it is selected from Cr：0~0.50%, Ni：0~0.60%, Mo：0~0.45%, Cu：0~0.40%, Nb：0~
0.060%, V：0~0.15%, Ti：0~0.12%, B：0~0.0030%, Al：One kind or more in 0.010~0.050%
Kind；
Surplus is Fe and inevitable impurity.
The metallographic structure of the 500MPa grades of steel for engineering machinery is uniform tiny martensite high tempering tissue.
The restriction reason of each chemical constituent mass percentage content is as follows in the 500MPa grades of steel for engineering machinery：
C element can dramatically increase matrix strength by solution strengthening, while its content is too low is unfavorable for quenched martensite
Formation, but the excessively high welding performance for being also unfavorable for material of C content.Therefore, the present invention C content controlled 0.12~
0.23% level.
Si is deoxidant element in steelmaking process, and appropriate Si can inhibit the segregation of Mn and P, and O content is excessively high, Mn and P
Segregation can all damage toughness, in addition, Si can also generate solution strengthening, Si elements appropriate are conducive to tempered structure performance stabilization
Improve.But Si too high levels can form field trash.The present invention controls Si 0.10~0.60%.
Main alloy elements of the Mn as steel plate of the present invention is ferritizing strengthening element, and content is very few not to have conjunction
Aurification and quenching effect, again can be very unfavorable to welding performance but content is excessive, and less economical.Therefore, Mn is controlled
0.80~1.90%.
P, S belongs to the harmful element in molten steel, and excessive P, S can be harmful to the toughness of steel, impacted to welding performance,
It is easy to form crackle.Theoretically the fewer both elements the better, and P is controlled and controlled in ＜ in ＜ 0.018%, S by the present invention
0.010%；
The elements such as Cr, Ni, Mo, Cu, Nb, V, Ti, B, Al are non-master guide element in this steel grade, wherein a small amount of be added
The elements such as Cr, Ni, Mo are conducive to alloying and the quenching of steel grade, and addition Ti, B, Al appropriate etc. can improve quenching degree.But
It is that these elements one side not enough economy is excessively added, on the other hand can also forms unnecessary non-metallic inclusion.So root
Cooperation is acted on according to alloy to accept or reject, can meet design, is more advantageous to and is saved alloy resource and improve the processing performances such as welding bending.
The present invention is acted on according to alloy from Cr on the basis of limiting C, Si, Mn, P, S：0~0.50%, Ni：0~0.60%, Mo：0
~0.45%, Cu：0~0.40%, Nb：0~0.060%, V：0~0.15%, Ti：0~0.12%, B：0~0.0030%,
Al：One or more, Proper Match is chosen in 0.010~0.050% equal elements.
The manufacturing method of a kind of 500MPa grades of steel for engineering machinery of the present invention, under used technical solution includes
State step：
(1) smelting molten steel：Preparation meets into the molten steel being grouped as；
(2) it is cast into base：Molten steel is sent into conticaster whole process argon for protecting pouring, while electromagnetic agitation, pulling rate 0.75~
1.2m/min obtains strand；
(3) heating strand：Strand is evenly heated 3.5~4.5 hours at 1100~1220 DEG C；
(4) it rolls：Using four roll reversing roller two-phase control rollings, roughing rolls reduction ratio and is more than 60%, roughing open rolling temperature
1070~1180 DEG C of degree, 890~950 DEG C of two-stage start rolling temperature, 820~900 DEG C of finishing temperature obtains steel plate；
(5) control cooling：After accelerating outlet steel plate residual water purging in cold-zone clean, steel plate anti-red temperature 650~690 is measured
℃；
(6) it aligns：Steel plate is aligned, 3~6mm/m of control aligning unevenness；
(7) bead：Remove surface of steel plate iron scale；
(8) to remove iron scale steel plate be heat-treated to get.
