Anti-aseismic fire-resistant steel and preparation method thereof
A fire-resistant and stage-controlled technology, which is applied in the field of steel for building structures, can solve problems such as difficult process control, and achieve the effects of ensuring fire-resistant performance, improving yield strength, and reducing the transformation process.
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[0044] On the other hand, the present invention also provides a method for preparing seismic and refractory steel, including the following steps:
[0045] Step S1: Smelting and casting;
[0046] Step S2: A medium and heavy plate rolling mill is used for two-stage controlled rolling of recrystallization and non-recrystallization.
[0047] Specifically, step S2 includes the following steps:
[0048] S21. After the continuous casting billet or ingot is opened, it is loaded into a heating furnace and heated to T1, and kept for t1 time;
[0049] Specifically, in S21, T1 is 1200-1250°C. This is because when T1 is too high, the austenite grains of the cast slab are too coarse, and energy costs are increased. When T1 is too low, it is difficult for elements such as Nb and C to be fully dissolved. , Affecting subsequent precipitation and organizational control.
[0050] Specifically, in S21, the time t1 is too long, which increases energy costs and is not conducive to production efficiency. If t...
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