CN109957701A - A kind of production method of equipment furnace shell NR400ZL steel plate - Google Patents
A kind of production method of equipment furnace shell NR400ZL steel plate Download PDFInfo
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- CN109957701A CN109957701A CN201910249103.4A CN201910249103A CN109957701A CN 109957701 A CN109957701 A CN 109957701A CN 201910249103 A CN201910249103 A CN 201910249103A CN 109957701 A CN109957701 A CN 109957701A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 142
- 239000010959 steel Substances 0.000 title claims abstract description 142
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 64
- 238000005096 rolling process Methods 0.000 claims abstract description 64
- 238000009749 continuous casting Methods 0.000 claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 56
- 238000009628 steelmaking Methods 0.000 claims abstract description 34
- 239000002893 slag Substances 0.000 claims abstract description 30
- 238000007670 refining Methods 0.000 claims abstract description 24
- 238000005266 casting Methods 0.000 claims abstract description 14
- 238000000465 moulding Methods 0.000 claims abstract description 13
- 230000014759 maintenance of location Effects 0.000 claims abstract description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 80
- 229910052786 argon Inorganic materials 0.000 claims description 40
- 238000010079 rubber tapping Methods 0.000 claims description 30
- 238000002791 soaking Methods 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- 239000004411 aluminium Substances 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 239000013078 crystal Substances 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
-
- 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
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/12—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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of production method of equipment furnace shell NR400ZL steel plate, the production method includes steel-making, continuous casting, heating, rolling and heat treatment procedure.The present invention passes through to C, Si element component content is limited, by to convertor steelmaking process baking temperature of steel ladle and C content control, LF refining process white slag retention time and the control of vacuum soft blow time, using molding casting, control steel plate rolling technique and red temperature, gained steel plate has good compactness, higher intensity and good welds performance, steel plate thickness is 60~160mm, steel plate yield strength >=320MPa, tensile strength >=420MPa, elongation percentage >=24%, 0 DEG C of impact >=60J, 350 DEG C of high temperature tensile strength >=230MPa, fully meet standard and safety requirements, it is suitable for equipment shell steel demand.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of production method of equipment furnace shell NR400ZL steel plate.
Background technique
NR400ZL steel plate is novel converter furnace shell plate, elevated temperature strength with higher and creep-resistant property, by increasingly
More extensive uses, demand of the market to such steel plate are increasing.
With the enlargement of converter installation and the increase of smelting requirements, when design, is obvious compared with standard to the intensity rank of steel plate
It improves, and the thickness of steel plate is also in increase trend.With the increase of steel plate thickness, it is bound to cause the increase of production difficulty, is adopted
With traditional production method, it has been difficult to meet the market demand.
To sum up, further the production method of exploitation high-performance NR400ZL steel plate has the development of domestic converter shell steel
It is of great importance.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of production methods of equipment furnace shell NR400ZL steel plate.This hair
It is good to ensure that steel plate has for the bright control by master operation technical parameter in steel plate chemical component and production technology
Performance meets market to the requirement of equipment furnace shell NR400ZL steel plate.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of equipment furnace shell NR400ZL steel plate
Production method, the production method include steel-making, continuous casting, heating, rolling and heat treatment procedure；The continuous casting working procedure, continuous casting
15~25 DEG C of the degree of superheat, molding casting, stopper rod of tundish Argon and argon blowing sealing are used when continuous casting, argon pressure control exists
0.2~0.4MPa, argon flow control guarantee that continuous casting is made in liquid slag layer thickness after 10~15mm, continuous casting in 15~20L/min
Base；The rolling process, using II type controlled rolling, the red temperature of steel plate is 650~750 DEG C.
Steel making working procedure of the present invention, in convertor steelmaking process, baking temperature of steel ladle >=1000 DEG C, molten steel C when tapping >=
0.06%, 1560~1600 DEG C of tapping temperature, pre-deoxidation is carried out in big packet after tapping；It is good that Ar is blown in LF refining guarantee, and white slag is protected
Holding the time is 25~35min, sample aluminium content >=0.015% of skimming；VD refining terminates 5~10min of soft blow after vacuum.
Heating process of the present invention, steel billet is in continuous stove heating, and 1260 DEG C of maximum heating temperature, soaking temperature 1240~
1250℃。
Rolling process of the present invention, I 1050~1150 DEG C of stage start rolling temperature, dry in the air steel thickness >=2H, and the H is finished product
Steel plate thickness.
