CN103088255B - Manufacturing process of automobile low-alloy high-strength steel cold-rolled sheet with high product of strength and elongation - Google Patents
Manufacturing process of automobile low-alloy high-strength steel cold-rolled sheet with high product of strength and elongation Download PDFInfo
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- CN103088255B CN103088255B CN201310000272.7A CN201310000272A CN103088255B CN 103088255 B CN103088255 B CN 103088255B CN 201310000272 A CN201310000272 A CN 201310000272A CN 103088255 B CN103088255 B CN 103088255B
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Abstract
The invention relates to a manufacturing process of an automobile low-alloy high-strength steel cold-rolled sheet with high product of strength and elongation, and belongs to the technical field of metallurgy. The technical scheme of the invention is as follows: the manufacturing process comprises a smelting process, a hot rolling process and a cold rolling process, wherein in the cold rolling process, the annealing temperature control is as follows: the soaking temperature is 840-860 DEG C, the slow cooling temperature is 670-700 DEG C, the rapid cooling temperature is 410-430 DEG C, and the aging finish temperature is 350-370 DEG C; and according to strip steel of different thickness specifications, different annealing tape speed target values are planed: the tape speed of the strip steel of 0.8mm specification is 205m/min, the tape speed of the strip steel of 1.0mm specification is 165m/min, the tape speed of the strip steel of 1.2mm specification is 137m/min, the tape speed of the strip steel of 1.5mm specification is 110m/min, the tape speed of the strip steel of 1.8mm specification is 92m/min, the tape speed of the strip steel of 2.0mm specification is 82m/min, and the tape speed of the strip steel of 2.5mm specification is 66m/min. The manufacturing process of the automobile low-alloy high-strength steel cold-rolled sheet with the high product of strength and elongation disclosed by the invention has the beneficial effects that the low-alloy high-strength steel cold-rolled sheet with high product of strength and elongation is produced by modifying the chemical elements and optimizing the hot rolling and cold rolling processes so that the product of strength and elongation of the low-alloy high-strength steel cold-rolled sheet reach 15GPa%, and simultaneously the quality is stably controlled.
Description
Technical field
The production technique that the present invention relates to the low-alloy high-strength steel cold-reduced sheet of a kind of automobile high strength and ductility, belongs to metallurgical technology field.
Background technology
Along with the development of automobile industry, the kind of domestic low and middle-grade cars, commercial truck and output are more and more.For above-mentioned automobile, due to its cost restriction, the parts that its structural part, stiffener equal strength are had relatively high expectations seldom adopt the steel grades such as advanced high-strength steel DP, TRIP, mainly adopt low-alloy high-strength steel cold-reduced sheet.But general low-alloy high-strength steel strength and ductility product only has 12GPa% left and right, when intensity is brought up to 500MPa when above, unit elongation is very low, while producing the structural part that is shaped complicated a little, mechanical property surplus capacity is very low, can not meet the special requirement of low and middle-grade cars, commercial truck, therefore be necessary to study a kind of low-alloy high-strength steel of high strength and ductility.
Summary of the invention
The object of the invention is to provide the production technique of the low-alloy high-strength steel cold-reduced sheet of a kind of automobile high strength and ductility, by chemical composition is modified, optimize hot rolling, cold-rolling process, produce the low-alloy high-strength steel cold-reduced sheet of high strength and ductility, make steady quality control simultaneously, solve the problems referred to above that background technology exists.
Technical scheme of the present invention is: the production technique of the low-alloy high-strength steel cold-reduced sheet of high strength and ductility for a kind of automobile, comprise smelting, hot rolling, cold rolling process, and low-alloy high-strength steel adopts the mass percent of chemical composition to be: C:0.05%-0.08%; Si:0.25%～0.35%; Mn:0.85%～0.95%; S≤0.008%; P≤0.015%; Ti:0.005%～0.02%; Nb:0.04%～0.05%; All the other are Fe; In described cold rolling process, it is as follows that temperature control is moved back by company: soaking temperature: 840～860 DEG C; Slow cooling temperature: 670～700 DEG C; Rapid cooling temperature: 410～430 DEG C; Completion of prescription temperature: 350～370 DEG C; According to the band steel of thickness different size, formulate different companies and moved back belt speed target value: specification 0.8mm belt speed has been 205m/min, specification 1.0mm belt speed is 165m/min, specification 1.2mm belt speed is 137m/min, specification 1.5mm belt speed is 110m/min, specification 1.8mm belt speed is 92m/min, and specification 2.0mm belt speed is 82m/min, and specification 2.5mm belt speed is 66 m/min.
