CN102226250A - Hot rolled steel plate with yield strength being 700MPa and preparation method thereof - Google Patents
Hot rolled steel plate with yield strength being 700MPa and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-strength hot rolled steel plate with yield strength being 700MPa. The steel plate comprises the following chemical components by weight: 0.04-0.08% of C, 0.15-0.3% of Si, 1.20-1.90% of Mn, 0.020-0.060% of Al, not more than 0.015% of P, not more than 0.0009% of S, 0.06-0.08% of Nb, 0.09-0.12% of Ti, 0.0008-0.005% of B, not more than 0.002% of O and not more than 0.004% of N. A preparation method is characterized in that the heating temperature is 1240-1260 DEG C; the rough rolling temperature is 1230-1100 DEG C; the finish rolling inlet temperature is 1080-1040 DEG C; the final rolling temperature is 820-860 DEG C; the total finish rolling reduction ratio is not less than 85%; the laminar flow is cooled at a speed being not less than 60 DEG C/s after finish rolling; and the coiling temperature is controlled between 550 DEG C and 600 DEG C.
Description
Technical field
The present invention relates to the high-strength hot-rolled automobile structure metallic substance of a kind of cold shaping, relate in particular to hot-rolled steel sheet of the above Yield strength 700 MPa of a kind of Yield strength 700 MPa and preparation method thereof.
Background technology
Development and application high-strength vehicle steel plate materials is to realize one of light-weighted major measure of automobile, general low-alloy high-strength steel mainly adopts the ferrite+pearlitic structure material of single or compound interpolation Nb, microalloy elements such as V, Ti, raising along with intensity, the forming property of material reduces, particularly when tensile strength reaches 700MPa, material stamping parts cracking ratio is very high, is difficult to satisfy the forming requirements that automobile factory produces in batches.Chinese patent 200610030713.8 discloses with Cu, Cr, Ni, Nb, Ti, Mo combined microalloying composition and has produced 700MPa weather-resistant and high-strength steel, the alloying element content height, and production cost is big.The chemical ingredients that Chinese patent 200810036415.9 discloses a kind of high-strength hot rolling automotive frame steel plate comprises: C:0.05～0.10wt%, Si≤0.10wt%, Mn:1.10～1.85wt%, P≤0.025wt%, S≤0.0030wt%, Al:0.015～0.060wt%, N≤0.0060wt%, Nb:0.015～0.050wt%, Ti:0.015～0.150wt%, Ca≤0.0050wt%, surplus is Fe and unavoidable impurities.Though alloying element content has reduced, its yield strength can only reach 550-700MPa.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of cold shaping performance, low temperature impact properties is good, need not the hot-rolled steel sheet and the manufacture method thereof of the above Yield strength 700 MPa of the good Yield strength 700 MPa of thermal treatment plate shape.
For solving the problems of the technologies described above, the invention provides a kind of hot-rolled steel sheet of Yield strength 700 MPa, it is characterized in that, its chemical component weight per-cent is: C 0.04%-0.08%, Si 0.15%-0.3%, Mn 1.20%-1.90%, Al 0.020%-0.060%, P≤0.015%, S≤0.0009%, Nb 0.06%-0.08%, Ti 0.09%-0.12%, B 0.0008%-0.005%, and O≤0.002%, N≤0.004%, surplus are Fe and unavoidable impurities element.
The present invention also provides the preparation method of the hot-rolled steel sheet of Yield strength 700 MPa, comprise continuous casting working procedure, hot continuous rolling operation, refrigerating work procedure, coiling process, it is characterized in that: described hot continuous rolling operation is: 1240 ℃～1260 ℃ of Heating temperatures, 1230 ℃～1100 ℃ of roughing temperature, 1080 ℃～1040 ℃ of finish rolling temperature ins, 820 ℃～860 ℃ of finishing temperatures, the total draft of finish rolling is more than or equal to 85%; Described refrigerating work procedure is: laminar flow cooling after the finish rolling, speed of cooling 〉=60 ℃/s; Described coiling process is: coiling temperature is being controlled at 550～600 ℃.
