CN102943204A - Yield strength 1100MPa level engineering machinery non-quenched and tempered hot rolled strip and preparation method thereof - Google Patents
Yield strength 1100MPa level engineering machinery non-quenched and tempered hot rolled strip and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of metallurgy and in particular to a yield strength 1100MPa level engineering machinery non-quenched and tempered hot rolled strip and a preparation method thereof. The chemical components of the yield strength 1100MPa level engineering machinery non-quenched and tempered hot rolled strip comprises, by weight, C 0.06-0.12%, Si 0.10-0.30%, Mn 1.60-2.00%, Nb 0.00-0.04%, V 0.00-0.04%, Ti 0.15-0.20%, Ni 0.4-0.80%, Mo 0.20-0.60%, P<0.012%, S<0.01%, and the balance Fe. The yield strength is greater than or equals to 1100MPa, the tensile strength is greater than or equals to 1180MPa, and percentage elongation after fracture is greater than or equals to 11%. The yield strength 1100MPa level engineering machinery non-quenched and tempered hot rolled strip is designed by adopting low carbon components, and by reasonably adding microalloy elements and controlled rolling and controlled cooling technology, production yield strength is greater than or equals to 1100MPa, the tensile strength is greater than or equals to 1180MPa, and percentage elongation after fracture is not lower than 11%. Simultaneously, structure steel strips is provided with good usability, the metallographic structure is bainite/ martensitic structures which are small in grain, cost capable of being reduced no less than 300 yuan per ton, and great economic benefit can be generated.
Description
Technical field
The invention belongs to metallurgical technology field, particularly a kind of non-quenched and tempered state hot rolled strip and preparation method for yield strength 1100MPa level engineering machinery.
Background technology
Along with the development of construction machinery industry, the demand of the high-strength steel to intensity rank more than 900MPa is more and more urgent, simultaneously, and for saving resource, save energy and protection of the environment, in the urgent need to the high-quality steel of R & D intensity higher level.At present, the intensity rank of high-strength steel from yield strength 900MPa to yield strength more than 1100MPa, on the whole, more and more higher to the composite request of intensity, toughness and welding use properties.
The people such as foreign scholar Koo, adopt the low high Mn of C, by adding the alloying elements such as Nb, V, Ni, Mo, B, by controlled rolling press quenching method, prepared the plate of moderate thickness steel of tensile strength over 930MPa, and the steel plate microstructure has a certain proportion of lath martensite.The people such as Tamehiro adopt low C, and high Mn-Ni-Mo chemical composition has been developed hot-rolled high-strength steel, and think and will make tensile strength surpass 950MPa, must contain the martensite more than 90% in the steel plate microstructure, therefore, added a large amount of Ni and Mo element on Composition Design, cost of alloy is higher
.the scholars such as domestic Kang Yonglin, Zheng Hua, Yao Liandeng have carried out careful research for high-intensity low-carbon bainite; interpolation by alloying elements such as Nb, Ti, Ni, Mo, B; by forming the precipitation strength of niobium titanium, in conjunction with the phase transformation strengthening of bainite structure, make steel there is better forming property and low-temperature flexibility; from Composition Design; the precious alloy elements such as a large amount of Nb, Ni and Mo have been adopted; therefore, production cost is higher.At present, external Sweden SSAB, Japan, Finland and domestic