CN102912226A - Secondary work brittleness resistant DC06 automotive steel and production method thereof - Google Patents
Secondary work brittleness resistant DC06 automotive steel and production method thereof Download PDFInfo
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- CN102912226A CN102912226A CN2012103954582A CN201210395458A CN102912226A CN 102912226 A CN102912226 A CN 102912226A CN 2012103954582 A CN2012103954582 A CN 2012103954582A CN 201210395458 A CN201210395458 A CN 201210395458A CN 102912226 A CN102912226 A CN 102912226A
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Abstract
The invention discloses secondary work brittleness resistant DC06 automotive steel, belonging to the technical field of steel products. The automotive steel comprises the following components in percentages by weight: 0.0008%-0.003% of C, 0.06-0.1% of Mn, not more than 0.01% of Si, not more than 0.008% of P, not more than 0.009% of S, 0.02%-0.05% of Als, 0.002%-0.003% of N, 0.0003%-0.0009% of B, 0.05%-0.09% of Ti and the balance of Fe. The invention further discloses a production method of the automotive steel. According to the automotive steel and the production method thereof provided by the invention, through adjusting contents of P and B, and optimizing hot rolling, cold rolling and continuous annealing processes, the produced DC06 has the characteristics of high forming performance and high secondary work brittleness resistance, and is capable of improving the product quality and bringing considerable economic benefit.
Description
Technical field
The present invention relates to the steel technical field, particularly a kind of DC06 automotive sheet and production method thereof with anti-secondary processing brittleness.
Background technology
DC06 belongs to the IF steel, is a kind of automobile mild steel commonly used, in the prior art, mainly is to adopt the method for continuous annealing to produce.Because the yield strength of DC06 is low, unit elongation is high, the r value is high, forming property is good, multiplex in the complicated formation of parts of automobile and inner panel, the outside plate of car.Europe superscript EN10130, the composition of 2006 couples of DC06 require to be C≤0.02%, Mn≤0.25%, P≤0.02%, S≤0.02%, Ti≤0.3%; Performance requriements to DC06 is Re≤170MPa, 270≤Rm≤330MPa, A80 〉=41%, r90 〉=2.1, n90 〉=0.22.
DC06 adopts Ti or Nb or Nb+Ti to fix C, the N interstitial atom of solid solution in process of production usually, thereby make DC06 have good punching performance, because the DC06 crystal boundary does not have solid solution C and N, cause its grain-boundary strength low, fracture very easily, the P element is very easily at Grain Boundary Segregation, especially under the high-speed low temperature after the initial cold working impacts, and easily embrittlement.
Summary of the invention
In order to address the above problem, the present invention proposes the rational anti-secondary processing brittleness DC06 automobile steel of a kind of composition, and, thereby the production method that obtains being conducive to deep-draw texture and strengthen the anti-secondary processing brittleness DC06 automobile steel of crystal boundary by control hot rolling technology, cold-rolling process, annealing process.
Anti-each constituent mass percentage composition of secondary processing brittleness DC06 automobile steel provided by the invention comprises: C:0.0008-0.003%, Mn:0.06-0.1%, Si :≤0.01%, P :≤0.008%, S :≤0.009%, Als:0.02-0.05%, N:0.002 ~ 0.003%, B:0.0003 ~ 0.0009%, Ti:0.05 ~ 0.09%, surplus is Fe.
The production method of anti-secondary processing brittleness DC06 automobile steel provided by the invention comprises hot rolling, cold rolling, annealing, and in the described course of hot rolling, Heating temperature is 1250 ± 30 ℃, and finishing temperature is 930 ± 20 ℃, and coiling temperature is 710 ± 20 ℃.
As preferably, in the described cold-rolled process, draft is 75～85%.
As preferably, in the described annealing process, the heating zone temperature is 850 ± 10 ℃, the soaking zone temperature is 850 ± 10 ℃, and it is 850 ± 10 ℃ that slow cooling forges mouthful temperature, and fast cold section temperature out is 420 ± 10 ℃, the overaging temperature is 360 ± 10 ℃, temperature out is 150 ± 10 ℃, and soaking time is 50～100s, and the speed of cooling of slow cooling section is 3 ~ 15 ℃/s; Fast cold section speed of cooling: 30 ~ 100 ℃/s.
