CN105755375A - Low-compression-ratio high-performance ultra-thick steel plate produced by continuous casting billet and manufacturing method of steel plate - Google Patents
Low-compression-ratio high-performance ultra-thick steel plate produced by continuous casting billet and manufacturing method of steel plate Download PDFInfo
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- CN105755375A CN105755375A CN201610241720.6A CN201610241720A CN105755375A CN 105755375 A CN105755375 A CN 105755375A CN 201610241720 A CN201610241720 A CN 201610241720A CN 105755375 A CN105755375 A CN 105755375A
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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
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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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
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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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- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- 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
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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
- C22C38/02—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
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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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Abstract
The invention relates to a low-compression-ratio high-performance ultra-thick steel plate produced by a continuous casting billet.The steel plate is chemically composed of, by weight, 0.01-0.15% of C, 0.15-0.35% of Si, 1.40-1.60% of Mn, less than or equal to 0.008% of P, less than or equal to 0.002% of S, 0.02-0.05% of Al, 0.02-0.05% of Nb, 0.02-0.05% of V, 0.20-0.50% of Ni and the balance of Fe and unavoidable impurity elements.The manufacturing method includes steps of KR pretreatment, converter smelting, LF refining, RH refining, plate billet continuous casting, plate billet slow cooling, plate billet heating, cogging and rolling, intermediate billet slow cooling, intermediate billet heating, finished steel plate rolling, steel plate slow cooling, flaw detection, normalizing, finishing, inspection and warehousing.The steel plate has high low-temperature impact toughness, high strength and excellent resistance to lamellar tearing when the compression ratio is less than 2.0.
Description
Technical field
The invention belongs to steel plate and manufacture field, being specifically related to a kind of thickness is 250mm high performance pressure container super-thick steel plate and manufacture method thereof.
Background technology
Super-thick steel plate refers generally to the thickness steel plate more than 100mm, is used for dual-use important feature, and the internal soundness of product, welding performance, low temperature impact properties and anti-lamellar tearing performance are had strict demand.Along with the increase of China's base structure construction project, super-thick steel plate market demand is increasing, and develops to big thickness, big substance, high-quality performance direction.The blank producing super-thick steel plate at present generally has forging and stamping base, bloom, continuous casting billet, molding cast slab, electroslag remelting slab ingot and composite billet.Various blanks are respectively arranged with benefit and limitation in producing super-thick steel plate, it is impossible to mutually substitute completely.Relatively and so, continuous casting billet has that technological process is short, lumber recovery is high and the advantage such as energy saving of system.But, it is subject to the restriction of thickness of strand and compression ratio, adopts continuous casting billet direct rolling process to produce super-thick steel plate thickness at below 200mm, and general not high for 100～200mm thickness range plate property qualification rate and flaw detection qualification rate.
Along with the development of steel-making, refine and continuous casting technology, Cross Section of CC Billet size is gradually increased, and quality improves constantly.Adopt high-quality continuous casting steel billet to produce high performance ultra-thick steel plate and become inevitable development trend.JFE company adopts 310mm thickness high-quality continuous casting steel billet to produce, by forging rolling mill practice, the super-thick steel plate that maximum gauge is 240mm, and compression ratio is 1.29.The application for a patent for invention that publication No. is CN104971962A relates to " method that the deformation of a kind of continuous casting steel billet two dimension produces super-thick steel plate ", and main employing 300mm thickness continuous casting steel billet produces 245mm thickness super-thick steel plate by high temperature forging+rolling mill practice, and compression ratio is 1.2.Adopting continuous casting billet forging+milling method to produce super-thick steel plate and can significantly reduce compression ratio, improve internal quality of steel plate, but increase forging process, lumber recovery is relatively low, and production cost is high.
