Automotive alloying hot-dip galvanized steel with tensile strength of 440 MPa and production method
A tensile strength, hot-dip galvanizing technology, applied in hot-dip galvanizing process, metal material coating process, coating, etc., can solve the problems of high production cost, less micro-cracks, slow cooling speed, etc., and achieve uniform size distribution , fine surface structure and improved cooling uniformity
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[0040] The present invention will be described in detail below:
[0041] Table 1 is a list of values of various embodiments and comparative examples of the present invention;
[0042] Table 2 is a list of main process parameters of each embodiment and comparative example of the present invention;
[0043] Table 3 is a list of performance detection conditions of various embodiments of the present invention and comparative examples.
[0044] Each embodiment of the present invention is produced according to the following steps:
[0045] 1) Pre-treat the molten iron, control the S≤0.005% of the molten iron after pre-desulfurization treatment, and remove the slag;
[0046] 2) Conduct converter smelting and RH furnace treatment, and control the content of each element after refining to be within the set value range;
[0047] 3) Continuous casting: control the drawing speed at 1.2~1.4m / min, and the cooling speed of the cast slab surface shall not exceed 180℃ / m;
[0048] 4) Heating the slab, con...
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