A 600mpa high-strength hot-rolled structural steel and its manufacturing method
A high-strength, hot continuous rolling technology, applied in the field of low-alloy steel manufacturing, can solve the problems of adverse effects of alloy content on weldability, high cost of steel plates, low C content, etc., to achieve improved strength and toughness, good cold-formation performance, high The effect of low temperature toughness
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[0044] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.
[0045] The chemical composition of the steel plate embodiment of the present invention is shown in Table 1, and the balance is Fe and unavoidable impurities. Slabs are formed by deep desulfurization of molten iron, smelting in a 500kg vacuum induction furnace, refining outside the furnace, and continuous casting. Heat the slab to 1230-1280°C, keep it warm for more than 3 hours, finish rough rolling at 1000-1050°C, finish rolling at 820-920°C, water cool to the specified coiling temperature after rolling, and cool at a rate of 10-50°C / s, the coiling temperature is 400-550°C. See Table 2 for the process parameters of the manufacturing method of the embodiment of the present invention, and see Table 3 for the mechanical properties.
[0046] Table 1 Unit: weight percentage
[0047]
[0048] Table 2
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[0050]
[0051] table 3
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