The application for a patent for invention that notification number is CN103014283A relates to " manufacture method that a kind of continuous casting steel billet produces power station super-thick steel plate ", provide a kind of employing 400mm continuous casting steel billet and produce 100-150mm super-thick steel plate, compression ratio is 2.67, the compression that this patent adopts is relatively larger, steel plate thickness is less, and production technology difficulty is relatively low.The application for a patent for invention that publication No. is 104451357A relates to " low compression ratio super-thick steel plate of a kind of 160mm thickness Q235C and preparation method thereof ", disclose the use of 320mm thickness continuous casting steel billet and produce 160mm super-thick steel plate production technology, compression ratio is 2.0, although this patent is compressed smaller, but the patented product only can guarantee that 0 DEG C of impact, and anti-lamellar tearing performance cannot ensure.Publication No. is that CN102330017A application for a patent for invention relates to " using the method that continuous casting billet produces super-thick steel plate when small reduction ratio ", main employing 300mm thickness continuous casting billet produces 140mm thickness Q345E-Z35 steel plate, compression ratio is 2.14,-40 DEG C of impact values are at below 80J, surplus is less, low-temperature impact toughness advantage is failed to understand, unstable product quality.Existing technique all adopts continuous casting billet direct rolling process to produce super-thick steel plate above, and compression ratio does not break through 2.0, and product thickness is less, and comprehensive mechanical performance advantage is inconspicuous.
Based on above prior art, applicant proposes a kind of continuous casting billet and produces low compression ratio high performance ultra-thick steel plate and manufacture method thereof, at compression ratio lower than under 2.0 conditions, guarantee that steel plate still has good internal soundness and excellent comprehensive mechanical performance, production cost is lower, it is suitable for batch production, does not find the patent relevant to this technique through retrieval.
Summary of the invention
The technical problem to be solved is the P355NL2 steel plate providing a kind of thickness to be 250mm for above-mentioned prior art, can be applicable to the manufacture of boiler and pressure vessel and equipment, there is the anti-lamellar tearing performance of good internal soundness, higher low-temperature impact toughness and excellence.
Another object of the present invention is to provide a kind of method adopting continuous casting billet to produce low compression ratio high performance ultra-thick steel plate.
nullThis invention address that the technical scheme that above-mentioned technical problem adopts is，A kind of continuous casting billet produces low compression ratio high-performance 250mm thickness P355NL2 super-thick steel plate，The chemical composition of this steel plate is C:0.08～0.15% by weight percentage，Si:0.15～0.35%，Mn:1.40～1.60%，P :≤0.008%，S :≤0.002%，Al:0.02～0.05%，Nb:0.02～0.05%，V:0.02～0.05%，Ni:0.20～0.50%，Surplus is Fe and inevitable impurity element，Carbon equivalent Ceq≤0.45%，Computing formula is: Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15，Steel plate compression ratio is less than 2.0.
Further, the invention belongs to 250mm thickness continuous casting billet and produce low compression ratio high-performance P355NL2 super-thick steel plate, its mechanical performance meets: yield strength >=350Mpa, tensile strength >=520Mpa, elongation after fracture >=30%, the horizontal Charpy-V impact power monodrome >=150J in-50 DEG C of heart portion, thickness direction Tensile fracture shrinkage factor >=60%.Steel plate UT flaw detection can meet NB/T47013.3I level requirement.
The chemical composition of the 250mm super-thick steel plate that continuous casting billet of the present invention produces low compression ratio high-performance P355NL2 is determined such that
The composition of the present invention mainly adopts low-carbon (LC), low-sulfur phosphorus, Nb+V microalloying ingredient to design, and adds appropriate Ni element simultaneously, improves low-temperature impact toughness.Chemical element effect in steel is as follows:
C: carbon can significantly improve the intensity of steel plate, but steel plate can be made during too high levels moulding and impact flexibility variation, and this patent carbon content control is 0.08～0.15%.
Mn: manganese is good deoxidizer and desulfurizing agent in steelmaking process, it is possible to improving armor plate strength and toughness, but too high levels can cause that continuous casting slab segregation is serious, this patent Fe content controls 1.40～1.60%.
Si: silicon is to be good reducing agent and deoxidizer in steelmaking process, but too high levels can reduce impact flexibility and plate surface quality, and this patent silicone content controls 0.15～0.35%.
P: phosphorus is harmful element, increases the cold brittleness of steel, makes plasticity and welding performance be deteriorated, should reduce as far as possible, and this patent phosphorus content controls below 0.008%.
