A kind of 980mpa grade bainite-based q&p steel for automobile and its production method
A 980mpa, bainite technology, applied in the field of automotive steel manufacturing, can solve the problems of complex production process, complex process flow, and difficulty in satisfying stable production, and achieve the effect of reducing production cost and simplifying production process
Active Publication Date: 2022-05-17
ANGANG STEEL CO LTD
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Problems solved by technology
Using the heat treatment process of quenching and heating, high-strength steel with a strength level of 800MPa is produced, but the production process of this invention is too complicated to meet the needs of stable production
[0005] In summary, the traditional production process of cold-rolled high-strength Q&P steel for automobiles adopts the heat treatment process of quenching and heating, and its process flow is relatively complicated, which reduces the stability of production, and repeated heating and cooling of steel plates has become an obstacle to reducing production costs; at the same time In order to ensure the mechanical properties of the finished product, more microalloying elements are added, which further increases the production cost
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[0029] The present invention will be described in more detail through examples below. These examples are only descriptions of the best implementation modes of the present invention, and do not limit the scope of the present invention in any way.
[0030] The chemical composition of embodiment steel has been listed in table 1, and table 2 has listed the continuous casting of embodiment steel and hot rolling process parameter, and table 3 has listed embodiment steel cold rolling process parameter, and table 4 has listed continuous annealing The process parameters, Table 5 shows the mechanical properties of the steel of the embodiment.
[0031] Chemical composition (wt%) of table 1 embodiment steel
[0032] serial number C Si mn P S AlS N Nb 1# 0.26 1.50 2.50 - - 0.035 ≤0.0045 0.04 2# 0.25 1.45 2.42 - - 0.041 ≤0.0045 0.032 3# 0.24 1.55 2.46 - - 0.032 ≤0.0045 0.049 4# 0.27 1.4 2.48 - - 0.047 ≤0.0045 0.048 5#...
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Abstract
A 980MPa-grade bainite-based Q&P steel for automobiles and a production method, the chemical composition of which is calculated by mass percentage: C 0.24%-0.28%, Si 1.40%-1.60%, Mn 2.40%-2.50%, P≤0.020% , S≤0.0050%, AlS 0.020%~0.070%, N≤0.0060%, Nb 0.030%~0.05%, and the balance is Fe and other unavoidable impurities. Compared with the prior art, the invention has the beneficial effects of simplifying the production process and reducing the production cost while meeting the requirements of high strength and high elongation of the automobile body structural parts.
Description
technical field [0001] The invention relates to the field of steel manufacturing for automobiles, in particular to a 980MPa grade bainite-based Q&P steel for automobiles and a production method. Background technique [0002] At present, advanced high-strength steels are widely used in car bodies, such as Q&P980, TRIP980, DP980, and TWIP980. These steel types have been widely used in body B-pillars and door frame reinforcements, as well as more complex body structures such as front and rear longitudinal beams. pieces. While the application of advanced high-strength steel is becoming more and more extensive, problems such as forming difficulties accompanied by high strength are also emerging, and the requirements for cold stamping forming technology are relatively high. At the same time, as automobile factories continue to increase the strength requirements of automobile structural parts, the production process of the material itself will be more complicated, and the addition...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/02C21D1/26
CPCC22C38/02C22C38/04C22C38/002C22C38/06C22C38/001C22C38/12C21D8/0226C21D8/0236C21D1/26Y02P10/20
Inventor 蔡顺达刘仁东孙荣生林利金晓龙李岩郝志强
Owner ANGANG STEEL CO LTD