Anti-secondary processing brittleness DC06 automobile steel provided by the invention has carried out strict control to P constituent content and B constituent content, the minimizing of P constituent content can reduce the fragility of Finished Steel, and the B element can reduce the fragility of Finished Steel at crystal boundary and P element competitive precipitation.The production method balance hot rolling reeling temperature of anti-secondary processing brittleness DC06 automobile steel provided by the invention, improve the annealing soaking temperature, reduce the fast cold section temperature out of annealing, and, the method has moderately reduced coiling temperature, can avoid crystal grain too thick, and keep a small amount of solid solution C atom to strengthen crystal boundary, the dissolving that keeps high soaking temperature can improve forming property and carbide in the method annealing process procedure, then reduce fast cold temperature out and can guarantee that separating out tiny second at crystal boundary in process of cooling is on good terms the increasing Grain-boundary Junctions with joint efforts, improves anti-secondary processing brittleness.
Anti-secondary processing brittleness DC06 automobile steel provided by the invention and production method thereof are by adjusting P, B content and hot rolling, cold rolling and continuous annealing process being optimized, the DC06 that produces has the characteristics of high formability energy and high resistance secondary processing brittleness, improve quality product, can bring considerable economic benefit.
Description of drawings
Fig. 1 organizes photo for the scanning electron microscope of the anti-secondary processing brittleness DC06 automobile steel that the embodiment of the invention provides.
Embodiment
In order to understand the present invention in depth, the present invention is described in detail below in conjunction with drawings and the specific embodiments.
Embodiment 1～8
The B, P content and the processing parameter that provide according to table 1 can be produced has the one to one anti-secondary processing brittleness DC06 automobile steel of Finished Steel character, and its scanning electron microscope organizes photo as shown in Figure 1.
The B of table 1 embodiment 1～8, P content, processing parameter and Finished Steel character
Anti-secondary processing brittleness DC06 automobile steel provided by the invention has carried out strict control to P constituent content and B constituent content, the minimizing of P constituent content can reduce the fragility of Finished Steel, and the B element can reduce the fragility of Finished Steel at crystal boundary and P element competitive precipitation.The production method balance hot rolling reeling temperature of anti-secondary processing brittleness DC06 automobile steel provided by the invention, improve the annealing soaking temperature, reduce the fast cold section temperature out of annealing, and, the method has moderately reduced coiling temperature, can avoid crystal grain too thick, and keep a small amount of solid solution C atom to strengthen crystal boundary, the dissolving that keeps high soaking temperature can improve forming property and carbide in the method annealing process procedure, then reduce fast cold temperature out and can guarantee that separating out tiny second at crystal boundary in process of cooling is on good terms the increasing Grain-boundary Junctions with joint efforts, improves anti-secondary processing brittleness.
Anti-secondary processing brittleness DC06 automobile steel provided by the invention and production method thereof are by adjusting P, B content and hot rolling, cold rolling and continuous annealing process being optimized, the DC06 that produces has the characteristics of high formability energy and high resistance secondary processing brittleness, improve quality product, can bring considerable economic benefit.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. anti-secondary processing brittleness DC06 automobile steel, it is characterized in that each constituent mass percentage composition comprises: C:0.0008-0.003%, Mn:0.06-0.1%, Si :≤0.01%, P :≤0.008%, S :≤0.009%, Als:0.02-0.05%, N:0.002 ~ 0.003%, B:0.0003 ~ 0.0009%, Ti:0.05 ~ 0.09%, surplus is Fe.
2. a method of producing anti-secondary processing brittleness DC06 automobile steel claimed in claim 1 comprises hot rolling, cold rolling, annealing, it is characterized in that, in the described course of hot rolling, Heating temperature is 1250 ± 30 ℃, and finishing temperature is 930 ± 20 ℃, and coiling temperature is 710 ± 20 ℃.
3. method according to claim 2 is characterized in that, in the described cold-rolled process, draft is 75～85%.