S: sulfur is harmful element, increases the red brittleness of steel, reduces toughness and ductility, and welding performance is unfavorable, should reduce as far as possible, and this patent sulfur content controls below 0.002%.
Ni: nickel can significantly improve low-temperature impact toughness, can improve intensity simultaneously, but can increase production cost, should control to use, and this patent nickel content controls 0.20～0.50%.
Nb, V: niobium, vanadium microalloy element form carbonitride with C, N element, there is postponement austenite recrystallization, the effect of fining ferrite grains, it is possible to simultaneously improve armor plate strength and toughness, this patent Nb content controls 0.02～0.05%, V content controls 0.02～0.05%.
Above-mentioned continuous casting billet produces the manufacture method of low compression ratio high-performance 250mm super-thick steel plate.
The technological process of production: KR pretreatment → converter smelting → LF refine → RH refine → sheet billet continuous casting → slab slow cooling → heating of plate blank → split rolling method → intermediate blank slow cooling → intermediate blank heating → finished steel plate rolling → steel plate slow cooling → flaw detection → normalizing → finishing → inspection → warehouse-in.
The concrete operations of master operation are as follows,
1) smelting process
450mm continuous casting steel billet is adopted to produce, improving Molten Steel Cleanliness, reducing strand segregation is reduce compression ratio, the precondition ensureing super-thick steel plate internal soundness and key measure, raw materials for metallurgy is through KR molten iron pretreatment, Slag treatment is taken off after converter smelting, strictly control S≤0.002%, P≤0.008%, H≤1.2ppm, O≤20ppmm, N≤40ppm；Continuous casting working procedure adopts low overheat whole process argon for protecting pouring, controls strand segregation C class less than 1.0 grades by dynamic soft reduction technology；Slab roll off the production line after covering slow cooling more than 48 hours, it is ensured that the hydrogen in steel fully spreads.
2) heating, rolling mill practice
Adopting cogging two pyrogene material rolling mill practice, workpiece thickness is 350mm；
450mm continuous casting steel billet adopts zone heating mode: total heat time heating time is 550～650min, first bringing-up section temperature is 1050～1150 DEG C, second bringing-up section temperature is 1200～1260 DEG C, soaking zone temperature is 1180～1250 DEG C, second bringing-up section and soaking zone total heat time heating time >=300min, it is ensured that strand segregation is fully spread；
350mm intermediate blank reheats and adopts zone heating mode: total heat time heating time is 400～500min, first bringing-up section temperature is 1050～1150 DEG C, second bringing-up section temperature is 1200～1260 DEG C, soaking zone temperature is 1170～1250 DEG C, second bringing-up section and soaking zone total heat time heating time >=250min, it is ensured that intermediate blank segregation is fully spread；
Twice rolling all adopts " the big pressure of high temperature " technique, makes loose abundant pressing, improves internal quality of steel plate and heart portion performance；
Split rolling method start rolling temperature is 1060～1100 DEG C, and finishing temperature is 1020～1060 DEG C, and single pass drafts is that 30-50mm, 2-3 passage completes rolling；
The intermediate blank start rolling temperature processed that rerolls is 1050～1100 DEG C, and finishing temperature is 1010～1050 DEG C, and single pass drafts is that 30-50mm, 2-3 passage completes rolling；
Intermediate blank and finished steel plate roll off the production line after stacking slow cooling >=72 hour, fully expand hydrogen；
3) Technology for Heating Processing
Adopting normalizing process, normalizing temperature is 880～900 DEG C, temperature retention time coefficient: 2.2～2.5min/mm, air cooling；In order to ensure cooling effect after normalizing, steel plate is individually put after rolling off the production line.
The present invention adopts 450mm thickness continuous casting billet cogging two pyrogene material explained hereafter 250mm thickness high-quality performance steel plate, 1) compression ratio is below 2.0；2) by segregation element, the smelting processes such as reduction C, Mn, S, P reduce gas content and adopt the means such as continuous casting steel billet slighter compress to reduce continuous casting slab segregation and loose on composition, steel ingot degree of purity is improved；3) by adopting cogging technics, make blank through the big pressure rolling of twice High temperature diffusion and high temperature, loose in abundant pressing steel, improve internal quality of steel plate；4) by low-carbon (LC), low-sulfur phosphorus, the design of Nb+V microalloy composition, add Ni element, it is ensured that there is after steel plate normalizing the anti-lamellar tearing performance of good low-temperature impact toughness, higher intensity and excellence simultaneously.