Rolling process of the present invention, II stage start rolling temperature≤930 DEG C, 830~860 DEG C of finishing temperature.
Heat treatment procedure of the present invention, using normalizing heat treatment technique, normalizing furnace carries out normalizing, and normalizing temperature 900~
930 DEG C, soaking time: 2.0~2.3min/mm, come out of the stove it is air-cooled after obtain equipment furnace shell NR400ZL steel plate.
Steel plate thickness of the present invention is 60~160mm.
Steel plate yield strength >=320MPa of the present invention, tensile strength >=420MPa, elongation percentage >=24%, 0 DEG C impact >=
60J, 350 DEG C of high temperature tensile strength >=230MPa.
Steel plate chemical component composition and its mass percentage of the present invention are as follows: C:0.11~0.15%, Si:0.15~
0.40%, Mn:0.90~1.30%, P≤0.020%, S≤0.010%, Nb≤0.045%, V≤0.045%, Ti≤0.020%, Mo:
0.20~0.40%, Alt:0.020~0.050%, surplus are Fe and inevitable impurity.
Process design mechanism of the present invention:
Pouring technology control aspect in steelmaking process of the present invention, the purpose of molding casting are to occur two after liquid steel refining in order to prevent
Secondary oxidative phenomena guarantees the smelting of clean steel, improves slab quality, guarantees that plate property is stablized；Two ranks are used in rolling process
Section rolling, in conjunction with the red temperature of steel grade control steel plate, hence it is evident that improve the stability of steel plate.
Two-phase control rolling principle, first stage rolling is the controlled rolling in austenite recrystallization area, mainly makes austenite crystal
The significant refinement of grain；Second stage makes equi-axed crystal become flat crystal grain in the rolling of non-recrystallization zone, and austenite crystal interfacial area is into one
Step expands, while introducing a large amount of dislocations and Zona transformans transgranular, becomes the cenotype nucleation site with Grain-Boundary Phase competition；It limits simultaneously
The red temperature of steel plate further makes even tissue tiny, hence it is evident that improves plate property stability.
The beneficial effects of adopting the technical scheme are that 1, the present invention by C, Si element component content into
Row limitation, it is ensured that armor plate strength meets design needs.2, the present invention is by convertor steelmaking process baking temperature of steel ladle and C content
Control, LF refining process white slag retention time and the control of vacuum soft blow time, ensure that steel inner clamps sundries sufficiently floats, reach
Composition Control precision and internal soundness are excellent.3, the present invention prevents generation secondary oxidation after liquid steel refining existing using molding casting
As guaranteeing the good surface quality of steel billet and internal stresses release, guaranteeing the smelting of clean steel, improve slab quality, it is ensured that steel billet
The defects of not cracking.4, this hair passes through to I, II rank start rolling temperature, finishing temperature control in rolling process, it is ensured that steel plate
Good tissue deposit, being heat-treated subsequently through normalizing further improves tissue topography, reaches steel plate requirement.5, of the invention
Steel plate have good compactness, higher intensity and good welds performance, steel plate yield strength >=320MPa, tensile strength >=
420MPa, elongation percentage >=24%, 0 DEG C impact >=60J, 350 DEG C of high temperature tensile strength >=230MPa fully meet standard and safety
It is required that being suitable for equipment shell steel demand.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
Embodiment 1
The present embodiment equipment furnace shell is 60mm with NR400ZL steel plate thickness, and chemical component composition and mass percentage are shown in Table
1。
The production method of the present embodiment equipment furnace shell NR400ZL steel plate includes at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, specific process step are as described below:
(1) steel making working procedure: in convertor steelmaking process, 1000 DEG C of baking temperature of steel ladle, molten steel C:0.06% when tapping, tapping temperature
1560 DEG C, pre-deoxidation is carried out in big packet after tapping；It is good that Ar is blown in LF refining guarantee, and the white slag retention time is 25min, takes off slag specimen
Aluminium content 0.020%；VD refining terminates soft blow 10min after vacuum；
(2) continuous casting working procedure: 25 DEG C of the continuous casting degree of superheat, molding casting is used when continuous casting, stopper rod of tundish Argon and argon blowing are close
Envelope, in 0.2MPa, argon flow control guarantees that liquid slag layer thickness is made after 10mm, continuous casting in 15L/min for argon pressure control
Continuous casting billet；
(3) heating process: steel billet is in continuous stove heating, and 1260 DEG C of maximum heating temperature, 1250 DEG C of soaking temperature；
(4) rolling process: II type controlled rolling is used, I 1050 DEG C of stage start rolling temperature, dry in the air steel thickness 150mm；The open rolling of II stage
930 DEG C of temperature, 860 DEG C of finishing temperature；The red temperature of steel plate is 650 DEG C.；
(5) heat treatment procedure: use normalizing heat treatment technique, normalizing furnace carry out normalizing, 910 DEG C of normalizing temperature, soaking time:
2.1min/mm, come out of the stove it is air-cooled after obtain equipment furnace shell NR400ZL steel plate.
