CN109457097A - A kind of production method of think gauge high-strength steel plate - Google Patents
A kind of production method of think gauge high-strength steel plate Download PDFInfo
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- CN109457097A CN109457097A CN201811511138.2A CN201811511138A CN109457097A CN 109457097 A CN109457097 A CN 109457097A CN 201811511138 A CN201811511138 A CN 201811511138A CN 109457097 A CN109457097 A CN 109457097A
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- 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
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- 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
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
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- 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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- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- 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
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- 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
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- 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
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- 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
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Abstract
The invention discloses a kind of production method of think gauge high-strength steel plate, the production method includes converter smelting, LF refining, RH refining, continuous casting, heating, roughing de-scaling, roughing, finish rolling de-scaling, finish rolling, cooling and slow cooling operation；RH refines vacuum degree≤120KPa, retention time >=8min；Using under weight and electromagnetic agitation when continuous casting, 15~30mm of drafts under weight, electromagnetic agitation electric current >=440A；Roughing single pass reduction ratio 15~25%, total reduction 50~70%, 1000~1200 DEG C of start rolling temperature；850~930 DEG C of finish rolling start rolling temperature, 750~850 DEG C of finishing temperature, finish rolling single pass reduction ratio 8~20%, total reduction 30~50%.The present invention not only alleviates the problem of high-alloy steel Inner Quality of Billet defect, but also solves the problems, such as that high strength steel plate think gauge product is unable to satisfy comprehensive mechanical property requirement in low compression ratio.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of production method of think gauge high-strength steel plate.
Background technique
In production process at this stage, especially in think gauge production process of plate, it is relatively low compression ratio generally occur,
The difficulties such as the hardening phase constitution generation of plate core can not be alleviated, grain structure is coarse, performance indicator is relatively low.Generally believe increase plate
Material compression ratio technique is to alleviate the serious best process means of plate center segregation tissue；Compression ratio is less than the usual nothing of 3 plate
Method effectively makes up tissue defects in steelmaking process, and subsequent technique can only carry out performance redemption by heat treatment process；But
It is incident is that the production cost increases, the problems such as quality is difficult to ensure in production cycle multiplication, heat treatment process.
The technical process of thick steel plates production at present are as follows: conventional continuous casting-heating stove heating-conventional plate blank
Rolling-cooling-heat treatment.Due to the defect problem of continuous casting billet structure, the product that pair rolling is completed will appear the centre of product
The element segregations such as site tissue C, Mn can not be alleviated to cause largely to harden phase constitution and be formed, and the performance that plate greatly reduces refers to
Mark, reduce sheet fabrication usability, it sometimes appear that due to product core structure defect can not " soldering ", plasticity is poor and sends out
Raw seminess.The existing method for reducing unqualified plate is but the heat treatment process using plate tempering or normalizing process
Increase simultaneously also along with the production cost increases, the production cycle lengthens, and the uniformity of product thickness directional performance is bad.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of production methods of think gauge high-strength steel plate.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of life of think gauge high-strength steel plate
Production method, the production method include that converter smelting, LF refining, RH refining, continuous casting, heating, roughing de-scaling, roughing, finish rolling remove
Squama, finish rolling, cooling and slow cooling operation；The RH refining procedure, supplies remaining alloy in RH refining process, adjustment molten steel chemistry at
Divide to target zone, vacuum degree≤120KPa, vacuum retention time >=8min；The continuous casting working procedure, using under weight when continuous casting
And electromagnetic agitation, drafts is 15~30mm, electromagnetic agitation electric current >=440A under weight；The roughing operation, single pass pressure
Rate be 15~25%, total reduction be 50~70%, 1000~1200 DEG C of start rolling temperature；The finishing rolling step, finish rolling start rolling temperature
850~930 DEG C, 750~850 DEG C of finishing temperature, finish rolling single pass reduction ratio 8~20%, total reduction 30~50%；It is described slow
Cooling working procedure is concentrated after aligning and stacks slow cooling, and slow cooling temperature >=300 DEG C, slow cooling time >=48h are stacked.