For the stability of guaranteed performance, the company of requirement moves back belt speed fluctuation range and is ± 10m/min.
Described smelting procedure, except obtaining aforesaid chemical composition, also needs to make molten steel pure, comprises the following steps:
(1) converter adopts the blowing pattern that top rifle oxygen blast, omnidistance furnace bottom blowing argon gas stir, and converting process adds the slag materials such as lime, full range slag, and basicity of slag is controlled at 4.0～4.5; Blow off control target: [C]≤0.05%, [P] < 0.007%, [S]≤0.025%, [N]≤20ppm;
(2) converter tapping adopts the dual pushing off the slag technique in front and back, and the slag amount of controlling in tapping process inflow ladle is less than 0.8%, mass ratio with the ratio of molten steel amount;
(3) in LF stove refining process, add lime, magnalium calcium iron to carry out slag making deoxidation, desulfurization operations, require slag making target: in slag, FeO+MnO mass percent content is less than 1.0%; The ratio of refining process argon bottom-blowing flow and molten steel amount is 0.3～1.8Nl/ (min.t), keeps pressure-fired in stove; Add ferro-niobium, ferrotianium, electrolytic manganese to adjust molten steel composition;
(4) LF calcium processing, calcium is processed the rear clean blowing argon gas churning time of molten steel 5～12 minutes, and the ratio of clean blowing argon gas flow and molten steel amount is controlled at 0.1～1.0Nl/ (min.t).It is liquidus temperature+30～50 DEG C that calcium is processed rear liquid steel temperature;
(5) LF processes to end and requires: [S]≤0.008%, [Als]=400～450ppm in molten steel composition, and the content of carbon, silicon, manganese, phosphorus, niobium, titanium meets Composition Design requirement;
(6) cast follows that high temperature is poured into a mould at a slow speed, the principle of low temperature Quick pouring, and pouring molten steel temperature is liquidus temperature+15-30 DEG C; Note fast span of control 0.9～1.4 m/min.
Described steel rolling process heats the slab of aforementioned composition at 1200～1240 DEG C of temperature, and hot rolling finishing temperature is controlled within the scope of 840～860 DEG C, and batches in 540～570 DEG C of temperature ranges; After hot rolling, be with steel to roll through peracid, be rolled into the thickness needing; Follow the difference according to thickness specification, acid is rolled and is moved back belt speed with steel with different companies and connected and moved back stove by 709m afterwards, by complete radiator tube gradient-heated to 840～860 DEG C, after the insulation of 250m soaking zone, pass through air-cooled section quenching to 670～700 DEG C of 70m, then be cooled to 410～430 DEG C by 16m rapid cooling section; Then carry out ageing treatment by the overaging section of 921m, completion of prescription temperature is 350～370 DEG C.
Beneficial effect of the present invention: by chemical composition is modified, optimize hot rolling, cold-rolling process, produce the low-alloy high-strength steel cold-reduced sheet of high strength and ductility, make this low-alloy high-strength steel cold-reduced sheet strength and ductility product reach 15GPa%, make steady quality control simultaneously.
Embodiment
The present invention will be further described by the following examples.
A production technique for the low-alloy high-strength steel cold-reduced sheet of high strength and ductility for automobile, comprises smelting, hot rolling, cold rolling process, and low-alloy high-strength steel adopts the mass percent of chemical composition to be: C:0.05%-0.08%; Si:0.25%～0.35%; Mn:0.85%～0.95%; S≤0.008%; P≤0.015%; Ti:0.005%～0.02%; Nb:0.04%～0.05%; All the other are Fe.