The present embodiment equipment furnace shell is shown in Table 2 with the mechanical property of NR400ZL steel plate.
Embodiment 2
The present embodiment equipment furnace shell is 80mm with NR400ZL steel plate thickness, and chemical component composition and mass percentage are shown in Table
1。
The production method of the present embodiment equipment furnace shell NR400ZL steel plate includes at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, specific process step are as described below:
(1) steel making working procedure: in convertor steelmaking process, 1020 DEG C of baking temperature of steel ladle, molten steel C:0.07% when tapping, tapping temperature
1600 DEG C, pre-deoxidation is carried out in big packet after tapping；It is good that Ar is blown in LF refining guarantee, and the white slag retention time is 35min, takes off slag specimen
Aluminium content 0.015%；VD refining terminates soft blow 5min after vacuum；
(2) continuous casting working procedure: 15 DEG C of the continuous casting degree of superheat, molding casting is used when continuous casting, stopper rod of tundish Argon and argon blowing are close
Envelope, in 0.4MPa, argon flow control guarantees that liquid slag layer thickness is made after 15mm, continuous casting in 20L/min for argon pressure control
Continuous casting billet；
(3) heating process: steel billet is in continuous stove heating, and 1260 DEG C of maximum heating temperature, 1240 DEG C of soaking temperature；
(4) rolling process: II type controlled rolling is used, I 1150 DEG C of stage start rolling temperature, dry in the air steel thickness 165mm；The open rolling of II stage
920 DEG C of temperature, 830 DEG C of finishing temperature；The red temperature of steel plate is 750 DEG C.；
(5) heat treatment procedure: use normalizing heat treatment technique, normalizing furnace carry out normalizing, 900 DEG C of normalizing temperature, soaking time:
2.2min/mm, come out of the stove it is air-cooled after obtain equipment furnace shell NR400ZL steel plate.
The present embodiment equipment furnace shell is shown in Table 2 with the mechanical property of NR400ZL steel plate.
Embodiment 3
The present embodiment equipment furnace shell is 120mm with NR400ZL steel plate thickness, and chemical component composition and mass percentage are shown in Table
1。
The production method of the present embodiment equipment furnace shell NR400ZL steel plate includes at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, specific process step are as described below:
(1) steel making working procedure: in convertor steelmaking process, 1050 DEG C of baking temperature of steel ladle, molten steel C:0.08% when tapping, tapping temperature
1570 DEG C, pre-deoxidation is carried out in big packet after tapping；It is good that Ar is blown in LF refining guarantee, and the white slag retention time is 30min, takes off slag specimen
Aluminium content 0.017%；VD refining terminates soft blow 7min after vacuum；
(2) continuous casting working procedure: 20 DEG C of the continuous casting degree of superheat, molding casting is used when continuous casting, stopper rod of tundish Argon and argon blowing are close
Envelope, in 0.3MPa, argon flow control guarantees that liquid slag layer thickness is made after 12mm, continuous casting in 17L/min for argon pressure control
Continuous casting billet；
(3) heating process: steel billet is in continuous stove heating, and 1260 DEG C of maximum heating temperature, 1245 DEG C of soaking temperature；
(4) rolling process: II type controlled rolling is used, I 1100 DEG C of stage start rolling temperature, dry in the air steel thickness 260mm；The open rolling of II stage
910 DEG C of temperature, 840 DEG C of finishing temperature；The red temperature of steel plate is 660 DEG C；
(5) heat treatment procedure: use normalizing heat treatment technique, normalizing furnace carry out normalizing, 915 DEG C of normalizing temperature, soaking time:
2.0min/mm, come out of the stove it is air-cooled after obtain equipment furnace shell NR400ZL steel plate.
The present embodiment equipment furnace shell is shown in Table 2 with the mechanical property of NR400ZL steel plate.