Wherein, prepared composition forms satisfactory molten steel in step (1), includes the following steps：
(1.1) molten iron pre-processes, and makes the S in molten iron：＜ 0.010%；
(1.2) converter is added in pretreated molten iron, deoxidation alloying, the conjunction of addition is smelted and carried out using BOF methods
Gold matches the 90% of dosage for alloy in design molten steel composition；
(1.3) LF stoves refine 15~30min, and fine tuning alloying component makes alloying component meet the requirements, and promotes liquid steel temperature；
(1.4) RH Fruit storages 15-30 minutes, RH BOTTOM ARGON BLOWINGs rationally stir and the removal non-metallic inclusion that floats,
Reduce nitrogen hydrogen-oxygen content；
(1.5) feeding calcium line purify molten steel, make strip MnS non-metallic inclusions become dispersion, shorten spheroidization to get.
Heat treatment is that steel plate is first heated to 880~920 using nitrogen protection non-oxidation roller hearth furnace in the step (8)
℃；Then the quenching of roller press type water knife is carried out to steel plate；It is handled again in 550~660 DEG C of high temperings.
Advantageous effect：500MPa grades of steel for engineering machinery of the present invention, it is secondary outside stove by rational composition design
Refining, and unique manufacturing process is used, make steel cleaning, crystal grain refinement, improves obdurability.The metallographic structure of the steel grade is equal
Even and fine small martensite high tempering tissue, to obtain good mechanical property and fatigue behaviour, the yield strength of steel grade
Reach 500MPa or more, tensile strength reaches 600MPa or more, which is suitable for engineering machinery, and fatigue life is more existing
Engineering machinery steel grade promotes 30% or more, meets the subzero 40 DEG C of low-temperature flexibility demands of engineering machinery.And the alloy member of the steel grade
Element can act on cooperation according to alloy and accept or reject, and effectively control the production cost of steel grade.
Specific implementation mode
In the following, be described in further details to the present invention in conjunction with the embodiments.
It is more than in order to which existing steel for engineering machinery is upgraded to yield strength from the Q235B of yield strength 235MPa
The endurance engineering machinery material of new generation of 500MPa, the present invention propose a kind of 500MPa grades of steel for engineering machinery, the steel grade
Ingredient in terms of quality percentage, including C：0.12~0.23%, Si：0.10~0.60%, Mn：0.80~1.90%, P：＜
0.018%, S：＜ 0.010%；And it is selected from Cr：0~0.50%, Ni：0~0.60%, Mo：0~0.45%, Cu：0~
0.40%, Nb：0~0.060%, V：0~0.15%, Ti：0~0.12%, B：0~0.0030%, Al：0.010~0.050%
In it is one or more；Surplus is Fe and inevitable impurity.By special manufacturing process, the metallographic structure of the steel grade is
Uniformly tiny martensite high tempering tissue, to obtain good mechanical property and fatigue behaviour.
And a kind of manufacturing method of 500MPa grades of steel for engineering machinery of the present invention, used technical solution include
Following step：
(1) following step smelting is used to meet into the molten steel being grouped as first：Molten iron pretreatment is first carried out, is made in molten iron
S：And then pretreated molten iron is added converter, is smelted using BOF methods and carry out deoxidation alloying, phase by ＜ 0.010%
Between, the alloy of addition is to design alloy in molten steel composition to match the 90% of dosage；Then by above-mentioned molten steel be sent into LF stoves refining 15~
30min, deoxidation, fine tuning alloying component make alloying component meet the requirements, and promote liquid steel temperature by technique；Molten steel is sent into RH essences
Furnace Fruit storage 15-30 minutes, RH BOTTOM ARGON BLOWINGs rationally stir and the removal non-metallic inclusion that floats, and reduce nitrogen hydrogen-oxygen and contain
Amount, control nitrogen content of molten steel are not higher than 38ppm, and hydrogen content is not higher than 1.5ppm, and oxygen content is not higher than 20ppm；Then calcium is fed
Line purifies molten steel, so that strip MnS non-metallic inclusions is become dispersion, the spheroidization that shortens is to get satisfactory molten steel.
