Low-carbon aluminium killed steel with excellent stamping properties and production method of low-carbon aluminium killed steel

Abstract

The invention discloses a low-carbon aluminium killed steel with excellent stamping properties and a production method of the low-carbon aluminium killed steel. The production method comprises the steps of hot rolling, cold rolling and batch annealing, and a casting blank adopted in the method comprises the following components in percentage by weight: less than or equal to 0.010% of C, 0.05-0.20% of Mn, less than or equal to 0.015% of S, less than or equal to 0.020% of P, greater than or equal to 0.05% and less than or equal to 0.25% of Si, 300-600 ppm of Als, less than or equal to 30 ppm of N, less than or equal to 20 ppm of Ca, and the balance of Fe and unavoidable impurities. The method adopts a bran-new composition design, by controlling the processing parameters of heat rolling, the rolling reduction of cold rolling and the process parameters and the like of batch annealing, a good recrystallization annealing structure and texture is obtained, and then a low-carbon Al killed steel with excellent stamping properties is obtained so as to meet the requirements of automobile parts on stamping properties.

Description

technical field [0001] The invention relates to a low-carbon aluminum-killed steel with excellent stamping performance and a production method thereof. Background technique [0002] In order to meet the diverse needs of steel for auto parts and to meet the weight reduction requirements of automobile bodies, more and more high-strength steels, especially advanced high-strength steels, are used in more and more proportions of automobile bodies; Steel for drawing and ultra-deep drawing still has an irreplaceable position in the fields of automobile panels and other fields, and the proportion of steel used in the body is relatively fixed. In order to improve the stamping performance of cold-rolled annealed steel strip, in terms of composition design, it is possible to reduce the carbon content and add an appropriate amount of fixed interstitial elements (such as Nb and / or Ti), and at the same time cooperate with appropriate process parameter control to obtain a good depth. This...

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Problems solved by technology

The Si content in the existing low-carbon Al-killed steel is generally less than 0.03%, partly because of the consideration of the subsequent coating process, because the Si content above 0.03% will lead to poor adhesion of the coating

The traditional process of producing this type of steel is converter steelmaking→LF furnace refining→continuous casting hot rolling→cold rolling→annealing. In order to improve the castability of molten steel, calcium treatment is carried out in the LF furnace process, but the LF furnace treatment is adopted, and the finished product The carbon content is high, generally between 0.03 and 0.06%, so the plastic strain ratio (r90) is low, and the stamping performance is not good

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