Specify the content of technical solution of the present invention below:
The present invention adopts above-mentioned chemical ingredients, and the manufacturing process flow process is: hot metal pretreatment → converter smelting → alloy fine setting station → LF → continuous casting → hot continuous rolling → laminar flow cools off → batches.
The present invention adopts above chemical ingredients and technical process to produce Yield strength 700 MPa cold shaping high tensile steel plate, specifically carries out according to the following steps:
(1) by the low P of hot metal pretreatment, converter smelting and LF refining and low S smelting technology and Ca treatment process, state control P and S element low levels on the basis of chemical Composition Control of C, Si, Mn, Nb, Ti in realization, make that the steel inclusion content is low and good nodularization denaturing treatment is arranged, the S too high levels, TiS is increased, reduce the precipitating reinforcing effect of the follow-up TiC of Ti.
(2) adopt the whole process protection cast, not only avoid the loss of Ti, avoid process to increase O simultaneously and increase N at casting process, in the control steel O 20ppm with interior, N in 40ppm, reduce oxide inclusion in the steel.Low N content can reduce the generation of large-sized TiN precipitation particles in the steel, helps follow-uply rolling the postcooling process and batching separating out of the annealing process following TiC of more 30nm.
Employing is fluctuateed control ± 3mm with interior steady speed pouring procedure and even process for cooling, with the strand internal soundness that obtains less than 20 ℃ low overheat cast and crystallizer molten steel surface.Slab thickness 230mm.
Strand heated in process furnace 3～4 hours, and tapping temperature is controlled at 1240 ℃～1260 ℃.Higher Heating temperature makes Nb and the effective solid solution of Ti microalloy element.
Adopt on the 2250mm hot continuous mill and carry out roughing and finish rolling, adopt 1230 ℃～1100 ℃ of high temperature rolling technology, roughing temperature ranges, 1080 ℃～1040 ℃ of finish rolling temperature ins.
Adopt stay-warm case to reduce intermediate blank head and tail temperature difference in 40 ℃ between roughing and the finish rolling, adopt limit portion induction heating that intermediate blank limit portion temperature drop is compensated, the width temperature difference is controlled in 15 ℃.Control by the intermediate blank temperature homogeneity and to guarantee of the influence of finish rolling process intermediate blank temperature head, reduce the internal residual stress that causes because of plate shape plate shape.
Determine finish rolling inlet intermediate blank thickness according to the final product thickness specification, the total draft of control finish rolling is more than or equal to 85%.
Finishing temperature is controlled at 820 ℃～860 ℃.The control of PCFC model is adopted in finish rolling, realizes rolling dimensional precision, the control of plate shape, strip crown control 40um.Finishing temperature is logical by the rolling temperature model, and realizes feedback stability control by cooling and roll speed between frame.Adopt the laminar flow type of cooling to cool off fast after the finish rolling, speed of cooling 〉=60 ℃ with the front end cooling mode.High speed of cooling increases the austenitic phase transformation condensate depression of rolling deformation, increases the phase transformation nucleation rate, organizes after the refinement phase transformation; High speed of cooling is refinement phase transformation ferrite not only, and can avoid perlite to generate; High speed of cooling promotes the supercooled austenite of the rich C of part to be transformed into martensite; Process of cooling is carried out laminar cooling water and is evenly checked, guarantees the cooling of hot-rolled sheet face evenly, avoids or reduces the even structural stress that produces because of the even tissue odds that causes of inhomogeneous cooling.
Batch after the cooling, coiling temperature is being controlled at 550～600 ℃.Bainite transformation district, coiling temperature zone promotes the part bainite transformation.Coiling temperature mainly influences the multiple strengthening effect of build up and precipitation strength.Coiling temperature is low excessively, and Nb (NC), TiC separate out and be subjected to suppress, can not give full play to the precipitation strength effect; Coiling temperature is too high, and part bainite and martensitic stucture strengthening effect reduce.Therefore coiling temperature has an optimum range.
