CN102703803A - Globular pearlite type hot rolled coil and production method thereof - Google Patents
Globular pearlite type hot rolled coil and production method thereof Download PDFInfo
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- CN102703803A CN102703803A CN2012101294643A CN201210129464A CN102703803A CN 102703803 A CN102703803 A CN 102703803A CN 2012101294643 A CN2012101294643 A CN 2012101294643A CN 201210129464 A CN201210129464 A CN 201210129464A CN 102703803 A CN102703803 A CN 102703803A
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- 229910001562 pearlite Inorganic materials 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000005096 rolling process Methods 0.000 claims abstract description 17
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims description 21
- 238000005098 hot rolling Methods 0.000 claims description 9
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 241001062472 Stokellia anisodon Species 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000004484 Briquette Substances 0.000 claims description 2
- 238000000137 annealing Methods 0.000 abstract description 32
- 229910000831 Steel Inorganic materials 0.000 description 35
- 239000010959 steel Substances 0.000 description 35
- 229910000677 High-carbon steel Inorganic materials 0.000 description 8
- 229910001561 spheroidite Inorganic materials 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000011651 chromium Substances 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 235000019362 perlite Nutrition 0.000 description 7
- 239000010451 perlite Substances 0.000 description 7
- 230000009466 transformation Effects 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 238000005097 cold rolling Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 239000011572 manganese Substances 0.000 description 6
- 241000186216 Corynebacterium Species 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 5
- 229910001567 cementite Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 4
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 229910052748 manganese Inorganic materials 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
Disclosed are a globular pearlite type hot rolled coil and a production method thereof. The globular pearlite type hot rolled coil comprises, by weight, 0.30-0.77% of C, 0.10-2.0% of Mn, 0.05-0.50% of Si, not more than 0.01% of S, not more than 0.02% of P, more than one of Cr, Ni and Mo, the balance of Fe and unavoidable impurities, wherein the Cr is not more than 1.5%, the Ni is not more than 1.0%, and the Mo is not more than 0.50%. Globular and rod-like pearlite more than 80% can be obtained by common rolling process and coiling process, extra annealing equipment is not needed, and the production method is energy-saving and environment-friendly.
Description
Technical field
The present invention relates to hot-rolled coil and working method thereof, particularly a kind of globular pearlite type hot-rolled coil and working method thereof.
Background technology
Carbon content is at medium and high carbon steel more than 0.30% or steel alloy; The tissue of hot-rolled steel sheet is generally ferritic and pearlitic structure, because the perlite of sheet exists, makes the punching performance of steel plate descend; Under the common situation; Must carry out Spheroidizing Annealing to the perlite of sheet earlier and handle, obtain globular pearlite, thereby make steel plate have good plasticity and punching performance.
The purpose of Spheroidizing Annealing is slowly assembled the process of growing up after being to make the dissolving of sheet perlite again, and time that insulation, and Spheroidizing Annealing for a long time is required and perlite form and the quantity under temperature and the hot-rolled state have confidential relation.
A kind of manufacturing of cold rolling feeds is disclosed like Japanese Patent JP2003183775A; C content is 0.05～0.40%; Being cooled to 500 ℃ with the cooling rate greater than 30 ℃/s after the hot rolling batches; Roll postcooling speed through control and control and roll the attitude tissue, steel plate is reheated to 550～700 ℃ carry out Spheroidizing Annealing then, obtain equally distributed spheroidite.
Japanese Patent JP2000045029A; This patent is the method for manufacturing of the high carbon steel of a kind of high ductibility, high hardenability; More than Ar3, accomplish rolling after the roughing; Steel plate is through obtaining the spheroidite greater than 80% after the spheroidizing, carry out again deflection greater than 30% cold rolling, the long-width ratio that annealing obtains cementite crystal grain between 600～Ac1 less than 1.5 with long-width ratio≤1.3 of ferrite crystal grain.This technology has obtained the ideal globular structure through twice Spheroidizing Annealing.
Except above-mentioned publication, Japanese Patent JP11061272A, JP08120405A, JP59205417A, JP59013024A have set forth and need pass through the off-line carbide annealing process from different technology point of view.
Summary of the invention
The object of the present invention is to provide a kind of globular pearlite type hot-rolled coil and working method thereof; Utilize common rolling technology and coiling technique just can obtain the spherical and corynebacterium pearlitic structure more than 80%; Need not additional annealing equipment, be a kind of energy saving and environment friendly production technique.
For achieving the above object, technical scheme of the present invention is:
A kind of globular pearlite type hot-rolled coil, its chemical component weight per-cent is: C0.30～0.77%, Mn0.10～2.0%, Si0.05～0.50%; S≤0.01%, P≤0.02%, V≤0.50%; B≤0.010% also comprises among Cr, Ni, the Mo more than one, Cr≤1.5%; Ni≤1.0%, Mo≤0.50%, all the other are Fe and inevitable impurity.