Embodiment 4
The present embodiment equipment furnace shell is 100mm with NR400ZL steel plate thickness, and chemical component composition and mass percentage are shown in Table
1。
The production method of the present embodiment equipment furnace shell NR400ZL steel plate includes at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, specific process step are as described below:
(1) steel making working procedure: in convertor steelmaking process, 1060 DEG C of baking temperature of steel ladle, molten steel C:0.07% when tapping, tapping temperature
1580 DEG C, pre-deoxidation is carried out in big packet after tapping；It is good that Ar is blown in LF refining guarantee, and the white slag retention time is 32min, takes off slag specimen
Aluminium content 0.017%；VD refining terminates soft blow 8min after vacuum；
(2) continuous casting working procedure: 21 DEG C of the continuous casting degree of superheat, molding casting is used when continuous casting, stopper rod of tundish Argon and argon blowing are close
Envelope, in 0.35MPa, argon flow control guarantees that liquid slag layer thickness is made after 13mm, continuous casting in 16L/min for argon pressure control
At continuous casting billet；
(3) heating process: steel billet is in continuous stove heating, and 1260 DEG C of maximum heating temperature, 1247 DEG C of soaking temperature；
(4) rolling process: II type controlled rolling is used, I 1070 DEG C of stage start rolling temperature, dry in the air steel thickness 220mm；The open rolling of II stage
915 DEG C of temperature, 845 DEG C of finishing temperature；The red temperature of steel plate is 670 DEG C；
(5) heat treatment procedure: use normalizing heat treatment technique, normalizing furnace carry out normalizing, 920 DEG C of normalizing temperature, soaking time:
2.3min/mm, come out of the stove it is air-cooled after obtain equipment furnace shell NR400ZL steel plate.
The present embodiment equipment furnace shell is shown in Table 2 with the mechanical property of NR400ZL steel plate.
Embodiment 5
The present embodiment equipment furnace shell is 160mm with NR400ZL steel plate thickness, and chemical component composition and mass percentage are shown in Table
1。
The production method of the present embodiment equipment furnace shell NR400ZL steel plate includes at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, specific process step are as described below:
(1) steel making working procedure: in convertor steelmaking process, 1035 DEG C of baking temperature of steel ladle, molten steel C:0.08% when tapping, tapping temperature
1580 DEG C, pre-deoxidation is carried out in big packet after tapping；It is good that Ar is blown in LF refining guarantee, and the white slag retention time is 30min, takes off slag specimen
Aluminium content 0.018%；VD refining terminates soft blow 7min after vacuum；
(2) continuous casting working procedure: 20 DEG C of the continuous casting degree of superheat, molding casting is used when continuous casting, stopper rod of tundish Argon and argon blowing are close
Envelope, in 0.35MPa, argon flow control guarantees that liquid slag layer thickness is made after 14mm, continuous casting in 18L/min for argon pressure control
At continuous casting billet；
(3) heating process: steel billet is in continuous stove heating, and 1260 DEG C of maximum heating temperature, 1242 DEG C of soaking temperature；
(4) rolling process: II type controlled rolling is used, I 1120 DEG C of stage start rolling temperature, dry in the air steel thickness 320mm；The open rolling of II stage
925 DEG C of temperature, 855 DEG C of finishing temperature；The red temperature of steel plate is 695 DEG C；
(5) heat treatment procedure: use normalizing heat treatment technique, normalizing furnace carry out normalizing, 930 DEG C of normalizing temperature, soaking time:
2.2min/mm, come out of the stove it is air-cooled after obtain equipment furnace shell NR400ZL steel plate.
The present embodiment equipment furnace shell is shown in Table 2 with the mechanical property of NR400ZL steel plate.