The present invention adopts the composition design of Gao Meng, little boron to combine the cold shaping High Strength Steel Plate of producing with heavy reduction rate and quick refrigerative production technique and is organized as the island martensite body that tiny ferrite+bainite+disperse is distributed in crystal boundary, and this tissue has the matched well of high strength and high tenacity.Thickness is 5.0mm-10.0mm, and yield strength is 710MPa-760MPa, and tensile strength is 780MPa-830MPa, unit elongation A
80Be 19.0%～22%, yield tensile ratio is 0.88-0.92.
(5 * 10 * 55mm)-60 ℃ of ballistic work Akv are greater than 79J for the hot-rolled steel sheet half-size scale sample of the Yield strength 700 MPa that employing the present invention produces.
The Yield strength 700 MPa hot-rolled steel sheet plate shape of adopting the present invention to produce is good, unrelieved stress is low, does not need to carry out the unrelieved stress anneal, can be directly used in drawing after hot rolled coil aligning is opened straight snips and cut, or the hot rolled coil rip cutting becomes to cut the direct rolling forming of volume, drip molding shape and size precision height.
The heavy truck longeron is made in the Yield strength 700 MPa hot-rolled steel sheet cold shaping of adopting the present invention to produce can realize automobile chassis light-weight design and manufacturing.Can also be used for high-strength structure spares such as engineering machinery.
Embodiment
Describe the present invention in detail with 6 embodiment below.Chemical ingredients steel shown in the employing table 1 is a raw material, and continuous casting steel billet is of a size of 230mm.Strand is heated, is rolled, cools off and batch through 2250mm hot continuous rolling unit then through process furnace.Control tapping temperature, finish rolling temperature in, the total draft of finish rolling, finishing temperature, laminar flow speed of cooling and coiling temperature.Rolling thickness is 5.0mm-10mm.Rolling and process for cooling sees Table 2, and mechanical property sees Table 3.Series of temperatures impact of collision merit sees Table 4.
Table 1 embodiment chemical ingredients (weight percentage %)
| Sequence number | C | Si | Mn | P | S | Al | Nb | Ti | B |
| 1 | 0.04 | 0.30 | 1.90 | 0.010 | 0.0007 | 0.020 | 0.060 | 0.090 | 0.0008 |
| 2 | 0.052 | 0.28 | 1.83 | 0.013 | 0.0009 | 0.031 | 0.061 | 0.093 | 0.0012 |
| 3 | 0.06 | 0.25 | 1.65 | 0.011 | 0.0008 | 0.033 | 0.065 | 0.095 | 0.0023 |
| 4 | 0.065 | 0.22 | 1.45 | 0.014 | 0.0005 | 0.042 | 0.072 | 0.10 | 0.0031 |
| 5 | 0.071 | 0.17 | 1.31 | 0.012 | 0.0006 | 0.051 | 0.076 | 0.12 | 0.0045 |
| 6 | 0.08 | 0.15 | 1.20 | 0.009 | 0.0008 | 0.060 | 0.080 | 0.11 | 0.005 |
Rolling and the process for cooling parameter of table 2 embodiment
Table 3 embodiment mechanical property
| Sequence number | Rp 0.2(MPa) | Rm(Mpa) | Rp 0.2/Rm | A 80(％) |
| 1 | 715 | 812 | 0.88 | 22.0 |
| 2 | 717 | 805 | 0.89 | 21.0 |
| 3 | 720 | 800 | 0.90 | 20.5 |
| 4 | 724 | 795 | 0.91 | 20.0 |
| 5 | 730 | 793 | 0.92 | 19.5 |
| 6 | 754 | 820 | 0.92 | 19.0 |
Wherein: Rp
0.2-yield strength; Rm-tensile strength; Rp
0.2/ Rm-yield tensile ratio;
A
80-gauge length is the elongation after fracture of 80mm.
