Ultralow-inclusion cold-rolled thin strip for high-speed stamping and steelmaking optimization method thereof

Abstract

The invention discloses an ultralow-inclusion cold-rolled thin strip for high-speed stamping. The number of inclusions in a steel plate is smaller than 3 / cm2 in the section in any thickness direction,the size of the maximum single inclusion is smaller than 8 mum, inclusion particles with the size larger than 6 mum do not exist in the range of 1 / 4 of the distance between the thickness direction and the outermost surface of the steel plate, the total size of the existing oxide composite inclusion particles is smaller than 15 mum, and the oxide composite inclusion particles are arranged in a spherical intermittent rolling direction. Compared with the prior art, the ultralow-inclusion cold-rolled thin strip for high-speed stamping and a steelmaking optimization method thereof have the advantages that the number of the inclusions in the thin strip steel plate is extremely small, the size of the inclusions is extremely small, the stamping percent of pass is high, and the stamping speed canreach 300 times / min or above.

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...

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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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