Converter smelting process of the present invention, 0.08~0.25%, temperature is controlled 1655 the control of converter smelting endpoint carbon
~1685 DEG C, the top of the slag of slag-stopping tapping is with a thickness of 60~80mm.
LF refining process of the present invention, LF refining feeding 30~45 ㎏/t steel aluminium calcium line, soft blow argon flow 40~
60NL/min, 8~15min of soft blow time；
Heating process of the present invention, slab heating temperature are 1100~1250 DEG C, 2.5~5.0h of heating time, heat back plate
Base is without obvious blackspot, the temperature difference≤50 DEG C in elongated direction, base wide direction, so that heating of plate blank is uniform.
Roughing de-scaling process of the present invention, de-scaling before roughing, de-scaling water pressure >=18MPa.
Finish rolling de-scaling process of the present invention, de-scaling before finish rolling, de-scaling water pressure >=18MPa.
Cooling process of the present invention, final cooling temperature is at 500~700 DEG C；It is aligned after cooling, straightening temperature >=400
℃。
The high-strength steel plate thickness specification of production method of the present invention production is 80~120mm, compression ratio is 2.2~
3.2。
The think gauge high-strength steel sheet mechanical property of production method production of the present invention are as follows: yield strength 460~
530MPa, 630~720MPa of tensile strength, elongation percentage 18~28%, ballistic work: 120~300J.
Production method of the present invention is suitble to steel grade to be Q460C/D.
Present inventive concept are as follows:
Increase RH vacuum outgas first with refining procedure, it is possible to reduce gas is influenced in terms of plate property in steel；Continuous casting
Stage external uniform big pressure effect since casting blank shell is received before complete solidification, it is therefore prevented that the negative of generation is shunk in slab condensation
Pressure, the molten steel lateral flow for preventing slab to generate because condensation is shunk or bulge, promotes slab central area rich in impurity member
The molten steel of element returns and may be in solid-liquid accelerated trip, so that solidification end is finer and close, it is inclined that this significantly reduces center
The degree of analysis and center porosity.Apply mechanical energy at casting blank solidification position by way of heavy reduction simultaneously, makes the position
Paste molten steel excludes, and destroys column polycrystalline growing, makes broken column crystal as the core of equiax crystal, so that slab center
Position is fine and close and segregation-free.The electromagnetic force generated simultaneously by electromagnetic agitation improves the degree of superheat for eliminating molten steel in mold, can
The equiaxial crystal ratio for improving slab, obtains the slab with good solidified structure, so as to improve end properties.
Rolled piece is when being rolled, in addition to dynamic recrystallization occurs to deformed microstructure and plays certain inhibiting effect, in Ovshinsky
When body recrystallization zone deforms, the high dislocation density structure obtained by accumulated deformation will provide more forming core cores for phase transformation, and
And the generation of the interface coker of machining state is more flexible, the driving force of phase transformation is also bigger.Therefore, it would be even more beneficial to obtain
Even fine grained texture, to effectively improve the intensity and low-temperature flexibility of product.
Think gauge high-strength steel plate product standard and properties of product detection method standard of the present invention refers to GB/T1591.
It is taken off in refining stage using vacuum the beneficial effects of adopting the technical scheme are that the 1, present invention passes through
Gas, continuous casting stage finish slow cooling cooling using large deformation system and rolling using weight Reduction Technology, the operation of rolling, can get inherence
High-strength steel plate high-quality, for high-quality deep processing.2, the present invention simplifies heat treatment etc. after rolling compared with traditional handicraft
Processing step, substantially reduces the production time, and section has dropped energy consumption, improved economic benefit.3, the present invention combines Heavy Plate Production
Line RH refining, under continuous casting weight, the equipment feature such as electromagnetic agitation, by milling train group large deformation rolling and the cooling of layer cool equipment and
Steel plate slow cooling after aligning, so that think gauge high-strength steel plate property meets national standard.4, the present invention alleviates high alloy
It the problem of steel Inner Quality of Billet defect, solves the problems such as too long production cycle, serious waste of resources, reduces and do not conform to panel
Material improves think gauge high strength steel plate product comprehensive mechanical property, solves high strength steel plate think gauge product in low compression ratio feelings
The problem of comprehensive mechanical property requirement is unable to satisfy under condition.