Table 4 embodiment impact of collision merit
Claims (10)
1. the hot-rolled steel sheet of a Yield strength 700 MPa, it is characterized in that, its chemical component weight per-cent is: C0.04%-0.08%, Si 0.15%-0.3%, Mn 1.20%-1.90%, Al 0.020%-0.060%, P≤0.015%, S≤0.0009%, Nb 0.06%-0.08%, Ti 0.09%-0.12%, B 0.0008%-0.005%, and O≤0.002%, N≤0.004%, surplus are Fe and unavoidable impurities element.
2. the hot-rolled steel sheet of Yield strength 700 MPa as claimed in claim 1, it is characterized in that, its chemical component weight per-cent is: C 0.04%-0.065%, Si 0.22%-0.3%, Mn 1.45%-1.90%, Al 0.020%-0.042%, P≤0.015%, S≤0.0009%, Nb 0.06%-0.72%, Ti 0.09%-0.10%, B 0.0008%-0.0031%.
3. the hot-rolled steel sheet of Yield strength 700 MPa as claimed in claim 1 or 2, it is characterized in that, its chemical component weight per-cent is: C 0.06%, Si 0.25%, Mn 1.65%, Al 0.033%, P≤0.015%, S≤0.0009%, Nb 0.065%, Ti 0.095%, Mo 0.0023%.
4. the hot-rolled steel sheet of Yield strength 700 MPa as claimed in claim 1 is characterized in that, the metal structure of described steel plate is ferrite+bainite+a small amount of island martensite body, and described island martensite body distributes in the crystal boundary disperse.
5. preparation method of the hot-rolled steel sheet of Yield strength 700 MPa according to claim 1, comprise continuous casting working procedure, hot continuous rolling operation, refrigerating work procedure, coiling process, it is characterized in that: described hot continuous rolling operation is: 1240 ℃～1260 ℃ of Heating temperatures, 1230 ℃～1100 ℃ of roughing temperature, 1080 ℃～1040 ℃ of finish rolling temperature ins, 820 ℃～860 ℃ of finishing temperatures, the total draft of finish rolling 〉=85%; Described refrigerating work procedure is: laminar flow cooling after the finish rolling, speed of cooling 〉=60 ℃/s; Described coiling process is: coiling temperature is being controlled at 550～600 ℃.
6. as the preparation method of the hot-rolled steel sheet of Yield strength 700 MPa as described in the claim 5, it is characterized in that: described continuous casting working procedure is: adopt the whole process protection cast, in the control steel O 20ppm with interior, N in 40ppm; The casting process temperature is less than 20 ℃, in the crystallizer molten steel surface fluctuation control ± 3mm.
7. as the preparation method of the hot-rolled steel sheet of Yield strength 700 MPa as described in the claim 5, it is characterized in that: adopt the stay-warm case insulation in the described hot continuous rolling operation between roughing and the finish rolling.
8. as the preparation method of the hot-rolled steel sheet of Yield strength 700 MPa as described in claim 5 or 7, it is characterized in that: adopt limit portion induction heating that intermediate blank limit portion temperature drop is compensated in the described hot continuous rolling operation between roughing and the finish rolling.
9. as the preparation method of the hot-rolled steel sheet of Yield strength 700 MPa as described in the claim 8, it is characterized in that: the control of PCFC model is adopted in finish rolling in the described hot continuous rolling operation.
10. as the preparation method of the hot-rolled steel sheet of Yield strength 700 MPa as described in the claim 5, it is characterized in that: the front end cooling mode is adopted in the laminar flow cooling in the described refrigerating work procedure.
