180 MPa-grade cold-rolled ultralow carbon baking hardened steel and production method thereof
A bake-hardening and production method technology, applied to 180MPa grade cold-rolled ultra-low carbon bake-hardened steel and its production field, can solve the problems of low tensile strength, high cost, lower P content, etc., and achieve excellent stamping performance , low production cost, good surface quality
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[0015] A 180MPa grade cold-rolled ultra-low carbon bake-hardening steel of the present invention, its chemical components and component weight percentages are: C: 0.0015-0.0023%; Si: 0.006-0.010%; Mn: 0.40-0.55%; P :0.030~0.045%; Nb:0.008~0.010%; S≤0.012%; Als:0.032~0.040%; N:0.0016~0.0037%, the rest is Fe; where C% / Nb%=0.16~0.28.
[0016] C is the most important strengthening element of strip steel. The precise control of C element can effectively adjust the bake hardening performance of the matrix, but the increase of C content will damage the stamping performance of the material. After a large number of tests, the range of C element selected in the present invention is 0.0015~ 0.0023%.
[0017] The solid solution element P can effectively improve the strength of ultra-low carbon bake-hardening steel, but too high P content (the weight percentage of P ≥ 0.07%) will lead to the embrittlement of the secondary processing of the strip; Mn has a direct impact on the final perform...
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