Specific embodiment
Present invention will be explained in further detail combined with specific embodiments below.
Embodiment 1
The present embodiment think gauge high-strength steel plate steel grade is Q460C, with a thickness of 80mm, and chemical component composition and quality percentage contain
Amount are as follows: C:0.15%, Mn:1.7%, Si:0.17%, V:0.06%, Ti:0.2%, Nb:0.04%, Al:0.05%, S:0.005%, P:
0.015%, surplus is Fe and inevitable impurity.
The present embodiment think gauge high-strength steel sheet production method include converter smelting, LF refining, RH refining, continuous casting, heating,
Roughing de-scaling, roughing, finish rolling de-scaling, finish rolling, cooling and slow cooling operation, specific process step are as described below:
(1) converter smelting process: the control of converter smelting endpoint carbon is 0.18%, and temperature control is 1655 DEG C, the top of the slag of slag-stopping tapping
With a thickness of 60mm；
(2) LF refining process: LF refining feeds 33 ㎏/t steel aluminium calcium line, and soft blow argon flow is 40NL/min, soft blow time
For 10min；
(3) remaining alloy, adjustment ladle chemistry to target zone, vacuum degree RH refining procedure: are supplied in RH refining process
120KPa, vacuum retention time are 8min；
(4) continuous casting working procedure: using when continuous casting under weight and electromagnetic agitation, and drafts is 15mm, electromagnetic agitation electric current under weight
440A obtains 250mm*2100mm steel billet；
(5) heating process: slab heating temperature is 1100 DEG C, heating time 2.7h, and slab is without obvious blackspot after heating, logical
The temperature difference is 20 DEG C on length direction, base wide direction；
(6) roughing de-scaling process: de-scaling before roughing, de-scaling water pressure are 20MPa；
(7) roughing operation: single pass reduction ratio is 17%, total reduction 58%, and start rolling temperature is 1000 DEG C；
(8) finish rolling de-scaling process: de-scaling before finish rolling, de-scaling water pressure 22MPa；
(9) finishing rolling step: finish rolling start rolling temperature is 860 DEG C, and finishing temperature is 810 DEG C, and finish rolling single pass reduction ratio is 12%, always
Reduction ratio is 34%；
(10) cooling process: final cooling temperature is 610 DEG C, is aligned after cooling, and straightening temperature is 450 DEG C；
(11) slow cooling operation: concentrating after aligning and stack slow cooling, stacks 320 DEG C of slow cooling temperature, slow cooling time 50h.
The mechanical property of the present embodiment think gauge high-strength steel plate are as follows: yield strength 478MPa, tensile strength 660MPa prolong
Stretch rate 21%, ballistic work (0 DEG C): 126J, 145J, 187J.
Embodiment 2
The present embodiment think gauge high-strength steel plate steel grade is Q460D, with a thickness of 85mm, and chemical component composition and quality percentage contain
Amount are as follows: C:0.09%, Mn:1.6%, Si:0.17%, Al:0.03%, V:0.06%, Ti:0.2%, Nb:0.04%, S:0.003%, P:
0.018%, Cr:0.15%, surplus are Fe and inevitable impurity.