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Cited By (13)
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| CN102409233A (en) * | 2011-11-03 | 2012-04-11 | 首钢总公司 | Low-temperature steel for engineering machinery and production method thereof |
| CN102676949A (en) * | 2012-03-08 | 2012-09-19 | 江苏沙钢集团有限公司 | Hot-rolled steel plate for coal slurry conveying pipe and manufacturing method thereof |
| CN103031419A (en) * | 2012-12-24 | 2013-04-10 | 首钢总公司 | Method for improving performance uniformity of steel roll of Ti microalloyed high strength machinery |
| CN103160738A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Low-cost boron-containing steel and manufacturing method thereof |
| CN103243262A (en) * | 2013-05-15 | 2013-08-14 | 攀钢集团攀枝花钢铁研究院有限公司 | High-strength hot rolled steel plate roll for automobile wheels as well as preparation method thereof |
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| CN102409233A (en) * | 2011-11-03 | 2012-04-11 | 首钢总公司 | Low-temperature steel for engineering machinery and production method thereof |
| CN103160738A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Low-cost boron-containing steel and manufacturing method thereof |
| CN103160738B (en) * | 2011-12-14 | 2015-09-02 | 鞍钢股份有限公司 | A kind of low cost boron-containing steel and manufacture method thereof |
| CN102676949A (en) * | 2012-03-08 | 2012-09-19 | 江苏沙钢集团有限公司 | Hot-rolled steel plate for coal slurry conveying pipe and manufacturing method thereof |
| CN104583444B (en) * | 2012-08-21 | 2016-09-21 | 新日铁住金株式会社 | Steel |
| CN104583444A (en) * | 2012-08-21 | 2015-04-29 | 新日铁住金株式会社 | Steel material |
| CN103031419A (en) * | 2012-12-24 | 2013-04-10 | 首钢总公司 | Method for improving performance uniformity of steel roll of Ti microalloyed high strength machinery |
| CN103243262A (en) * | 2013-05-15 | 2013-08-14 | 攀钢集团攀枝花钢铁研究院有限公司 | High-strength hot rolled steel plate roll for automobile wheels as well as preparation method thereof |
| CN103911544B (en) * | 2014-04-23 | 2016-03-30 | 武汉钢铁(集团)公司 | Low cost thick specification low-alloy structure and production method thereof |
| CN103911544A (en) * | 2014-04-23 | 2014-07-09 | 武汉钢铁(集团)公司 | Low alloy structural steel with low cost and thick specification and production method thereof |
| CN105543680A (en) * | 2015-12-21 | 2016-05-04 | 秦皇岛首秦金属材料有限公司 | Micro-boron treatment wide and thick plate with tensile strength grade of 700MPa and production method of wide and thick plate |
| CN105543680B (en) * | 2015-12-21 | 2018-01-05 | 秦皇岛首秦金属材料有限公司 | Micro- boron processing tensile strength 700MPa levels Wide and Thick Slab and manufacture method |
| CN106834948A (en) * | 2017-03-03 | 2017-06-13 | 内蒙古包钢钢联股份有限公司 | Longitudinal yield strength 700MPa grades of hot rolled strip and preparation method thereof |
| CN107043890A (en) * | 2017-03-28 | 2017-08-15 | 马钢(集团)控股有限公司 | A kind of 1.5~3.0mm of thickness yield strengths are more than 700MPa Hot Rolling Automobile steel and its manufacture method |
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| CN109402353A (en) * | 2018-10-31 | 2019-03-01 | 邯郸钢铁集团有限责任公司 | A kind of method that compressor case is controlled with steel close limit hardness |
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| CN113201688A (en) * | 2021-04-22 | 2021-08-03 | 日照钢铁控股集团有限公司 | 700 MPa-grade thick-specification high-strength steel and production method thereof |
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| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 243003 8 Jiuhua Road, Yushan, Ma'anshan, Anhui Patentee after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 intellectual property department, technology center, No. 8 Hunan West Road, Yushan, Ma'anshan, Anhui Patentee before: Ma'anshan Iron and Steel Co., Ltd. |
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| CP02 | Change in the address of a patent holder |