Steel for high-carbon chromium cold roll billet and preparation method thereof

Abstract

The invention discloses a high-carbon chromium cold roll billet steel and a preparation method thereof. The cold roll billet steel contains the following chemical components in mass percent: C: 0.82-0.90%, Si: 0.30-0.50% , Mn: 0.40~0.50%, Cr: 3.00~3.20%, Ni: 0.20~0.30%, Mo: 0.20~0.30%, V: 0.05~0.15%, P≤0.020%, S≤0.015%, five harmful elements Sn ≤0.020%, As≤0.020%, Pb≤0.020%, Sb≤0.020%, Bi≤0.020%, gas [H]≤2ppm, [O]≤30ppm, [N]≤130ppm; the rest is Fe and other unavoidable Impurities. The steel of the invention has good strength and toughness, excellent low-magnification structure and high purity.

Description

technical field [0001] The invention relates to the technical field of iron and steel materials, in particular to a high-carbon chromium cold roll billet steel and a preparation method thereof. Background technique [0002] With the rapid development of industries such as automobiles, home appliances, and electronics, cold rolling is increasingly pursuing high speed, thin plates, and high quality, and the quality requirements for cold rolling work rolls are also getting higher and higher. Cold-rolled work rolls are subjected to heavy static and dynamic loads, and the surface is subject to severe friction and wear from the rolled material, so the surface is often overheated locally, and thermal cracks may occur. Therefore, the cold-rolled work roll requires high and uniform hardness and a sufficiently deep hardened layer on the surface, as well as good wear resistance and thermal crack resistance. Generally, the surface hardness requirement of cold-rolled work rolls is 90-10...

AI Technical Summary

Problems solved by technology

When ordinary 86CrMoV7 and 9Cr2Mo material work rolls are used for rolling thin plates or high-strength steel plates, due to insufficient wear resistance, the roll shape changes after a period of use, so that the cold-rolled plate shape and surface quality cannot meet the requirements, and frequent roll changes are bound to It affects the production efficiency of the rolling mill, and the number of grinding times increases, which increases the labor intensity of workers and increases the processing cost of the rolls. At the same time, the turnover of the rolls needs to increase, which increases the capital occupied by the rolls.

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