Compared with prior art, the present invention has a characteristic that
The present invention relates to a kind of 250mm thickness continuous casting billet and produce low compression ratio high-performance P355NL2 super-thick steel plate, this steel plate at compression ratio less than, under 2.0 conditions, there is the anti-lamellar tearing performance of good low-temperature impact toughness, higher intensity and excellence.
To achieve these goals, the present invention adopts 450mm thickness continuous casting billet cogging two pyrogene material explained hereafter, improves Molten Steel Cleanliness and slab internal soundness by reducing segregation element and gas content and soft reduction technique；Segregation is made fully to spread heat time heating time by extending blank high temperature section；By adopting high temperature big pressure rolling mill practice to make loose abundant pressing；By low-carbon (LC), low-sulfur phosphorus, the design of Nb+V microalloy composition, add Ni element, it is ensured that there is after steel plate normalizing the anti-lamellar tearing performance of good low-temperature impact toughness, higher intensity and excellence simultaneously.
The mode of production of steel plate of the present invention is unique, adopt 450mm thickness continuous casting billet cogging two pyrogene material explained hereafter, instead of continuous casting billet high temperature forging+rolling process, reduce production cost, in producing steel plate maximum gauge, reducing compression ratio and improve super-thick steel plate internal soundness and improve steel plate heart portion impact flexibility, be better than continuous casting billet direct rolling process.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment 1
The thickness of the P355NL2 steel plate of the present embodiment is 250mm, and its chemical composition is by weight percentage: C:0.12%, Si:0.25%, Mn:1.50%, P:0.005%, S:0.001%, Nb:0.03%, V:0.03%, Alt:0.030%, Ni:0.45%, H:0.00006%, O:0.0015%, N:0.0035%, surplus is Fe and inevitable impurity element, and carbon equivalent Ceq≤0.45%, computing formula is: Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15.
The manufacturing process of this steel plate is as follows:
Adopt 450mm thickness continuous casting steel billet cogging two pyrogene material explained hereafter, production process route: KR pretreatment → converter smelting → LF refine → RH refine → sheet billet continuous casting → slab slow cooling → heating of plate blank → split rolling method → intermediate blank slow cooling → intermediate blank heating → finished steel plate rolling → steel plate slow cooling → flaw detection → normalizing → finishing → inspection → warehouse-in.
1) smelting process
Improving Molten Steel Cleanliness, reducing strand segregation is reduce compression ratio, the precondition ensureing super-thick steel plate internal soundness and key measure.Raw materials for metallurgy, through KR molten iron pretreatment, takes off Slag treatment after converter smelting, strictly control S≤0.002%, P≤0.008%, H≤1.2ppm, O≤20ppmm, N≤40ppm；Continuous casting working procedure adopts low overheat whole process argon for protecting pouring, controls strand segregation C class less than 1.0 grades by dynamic soft reduction technology.Slab roll off the production line after covering slow cooling more than 48 hours, it is ensured that the hydrogen in steel fully spreads.
2) heating, rolling mill practice
Adopting cogging two pyrogene material rolling mill practice, workpiece thickness is 350mm；
450mm continuous casting steel billet adopts zone heating mode: total heat time heating time is 600min, first bringing-up section temperature is 1140 DEG C, and the second bringing-up section temperature is 1240 DEG C, and soaking zone temperature is 1230 DEG C, second bringing-up section and soaking zone total heat time heating time >=300min, it is ensured that strand segregation is fully spread；
350mm intermediate blank reheats and adopts zone heating mode: total heat time heating time is 480min, first bringing-up section temperature is 1130 DEG C, and the second bringing-up section temperature is 1250 DEG C, and soaking zone temperature is 1240 DEG C, second bringing-up section and soaking zone total heat time heating time >=250min, it is ensured that intermediate blank segregation is fully spread.