(2) it is cast into base：Molten steel is sent into conticaster whole process argon for protecting pouring, while electromagnetic agitation mitigation low power is inclined
Analysis, and 0.75~1.2m/min of pulling speed of continuous casting is controlled, obtain strand；
(3) heating strand：Strand is evenly heated 3.5~4.5 hours at 1100~1220 DEG C, prevents heating time mistake
Short-range missile causes the heating of strand center impermeable, meanwhile, the reasonable controlled rolling time, prevents heating time mistake suitable for rolling
The long waste for causing the energy；
(4) it rolls：Using four roll reversing roller two-phase control rollings, roughing rolls reduction ratio and is more than 60%, roughing open rolling temperature
1070~1180 DEG C of degree, 890~950 DEG C of two-stage start rolling temperature, 820~900 DEG C of finishing temperature obtains steel plate；
(5) control cooling：After accelerating outlet steel plate residual water purging in cold-zone clean, steel plate anti-red temperature 650~690 is measured
℃；
(6) it aligns：Steel plate is aligned, 3~6mm/m of control aligning unevenness；
(7) bead：Remove surface of steel plate iron scale；
(8) steel plate for removing iron scale is heat-treated, specifically, first using nitrogen protection non-oxidation roller hearth furnace by steel
Plate is heated to 880~920 DEG C；Then the quenching of roller press type water knife is carried out to steel plate；It is handled again in 550~660 DEG C of high temperings, i.e.,
.
Embodiment one, 75mm specification Q500E steel plates, includes the ingredient C of following mass percents：0.18%, Si：
0.27%, Mn：1.53%, P：0.011%, S：0.006%, Cr：0.25%, V：0.035%, Ti：0.019%, B：
0.0009%, surplus is Fe and inevitable impurity.After steelmaking alloy deoxidation, LF refining 25 minutes, RH vacuum refinings take off
Gas 30 minutes makes nitrogen content of molten steel be not higher than 38ppm, and hydrogen content is not higher than 1.5ppm, and oxygen content is not higher than 20ppm；Slab connects
Casting, pulling rate 0.75m/min；Reheating 3.8h makes strand central temperature reach 1170 DEG C, and 1120 DEG C of start rolling temperature, two sections roll
890 DEG C, 830 DEG C of finishing temperature, reduction ratio 61%；650 DEG C of steel plate red temperature；Align 3mm/m；890 DEG C of hardening heat, tempering
650 DEG C of temperature.Mechanical property yield strength 530MPa, tensile strength 620MPa, elongation percentage 21%, -40 DEG C of ballistic work 186J,
191J,197J(10*10mm)。
Embodiment two, 10mm specification Q500E steel plates, includes the ingredient C of following mass percents：0.15%, Si：
0.23%, Mn：1.49%, P：0.013%, S：0.005%, Cr：0.17%, V：0.033%, Ti：0.016%, B：
0.0011%, surplus is Fe and inevitable impurity.After steelmaking alloy deoxidation, LF refining 30 minutes, RH vacuum refinings take off
Gas 25 minutes makes nitrogen content of molten steel be not higher than 38ppm, and hydrogen content is not higher than 1.5ppm, and oxygen content is not higher than 20ppm；Slab connects
Casting, pulling rate 1.2m/min；Reheating 4.0h makes strand central temperature reach 1180 DEG C, and 1140 DEG C of start rolling temperature, two sections roll 900
DEG C, 850 DEG C of finishing temperature, reduction ratio 65%；680 DEG C of steel plate red temperature；Align 5mm/m；900 DEG C of hardening heat, tempering temperature
650 DEG C of degree.Mechanical property yield strength 545MPa, tensile strength 650MPa, elongation percentage 20%, -40 DEG C of ballistic works 97J, 99J,
93J(5*10mm)。
Embodiment three, 22mm specification Q500E include the ingredient C of following mass percents：0.16%, Si：0.20%, Mn：
1.33%, P：0.013%, S：0.005%, Ni：0.20%, Nb：0.026%, Ti：0.016%, B：0.0011%, surplus is