Described smelting procedure, except obtaining aforesaid chemical composition, also needs to make molten steel pure, comprises the following steps:
(1) converter adopts the blowing pattern that top rifle oxygen blast, omnidistance furnace bottom blowing argon gas stir, and converting process adds the slag materials such as lime, full range slag, and basicity of slag is controlled at 4.0～4.5; Blow off control target: [C]≤0.05%, [P] < 0.007%, [S]≤0.025%, [N]≤20ppm;
(2) converter tapping adopts the dual pushing off the slag technique in front and back, and the slag amount of controlling in tapping process inflow ladle is less than 0.8%, mass ratio with the ratio of molten steel amount.
(3) in LF stove refining process, add lime, magnalium calcium iron to carry out slag making deoxidation, desulfurization operations, require slag making target: in slag, FeO+MnO mass percent content is less than 1.0%; The ratio of refining process argon bottom-blowing flow and molten steel amount is 0.3～1.8Nl/ (min.t), keeps pressure-fired in stove; Add ferro-niobium, ferrotianium, electrolytic manganese to adjust molten steel composition;
(4) LF calcium processing, calcium is processed the rear clean blowing argon gas churning time of molten steel 5～12 minutes, and the ratio of clean blowing argon gas flow and molten steel amount is controlled at 0.1～1.0Nl/ (min.t); It is liquidus temperature+30～50 DEG C that calcium is processed rear liquid steel temperature;
(5) LF processes to end and requires: [S]≤0.008%, [Als]=400～450ppm in molten steel composition, and the content of carbon, silicon, manganese, phosphorus, niobium, titanium meets Composition Design requirement;
(6) cast follows that high temperature is poured into a mould at a slow speed, the principle of low temperature Quick pouring, and pouring molten steel temperature is liquidus temperature+15-30 DEG C; Note fast span of control 0.9～1.4 m/min.
Described steel rolling process heats the slab of aforementioned composition at 1200～1240 DEG C of temperature, and hot rolling finishing temperature is controlled within the scope of 840～860 DEG C, and batches in 540～570 DEG C of temperature ranges; After hot rolling, be with steel to roll through peracid, be rolled into the thickness needing; Follow the difference according to thickness specification, acid is rolled and is moved back belt speed with steel with different companies and connected and moved back stove by 709m afterwards, by complete radiator tube gradient-heated to 840～860 DEG C, after the insulation of 250m soaking zone, pass through air-cooled section quenching to 670～700 DEG C of 70m, then be cooled to 410～430 DEG C by 16m rapid cooling section; Then carry out ageing treatment by the overaging section of 921m, completion of prescription temperature is 350～370 DEG C.
Connect and move back in stove, different thickness gauge strip steel heating efficiency difference, desired belt speed is also different.According to Gleeble3500 thermal simulation experiment result and actual industrial trial-production situation, according to the band steel of width different size, formulate different companies and moved back belt speed target value: 0.8mm belt speed has been 205m/min, 1.0mm belt speed is 165m/min, 1.2mm belt speed is 137m/min, and 1.5mm belt speed is 110m/min, and 1.8mm belt speed is 92m/min, 2.0mm belt speed is 82m/min, and 2.5mm belt speed is 66 m/min.For the stability of guaranteed performance, the company of requirement moves back belt speed fluctuation range and is ± 10m/min.
Be the chemical component table of three embodiment of the present invention below, hot rolling, cold-rolling process table, mechanical property table.
(1) the low-alloy high-strength steel cold-reduced sheet chemical composition of the embodiment of the present invention is in table 1.
The actual chemical composition of table 1 low-alloy high-strength steel cold-reduced sheet (Wt%)
| ? | C | Si | Mn | P | S | Ti | Nb |
| Embodiment 1 | 0.067 | 0.30 | 0.91 | 0.014 | 0.002 | 0.012 | 0.045 |
| Embodiment 2 | 0.067 | 0.30 | 0.91 | 0.014 | 0.002 | 0.012 | 0.045 |
| Embodiment 3 | 0.070 | 0.28 | 0.89 | 0.012 | 0.003 | 0.013 | 0.043 |
(2) low-alloy high-strength steel cold-reduced sheet of the present invention hot rolling, cold-rolling process are in table 2.