The present embodiment think gauge high-strength steel sheet production method include converter smelting, LF refining, RH refining, continuous casting, heating,
Roughing de-scaling, roughing, finish rolling de-scaling, finish rolling, cooling and slow cooling operation, specific process step are as described below:
(1) converter smelting process: the control of converter smelting endpoint carbon is 0.15%, and temperature control is 1665 DEG C, the top of the slag of slag-stopping tapping
With a thickness of 80mm；
(2) LF refining process: LF refining feeds 35 ㎏/t steel aluminium calcium line, and soft blow argon flow is 60NL/min, soft blow time
For 15min；
(3) remaining alloy, adjustment ladle chemistry to target zone, vacuum degree RH refining procedure: are supplied in RH refining process
100KPa, vacuum retention time are 9min；
(4) continuous casting working procedure: using when continuous casting under weight and electromagnetic agitation, and drafts is 30mm, electromagnetic agitation electric current under weight
470A obtains 220mm*1600mm steel billet；
(5) heating process: slab heating temperature is 1220 DEG C, heating time 2.9h, and slab is without obvious blackspot after heating, logical
The temperature difference is 25 DEG C on length direction, base wide direction；
(6) roughing de-scaling process: de-scaling before roughing, de-scaling water pressure are 18MPa；
(7) roughing operation: single pass reduction ratio is 15%, total reduction 52%, and start rolling temperature is 1120 DEG C；
(8) finish rolling de-scaling process: de-scaling before finish rolling, de-scaling water pressure are 20MPa；
(9) finishing rolling step: finish rolling start rolling temperature is 880 DEG C, and finishing temperature is 800 DEG C, and finish rolling single pass reduction ratio is 10%, always
Reduction ratio is 30%；
(10) cooling process: final cooling temperature is 560 DEG C, is aligned after cooling, and straightening temperature is 435 DEG C；
(11) slow cooling operation: concentrating after aligning and stack slow cooling, stacks 328 DEG C of slow cooling temperature, slow cooling time 60h.
The mechanical property of the present embodiment think gauge high-strength steel plate are as follows: yield strength 486MPa, tensile strength 707MPa prolong
Stretch rate 18%, ballistic work (- 20 DEG C): 183J, 155J, 171J.
Embodiment 3
The present embodiment think gauge high-strength steel plate steel grade is Q460D, with a thickness of 100mm, chemical component composition and quality percentage
Content are as follows: C:0.10%, Mn:1.90%, Si:0.25%, Al:0.025%, V:0.06%, Ti:0.2%, Nb:0.04%, Mo:0.15%,
S:0.013%, P:0.026%, surplus are Fe and inevitable impurity.
The present embodiment think gauge high-strength steel sheet production method include converter smelting, LF refining, RH refining, continuous casting, heating,
Roughing de-scaling, roughing, finish rolling de-scaling, finish rolling, cooling and slow cooling operation, specific process step are as described below:
(1) converter smelting process: the control of converter smelting endpoint carbon is 0.12%, and temperature control is 1675 DEG C, the top of the slag of slag-stopping tapping
With a thickness of 70mm；
(2) LF refining process: LF refining feeds 38 ㎏/t steel aluminium calcium line, and soft blow argon flow is 50NL/min, soft blow time
For 13min；
(3) remaining alloy, adjustment ladle chemistry to target zone, vacuum degree RH refining procedure: are supplied in RH refining process
105KPa, vacuum retention time are 12min；
(4) continuous casting working procedure: using when continuous casting under weight and electromagnetic agitation, and drafts is 30mm, electromagnetic agitation electric current under weight
450A obtains 220mm*1600mm steel billet；
(5) heating process: slab heating temperature is 1100 DEG C, heating time 3.2h, and slab is without obvious blackspot after heating, logical
The temperature difference is 32 DEG C on length direction, base wide direction；
(6) roughing de-scaling process: de-scaling before roughing, de-scaling water pressure are 19MPa；
(7) roughing operation: single pass reduction ratio is 18%, total reduction 62%, and start rolling temperature is 1000 DEG C；
(8) finish rolling de-scaling process: de-scaling before finish rolling, de-scaling water pressure are 21MPa；
(9) finishing rolling step: finish rolling start rolling temperature is 890 DEG C, and finishing temperature is 780 DEG C, and finish rolling single pass reduction ratio is 15%, always
Reduction ratio is 43%；
(10) cooling process: final cooling temperature is 550 DEG C, is aligned after cooling, and straightening temperature is 418 DEG C；
(11) slow cooling operation: concentrating after aligning and stack slow cooling, stacks 348 DEG C of slow cooling temperature, slow cooling time 50h.
The mechanical property of the present embodiment think gauge high-strength steel plate are as follows: yield strength 512MPa, tensile strength 729MPa prolong
Stretch rate 19.5%, ballistic work (- 20 DEG C): 199J, 152J, 178J.