Fe and inevitable impurity.After steelmaking alloy deoxidation, LF refining 26 minutes, RH vacuum refinings deaerate 29 minutes, make molten steel
Nitrogen content is not higher than 38ppm, and hydrogen content is not higher than 1.5ppm, and oxygen content is not higher than 20ppm；Sheet billet continuous casting, pulling rate 1.2m/min；
Reheating 4.2h makes strand central temperature reach 1190 DEG C, and 1140 DEG C of start rolling temperature, two sections roll 950 DEG C, finishing temperature 850
DEG C, reduction ratio 65%；690 DEG C of steel plate red temperature；Align 6mm/m；900 DEG C of hardening heat, 640 DEG C of temperature.Mechanical property
Can yield strength 530MPa, tensile strength 645MPa, elongation percentage 22%, -40 DEG C of ballistic work 192J, 190J, 192J (10*
10mm)。
Example IV, 8mm specification Q500E include the ingredient C of following mass percents：0.15%, Si：0.23%, Mn：
1.26%, P：0.013%, S：0.005%, Mo：0.17%, Al：0.027%, surplus is Fe and inevitable impurity.Steel-making
After alloying deoxidation, LF refining 28 minutes, RH vacuum refinings deaerate 28 minutes, and nitrogen content of molten steel is made to be not higher than 38ppm, hydrogen content
Not higher than 1.5ppm, oxygen content is not higher than 20ppm；Sheet billet continuous casting, pulling rate 1.0m/min；Reheating 4.0h makes strand central temperature
Reach 1175 DEG C, 1130 DEG C of start rolling temperature, two sections roll 920 DEG C, 870 DEG C of finishing temperature, reduction ratio 76%；Steel plate red temperature
690℃；Align 6mm/m；910 DEG C of hardening heat, 640 DEG C of temperature.Mechanical property yield strength 540MPa, tensile strength
660MPa, elongation percentage 19%, -40 DEG C of ballistic work 86J, 86J, 83J (5*10mm).
Embodiment five, 18mm specification Q500E include the ingredient C of following mass percents：0.17%, Si：0.26%, Mn：
1.50%, P：0.012%, S：0.003%, Cr：0.15%, Cu：0.016%, Al：0.027%, Ti：0.022%, B：
0.0015%, surplus is Fe and inevitable impurity.After steelmaking alloy deoxidation, LF refining 26 minutes, RH vacuum refinings take off
Gas 15 minutes makes nitrogen content of molten steel be not higher than 38ppm, and hydrogen content is not higher than 1.5ppm, and oxygen content is not higher than 20ppm；Slab connects
Casting, pulling rate 1.0m/min；Reheating 4.0h makes strand central temperature reach 1180 DEG C, and 1135 DEG C of start rolling temperature, two sections roll 920
DEG C, 870 DEG C of finishing temperature, reduction ratio 73%；690 DEG C of steel plate red temperature；Align 6mm/m；910 DEG C of hardening heat, tempering temperature
630 DEG C of degree.Mechanical property yield strength 543MPa, tensile strength 659MPa, elongation percentage 21%, -40 DEG C of ballistic work 126J,
123J,129J(10*10mm)。
Embodiment six, 50mm specification Q500E steel plates, includes the ingredient C of following mass percents：0.12%, Si：0.6%,
Mn：0.8%, P：0.017%, S：0.006%, Cr：0.50%, surplus is Fe and inevitable impurity.Steelmaking alloy is de-
After oxygen, LF refining 15 minutes, RH vacuum refinings deaerate 30 minutes, and nitrogen content of molten steel is made to be not higher than 38ppm, and hydrogen content is not higher than
1.5ppm, oxygen content are not higher than 20ppm；Sheet billet continuous casting, pulling rate 0.75m/min；Reheating 3.5h makes strand central temperature reach
1100 DEG C, 1070 DEG C of start rolling temperature, two sections of 890 DEG C of rollings, 820 DEG C of finishing temperature, reduction ratio 75%；Steel plate red temperature 650
℃；Align 4mm/m；880 DEG C of hardening heat, 620 DEG C of temperature.Mechanical property yield strength 542MPa, tensile strength
629MPa, elongation percentage 21%, -40 DEG C of ballistic work 132J, 139J, 130J (10*10mm).
