A kind of ultra-low inclusion cold-rolled thin strip for high-speed stamping and its steel-making optimization method

Abstract

The invention is an ultra-low-inclusion cold-rolled thin strip for high-speed stamping, the number of inclusions in the steel plate is less than 3 pieces / cm in any thickness direction section 2 , the largest single inclusion size is less than 8 μm, there are no inclusion particles with a size greater than 6 μm within the 1 / 4 range from the outermost surface of the steel plate in the thickness direction, and the total size of oxide composite inclusion particles is less than 15 μm, and they are arranged in a spherical intermittent rolling direction . Compared with the prior art, the beneficial effects of the present invention are: the present invention provides an ultra-low-inclusion cold-rolled thin strip for high-speed stamping and its steelmaking optimization method. Small size, high pass rate of stamping, stamping speed can meet more than 300 times / min.

Description

technical field [0001] The invention relates to the field of thin steel strips, in particular to an ultra-low inclusion cold-rolled thin strip for high-speed stamping and a steelmaking optimization method thereof. Background technique [0002] With the improvement of economical and environmentally friendly social conditions, the thickness of steel plates is required to be greatly reduced without loss of performance, especially in the fields of household appliances and automobiles. At present, tin-plated sheets can reach below 0.2mm, and automobiles and civilian battery cases can be used. Reaching below 0.25mm, the thinning of the thickness also greatly improves the self-weight of the car. [0003] The improvement of production efficiency requires that the production speed in many processing fields needs to be greatly increased. For example, the stamping process of battery case has reached an astonishing 300 pieces / min from the previous 30 pieces / min, and the stamping speed h...

AI Technical Summary

Problems solved by technology

[0006] In the high-speed stamping process, the damage of inclusions to the steel plate is mainly related to the type, size, and position of the inclusions in the thickness direction of the steel plate. In IF steel and ordinary low-carbon steel, except for a small amount of aluminum oxide inclusions compounded with Mg and Ca, most of them are Mainly single particle alumina; the larger the inclusion size, the greater the stress concentration caused, and the stronger the damage to the steel plate; the position of the inclusion in the steel plate determines the degree of damage, and a certain size inclusion is 1 / 2 or 1 / 3 range, due to the long distance of stress transmission to the surface, it is not easy to cause damage to the surface of the steel plate, but when the inclusion is within 1 / 4 or closer to the surface, the stress concentration is easily transmitted to the surface are released to wreak havoc on surfaces

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