900MPa-grade high-surface-quality pickling automobile steel as well as manufacturing method and application of 900MPa-grade high-surface-quality pickling automobile steel
A manufacturing method and a high-surface technology, applied in metal rolling and other directions, can solve problems such as how to improve the surface quality and hole expansion performance of pickling automotive steel that have not been paid attention to
Pending Publication Date: 2022-07-22
MAANSHAN IRON AND STEEL COMPANY
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[0004] The pickled automotive steel in the prior art is mainly based on the strength of 800MPa and below, and the main focus of the pickled automotive steel is on the strength of the pickled automotive steel, and no attention has been paid to how to improve the pickling strength. Surface Quality and Hole Expandability of Automotive Steel
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[0034] A 900MPa grade high surface quality pickling automobile steel, comprising the following chemical components by weight: C: 0.07%-0.10%, Si: 0.22%-0.32%, Mn: 1.60%-2.20%, Al: 0.030% ~0.060%, P≤0.015%, S≤0.008%, Nb: 0.020%~0.080%, Ti: 0.10%~0.15%, Mo: 0.10%~0.20%, Cr: 0.2%~0.5%, and Mo / 3 +Cr≥0.6%, Ca≤0.008%, and the rest are Fe and inevitable impurities.
[0035] The manufacturing method of the 900MPa grade high surface quality acid-washed automobile steel includes the following steps: molten iron pretreatment→converter smelting→alloy fine-tuning station→LF→RH→continuous casting→cast billet hot charging→hot continuous rolling→laminar flow Cooling → coiling → pickling → coiling.
[0036] In the continuous casting step, a stable speed casting method and a uniform cooling process with the fluctuation control of the molten steel level of the mold within ±3mm are adopted, dynamic light pressing is used, and the impurities are floated by electromagnetic roller stirring to obtai...
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The invention provides 900MPa-grade high-surface-quality pickling automobile steel as well as a manufacturing method and application thereof. The pickling automobile steel comprises the following chemical components in percentage by weight: 0.07%-0.10% of C, 0.22%-0.32% of Si, 1.60%-2.20% of Mn, 0.030%-0.060% of Al, less than or equal to 0.015% of P, less than or equal to 0.008% of S, 0.020%-0.080% of Nb, 0.10%-0.15% of Ti, 0.10%-0.20% of Mo, 0.2%-0.5% of Cr, more than or equal to 0.6% of Mo / 3 + Cr, less than or equal to 0.008% of Ca and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: pretreating molten iron, smelting in a converter, performing alloy fine tuning, performing LF, performing RH, performing continuous casting, performing hot charging on a casting blank, performing hot continuous rolling, performing laminar cooling, coiling, pickling and coiling. The manufactured pickling automobile steel has the high strength of 900 MPa level and good surface quality and reaming performance at the same time.
Description
technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a 900 MPa grade high surface quality pickling steel for automobiles and a manufacturing method and application thereof. Background technique [0002] Energy saving, environmental protection and safety are the three major challenges facing the development of today's automobile industry. Implementing vehicle lightweighting can reduce vehicle body weight and energy consumption without sacrificing safety performance. At the same time, the lightweight will also bring about the improvement of vehicle handling stability and a certain sense of collision safety to a certain extent. In the selection of lightweight materials for automobiles, the application of high-strength steel is one of the main ways. [0003] The high-strength multiphase steel composed of ferrite, bainite, martensite and precipitates not only has high strength and sufficient formability, ...
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Login to View More IPC IPC(8): C22C38/02C22C38/38C22C38/06C22C38/26C22C38/28C22C38/22C22C33/04C21D8/02B21B1/46
CPCC22C38/02C22C38/38C22C38/06C22C38/26C22C38/28C22C38/22C22C38/002C22C33/04C21D8/0205C21D8/0226C21D8/0236C21D8/0242C21D8/0278B21B1/463C21D2211/002C21D2211/005C21D2211/009Y02P10/20
Inventor 谷海容刘阳马聪吴胜付刘飞彭正波白丽杨梁高潮崔磊计遥遥
Owner MAANSHAN IRON AND STEEL COMPANY