Embodiment seven, 10mm specification Q500E steel plates, includes the ingredient C of following mass percents：0.23%, Si：
0.10%, Mn：1.9%, P：0.013%, S：0.009%, V：0.15%, Ti：0.025wt.%, B：0.003wt.%, surplus
For Fe and inevitable impurity.After steelmaking alloy deoxidation, LF refining 15 minutes, RH vacuum refinings deaerate 25 minutes, make steel
Water nitrogen content is not higher than 38ppm, and hydrogen content is not higher than 1.5ppm, and oxygen content is not higher than 20ppm；Sheet billet continuous casting, pulling rate 0.9m/
min；Reheating 4.5h makes strand central temperature reach 1220 DEG C, and 1180 DEG C of start rolling temperature, two sections roll 950 DEG C, finishing temperature
900 DEG C, reduction ratio 63%；690 DEG C of steel plate red temperature；Align 5mm/m；920 DEG C of hardening heat, 660 DEG C of temperature.Mechanics
Performance yield strength 548MPa, tensile strength 646MPa, elongation percentage 20%, -40 DEG C of ballistic work 55J, 69J, 78J (5*10mm).
Embodiment eight, 22mm specification Q500E include the ingredient C of following mass percents：0.12%, Si：0.53%, Mn：
1.56%, P：0.012%, S：0.003%, Ni：0.60%, surplus is Fe and inevitable impurity.Steelmaking alloy deoxidation
Afterwards, LF refining 20 minutes, RH vacuum refinings deaerate 25 minutes, and nitrogen content of molten steel is made to be not higher than 38ppm, and hydrogen content is not higher than
1.5ppm, oxygen content are not higher than 20ppm；Sheet billet continuous casting, pulling rate 1.1m/min；Reheating 3.5h makes strand central temperature reach
1130 DEG C, 1100 DEG C of start rolling temperature, two sections of 910 DEG C of rollings, 820 DEG C of finishing temperature, reduction ratio 61%；Steel plate red temperature 650
℃；Align 6mm/m；880 DEG C of hardening heat, 620 DEG C of temperature.Mechanical property yield strength 539MPa, tensile strength
642MPa, elongation percentage 22%, -40 DEG C of ballistic work 191J, 195J, 193J (10*10mm).
Embodiment nine, 8mm specification Q500E include the ingredient C of following mass percents：0.16%, Si：0.13%, Mn：
0.90%, P：0.011%, S：0.001%, Mo：0.45%, Al：0.05%, surplus is Fe and inevitable impurity.Steel-making
After alloying deoxidation, LF refining 26 minutes, RH vacuum refinings deaerate 28 minutes, and nitrogen content of molten steel is made to be not higher than 38ppm, hydrogen content
Not higher than 1.5ppm, oxygen content is not higher than 20ppm；Sheet billet continuous casting, pulling rate 1.0m/min；Reheating 4.3h makes strand central temperature
Reach 1210 DEG C, 1180 DEG C of start rolling temperature, two sections roll 940 DEG C, 900 DEG C of finishing temperature, reduction ratio 89%；Steel plate red temperature
690℃；Align 3mm/m；910 DEG C of hardening heat, 640 DEG C of temperature.Mechanical property yield strength 556MPa, tensile strength
662MPa, elongation percentage 20%, -40 DEG C of ballistic work 58J, 47J, 48J (5*10mm).