Wuyang, the Hunan steel, Nangang, the hot-rolling high-strength steel of the 900MPa level of each large steel mill actual production such as Baosteel has all added the Mo of high added value to some extent, Cr, the alloying elements such as Ni, and production technique is hot rolling+modifier treatment, the treating processes of hardening and tempering process is, at first the steel plate after hot rolling is heated to high temperature austenite district or two-phase region, temperature is 850～950 ℃, being incubated 30～60min at this temperature does not wait, then quench, steel plate after quenching is carried out to 400～600 ℃ of temper, microstructure be take tempered martensite as main.The high tensile steel plate that is 1100MPa for yield strength,
Zhao Sixin, Jiang Hongsheng etc. have set forth a kind of thermal treatment high-strength steel, its composition characteristic is C:0.15 ~ 0.25%, Si:0.10 ~ 0.50%, Mn:0.60 ~ 1.20%, P≤0.013%, S≤0.003%, Cr:0.20 ~ 0.55%, Mo:0.20 ~ 0.70%, Ni:0.60 ~ 2.00%, Nb:0 ~ 0.07%, V:0 ~ 0.07%, B:0.0006 ~ 0.0025%, Al:0.01 ~ 0.08%, Ti:0.003 ~ 0.06%, H≤0.00018%, N≤0.0040%, O≤0.0030%, adopt the quenching add-back intimately to process, obtain tempered martensite.Pan Hui, Guo Jia, Zhu Guosen etc. have set forth the thermal treatment high-strength steel of a kind of 1100-1200MPa, and its chemical composition characteristics are: C:0.15～0.18%; Si:0.20-0.25%; Mn:0.85～1.25%; Cr:0.20～0.60%; Mo:0.45～0.65%; V:0.035～0.060%; Nb:0.015～0.020%; Ni:0～0.55%; Cu:0～0.035%; Al:0.01～0.06%; P :≤0.015%; S :≤0.01%; N :≤0.008%, its process characteristic is for to be heated to 1150～1250 ℃ by strand, and finishing temperature is 860～920 ℃; Coiling temperature is 650～750 ℃; Quenching temperature is 880～930 ℃, and soaking time is 20～90min, and the tempering Heating temperature is 100～450 ℃, and soaking time is greater than 90min, and slow cooling or air cooling are to room temperature.Sun Quanshe, Zhang Aiwen etc. have set forth a kind of superhigh strength steel plate with yield strength more than 1100 Mpa, and its composition characteristic is C 0.10～0.20%; Si≤0.6%; Mn 0.5～2.5%; Al≤0.03%; N 0.001～0.006 %; B 0～0.0025%; Ca 0～0.006%; P≤0.015%; S≤0.005%; More than one or more in Ni 0.2～1.2%, Cr 0～0.8%, Cu 0～0.5% and Mo 0～0.6%; More than one or more in Ti 0.01～0.03%, V 0～0.1% and Nb 0.01～0.1%; Its operational path is press quenching+off-line tempering.
In sum, super-high strength steel for intensity rank more than 1100MPa, its Composition Design and technological design are all comparatively complicated, from Composition Design, all added a large amount of alloying elements, and, for production technique, all adopt comparatively complicated thermal treatment process, obtain the 1100MPa level high-strength steel with bainite or tempered martensite.
Summary of the invention
For above technical problem, the invention provides a kind of non-quenched and tempered state hot rolled strip and preparation method for yield strength 1100MPa level engineering machinery, purpose is to design by reasonable component, and make yield strength with steel higher than 1100MPa by cooling controlling and rolling controlling process, save complicated thermal treatment process, simplify Production Flow Chart, replace hot-rolled steel sheet or the low-level Hi-Stren steel of same rank quenched and tempered state.
Yield strength 1100MPa level engineering machinery of the present invention by the chemical composition of non-quenched and tempered state hot rolled strip is by weight percentage: C 0.06 ~ 0.12%, and Si 0.10 ~ 0.30%, and Mn 1.60 ~ 2.00%, Nb 0.00 ~ 0.04%, and V 0.00 ~ 0.04%, and Ti 0.15 ~ 0.20%, Ni 0.4 ~ 0.80%, Mo 0.20 ~ 0.60%, P<0.012%, S<0.01%, surplus is iron Fe, its yield strength >=1100MPa, tensile strength >=1180MPa, elongation after fracture >=11%.