Twice rolling all adopts " the big pressure of high temperature " technique, makes loose abundant pressing, improves internal quality of steel plate and heart portion performance；
Split rolling method start rolling temperature is 1080 DEG C, and finishing temperature is 1050 DEG C, and single pass drafts is 50mm, and two passages complete rolling；
The intermediate blank start rolling temperature processed that rerolls is 1070 DEG C, and finishing temperature is 1040 DEG C, and single pass drafts is 50mm, and two passages complete rolling；
Intermediate blank and finished steel plate roll off the production line after stacking slow cooling >=72 hour, fully expand hydrogen.
3) Technology for Heating Processing
Adopting normalizing process, normalizing temperature is 890 DEG C, temperature retention time coefficient: 2.4min/mm, air cooling；In order to ensure cooling effect after normalizing, steel plate is individually put after rolling off the production line.
The 250mm thickness continuous casting billet prepared via above-mentioned manufacturing process produces low compression ratio high-performance P355NL2 super-thick steel plate, and UT flaw detection meets NB/T47013.3 standard I level requirement, has the good comprehensive mechanical performance of coupling and refers to table 1.
Embodiment 2
The thickness of the steel plate of pressure vessel of the present embodiment is 250mm, and its chemical composition is by weight percentage: C:0.13%, Si:0.28%, Mn:1.52%, P:0.006%, S:0.001%, Nb:0.025%, V:0.03%, Alt:0.035%, Ni:0.43%, H:0.00010%, O:0.0012%, N:0.0036%, surplus is Fe and inevitable impurity element, and carbon equivalent Ceq≤0.45%, computing formula is: Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15..
The manufacturing process of this steel plate is as follows:
Adopt 450mm thickness continuous casting steel billet cogging two pyrogene material explained hereafter, production process route: KR pretreatment → converter smelting → LF refine → RH refine → sheet billet continuous casting → slab slow cooling → heating of plate blank → split rolling method → intermediate blank slow cooling → intermediate blank heating → finished steel plate rolling → steel plate slow cooling → flaw detection → normalizing → finishing → inspection → warehouse-in.
1) smelting process
Improving Molten Steel Cleanliness, reducing strand segregation is reduce compression ratio, the precondition ensureing super-thick steel plate internal soundness and key measure.Raw materials for metallurgy, through KR molten iron pretreatment, takes off Slag treatment after converter smelting, strictly control S≤0.002%, P≤0.008%, H≤1.2ppm, O≤20ppmm, N≤40ppm；Continuous casting working procedure adopts low overheat whole process argon for protecting pouring, controls strand segregation C class less than 1.0 grades by dynamic soft reduction technology.Slab roll off the production line after covering slow cooling more than 48 hours, it is ensured that the hydrogen in steel fully spreads.
2) heating, rolling mill practice
Adopting cogging two pyrogene material rolling mill practice, workpiece thickness is 350mm.
450mm continuous casting steel billet adopts zone heating mode: total heat time heating time is 620min, first bringing-up section temperature is 1142, and the second bringing-up section temperature is 1245 DEG C, and soaking zone temperature is 1235 DEG C, second bringing-up section and soaking zone total heat time heating time >=300min, it is ensured that strand segregation is fully spread.
350mm intermediate blank reheats and adopts zone heating mode: total heat time heating time is 490min, first bringing-up section temperature is 1135 DEG C, and the second bringing-up section temperature is 1247 DEG C, and soaking zone temperature is 1242 DEG C, second bringing-up section and soaking zone total heat time heating time >=250min, it is ensured that strand segregation is fully spread.
Twice rolling all adopts " the big pressure of high temperature " technique, makes loose abundant pressing, improves internal quality of steel plate and heart portion performance,
Split rolling method start rolling temperature is 1072 DEG C, and finishing temperature is 1045 DEG C, and single pass drafts is 50mm, and two passages complete rolling；
The intermediate blank start rolling temperature processed that rerolls is 1063 DEG C, and finishing temperature is 1035 DEG C, and single pass drafts is 50mm, and two passages complete rolling.
Intermediate blank and finished steel plate roll off the production line after stacking slow cooling >=72 hour, fully expand hydrogen.