The actual hot rolling of table 2 low-alloy high-strength steel cold-reduced sheet, cold-rolling process
| Reel number | Heating temperature DEG C | Finishing temperature DEG C | Coiling temperature DEG C | Cold rolling thickness mm | Connect and move back Heating temperature DEG C | Slow cooling temperature DEG C | Rapid cooling temperature DEG C | Connect and move back belt speed m/min |
| Embodiment 1 | 1224 | 864 | 548 | 1.0 | 850 | 690 | 420 | 159 |
| Embodiment 2 | 1224 | 860 | 563 | 2.0 | 860 | 700 | 425 | 83 |
| Embodiment 3 | 1223 | 846 | 562 | 2.5 | 847 | 669 | 420 | 65 |
(3) product mechanical property
According to the low-alloy high-strength steel mechanical property of the rolling technique rolling as table 3.
Table 3 low-alloy high-strength steel mechanical property
| Example | Thickness (mm) | Yield strength (MPa) | Tensile strength (MPa) | Unit elongation A 80mm（%） | Strength and ductility product GPa% |
| Embodiment 1 | 1.0 | 395 | 505 | 29 | 14.6 |
| Embodiment 2 | 2.0 | 410 | 495 | 30 | 14.9 |
| Embodiment 3 | 2.5 | 405 | 505 | 30 | 15.2 |
Tensile strength average of the present invention is 502MPa, and unit elongation average is 30%, and strength and ductility product mean value reaches 15 GPa%.
Claims (3)
1. a production technique for the low-alloy high-strength steel cold-reduced sheet of high strength and ductility for automobile, is characterized in that: comprise smelting, hot rolling, cold rolling process, low-alloy high-strength steel adopts the mass percent of chemical composition to be: C:0.05%-0.08%; Si:0.25%～0.35%; Mn:0.85%～0.95%; S≤0.008%; P≤0.015%; Ti:0.005%～0.02%; Nb:0.04%～0.05%; All the other are Fe; In described cold rolling process, it is as follows that temperature control is moved back by company: soaking temperature: 840～860 DEG C; Slow cooling temperature: 670～700 DEG C; Rapid cooling temperature: 410～430 DEG C; Completion of prescription temperature: 350～370 DEG C; According to the band steel of thickness different size, formulate different companies and moved back belt speed target value: specification 0.8mm belt speed has been 205m/min, specification 1.0mm belt speed is 165m/min, specification 1.2mm belt speed is 137m/min, specification 1.5mm belt speed is 110m/min, specification 1.8mm belt speed is 92m/min, and specification 2.0mm belt speed is 82m/min, and specification 2.5mm belt speed is 66 m/min;
Described hot rolling, cold rolling process heat the slab of aforementioned composition at 1200～1240 DEG C of temperature, and hot rolling finishing temperature is controlled within the scope of 840～860 DEG C, and batch in 540～570 DEG C of temperature ranges.
2. the production technique with the low-alloy high-strength steel cold-reduced sheet of high strength and ductility according to a kind of automobile described in claim 1, is characterized in that described smelting procedure, except obtaining aforesaid chemical composition, also needs to make molten steel pure, comprises the following steps:
(1) converter adopts the blowing pattern that top rifle oxygen blast, omnidistance furnace bottom blowing argon gas stir, and converting process adds lime slag material, full range slag, and basicity of slag is controlled at 4.0～4.5; Blow off control target: [C]≤0.05%, [P] < 0.007%, [S]≤0.025%, [N]≤20ppm;
(2) converter tapping adopts the dual pushing off the slag technique in front and back, and the slag amount of controlling in tapping process inflow ladle is less than 0.8%, mass ratio with the ratio of molten steel amount;
(3) in LF stove refining process, add lime, magnalium calcium iron to carry out slag making deoxidation, desulfurization operations, require slag making target: in slag, FeO+MnO mass percent content is less than 1.0%; The ratio of refining process argon bottom-blowing flow and molten steel amount is 0.3～1.8Nl/ (min.t), keeps pressure-fired in stove; Add ferro-niobium, ferrotianium, electrolytic manganese to adjust molten steel composition;
(4) LF calcium processing, calcium is processed the rear clean blowing argon gas churning time of molten steel 5～12 minutes, and the ratio of clean blowing argon gas flow and molten steel amount is controlled at 0.1～1.0Nl/ (min.t); It is liquidus temperature+30～50 DEG C that calcium is processed rear liquid steel temperature;
(5) LF processes to end and requires: [S]≤0.008%, [Als]=400～450ppm in molten steel composition, and the content of carbon, silicon, manganese, phosphorus, niobium, titanium meets Composition Design requirement;
(6) cast follows that high temperature is poured into a mould at a slow speed, the principle of low temperature Quick pouring, and pouring molten steel temperature is liquidus temperature+15-30 DEG C; Note fast span of control 0.9～1.4 m/min.