Embodiment 4
The present embodiment think gauge high-strength steel plate steel grade is Q460C, with a thickness of 90mm, and chemical component composition and quality percentage contain
Amount are as follows: C:0.12%, Mn:1.75%, Si:0.25%, Al:0.025%, V:0.06%, Ti:0.2%, Nb:0.04%, Mo:0.15%, S:
0.013%, P:0.026%, surplus are Fe and inevitable impurity.
The present embodiment think gauge high-strength steel sheet production method include converter smelting, LF refining, RH refining, continuous casting, heating,
Roughing de-scaling, roughing, finish rolling de-scaling, finish rolling, cooling and slow cooling operation, specific process step are as described below:
(1) converter smelting process: the control of converter smelting endpoint carbon is 0.10%, and temperature control is 1660 DEG C, the top of the slag of slag-stopping tapping
With a thickness of 65mm；
(2) LF refining process: LF refining feeds 40 ㎏/t steel aluminium calcium line, and soft blow argon flow is 45NL/min, soft blow time
For 12min；
(3) remaining alloy, adjustment ladle chemistry to target zone, vacuum degree RH refining procedure: are supplied in RH refining process
112KPa, vacuum retention time are 10min；
(4) continuous casting working procedure: using when continuous casting under weight and electromagnetic agitation, and drafts is 20mm, electromagnetic agitation electric current under weight
445A obtains 250mm*1800mm steel billet；
(5) heating process: slab heating temperature is 1120 DEG C, heating time 3.5h, and slab is without obvious blackspot after heating, logical
The temperature difference is 43 DEG C on length direction, base wide direction；
(6) roughing de-scaling process: de-scaling before roughing, de-scaling water pressure are 22MPa；
(7) roughing operation: single pass reduction ratio is 22%, total reduction 66%, and start rolling temperature is 1050 DEG C；
(8) finish rolling de-scaling process: de-scaling before finish rolling, de-scaling water pressure are 19MPa；
(9) finishing rolling step: finish rolling start rolling temperature is 910 DEG C, and finishing temperature is 820 DEG C, and finish rolling single pass reduction ratio is 9%, stagnation pressure
Lower rate is 33%；
(10) cooling process: final cooling temperature is 630 DEG C, is aligned after cooling, and straightening temperature is 463 DEG C；
(11) slow cooling operation: concentrating after aligning and stack slow cooling, stacks 305 DEG C of slow cooling temperature, slow cooling time 55h.
The mechanical property of the present embodiment think gauge high-strength steel plate are as follows: yield strength 469MPa, tensile strength 645MPa prolong
Stretch rate 22%, ballistic work (0 DEG C): 150J, 177J, 123J.
Embodiment 5
The present embodiment think gauge high-strength steel plate steel grade is Q460D, with a thickness of 105mm, chemical component composition and quality percentage
Content are as follows: C:0.11%, Mn:1.75%, Si:0.25%, Al:0.025%, V:0.06%, Ti:0.2%, Nb:0.035%, Mo:
0.15%, S:0.013%, P:0.018%, surplus are Fe and inevitable impurity.
The present embodiment think gauge high-strength steel sheet production method include converter smelting, LF refining, RH refining, continuous casting, heating,
Roughing de-scaling, roughing, finish rolling de-scaling, finish rolling, cooling and slow cooling operation, specific process step are as described below:
(1) converter smelting process: the control of converter smelting endpoint carbon is 0.23%, and temperature control is 1670 DEG C, the top of the slag of slag-stopping tapping
With a thickness of 75mm；
(2) LF refining process: LF refining feeds 41 ㎏/t steel aluminium calcium line, and soft blow argon flow is 55NL/min, soft blow time
For 9min；
(3) remaining alloy, adjustment ladle chemistry to target zone, vacuum degree RH refining procedure: are supplied in RH refining process
95KPa, vacuum retention time are 11min；
(4) continuous casting working procedure: using when continuous casting under weight and electromagnetic agitation, and drafts is 17mm, electromagnetic agitation electric current under weight
452A obtains 280mm*1800mm steel billet；
(5) heating process: slab heating temperature is 1150 DEG C, heating time 4.3h, and slab is without obvious blackspot after heating, logical
The temperature difference is 14 DEG C on length direction, base wide direction；
(6) roughing de-scaling process: de-scaling before roughing, de-scaling water pressure are 21MPa；
(7) roughing operation: single pass reduction ratio is 20%, total reduction 61%, and start rolling temperature is 1170 DEG C；
(8) finish rolling de-scaling process: de-scaling before finish rolling, de-scaling water pressure are 18MPa；
(9) finishing rolling step: finish rolling start rolling temperature is 900 DEG C, and finishing temperature is 760 DEG C, and finish rolling single pass reduction ratio is 20%, always
Reduction ratio is 48%；
(10) cooling process: final cooling temperature is 670 DEG C, is aligned after cooling, and straightening temperature is 409 DEG C；
(11) slow cooling operation: concentrating after aligning and stack slow cooling, stacks 312 DEG C of slow cooling temperature, slow cooling time 50h.
