Thin thermoformed steel with tensile strength being not lower than 1100 MPa directly rolled by sheet billet and production method of thin thermoformed steel
A technology of tensile strength and hot-formed steel, applied in the field of thin hot-formed steel with tensile strength ≥ 1100MPa directly rolled by thin slabs and the production field, which can solve the problem of not meeting the needs of ultra-high-strength parts, short process, and low-strength level and other problems, to achieve the effect of no springback, short process and good surface quality
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[0041] The present invention is described in detail below:
[0042] Table 1 is the value list of the chemical components of each embodiment of the present invention and comparative examples;
[0043] Table 2 is the value list of the main process parameters of each embodiment of the present invention and comparative example;
[0044] Table 3 is a list of performance testing conditions of each embodiment of the present invention and comparative examples.
[0045] Each embodiment of the present invention is all produced by following process:
[0046] 1) Desulfurization of molten iron, and control S≤0.002%, and the exposed surface of molten iron after slag removal is not less than 96%;
[0047] 2) Conventional electric furnace or converter smelting, and conventional refining;
[0048] 3) Perform continuous casting, control the superheat of the tundish molten steel at 15-30°C, the thickness of the slab at 55-60mm, and the casting speed at 3.5-7.0 m / min;
[0049] 4) Carry out th...
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