Preparation method of the present invention carries out according to the following steps:
(1) by the set component smelting molten steel and cast strand, set component is C0.06 ~ 0.12% by weight percentage, and Si 0.10 ~ 0.30%, Mn 1.60 ~ 2.00%, Nb 0.00 ~ 0.04%, V0.00 ~ 0.04%, and Ti 0.15 ~ 0.20%, Ni 0.4 ~ 0.80%, Mo 0.20 ~ 0.60%, P<0.012%, S<0.01%, surplus is iron Fe, and slab thickness is 220 ~ 250mm;
(2) strand is heated to 1220 ~ 1250 ℃, carries out 5 ~ 7 passage roughing, the roughing start rolling temperature is 1120 ~ 1170 ℃, and finishing temperature is 980 ~ 1070 ℃, the intermediate blank that acquisition thickness is 38 ~ 58mm;
(3) intermediate blank is carried out to 5 ~ 7 passage finish rolling, the finish rolling start rolling temperature is 950 ~ 1020 ℃, and finishing temperature is 800 ~ 880 ℃, and the finish rolling draught per pass is controlled at 15 ~ 40%, and after finish rolling, belt steel thickness is 2 ~ 6mm;
(4) after finish rolling, with the speed of 15 ~ 60 ℃/s, will be with steel to be cooled to 200 ~ 400 ℃, be batched, obtain the hot rolled strip product, its yield strength >=1100MPa, tensile strength >=1180MPa, elongation after fracture >=11%.
The present invention adopts the low-carbon (LC) Composition Design, by reasonable interpolation microalloy element and cooling controlling and rolling controlling process, the production yield strength is greater than 1100MPa, tensile strength is greater than 1180MPa, elongation after fracture is not less than 11%, the structure steel band that simultaneously has good use properties, its metallographic structure is the bainite/martensite tissue that crystal grain is comparatively tiny.
In the present invention steel grades arrange considered following some:
C is effectively to the strengthening steel plate, but has reduced its formability and weldability simultaneously, and these performances are absolutely necessary concerning its use properties, so the content of carbon is controlled in the soft steel scope; Mn can effectively improve by solution strengthening and phase transformation strengthening the performance of steel, but can reduce its spot welding ability and throwing power simultaneously, considers the actual use properties requirement of High Strength Steel Plate, so the content of manganese is controlled at below 2%; Si and P can improve the intensity of steel, but can reduce the throwing power of steel simultaneously, so the control of their content is very low; For on the basis of soft steel, more than yield strength is brought up to 1100MPa, added a large amount of micro-alloy element titaniums, utilize the precipitation strength effect of micro-alloy element titanium effectively to improve the performance of experimental steel, add the Mo alloying element, suppress the phase transformation of hot stage ferritic structure, improved the hardening capacity of steel, be conducive to form low temperature phase change product-bainite, martensite etc.
What the present invention prepared that the non-quenched and tempered state hot rolled strip of yield strength 1100MPa level adopts is TMCP(heat engine tool control process), according to being: by the austenite recrystallization controlled rolling of high-temperature zone, abundant refine austenite crystal grain; The finish rolling finishing temperature is controlled at 800 ~ 880 ℃, makes in the operation of rolling to produce larger accumulation strain; By rolling batching of rear fast cooling and mild temperature, obtain bainite and the martensitic heterogeneous structure of refinement;
The present invention provides a kind of new production process route to the non-quenched and tempered state hot rolled strip of yield strength 1100MPa level, cancelled the quenching-and-tempering process of these rank steel of current production, realized the minimizing of technique, product be organized as the bainite/martensite tissue, the bainite/martensite tissue of refinement makes material have higher mechanical property and good plasticity, simultaneously, because carbon content on Composition Design is lower, the welding property of material is greatly improved.
Hot rolled strip of the present invention is compared and is had following advantage with the thermal treatment high-strength steel of same intensity rank:
(1) hot rolled strip of the present invention, owing to having cancelled quenching-and-tempering process, has been realized the minimizing of technique, greatly reduces production cost, adopts hot rolled strip of the present invention, and per ton reducing costs is no less than 300 yuan, can produce very large economic benefit.
(2) adopt low carbon component route on hot rolled strip Composition Design of the present invention, on the basis that guarantees mechanical property requirements, product has welding property preferably, effectively reduces welding pre-heating temperature, has reduced cost and the difficulty of welding.
The accompanying drawing explanation
The metallographic structure figure of the hot rolled strip product that Fig. 1 is the embodiment of the present invention 1 preparation.
Embodiment
The milling train adopted in the embodiment of the present invention is the 2250mm hot continuous mill.