3. the production technique of the low-alloy high-strength steel cold-reduced sheet of high strength and ductility for a kind of automobile according to claim 1 and 2, is characterized in that being with steel to roll through peracid after hot rolling, is rolled into the thickness needing; According to the difference of thickness specification, acid is rolled and is moved back belt speed with steel with different companies and connected and moved back stove by 709m afterwards, by complete radiator tube gradient-heated to 840～860 DEG C, after the insulation of 250m soaking zone, pass through air-cooled section quenching to 670～700 DEG C of 70m, then be cooled to 410～430 DEG C by 16m rapid cooling section; Then carry out ageing treatment by the overaging section of 921m, completion of prescription temperature is 350～370 DEG C.
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| CN106929632A (en) * | 2017-01-17 | 2017-07-07 | 唐山钢铁集团有限责任公司 | The method that the low-carbon low-silicon cold rolled steel of LF refining SPHC improves silicon hit rate |
| CN109338061B (en) * | 2018-11-09 | 2020-05-01 | 唐山钢铁集团有限责任公司 | Production method of high-corrosion-resistance continuous annealing low-alloy high-strength steel strip |
Citations (3)
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|---|---|---|---|---|
| EP0535238A1 (en) * | 1991-03-13 | 1993-04-07 | Kawasaki Steel Corporation | High-strength steel sheet for forming and production thereof |
| CN102732786A (en) * | 2012-06-19 | 2012-10-17 | 马钢(集团)控股有限公司 | Economical-type 540MPa-grade ferrite bainite hot-rolled dual-phase steel and production method thereof |
| CN102758131A (en) * | 2012-06-18 | 2012-10-31 | 河北钢铁股份有限公司邯郸分公司 | Production method of 600MPa grade cold rolling dual-phase steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3879440B2 (en) * | 2001-06-07 | 2007-02-14 | Ｊｆｅスチール株式会社 | Manufacturing method of high strength cold-rolled steel sheet |
| JP4530606B2 (en) * | 2002-06-10 | 2010-08-25 | Ｊｆｅスチール株式会社 | Manufacturing method of ultra-high strength cold-rolled steel sheet with excellent spot weldability |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0535238A1 (en) * | 1991-03-13 | 1993-04-07 | Kawasaki Steel Corporation | High-strength steel sheet for forming and production thereof |
| CN102758131A (en) * | 2012-06-18 | 2012-10-31 | 河北钢铁股份有限公司邯郸分公司 | Production method of 600MPa grade cold rolling dual-phase steel |
| CN102732786A (en) * | 2012-06-19 | 2012-10-17 | 马钢(集团)控股有限公司 | Economical-type 540MPa-grade ferrite bainite hot-rolled dual-phase steel and production method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 《冷连轧机动态变规格机架速度控制策略及规律》;周富强等;《北京科技大学学报》;20071031;第29卷(第10期);第1037-1040页 * |
| JP特开2002-363649A 2002.12.18 * |
| 周富强等.《冷连轧机动态变规格机架速度控制策略及规律》.《北京科技大学学报》.2007,第29卷(第10期),第1037-1040页. * |
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