Further, also comprise and contain among V, the B more than one, V≤0.50%, B≤0.010%, weight percent meter.
In composition of steel design of the present invention:
C: be strengthening element most economical, the most basic in the steel, the intensity that improves steel had obvious effect, plasticity, toughness and the weldableness of steel had negative impact but improve C content through solution strengthening and precipitation strength.In order to obtain a certain proportion of perlite, carbon content is selected the higher part of carbon content in the hypoeutectoid steel, and scope is 0.30～0.77%.
Si: silicon is little to the stability influence of supercooled austenite.Silicon plays the solution strengthening effect in steel, and content can suppress separating out of carbide, raising toughness more for a long time.Add silicon in the steel and can improve purity of steel and play desoxydatoin, scope is 0.05～0.50%.
Mn: manganese improves stabilization of austenite and reduces the austenite phase transformation temperature, and manganese is weak carbide forming element, in steel, mainly plays the solution strengthening effect, helps improving the austenitic transformation tissue intensity.Manganese in the steel is easy to combine to form MnS with sulphur, avoids occurring in the steel low temperature phase FeS, prevents to occur in the course of hot rolling decrepitation, span of the present invention: 0.10～2.0%.
S and P: sulphur forms the plastic occluded foreignsubstance manganese sulfide with chemical combination such as manganese in steel, along rolling direction tensile deformation, especially unfavorable to the horizontal plastic property and the toughness of steel in the operation of rolling.Therefore the content of sulphur should be low as much as possible.Phosphorus also is the harmful element in the steel, the plasticity of heavy damage steel plate and toughness.Reduce sulphur, phosphorus content during smelting as far as possible, improve the steel purity.
Cr and Mo: chromium mainly is used for postponing the austenitic transformation incubation time in steel, improves hardening capacity, moves after making ferritic, perlitic transformation, in process of cooling, suppresses such tissue and forms, and makes steel direct entering martensitic transformation district under the not high situation of cooling rate.Molybdenum is the element that in the every other alloying element hardening capacity is had the greatest impact, and significantly postpones perlitic transformation.
Ni: the nickel solid solution is significantly improved the toughness of matrix in ferritic.
B: add the stability that boron can significantly improve supercooled austenite in the steel in right amount, but along with the increase of carbon content, the effect of boron reduces gradually.
The working method of globular pearlite type hot-rolled coil of the present invention comprises the steps:
A) smelt, cast
Hot-rolled coil chemical component weight per-cent is: C0.30～0.77%, Mn0.10～2.0%, Si0.05～0.50%, S≤0.01%; P≤0.02% also comprises among Cr, Ni, the Mo more than one, Cr≤1.5%; Ni≤1.0%, Mo≤0.50%, all the other are Fe and inevitable impurity; Smelt, be cast as slab by mentioned component;
B) hot rolling
The slab heating, board briquette: 1100～1300 ℃; Finish rolling final temperature: 800～950 ℃;
C) laminar flow cooling
Take the laminar flow cooling, cooling rate is 10～25 ℃/s, and final cooling temperature is 600～750 ℃;
D) batch
Coiling temperature: 600～750 ℃;
E) finished product coil of strip cooling
Take slow refrigerative mode to cool off after batching completion, average cooling rate is lower than 50 ℃/hour.
Also comprise in the described hot-rolled coil composition and contain among V, the B more than one, V≤0.50%, B≤0.010%, weight percent meter again.
The medium high carbon hot-rolled sheet coil that the present invention produces through roughing mill+hot continuous rolling unit with continuously cast bloom; Its microstructure is ferritic and pearlitic structure, and its Medium pearlite is spherical or the corynebacterium form, and proportion is higher than 80%; When needing Spheroidizing Annealing like following process; Compare with the sheet pearlitic structure with traditional ferritic, when carrying out Spheroidizing Annealing, can greatly shorten soaking time, thereby the efficient of Spheroidizing Annealing operation is improved greatly.
Medium and high carbon steel is because lower processability, is shaped and adds man-hour carrying out complicacy, need carry out Spheroidizing Annealing in advance and handle, and purpose is to make the perlite of sheet to change into globular pearlite, the raising processing characteristics.Tradition medium high carbon hot-rolled coil be organized as ferritic and sheet pearlitic structure; Need insulation for a long time to guarantee to have higher nodularization rate; The hot-rolled sheet coil that the present invention produces can obtain the globular pearlite more than 80%; When needing the off-line Spheroidizing Annealing to handle like following process, owing to contained the globular pearlite of higher proportion, so the required Spheroidizing Annealing time greatly reduces.The ultimate principle of Spheroidizing Annealing is: the two-phase region that steel grade is heated to austenite and ferritic coexistence; Making cementite that part take place dissolves disconnected; In process of cooling, form the carbide core and progressively assemble nodularization subsequently, obtain the globular pearlite tissue at undissolved carbide particle and local high-carbon regions.Because hot-rolled coil is from great; Batch between the steel plate closely, need long insulation just can obtain uniform tissue, when hot rolling attitude most tissues is globular pearlite; Under the situation that shortens soaking time, still can obtain higher nodularization rate, thereby improve the production efficiency of Spheroidizing Annealing.