Embodiment 1
Press set component smelting molten steel in 150 tons of converters, and continuous casting becomes strand, its set component is C 0.06 % by weight percentage, Si 0.20%, and Mn 1.60%, and Nb 0.02%, V 0.04%, Ti 0.15%, and Ni 0.4%, and Mo 0.20%, P<0.012%, S<0.01%, surplus is iron Fe, slab thickness is 220mm.
Strand is heated to 1250 ℃, carries out roughing, rough rolling process is 5 passages, and the roughing start rolling temperature is 1170 ℃, and the roughing finishing temperature is 1070 ℃, the intermediate blank that acquisition thickness is 38mm.
Intermediate blank is carried out to finish rolling, finishing stands is 7 passages, the finish rolling start rolling temperature is 980 ℃, and two to roll temperature be 950 ℃, and three to roll temperature be 930 ℃, four to roll temperature be 890 ℃, five to roll temperature be 850 ℃, and six to roll temperature be 820 ℃, and finishing temperature is 800 ℃, the finish rolling draught per pass is controlled at 15 ~ 40%, and after finish rolling, belt steel thickness is 2mm.
After finish rolling with the speed water-cooled to 300 ℃ of 60 ℃/s, by reeling machine, batch, obtaining composition is C 0.06 % by weight percentage, and Si 0.20%, Mn 1.60%, Nb 0.02%, and V 0.04%, and Ti 0.15%, Ni 0.4%, Mo 0.20%, P<0.012%, S<0.01%, the finished product hot rolled strip that surplus is iron Fe, its metallographic structure as shown in Figure 1, is organized as tiny bainite/martensite, and mechanical experimental results is: yield strength 1150MPa, tensile strength 1250 MPa, elongation after fracture 12%, clod wash test (B=35, d=2a) is qualified.
Embodiment 2
The preparation method of strand and composition are with embodiment 1, and slab thickness is 250mm.
Rough rolling process is with embodiment 1, the intermediate blank that to obtain thickness be 58mm.
Intermediate blank is carried out to finish rolling, finishing stands is 6 passages, the finish rolling start rolling temperature is 950 ℃, two to roll temperature be 930 ℃, and three to roll temperature be 910 ℃, and four to roll temperature be 880 ℃, five to roll temperature be 850 ℃, finishing temperature is 830 ℃, and the finish rolling draught per pass is controlled at 15 ~ 40%, and after finish rolling, belt steel thickness is 6mm.
After finish rolling, with the speed water-cooled to 400 ℃ of 35 ℃/s, by reeling machine, batch, obtaining composition is C 0.06 % by weight percentage, Si 0.20%, and Mn 1.60%, and Nb 0.02%, V 0.04%, and Ti 0.15%, and Ni 0.4%, Mo 0.20%, P<0.012%, S<0.01%, the finished product hot rolled strip that surplus is iron Fe, mechanical experimental results is: yield strength 1100MPa, tensile strength 1185MPa, elongation after fracture 11.5%, clod wash test (B=35, d=2a) is qualified.
Embodiment 3
The preparation method of strand and composition are with embodiment 1, and slab thickness is 240mm.
Rough rolling process is with embodiment 1, the intermediate blank that to obtain thickness be 45mm.
Intermediate blank is carried out to finish rolling, and finishing stands is 5 passages, and the finish rolling start rolling temperature is 1020 ℃, two to roll temperature be 980 ℃, and three to roll temperature be 920 ℃, and four to roll temperature be 900 ℃, finishing temperature is 880 ℃, and the finish rolling draught per pass is controlled at 15 ~ 40%, and after finish rolling, belt steel thickness is 4mm.
After finish rolling, with the speed water-cooled to 200 ℃ of 15 ℃/s, by reeling machine, batch, obtaining composition is C 0.06 % by weight percentage, Si 0.20%, and Mn 1.60%, and Nb 0.02%, V 0.04%, and Ti 0.15%, and Ni 0.4%, Mo 0.20%, P<0.012%, S<0.01%, the finished product hot rolled strip that surplus is iron Fe, corresponding mechanical experimental results is: yield strength 1120MPa, tensile strength 1190MPa, elongation after fracture 12%, clod wash test (B=35, d=2a) is qualified.