Embodiment ten, 30mm specification Q500E include the ingredient C of following mass percents：0.12%, Si：0.17%, Mn：
1.21%, P：0.010%, S：0.003%, Cu：0.40%, Al：0.010%, surplus is Fe and inevitable impurity.Steel-making
After alloying deoxidation, LF refining 21 minutes, RH vacuum refinings deaerate 25 minutes, and nitrogen content of molten steel is made to be not higher than 38ppm, hydrogen content
Not higher than 1.5ppm, oxygen content is not higher than 20ppm；Sheet billet continuous casting, pulling rate 0.85m/min；Reheating 4.0h makes strand center temperature
Degree reaches 1150 DEG C, 1130 DEG C of start rolling temperature, and two sections roll 900 DEG C, 820 DEG C of finishing temperature, reduction ratio 61%；Steel plate returns red temperature
650 DEG C of degree；Align 3mm/m；920 DEG C of hardening heat, 620 DEG C of temperature.Mechanical property yield strength 546MPa, tensile strength
655MPa, elongation percentage 21%, -40 DEG C of ballistic work 217J, 219J, 221J (10*10mm).
Embodiment 11,20mm specification Q500E steel plates, includes the ingredient C of following mass percents：0.23%, Si：
0.46%, Mn：0.95%, P：0.016%, S：0.009%, Nb：0.06%, surplus is Fe and inevitable impurity.Steel-making
After alloying deoxidation, LF refining 30 minutes, RH vacuum refinings deaerate 30 minutes, and nitrogen content of molten steel is made to be not higher than 38ppm, hydrogen content
Not higher than 1.5ppm, oxygen content is not higher than 20ppm；Sheet billet continuous casting, pulling rate 0.9m/min；Reheating 3.9h makes strand central temperature
Reach 1200 DEG C, 1180 DEG C of start rolling temperature, two sections roll 950 DEG C, 900 DEG C of finishing temperature, reduction ratio 66%；Steel plate red temperature
680℃；Align 3mm/m；920 DEG C of hardening heat, 600 DEG C of temperature.Mechanical property yield strength 545MPa, tensile strength
636MPa, elongation percentage 21%, -40 DEG C of ballistic work 188J, 193J, 199J (10*10mm).
Embodiment 12,10mm specification Q500E steel plates, includes the ingredient C of following mass percents：0.17%, Si：
0.10%, Mn：1.10%, P：0.013%, S：0.003%, Ti：0.12%, B：0.0030%, surplus is for Fe and unavoidably
Impurity.After steelmaking alloy deoxidation, LF refining 25 minutes, RH vacuum refinings deaerate 25 minutes, and nitrogen content of molten steel is made to be not higher than
38ppm, hydrogen content are not higher than 1.5ppm, and oxygen content is not higher than 20ppm；Sheet billet continuous casting, pulling rate 0.95m/min；Reheat 4.2h
Strand central temperature is set to reach 1210 DEG C, 1170 DEG C of start rolling temperature, two sections roll 940 DEG C, 890 DEG C of finishing temperature, reduction ratio
64%；690 DEG C of steel plate red temperature；Align 4mm/m；910 DEG C of hardening heat, 550 DEG C of temperature.Mechanical property yield strength
551MPa, tensile strength 643MPa, elongation percentage 20%, -40 DEG C of ballistic work 57J, 58J, 63J (5*10mm).
Pass through above-described embodiment, it is known that 500MPa grade steel for engineering machinery of the invention have preferable mechanical property and
Fatigue behaviour can improve the service life of engineering machinery, and also meet the subzero 40 DEG C of low-temperature flexibility demands of engineering machinery.
The Q235B common materials that perfect can be substituted yield strength on steel for engineering machinery and only have 235MPa, push metallurgical and engineering
Machinery industry product quality upgrades.
The above is only a preferred embodiment of the present invention, it should be pointed out that in the premise for the design for not departing from the present invention
Under, several deductions or replacement can also be made, these, which are deduced or substitute, is regarded as protection scope of the present invention.
