| 摘要 |
The present invention relates to a cold rolled steel sheet for processing with excellent heat resistance, and a preparation method thereof. The cold rolled steel sheet for processing comprises C:0.002~0.005%, Nb:0.02~0.06%, Co:0.02~0.20%, Mn:0.10~0.35%, Al:0.02~0.08%, P:0.003~0.020%, N:0.002~0.006%, S:less than or equal to 0.015%, the balance of Fe, and other inevitable impurities by weight%, or additionally comprises Sn:0.05~0.25% to the composition, and thus has excellent processability and heat resistance, or additionally has excellent discoloration resistance and the like. According to the present invention, it is possible to prepare a highly heat resistant cold rolled steel sheet for processing which can be prepared with a low cost compared with known stainless steel sheets, has excellent room temperature processability due to various processing characteristics such as stretch flange formability, bendability and deep drawing property, shows excellent formability since yield point elongation does not appear due to the increase of anti-aging property by precipitation of dissolved alloy elements, has excellent high temperature strength to be able to extend the lifetime of equipment due to the shape freezing property of products applied at a high temperature, and has excellent discoloration resistance at a high temperature. |
