Cold-rolled steel sheet and its manufacture method

China Patent

PATENT NO 104955972
APP PUB NO CN-104955972-A
SERIAL NO

201380071636

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The present invention provides a kind of cold-rolled steel sheet of resistance to heat spot and excelling in abrasion resistance.The cold-rolled steel sheet contain 0.03~0.12% C, 0~1.0% Si (including no added), 0.2~0.8% Mn, less than 0.03% P (not including no added), less than 0.03% S (not including no added), 0.04~0.3% Ti and less than 0.05% Al (not including no added).In addition, surplus is made up of Fe and inevitable impurity.In addition, each element meets 5 × C% Si%+Mn%, 1.5 × Al% in the range of above-mentioned content<1 relation.In addition, the average grain diameter of Ti systems carbide is 20~100nm.In addition, section hardness is 200~400HV.Also, by so making Ti systems carbide fine dispersed, it is possible to increase resistance to heat spot and wear resistance.

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