The mechanical property of the present embodiment think gauge high-strength steel plate are as follows: yield strength 489MPa, tensile strength 650MPa prolong
Stretch rate 18.5%, ballistic work (- 20 DEG C): 189J, 133J, 145J.
Embodiment 6
The present embodiment think gauge high-strength steel plate steel grade is Q460C, with a thickness of 110mm, chemical component composition and quality percentage
Content are as follows: C:0.12%, Mn:1.83%, Si:0.28%, Al:0.025%, V:0.06%, Ti:0.2%, Nb:0.04%, Mo:0.15%,
S:0.013%, P:0.026%, surplus are Fe and inevitable impurity.
The present embodiment think gauge high-strength steel sheet production method include converter smelting, LF refining, RH refining, continuous casting, heating,
Roughing de-scaling, roughing, finish rolling de-scaling, finish rolling, cooling and slow cooling operation, specific process step are as described below:
(1) converter smelting process: the control of converter smelting endpoint carbon is 0.20%, and temperature control is 1680 DEG C, the top of the slag of slag-stopping tapping
With a thickness of 63mm；
(2) LF refining process: LF refining feeds 43 ㎏/t steel aluminium calcium line, and soft blow argon flow is 47NL/min, soft blow time
For 11min；
(3) remaining alloy, adjustment ladle chemistry to target zone, vacuum degree RH refining procedure: are supplied in RH refining process
90KPa, vacuum retention time are 15min；
(4) continuous casting working procedure: using when continuous casting under weight and electromagnetic agitation, and drafts is 23mm, electromagnetic agitation electric current under weight
464A obtains 280mm*1800mm steel billet；
(5) heating process: slab heating temperature is 1180 DEG C, heating time 4.8h, and slab is without obvious blackspot after heating, logical
The temperature difference is 17 DEG C on length direction, base wide direction；
(6) roughing de-scaling process: de-scaling before roughing, de-scaling water pressure are 25MPa；
(7) roughing operation: single pass reduction ratio is 25%, total reduction 70%, and start rolling temperature is 1030 DEG C；
(8) finish rolling de-scaling process: de-scaling before finish rolling, de-scaling water pressure are 23MPa；
(9) finishing rolling step: finish rolling start rolling temperature is 920 DEG C, and finishing temperature is 835 DEG C, and finish rolling single pass reduction ratio is 17%, always
Reduction ratio is 45%；
(10) cooling process: final cooling temperature is 608 DEG C, is aligned after cooling, and straightening temperature is 442 DEG C；
(11) slow cooling operation: concentrating after aligning and stack slow cooling, stacks 336 DEG C of slow cooling temperature, slow cooling time 55h.
The mechanical property of the present embodiment think gauge high-strength steel plate are as follows: yield strength 488MPa, tensile strength 659MPa prolong
Stretch rate 22%, ballistic work (0 DEG C): 146J, 132J, 129J.
Embodiment 7
The present embodiment think gauge high-strength steel plate steel grade is Q460C, with a thickness of 120mm, chemical component composition and quality percentage
Content are as follows: C:0.1%, Mn:1.80%, Si:0.3%, Al:0.025%, V:0.06%, Ti:0.22%, Nb:0.05%, Mo:0.15%,
S:0.013%, P:0.026%, surplus are Fe and inevitable impurity.