Embodiment 6
The present embodiment equipment furnace shell is 140mm with NR400ZL steel plate thickness, and chemical component composition and mass percentage are shown in Table
1。
The production method of the present embodiment equipment furnace shell NR400ZL steel plate includes at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, specific process step are as described below:
(1) steel making working procedure: in convertor steelmaking process, 1030 DEG C of baking temperature of steel ladle, molten steel C:0.06% when tapping, tapping temperature
1590 DEG C, pre-deoxidation is carried out in big packet after tapping；It is good that Ar is blown in LF refining guarantee, and the white slag retention time is 28min, takes off slag specimen
Aluminium content 0.016%；VD refining terminates soft blow 9min after vacuum；
(2) continuous casting working procedure: 23 DEG C of the continuous casting degree of superheat, molding casting is used when continuous casting, stopper rod of tundish Argon and argon blowing are close
Envelope, in 0.25MPa, argon flow control guarantees that liquid slag layer thickness is made after 11mm, continuous casting in 19L/min for argon pressure control
At continuous casting billet；
(3) heating process: steel billet is in continuous stove heating, and 1260 DEG C of maximum heating temperature, 1248 DEG C of soaking temperature；
(4) rolling process: II type controlled rolling is used, I 1130 DEG C of stage start rolling temperature, dry in the air steel thickness 300mm；The open rolling of II stage
905 DEG C of temperature, 850 DEG C of finishing temperature；The red temperature of steel plate is 720 DEG C；
(5) heat treatment procedure: use normalizing heat treatment technique, normalizing furnace carry out normalizing, 905 DEG C of normalizing temperature, soaking time:
2.1min/mm, come out of the stove it is air-cooled after obtain equipment furnace shell NR400ZL steel plate.
The present embodiment equipment furnace shell is shown in Table 2 with the mechanical property of NR400ZL steel plate.
Embodiment 7
The present embodiment equipment furnace shell is 90mm with NR400ZL steel plate thickness, and chemical component composition and mass percentage are shown in Table
1。
The production method of the present embodiment equipment furnace shell NR400ZL steel plate includes at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, specific process step are as described below:
(1) steel making working procedure: in convertor steelmaking process, 1040 DEG C of baking temperature of steel ladle, molten steel C:0.08% when tapping, tapping temperature
1575 DEG C, pre-deoxidation is carried out in big packet after tapping；It is good that Ar is blown in LF refining guarantee, and the white slag retention time is 27min, takes off slag specimen
Aluminium content 0.019%；VD refining terminates soft blow 6min after vacuum；
(2) continuous casting working procedure: 18 DEG C of the continuous casting degree of superheat, molding casting is used when continuous casting, stopper rod of tundish Argon and argon blowing are close
Envelope, in 0.28MPa, argon flow control guarantees that liquid slag layer thickness is made after 15mm, continuous casting in 17L/min for argon pressure control
At continuous casting billet；
(3) heating process: steel billet is in continuous stove heating, and 1260 DEG C of maximum heating temperature, 1243 DEG C of soaking temperature；
(4) rolling process: II type controlled rolling is used, I 1090 DEG C of stage start rolling temperature, dry in the air steel thickness 180mm；The open rolling of II stage
922 DEG C of temperature, 835 DEG C of finishing temperature；The red temperature of steel plate is 725 DEG C；
(5) heat treatment procedure: use normalizing heat treatment technique, normalizing furnace carry out normalizing, 925 DEG C of normalizing temperature, soaking time:
2.3min/mm, come out of the stove it is air-cooled after obtain equipment furnace shell NR400ZL steel plate.
The present embodiment equipment furnace shell is shown in Table 2 with the mechanical property of NR400ZL steel plate.
Embodiment 8
The present embodiment equipment furnace shell is 130mm with NR400ZL steel plate thickness, and chemical component composition and mass percentage are shown in Table
1。
The production method of the present embodiment equipment furnace shell NR400ZL steel plate includes at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, specific process step are as described below:
(1) steel making working procedure: in convertor steelmaking process, 1010 DEG C of baking temperature of steel ladle, molten steel C:0.06% when tapping, tapping temperature
1595 DEG C, pre-deoxidation is carried out in big packet after tapping；It is good that Ar is blown in LF refining guarantee, and the white slag retention time is 33min, takes off slag specimen
Aluminium content 0.018%；VD refining terminates soft blow 8min after vacuum；
(2) continuous casting working procedure: 17 DEG C of the continuous casting degree of superheat, molding casting is used when continuous casting, stopper rod of tundish Argon and argon blowing are close
Envelope, in 0.32MPa, argon flow control guarantees that liquid slag layer thickness is made after 12mm, continuous casting in 19L/min for argon pressure control
At continuous casting billet；
(3) heating process: steel billet is in continuous stove heating, and 1260 DEG C of maximum heating temperature, 1246 DEG C of soaking temperature；
(4) rolling process: II type controlled rolling is used, I 1080 DEG C of stage start rolling temperature, dry in the air steel thickness 280mm；The open rolling of II stage
918 DEG C of temperature, 847 DEG C of finishing temperature；The red temperature of steel plate is 740 DEG C；
(5) heat treatment procedure: use normalizing heat treatment technique, normalizing furnace carry out normalizing, 916 DEG C of normalizing temperature, soaking time:
2.0min/mm, come out of the stove it is air-cooled after obtain equipment furnace shell NR400ZL steel plate.