4. method according to claim 2, it is characterized in that, in the described annealing process, the heating zone temperature is 850 ± 10 ℃, and the soaking zone temperature is 850 ± 10 ℃, the slow cooling section temperature out is 850 ± 10 ℃, fast cold section temperature out is 420 ± 10 ℃, and the overaging temperature is 360 ± 10 ℃, and temperature out is 150 ± 10 ℃, soaking time is 50～100s, and the speed of cooling of slow cooling section is 3 ~ 15 ℃/s; Fast cold section speed of cooling: 30 ~ 100 ℃/s.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103993226A (en) * | 2014-05-12 | 2014-08-20 | 攀钢集团攀枝花钢铁研究院有限公司 | High-strength cold rolled steel plate and preparing method thereof |
| CN103993227A (en) * | 2014-05-12 | 2014-08-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold rolled steel plate and preparation method thereof |
| CN104018077A (en) * | 2014-06-18 | 2014-09-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold-roll steel sheet and preparation method thereof |
| CN104120344A (en) * | 2014-07-16 | 2014-10-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold-rolled steel sheet and preparing method thereof |
| CN104120347A (en) * | 2014-07-16 | 2014-10-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold-rolled steel sheet and manufacturing method thereof |
| CN113528955A (en) * | 2021-06-29 | 2021-10-22 | 邯郸钢铁集团有限责任公司 | High-performance wide-plate-width IF steel and production method thereof |
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| CN101218363A (en) * | 2005-07-08 | 2008-07-09 | Posco公司 | Steel sheet for deep drawing having excellent secondary work embrittlement resistance, fatigue properties and plating properties, and method for manufacturing the same |
| CN102605250A (en) * | 2012-03-27 | 2012-07-25 | 首钢总公司 | Vehicle steel plate and production method thereof |
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| CN1115183A (en) * | 1993-10-05 | 1996-01-17 | 日本钢管株式会社 | Continuously annealed and cold rolled steel sheet |
| CN101218363A (en) * | 2005-07-08 | 2008-07-09 | Posco公司 | Steel sheet for deep drawing having excellent secondary work embrittlement resistance, fatigue properties and plating properties, and method for manufacturing the same |
| CN102605250A (en) * | 2012-03-27 | 2012-07-25 | 首钢总公司 | Vehicle steel plate and production method thereof |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103993226A (en) * | 2014-05-12 | 2014-08-20 | 攀钢集团攀枝花钢铁研究院有限公司 | High-strength cold rolled steel plate and preparing method thereof |
| CN103993227A (en) * | 2014-05-12 | 2014-08-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold rolled steel plate and preparation method thereof |
| CN103993226B (en) * | 2014-05-12 | 2016-01-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold-rolled steel sheet of a kind of high strength and preparation method thereof |
| CN103993227B (en) * | 2014-05-12 | 2016-01-13 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of cold-rolled steel sheet and preparation method thereof |
| CN104018077A (en) * | 2014-06-18 | 2014-09-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold-roll steel sheet and preparation method thereof |
| CN104018077B (en) * | 2014-06-18 | 2016-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of cold-rolled steel sheet and preparation method thereof |
| CN104120344A (en) * | 2014-07-16 | 2014-10-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold-rolled steel sheet and preparing method thereof |
| CN104120347A (en) * | 2014-07-16 | 2014-10-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold-rolled steel sheet and manufacturing method thereof |
| CN104120347B (en) * | 2014-07-16 | 2016-01-13 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of cold-rolled steel sheet and preparation method thereof |
| CN104120344B (en) * | 2014-07-16 | 2016-03-09 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of cold-rolled steel sheet and preparation method thereof |
| CN113528955A (en) * | 2021-06-29 | 2021-10-22 | 邯郸钢铁集团有限责任公司 | High-performance wide-plate-width IF steel and production method thereof |
| CN113528955B (en) * | 2021-06-29 | 2022-03-25 | 邯郸钢铁集团有限责任公司 | High-performance wide-plate-width IF steel and production method thereof |
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Application publication date: 20130206 |