Embodiment 4
Press set component smelting molten steel in 150 tons of converters, and continuous casting becomes strand, its composition is C 0.08% by weight percentage, Si 0.10 %, Mn 2.00%, Nb 0.00 %, V0.00 %, Ti 0.20 %, Ni 0.80%, and Mo 0.60%, P<0.012%, S<0.01%, surplus is iron Fe, slab thickness is 220mm.
Strand is heated to 1220 ℃, carries out roughing, rough rolling process is 7 passages, and the roughing start rolling temperature is 1150 ℃,
eventuallyrolling temperature is 1000 ℃, the intermediate blank that acquisition thickness is 38mm.
Intermediate blank is carried out to finish rolling, and finishing stands is 5 passages, and the finish rolling start rolling temperature is 1020 ℃, two to roll temperature be 970 ℃, and three to roll temperature be 940 ℃, and four to roll temperature be 910 ℃, finishing temperature is 880 ℃, and the finish rolling draught per pass is controlled at 15 ~ 40%, and after finish rolling, belt steel thickness is 2mm.
After finish rolling, with the speed water-cooled to 400 ℃ of 60 ℃/s, by reeling machine, batch, obtaining composition is C 0.08% by weight percentage, Si 0.10 %, Mn 2.00%, Nb 0.00 %, V 0.00 %, Ti 0.20 %, Ni 0.80%, Mo 0.60%, P<0.012%, S<0.01%, the finished product hot rolled strip that surplus is iron Fe, mechanical experimental results is: yield strength 1110MPa, tensile strength 1190MPa, elongation after fracture 11%, clod wash test (B=35, d=2a) is qualified.
Embodiment 5
The preparation method of strand and composition are with embodiment 4, and slab thickness is 230mm.
Rough rolling process is with embodiment 4, the intermediate blank that to obtain thickness be 45mm.
Intermediate blank is carried out to finish rolling, finishing stands is 6 passages, the finish rolling start rolling temperature is 970 ℃, two to roll temperature be 950 ℃, and three to roll temperature be 920 ℃, and four to roll temperature be 880 ℃, five to roll temperature be 840 ℃, finishing temperature is 820 ℃, and the finish rolling draught per pass is controlled at 15 ~ 40%, and after finish rolling, belt steel thickness is 4mm.
After finish rolling, with the speed water-cooled to 350 ℃ of 30 ℃/s, by reeling machine, batch, obtaining composition is C 0.08% by weight percentage, Si 0.10 %, Mn 2.00%, Nb 0.00 %, V 0.00 %, Ti 0.20 %, Ni 0.80%, Mo 0.60%, P<0.012%, S<0.01%, the finished product hot rolled strip that surplus is iron Fe, mechanical experimental results is: yield strength 1100MPa, tensile strength 1180 MPa, elongation after fracture 11.5%, clod wash test (B=35, d=2a) is qualified.
Embodiment 6
The preparation method of strand and composition are with embodiment 4, and slab thickness is 240mm.
Rough rolling process is with embodiment 4, the intermediate blank that to obtain thickness be 58mm.
Intermediate blank is carried out to finish rolling, and finishing stands is 5 passages, and the finish rolling start rolling temperature is 950 ℃, two to roll temperature be 930 ℃, and three to roll temperature be 900 ℃, and four to roll temperature be 850 ℃, finishing temperature is 800 ℃, and the finish rolling draught per pass is controlled at 15 ~ 40%, and after finish rolling, belt steel thickness is 6mm.
After finish rolling, with the speed water-cooled to 200 ℃ of 15 ℃/s, by reeling machine, batch, obtaining composition is C 0.08% by weight percentage, Si 0.10 %, Mn 2.00%, Nb 0.00 %, V 0.00 %, Ti 0.20 %, Ni 0.80%, Mo 0.60%, P<0.012%, S<0.01%, the finished product hot rolled strip that surplus is iron Fe, mechanical experimental results is: yield strength 1100MPa, tensile strength 1200 MPa, elongation after fracture 11.5%, clod wash test (B=35, d=2a) is qualified.