The medium and high carbon steel of the present invention's design is hot rolling special steel commonly used, and intensity rank broad covered area after the thermal treatment can be widely used in all trades and professions.Realization of the present invention is based on the control to hot rolling, process for cooling, utilizes common rolling technology and coiling technique just can satisfy and organizes requirement, need not additional annealing equipment, is a kind of energy saving and environment friendly production technique.
The present invention compared with prior art has following difference:
Japanese Patent JP2003183775A; This patent relates to a kind of manufacturing of cold rolling feeds, and C content is 0.05～0.40%, is cooled to 500 ℃ with the cooling rate greater than 30 ℃/s after the hot rolling and batches; Reheat to 550～700 ℃ and carry out Spheroidizing Annealing, obtain equally distributed spheroidite.The present invention need not reheat and carry out Spheroidizing Annealing, can obtain globular pearlite batching to accomplish to be cooled in the room temperature process, so both processing routes are different.
Japanese Patent JP2000045029A; This patent is the method for manufacturing of the high carbon steel of a kind of high ductibility, high hardenability; More than Ar3, accomplish rolling after the roughing; Steel plate is through obtaining the spheroidite greater than 80% after the spheroidizing, carry out again deflection greater than 30% cold rolling, the long-width ratio that annealing obtains cementite crystal grain between 600～Ac1 less than 1.5 with long-width ratio≤1.3 of ferrite crystal grain.Compare with the present invention, technology has more different, and the present invention adopts the technology of batching postcooling to obtain a certain proportion of spheroidite, does not need to carry out specially Spheroidizing Annealing.
Japanese Patent JP08120405A, high carbon steel and production technique thereof that this patent is a kind of reaming performance, suitability for secondary processing is good.Between 750～900 ℃, accomplish rollingly, batch 600～720 ℃ of annealing between 400～650 ℃.Different with technology of the present invention, its mode that obtains spheroidite is off-line annealing.
Japanese Patent JP59205417A, this patent is a kind of production of medium and high carbon steel of globular structure, and the acquisition of its globular structure is to be incubated to Ac1 or following temperature through the heating steel plate, and slowly cooling obtains then, and the technology that obtains spherical smooth body with the present invention is different.
Japanese Patent JP59013024A; This patent is a kind of steel method of manufacture of direct spheroidizing; This patent requires 50 ℃ of drafts that carry out more than 30% below Ar1 to Ar1, reheats then between Ac1～Ac3 and batches, and slowly cooling makes pearlitic spheroidization.The present invention need not reheat, so the thinking of Spheroidizing Annealing is different.
Also just like Japanese Patent JP2000045029A; This patent is the method for manufacturing of the high carbon steel of a kind of high ductibility, high hardenability; More than Ar3, accomplish rolling after the roughing; Steel plate is through obtaining the spheroidite greater than 80% after the spheroidizing, carry out again deflection greater than 30% cold rolling, the long-width ratio that annealing obtains cementite crystal grain between 600～Ac1 less than 1.5 with long-width ratio≤1.3 of ferrite crystal grain.Compare with the present invention, technology has more different, and the present invention adopts the technology of batching postcooling to obtain a certain proportion of spheroidite, does not need to carry out specially Spheroidizing Annealing.
Beneficial effect of the present invention
The present invention utilizes hot continuous rolling to produce line and manufactures ferritic and globular pearlite type hot-rolled sheet coil; Substitute traditional Spheroidizing Annealing and obtain the technology that globular pearlite need reheat; Can obtain the spherical and corynebacterium perlite more than 80%; This is organized in when carrying out Spheroidizing Annealing, can shorten the Spheroidizing Annealing time, enhances productivity.
Description of drawings
Fig. 1 is the metallographic structure of the embodiment of the invention 2.
Fig. 2 is the metallographic structure of the embodiment of the invention 8.
Embodiment
Below just and embodiment the present invention is further specified.
Embodiment of the invention smelting component is as shown in table 1.