Claims (6)
1. a kind of 500MPa grades of steel for engineering machinery, which is characterized in that include the ingredient of following mass percent：C：0.12~
0.23%,
Si：0.10~0.60%,
Mn：0.80~1.90%,
P：＜ 0.018%,
S：＜ 0.010%；
And it is selected from Cr：0~0.50%, Ni：0~0.60%, Mo：0~0.45%, Cu：0~0.40%, Nb：0~
0.060%, V：0~0.15%, Ti：0~0.12%, B：0~0.0030%, A1：One kind or more in 0.010~0.050%
Kind；
Surplus is Fe and inevitable impurity.
2. 500MPa grades of steel for engineering machinery according to claim 1, which is characterized in that metallographic structure is uniformly tiny
Martensite high tempering tissue.
3. a kind of manufacturing method of 500MPa grade steel for engineering machinery as described in claim 1~2 is any, which is characterized in that
Steps are as follows includes：
(1) smelting molten steel：Preparation meets into the molten steel being grouped as；
(2) it is cast into base：Molten steel is sent into conticaster whole process argon for protecting pouring, while electromagnetic agitation, 0.75~1.2m/ of pulling rate
Min obtains strand；
(3) heating strand：Strand is evenly heated 3.5~4.5 hours at 1100~1220 DEG C；
(4) it rolls：Using four roll reversing roller two-phase control rollings, roughing rolls reduction ratio and is more than 60%, roughing start rolling temperature
1070~1180 DEG C, 890~950 DEG C of two-stage start rolling temperature, 820~900 DEG C of finishing temperature obtains steel plate；
(5) control cooling：After accelerating outlet steel plate residual water purging in cold-zone clean, anti-red 650~690 DEG C of the temperature of steel plate is measured；
(6) it aligns：Steel plate is aligned, 3~6mm/m of control aligning unevenness；
(7) bead：Remove surface of steel plate iron scale；
(8) to remove iron scale steel plate be heat-treated to get.
4. the manufacturing method of 500MPa grades of steel for engineering machinery according to claim 3, which is characterized in that the step
(1) prepared composition forms satisfactory molten steel in, includes the following steps：
(1.1) molten iron pre-processes, and makes the S in molten iron：＜ 0.010%；
(1.2) converter is added in pretreated molten iron, deoxidation alloying is smelted and carried out using BOF methods, the alloy of addition is
It designs alloy in molten steel composition and matches the 90% of dosage；
(1.3) LF stoves refine 15~30min, and fine tuning alloying component makes alloying component meet the requirements, and promotes liquid steel temperature；
(1.4) RH Fruit storages 15-30 minutes, RH BOTTOM ARGON BLOWINGs rationally stir and the removal non-metallic inclusion that floats, and reduce
Nitrogen hydrogen-oxygen content；
(1.5) feeding calcium line purify molten steel, make strip MnS non-metallic inclusions become dispersion, shorten spheroidization to get.
5. the manufacturing method of 500MPa grades of steel for engineering machinery according to claim 3, which is characterized in that the step
(8) heat treatment is that steel plate is first heated to 880~920 DEG C using nitrogen protection non-oxidation roller hearth furnace in；Then to steel plate into
Row roller press type water knife quenches；High tempering processing is carried out at 550~660 DEG C again.
6. the manufacturing method of 500MPa grades of steel for engineering machinery according to claim 4, which is characterized in that the step
(1.4) nitrogen content≤38ppm of control molten steel, hydrogen content≤1.5ppm, oxygen content≤20ppm in.
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| MYPI2020006044A MY194384A (en) | 2018-05-24 | 2018-09-30 | 500mpa grade steel for construction machinery and manufacturing method thereof |
| PCT/CN2018/108992 WO2019223209A1 (en) | 2018-05-24 | 2018-09-30 | 500 mpa-grade engineering machinery steel and manufacturing method therefor |
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| Publication number | Publication date |
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| MY194384A (en) | 2022-11-30 |
| WO2019223209A1 (en) | 2019-11-28 |
| CN108531816B (en) | 2019-12-10 |
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