3) Technology for Heating Processing
Adopting normalizing process, normalizing temperature is 890 DEG C, temperature retention time coefficient: 2.5min/mm, air cooling；In order to ensure cooling effect after normalizing, steel plate is individually put after rolling off the production line.
The 250mm thickness continuous casting billet prepared via above-mentioned manufacturing process produces low compression ratio high-performance P355NL2 super-thick steel plate, and UT flaw detection meets NB/T47013.3 standard I level requirement, has the good comprehensive mechanical performance of coupling and refers to table 1.
Embodiment 3
The thickness of the steel plate of pressure vessel of the present embodiment is 250mm, and its chemical composition is by weight percentage: C:0.12%, Si:0.26%, Mn:1.55%, P:0.006%, S:0.001%, Nb:0.032%, V:0.028%, Alt:0.032%, Ni:0.45%, H:0.00011%, O:0.0012%, N:0.0035%, surplus is Fe and inevitable impurity element, carbon equivalent Ceq≤0.45%, and computing formula is: Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15.
The manufacturing process of this steel plate is as follows:
Adopt 450mm thickness continuous casting steel billet cogging two pyrogene material explained hereafter, production process route: KR pretreatment → converter smelting → LF refine → RH refine → sheet billet continuous casting → slab slow cooling → heating of plate blank → split rolling method → intermediate blank slow cooling → intermediate blank heating → finished steel plate rolling → steel plate slow cooling → flaw detection → normalizing → finishing → inspection → warehouse-in.
1) smelting process
Improving Molten Steel Cleanliness, reducing strand segregation is reduce compression ratio, the precondition ensureing super-thick steel plate internal soundness and key measure.Raw materials for metallurgy, through KR molten iron pretreatment, takes off Slag treatment after converter smelting, strictly control S≤0.002%, P≤0.008%, H≤1.2ppm, O≤20ppmm, N≤40ppm；Continuous casting working procedure adopts low overheat whole process argon for protecting pouring, controls strand segregation C class less than 1.0 grades by dynamic soft reduction technology.Slab roll off the production line after covering slow cooling more than 48 hours, it is ensured that the hydrogen in steel fully spreads.
2) heating, rolling mill practice
Adopting cogging two pyrogene material rolling mill practice, workpiece thickness is 350mm.
450mm continuous casting steel billet adopts zone heating mode: total heat time heating time is 650min, first bringing-up section temperature is 1135, and the second bringing-up section temperature is 1243 DEG C, and soaking zone temperature is 1231 DEG C, second bringing-up section and soaking zone total heat time heating time >=300min, it is ensured that strand segregation is fully spread.
350mm intermediate blank reheats and adopts zone heating mode: total heat time heating time is 475min, first bringing-up section temperature is 1132 DEG C, and the second bringing-up section temperature is 1247 DEG C, and soaking zone temperature is 1236 DEG C, second bringing-up section and soaking zone total heat time heating time >=250min, it is ensured that strand segregation is fully spread.
Twice rolling all adopts " the big pressure of high temperature " technique, makes loose abundant pressing, improves internal quality of steel plate and heart portion performance.
Split rolling method start rolling temperature is 1082 DEG C, and finishing temperature is 1048 DEG C, and single pass drafts is 50mm, and two passages complete rolling.
The intermediate blank start rolling temperature processed that rerolls is 1072 DEG C, and finishing temperature is 1037 DEG C, and single pass drafts is 50mm, and two passages complete rolling.
Intermediate blank and finished steel plate roll off the production line after stacking slow cooling >=72 hour, fully expand hydrogen.
3) Technology for Heating Processing
Adopting normalizing process, normalizing temperature is 900 DEG C, temperature retention time coefficient: 2.2min/mm, air cooling；In order to ensure cooling effect after normalizing, steel plate is individually put after rolling off the production line.
The 250mm thickness continuous casting billet prepared via above-mentioned manufacturing process produces low compression ratio high-performance P355NL2 super-thick steel plate, and UT flaw detection meets NB/T47013.3 standard I level requirement, has the good comprehensive mechanical performance of coupling and refers to table 1.
The mechanical performance of the steel plate that each embodiment of table 1 produces
Note: be meansigma methods in ().