Table 1 embodiment chemical ingredients, wt%
| Embodiment | C | Si | Mn | P | S | Cr | Ni | Mo | B | V |
| 1 | 0.30 | 0.25 | 0.10 | 0.010 | 0.005 | 1.50 | 0.15 | 0.10 | -- | -- |
| 2 | 0.32 | 0.05 | 1.35 | 0.010 | 0.002 | 0.10 | -- | -- | 0.0015 | -- |
| 3 | 0.35 | 0.27 | 2.00 | 0.011 | 0.005 | -- | 0.56 | 0.26 | 0.0020 | -- |
| 4 | 0.41 | 0.25 | 0.78 | 0.010 | 0.003 | -- | -- | 0.20 | 0.01 | -- |
| 5 | 0.50 | 0.20 | 1.55 | 0.009 | 0.003 | 0.22 | -- | -- | -- | 0.50 |
| 6 | 0.55 | 0.50 | 0.68 | 0.007 | 0.003 | -- | 1.0 | -- | -- | -- |
[0049]?
| 7 | 0.65 | 0.35 | 1.10 | 0.008 | 0.006 | -- | -- | 0.50- | -- | -- |
| 8 | 0.67 | 0.25 | 0.65 | 0.010 | 0.002 | -- | 0.03 | ? | -- | -- |
| 9 | 0.75 | 0.25 | 0.70 | 0.013 | 0.005 | 0.50 | -- | -- | -- | -- |
| 10 | 0.77 | 0.30 | 0.75 | 0.008 | 0.002 | 0.02 | -- | -- | -- | 0.12 |
Mentioned component embodiment carries out hot rolling, sotck thinkness 250mm, and 1100～1300 ℃ of blank soaking temperatures guarantee that the blank center grills thoroughly and be incubated chien shih homogeneous microstructureization when enough.It is rolling immediately after the blank insulation finishes; Be rolled to finished product thickness continuously through multi-pass; Embodiment hot-rolled sheet finished product thickness 2～10mm, control finishing temperature scope is 800～950 ℃ when rolling, steel plate is sprayed water immediately and is cooled to the perlitic transformation zone after the rolling completion; Treat to batch when temperature is reduced to 600～750 ℃, take the mode of slow cooling to be cooled to room temperature after batching.
Rolling and the process for cooling of embodiment is as shown in table 2.
Table 2
Can find out that from Fig. 1, Fig. 2 hot rolled strip of the present invention, its structural state are ferritic and pearlitic structure; Its Medium pearlite major part is spherical and distributes with corynebacterium; The long-width ratio of corynebacterium cementite is less than 5:1, and both proportions are sheet on a small quantity and distribute greater than 80%.
Compare with the sheet perlite with the ferritic that hypoeutectoid steel had of traditional normalizing rolling; This type tissue can reduce the Spheroidizing Annealing soaking time of steel grade significantly, and nodularization effect and traditional technology produce the same, all have higher nodularization rate; Adopt the hot rolled strip of this explained hereafter; Be suitable for further processing, especially can shorten the Spheroidizing Annealing time, improve the production efficiency of cold rolling special steel band.
Claims (4)
1. globular pearlite type hot-rolled coil, its chemical component weight per-cent is: C0.30～0.77%, Mn0.10～2.0%; Si0.05～0.50%, S≤0.01%, P≤0.02%; Also comprise among Cr, Ni, the Mo more than one, Cr≤1.5%, Ni≤1.0%; Mo≤0.50%, all the other are Fe and inevitable impurity.
2. globular pearlite type hot-rolled coil as claimed in claim 1 is characterized in that, also comprises containing among V, the B more than one, V≤0.50%, B≤0.010%, weight percent meter.
3. the working method of a globular pearlite type hot-rolled coil comprises the steps:
A) smelt, cast
Hot-rolled coil chemical component weight per-cent is: C0.30～0.77%, Mn0.10～2.0%, Si0.05～0.50%, S≤0.01%; P≤0.02% also comprises among Cr, Ni, the Mo more than one, Cr≤1.5%; Ni≤1.0%, Mo≤0.50%, all the other are Fe and inevitable impurity; Smelt, be cast as slab by mentioned component;
B) hot rolling
The slab heating, board briquette: 1100～1300 ℃, 950～1050 ℃ of roughing temperature, finish rolling final temperature: 800～950 ℃;
C) laminar flow cooling
Take the laminar flow cooling, cooling rate is 10～25 ℃/s, and final cooling temperature is 600～750 ℃;
D) batch
Coiling temperature: 600～750 ℃;
E) finished product coil of strip cooling
Take slow refrigerative mode to cool off after batching completion, average cooling rate is lower than 50 ℃/hour.
4. the working method of globular pearlite type hot-rolled coil as claimed in claim 3 is characterized in that, also comprises in the described hot-rolled coil composition containing among V, the B more than one, V≤0.50%, B≤0.010%, weight percent meter.
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| CN106048415B (en) * | 2016-07-06 | 2018-05-22 | 山东钢铁股份有限公司 | A kind of Ni microalloyings stone oil drill collar steel and preparation method thereof |
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