600MPa grade low temperature high toughness weather corrosion resistant steel and its production method
A technology of atmospheric corrosion-resistant steel and production method, which is applied in the field of low-carbon and low-alloy steel, can solve the problems of high price, high production cost, difficult process control, etc., and achieves reduction of production cost, reduction of steel plate scrap rate, and easy process process. control effect
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[0036] In the laboratory, 4 furnaces of the present invention were smelted with a 50kg vacuum induction furnace, and the specific chemical compositions of the 4 furnaces of steel are shown in Table 1.
[0037] Through the production method of the present invention:
[0038] The production steps of its specific test:
[0039] 1) Smelting: adopt the smelting process of molten iron desulfurization, dephosphorization, converter top and bottom blowing, Al wire feeding for deoxidation, vacuum treatment after furnace, calcium treatment and fine-tuning of components;
[0040] 2) Carry out blooming: the blooming temperature is controlled at 1180°C;
[0041] 3) Finish rolling: the cumulative reduction rate of the last three passes of finishing rolling is 60%;
[0042] 4) Finish rolling: its temperature is controlled within the range of 850-870 °C;
[0043]5) Cooling: Cool the steel plate to 550-650°C at a cooling rate of 8°C / sec;
[0044] 6) Cool the steel sheet at room temperature ...
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