Claims (3)
1. a continuous casting billet produces low compression ratio high performance ultra-thick steel plate, it is characterized in that: the chemical composition of this steel plate is by weight percentage for C:0.08～0.15%, Si:0.15～0.35%, Mn:1.40～1.60%, P :≤0.008%, S :≤0.002%, Al:0.02～0.05%, Nb:0.02～0.05%, V:0.02～0.05%, Ni:0.20～0.50%, surplus is Fe and inevitable impurity element, carbon equivalent Ceq≤0.45%, computing formula is: Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15, the thickness of steel plate finished product is 250mm to the maximum, steel plate compression ratio is less than 2.0.
2. continuous casting billet according to claim 1 produces low compression ratio high performance ultra-thick steel plate, it is characterized in that: the mechanical performance of steel plate finished product meets: yield strength >=350Mpa, tensile strength >=520Mpa, elongation after fracture >=30%, the horizontal Charpy-V impact power monodrome >=150J in-50 DEG C of heart portion, thickness direction Tensile fracture shrinkage factor >=60%, steel plate UT flaw detection can meet NB/T47013.3I level requirement.
3. one kind manufactures the method that continuous casting billet as claimed in claim 1 produces low compression ratio high performance ultra-thick steel plate, it is characterised in that:
Production process route: KR pretreatment → converter smelting → LF refine → RH refine → sheet billet continuous casting → slab slow cooling → heating of plate blank → split rolling method → intermediate blank slow cooling → intermediate blank heating → finished steel plate rolling → steel plate slow cooling → flaw detection → normalizing → finishing → inspection → warehouse-in；
The concrete operations of master operation are as follows:
1) smelting process
Producing 450mm continuous casting steel billet, raw materials for metallurgy, through KR molten iron pretreatment, takes off Slag treatment after converter smelting, control S≤0.002%, P≤0.008%, H≤1.2ppm, O≤20ppmm, N≤40ppm；Continuous casting working procedure adopts low overheat whole process argon for protecting pouring, controls strand segregation C class less than 1.0 grades by dynamic soft reduction technology；Slab roll off the production line after covering slow cooling more than 48 hours, it is ensured that the hydrogen in steel fully spreads；
2) heating, rolling mill practice
Adopting cogging two pyrogene material rolling mill practice, workpiece thickness is 350mm；
450mm continuous casting steel billet adopts zone heating mode: total heat time heating time is 550～650min, first bringing-up section temperature is 1050～1150 DEG C, second bringing-up section temperature is 1200～1260 DEG C, soaking zone temperature is 1180～1250 DEG C, second bringing-up section and soaking zone total heat time heating time >=300min, it is ensured that strand segregation is fully spread；
350mm intermediate blank reheats and adopts zone heating mode: total heat time heating time is 400～500min, first bringing-up section temperature is 1050～1150 DEG C, second bringing-up section temperature is 1200～1260 DEG C, soaking zone temperature is 1170～1250 DEG C, second bringing-up section and soaking zone total heat time heating time >=250min, it is ensured that strand segregation is fully spread；
Twice rolling all adopts " the big pressure of high temperature " technique,
Split rolling method start rolling temperature is 1060～1100 DEG C, and finishing temperature is 1020～1060 DEG C, and single pass drafts is that 30-50mm, 2-3 passage completes rolling；
The intermediate blank start rolling temperature processed that rerolls is 1050～1100 DEG C, and finishing temperature is 1010～1050 DEG C, and single pass drafts is that 30-50mm, 2-3 passage completes rolling；
Intermediate blank and finished steel plate roll off the production line after stacking slow cooling >=72 hour, fully expand hydrogen；
3) Technology for Heating Processing
Adopting normalizing process, normalizing temperature is 880～900 DEG C, temperature retention time coefficient: 2.2～2.5min/mm, air cooling；After normalizing, steel plate rolls off the production line and individually puts.
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| PCT/CN2016/102491 WO2017181632A1 (en) | 2016-04-19 | 2016-10-19 | Low compression ratio, high-performance, and super-thick steel plate produced using continuous billet casting, and manufacturing method thereof |
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