Embodiment 7
Press set component smelting molten steel in 150 tons of converters, and continuous casting becomes strand, its composition is C 0.12% by weight percentage, Si 0.30%, Mn 1.80 %, and Nb 0.04%, V 0.02%, Ti 0.18%, and Ni 0.60%, and Mo 0.40%, P<0.012%, S<0.01%, surplus is iron Fe, slab thickness is 240mm.
Strand is heated to 1240 ℃, carries out roughing, rough rolling process is 6 passages, and the roughing start rolling temperature is 1120 ℃,
eventuallyrolling temperature is 980 ℃, the intermediate blank that acquisition thickness is 42mm.
Intermediate blank is carried out to finish rolling, finishing stands is 7 passages, the finish rolling start rolling temperature is 1000 ℃, and two to roll temperature be 970 ℃, and three to roll temperature be 940 ℃, four to roll temperature be 900 ℃, five to roll temperature be 860 ℃, and six to roll temperature be 820 ℃, and finishing temperature is 800 ℃, the finish rolling draught per pass is controlled at 15 ~ 40%, and after finish rolling, belt steel thickness is 2mm.
After finish rolling, with the speed water-cooled to 400 ℃ of 60 ℃/s, by reeling machine, batch, obtaining composition is C 0.12% by weight percentage, Si 0.30%, Mn 1.80 %, and Nb 0.04%, V 0.02%, and Ti 0.18%, and Ni 0.60%, Mo 0.40%, P<0.012%, S<0.01%, the finished product hot rolled strip that surplus is iron Fe, mechanical experimental results is: yield strength 1120MPa, tensile strength 1190 MPa, elongation after fracture 12%, clod wash test (B=35, d=2a) is qualified.
Embodiment 8
The preparation method of strand and composition are with embodiment 4, and slab thickness is 240mm.
Rough rolling process is with embodiment 4, the intermediate blank that to obtain thickness be 48mm.
Intermediate blank is carried out to finish rolling, and finishing stands is 5 passages, and the finish rolling start rolling temperature is 1020 ℃, two to roll temperature be 970 ℃, and three to roll temperature be 940 ℃, and four to roll temperature be 910 ℃, finishing temperature is 880 ℃, and the finish rolling draught per pass is controlled at 15 ~ 40%, and after finish rolling, belt steel thickness is 5mm.
After finish rolling, with the speed water-cooled to 300 ℃ of 30 ℃/s, by reeling machine, batch, obtaining composition is C 0.12% by weight percentage, Si 0.30%, Mn 1.80 %, and Nb 0.04%, V 0.02%, and Ti 0.18%, and Ni 0.60%, Mo 0.40%, P<0.012%, S<0.01%, the finished product hot rolled strip that surplus is iron Fe, mechanical experimental results is: yield strength 1130MPa, tensile strength 1190 MPa, elongation after fracture 11.5%, clod wash test (B=35, d=2a) is qualified.
Embodiment 9
The preparation method of strand and composition are with embodiment 4, and slab thickness is 240mm.
Rough rolling process is with embodiment 4, the intermediate blank that to obtain thickness be 38mm.
Intermediate blank is carried out to finish rolling, finishing stands is 6 passages, the finish rolling start rolling temperature is 980 ℃, two to roll temperature be 950 ℃, and three to roll temperature be 910 ℃, and four to roll temperature be 880 ℃, five to roll temperature be 860 ℃, finishing temperature is 840 ℃, and the finish rolling draught per pass is controlled at 15 ~ 40%, and after finish rolling, belt steel thickness is 2mm.
After finish rolling, with the speed water-cooled to 200 ℃ of 40 ℃/s, by reeling machine, batch, obtaining composition is C 0.12% by weight percentage, Si 0.30%, Mn 1.80 %, and Nb 0.04%, V 0.02%, and Ti 0.18%, and Ni 0.60%, Mo 0.40%, P<0.012%, S<0.01%, the finished product hot rolled strip that surplus is iron Fe, mechanical experimental results is: yield strength 1150MPa, tensile strength 1200 MPa, elongation after fracture 12%, clod wash test (B=35, d=2a) is qualified.