The present embodiment equipment furnace shell is shown in Table 2 with the mechanical property of NR400ZL steel plate.
The chemical component of 1 embodiment 1-8 equipment furnace shell NR400ZL steel plate of table forms
And its mass percentage (%)
Ingredient surplus is Fe and inevitable impurity in table 1.
The mechanical property of 2 equipment furnace shell NR400ZL steel plate of table
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to the present invention into
Go detailed description, those skilled in the art should understand that: it can still modify to the present invention or equally replace
It changes, without departing from the spirit or scope of the invention, or any substitutions, should all cover and be wanted in right of the invention
It asks in range.
Claims (9)
1. a kind of production method of equipment furnace shell NR400ZL steel plate, which is characterized in that the production method includes steel-making, connects
Casting, heating, rolling and heat treatment procedure；15~25 DEG C of the continuous casting degree of superheat, molding casting is used when continuous casting for the continuous casting working procedure,
Stopper rod of tundish Argon and argon blowing sealing, argon pressure control are controlled in 0.2~0.4MPa, argon flow in 15~20L/
Min guarantees that continuous casting billet is made in liquid slag layer thickness after 10~15mm, continuous casting；The rolling process, using II type controlled rolling,
The red temperature of steel plate is 650~750 DEG C.
2. a kind of production method of equipment furnace shell NR400ZL steel plate according to claim 1, which is characterized in that described
Steel making working procedure, in convertor steelmaking process, baking temperature of steel ladle >=1000 DEG C, molten steel C >=0.06% when tapping, tapping temperature 1560
~1600 DEG C, pre-deoxidation is carried out in big packet after tapping；It is good that Ar is blown in LF refining guarantee, and the white slag retention time is 25~35min,
It skims sample aluminium content >=0.015%；VD refining terminates 5~10min of soft blow after vacuum.
3. a kind of production method of equipment furnace shell NR400ZL steel plate according to claim 1, which is characterized in that described
Heating process, steel billet is in continuous stove heating, and 1260 DEG C of maximum heating temperature, 1240~1250 DEG C of soaking temperature.
4. a kind of production method of equipment furnace shell NR400ZL steel plate according to claim 1, which is characterized in that described
Rolling process, I 1050~1150 DEG C of stage start rolling temperature, dry in the air steel thickness >=2H, and the H is finished steel plate thickness.
5. a kind of production method of equipment furnace shell NR400ZL steel plate according to claim 1, which is characterized in that described
Rolling process, II stage start rolling temperature≤930 DEG C, 830~860 DEG C of finishing temperature.
6. a kind of production method of equipment furnace shell NR400ZL steel plate according to claim 1, which is characterized in that described
Heat treatment procedure, using normalizing heat treatment technique, normalizing furnace carries out normalizing, and 900~930 DEG C of normalizing temperature, soaking time: 2.0
~2.3min/mm, come out of the stove it is air-cooled after obtain equipment furnace shell NR400ZL steel plate.
7. production method of a kind of equipment furnace shell described in -6 any one with NR400ZL steel plate according to claim 1, feature
It is, the steel plate thickness is 60~160mm.
8. production method of a kind of equipment furnace shell described in -6 any one with NR400ZL steel plate according to claim 1, feature
It is, the steel plate yield strength >=320MPa, tensile strength >=420MPa, elongation percentage >=24%, 0 DEG C ballistic work >=60J, 350
DEG C high temperature tensile strength >=230MPa.
9. production method of a kind of equipment furnace shell described in -6 any one with NR400ZL steel plate according to claim 1, feature
It is, the steel plate chemical component composition and its mass percentage are as follows: C:0.11~0.15%, Si:0.15~0.40%, Mn:
0.90~1.30%, P≤0.020%, S≤0.010%, Nb≤0.045%, V≤0.045%, Ti≤0.020%, Mo:0.20~
0.40%, Alt:0.020~0.050%, surplus are Fe and inevitable impurity.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111020351A (en) * | 2019-12-12 | 2020-04-17 | 舞阳钢铁有限责任公司 | Low-carbon steel plate with excellent low-temperature impact toughness and welding performance and production method thereof |
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