The present embodiment think gauge high-strength steel sheet production method include converter smelting, LF refining, RH refining, continuous casting, heating,
Roughing de-scaling, roughing, finish rolling de-scaling, finish rolling, cooling and slow cooling operation, specific process step are as described below:
(1) converter smelting process: the control of converter smelting endpoint carbon is 0.08%, and temperature control is 1685 DEG C, the top of the slag of slag-stopping tapping
With a thickness of 68mm；
(2) LF refining process: LF refining feeds 30 ㎏/t steel aluminium calcium line, and soft blow argon flow is 42NL/min, soft blow time
For 14min；
(3) remaining alloy, adjustment ladle chemistry to target zone, vacuum degree RH refining procedure: are supplied in RH refining process
96KPa, vacuum retention time are 13min；
(4) continuous casting working procedure: using when continuous casting under weight and electromagnetic agitation, and drafts is 18mm, electromagnetic agitation electric current under weight
448A obtains 280mm*1800mm steel billet；
(5) heating process: slab heating temperature is 1250 DEG C, heating time 2.5h, and slab is without obvious blackspot after heating, logical
The temperature difference is 50 DEG C on length direction, base wide direction；
(6) roughing de-scaling process: de-scaling before roughing, de-scaling water pressure are 24MPa；
(7) roughing operation: single pass reduction ratio is 16%, total reduction 50%, and start rolling temperature is 1200 DEG C；
(8) finish rolling de-scaling process: de-scaling before finish rolling, de-scaling water pressure are 25MPa；
(9) finishing rolling step: finish rolling start rolling temperature is 850 DEG C, and finishing temperature is 750 DEG C, and finish rolling single pass reduction ratio is 8%, stagnation pressure
Lower rate is 32%；
(10) cooling process: final cooling temperature is 500 DEG C, is aligned after cooling, and straightening temperature is 400 DEG C；
(11) slow cooling operation: concentrating after aligning and stack slow cooling, stacks 354 DEG C of slow cooling temperature, slow cooling time 50h.
The mechanical property of the present embodiment think gauge high-strength steel plate are as follows: yield strength 485MPa, tensile strength 669MPa prolong
Stretch rate 23%, ballistic work (0 DEG C): 187J, 153J, 133J.
Embodiment 8
The present embodiment think gauge high-strength steel plate steel grade is Q460C, with a thickness of 90mm, and chemical component composition and quality percentage contain
Amount are as follows: C:0.10%, Mn:1.9%, Si:0.30%, Al:0.026%, V:0.07%, Ti:0.23%, Nb:0.04%, Mo:0.15%, S:
0.013%, P:0.026%, surplus are Fe and inevitable impurity.
The present embodiment think gauge high-strength steel sheet production method include converter smelting, LF refining, RH refining, continuous casting, heating,
Roughing de-scaling, roughing, finish rolling de-scaling, finish rolling, cooling and slow cooling operation, specific process step are as described below:
(1) converter smelting process: the control of converter smelting endpoint carbon is 0.25%, and temperature control is 1678 DEG C, the top of the slag of slag-stopping tapping
With a thickness of 77mm；
(2) LF refining process: LF refining feeds 45 ㎏/t steel aluminium calcium line, and soft blow argon flow is 56NL/min, soft blow time
For 8min；
(3) remaining alloy, adjustment ladle chemistry to target zone, vacuum degree RH refining procedure: are supplied in RH refining process
108KPa, vacuum retention time are 14min；
(4) continuous casting working procedure: using when continuous casting under weight and electromagnetic agitation, and drafts is 26mm, electromagnetic agitation electric current under weight
460A obtains 250mm*1800mm steel billet；
(5) heating process: slab heating temperature is 1135 DEG C, heating time 5.0h, and slab is without obvious blackspot after heating, logical
The temperature difference is 30 DEG C on length direction, base wide direction；
(6) roughing de-scaling process: de-scaling before roughing, de-scaling water pressure are 25MPa；
(7) roughing operation: single pass reduction ratio is 19%, total reduction 55%, and start rolling temperature is 1150 DEG C；
(8) finish rolling de-scaling process: de-scaling before finish rolling, de-scaling water pressure are 24MPa；
(9) finishing rolling step: finish rolling start rolling temperature is 930 DEG C, and finishing temperature is 850 DEG C, and finish rolling single pass reduction ratio is 19%, always
Reduction ratio is 50%；
(10) cooling process: final cooling temperature is 700 DEG C, is aligned after cooling, and straightening temperature is 425 DEG C；
(11) slow cooling operation: concentrating after aligning and stack slow cooling, stacks 300 DEG C of slow cooling temperature, slow cooling time 48h.