Claims (2)
1. a yield strength 1100MPa level non-quenched and tempered state hot rolled strip for engineering machinery, it is characterized in that chemical composition is by weight percentage: C 0.06 ~ 0.12%, and Si 0.10 ~ 0.30%, Mn 1.60 ~ 2.00%, and Nb 0.00 ~ 0.04%, V0.00 ~ 0.04%, Ti0.15 ~ 0.20%, Ni0.4 ~ 0.80%, Mo0.20 ~ 0.60%, P<0.012%, S<0.01%, surplus is iron Fe, its yield strength >=1100MPa, tensile strength >=1180MPa, elongation after fracture >=11%.
2. the preparation method of non-quenched and tempered state hot rolled strip for a yield strength 1100MPa level engineering machinery is characterized in that carrying out according to following steps:
(1) by the set component smelting molten steel and cast strand, set component is C0.06 ~ 0.12% by weight percentage, and Si 0.10 ~ 0.30%, Mn 1.60 ~ 2.00%, Nb 0.00 ~ 0.04%, and V 0.00 ~ 0.04%, and Ti 0.15 ~ 0.20%, Ni 0.4 ~ 0.80%, Mo 0.20 ~ 0.60%, P<0.012%, S<0.01%, surplus is iron Fe, and slab thickness is 220 ~ 250mm;
(2) strand is heated to 1220 ~ 1250 ℃, carries out 5 ~ 7 passage roughing, the roughing start rolling temperature is 1120 ~ 1170 ℃, and finishing temperature is 980 ~ 1070 ℃, the intermediate blank that acquisition thickness is 38 ~ 58mm;
(3) intermediate blank is carried out to 5 ~ 7 passage finish rolling, the finish rolling start rolling temperature is 950 ~ 1020 ℃, and finishing temperature is 800 ~ 880 ℃, and the finish rolling draught per pass is controlled at 15 ~ 40%, and after finish rolling, belt steel thickness is 2 ~ 6mm;
(4) after finish rolling, with the speed of 15 ~ 60 ℃/s, will be with steel to be cooled to 200 ~ 400 ℃, and be batched, the coil of strip product after batching is directly used, its yield strength >=1100MPa, tensile strength >=1180MPa, elongation after fracture >=11%.
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| CN105256234A (en) * | 2015-10-29 | 2016-01-20 | 首钢总公司 | Low-carbon microalloyed steel, preparing method and application of low-carbon microalloyed steel, ventilator blade and ventilator |
| CN105256238A (en) * | 2015-10-27 | 2016-01-20 | 西安交通大学 | Low-carbon martensite non-quenched-and-tempered steel for automobile parts and manufacturing method for low-carbon martensite non-quenched-and-tempered steel |
| CN108486464A (en) * | 2018-03-30 | 2018-09-04 | 湖南华菱涟源钢铁有限公司 | Ferrite-based tempered steel plate with yield strength of 900MPa and production method thereof |
| CN109023105A (en) * | 2018-09-25 | 2018-12-18 | 首钢集团有限公司 | A kind of vehicle structure hot-strip and manufacturing method |
| CN110358971A (en) * | 2019-06-20 | 2019-10-22 | 天津大学 | A kind of yield strength 1300MPa grades low-carbon super-high strength steel and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105256238A (en) * | 2015-10-27 | 2016-01-20 | 西安交通大学 | Low-carbon martensite non-quenched-and-tempered steel for automobile parts and manufacturing method for low-carbon martensite non-quenched-and-tempered steel |
| CN105256234A (en) * | 2015-10-29 | 2016-01-20 | 首钢总公司 | Low-carbon microalloyed steel, preparing method and application of low-carbon microalloyed steel, ventilator blade and ventilator |
| CN108486464A (en) * | 2018-03-30 | 2018-09-04 | 湖南华菱涟源钢铁有限公司 | Ferrite-based tempered steel plate with yield strength of 900MPa and production method thereof |
| CN109023105A (en) * | 2018-09-25 | 2018-12-18 | 首钢集团有限公司 | A kind of vehicle structure hot-strip and manufacturing method |
| CN110358971A (en) * | 2019-06-20 | 2019-10-22 | 天津大学 | A kind of yield strength 1300MPa grades low-carbon super-high strength steel and preparation method thereof |
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