The mechanical property of the present embodiment think gauge high-strength steel plate are as follows: yield strength 520MPa, tensile strength 704MPa prolong
Stretch rate 20.5%, ballistic work (0 DEG C): 272J, 287J, 295J.
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 this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (10)
1. a kind of production method of think gauge high-strength steel plate, which is characterized in that the production method includes converter smelting, LF essence
Refining, RH refining, continuous casting, heating, roughing de-scaling, roughing, finish rolling de-scaling, finish rolling, cooling and slow cooling operation；The RH refines work
Sequence, remaining alloy, adjustment ladle chemistry to target zone are supplied in RH refining process, and vacuum degree≤120KPa, vacuum are protected
Hold the time >=8min；The continuous casting working procedure, using under weight and electromagnetic agitation when continuous casting, drafts is 15~30mm under weight,
Electromagnetic agitation electric current >=440A；The roughing operation, single pass reduction ratio are 15~25%, and total reduction is 50~70%, open rolling
1000~1200 DEG C of temperature；The finishing rolling step, 850~930 DEG C of finish rolling start rolling temperature, 750~850 DEG C of finishing temperature, finish rolling
Single pass reduction ratio 8~20%, total reduction 30~50%；The slow cooling operation, concentrates after aligning and stacks slow cooling, and heap slows down
Cold temperature >=300 DEG C, slow cooling time >=48h.
2. a kind of production method of think gauge high-strength steel plate according to claim 1, which is characterized in that the converter smelting
Process is refined, the control of converter smelting endpoint carbon is 0.08~0.25%, and temperature control is at 1655~1685 DEG C, the top of the slag of slag-stopping tapping
With a thickness of 60~80mm.
3. a kind of production method of think gauge high-strength steel plate according to claim 1, which is characterized in that the LF refining
Process, LF refining feed 30~45 ㎏/t steel aluminium calcium line, and 40~60NL/min of soft blow argon flow, soft blow time 8~
15min。
4. a kind of production method of think gauge high-strength steel plate according to claim 1, which is characterized in that the heater
Sequence, slab heating temperature are 1100~1250 DEG C, 2.5~5.0h of heating time, and slab is without obvious blackspot after heating, in elongated side
The temperature difference≤50 DEG C in, base wide direction.
5. a kind of production method of think gauge high-strength steel plate according to any one of claims 1-4, which is characterized in that
The roughing de-scaling process, de-scaling before roughing, de-scaling water pressure >=18MPa.
6. a kind of production method of think gauge high-strength steel plate according to any one of claims 1-4, which is characterized in that
The finish rolling de-scaling process, de-scaling before finish rolling, de-scaling water pressure >=18MPa.
7. a kind of production method of think gauge high-strength steel plate according to any one of claims 1-4, which is characterized in that
The cooling process, final cooling temperature is at 500~700 DEG C；It is aligned after cooling, straightening temperature >=400 DEG C.
8. a kind of production method of think gauge high-strength steel plate according to any one of claims 1-4, which is characterized in that
The high-strength steel plate thickness specification of the production method production is 80~120mm, and compression ratio is 2.2~3.2.
9. a kind of production method of think gauge high-strength steel plate according to any one of claims 1-4, which is characterized in that
The think gauge high-strength steel sheet mechanical property of the production method production are as follows: 460~530MPa of yield strength, tensile strength 630
~730MPa, elongation percentage 18~28%, ballistic work: 120~300J.
10. a kind of production method of think gauge high-strength steel plate according to any one of claims 1-4, feature exist
In the production method is suitble to steel grade to be Q460C/D.
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