A kind of medium carbon non-quenched and tempered steel and preparation method thereof
A technology of non-quenched and tempered steel and molten steel, applied in metal rolling, temperature control, etc., can solve problems such as surface cracking, achieve the effects of reducing internal stress, avoiding brittle cracking, and good toughness
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[0047] The present embodiment provides a medium carbon non-quenched and tempered steel, which is mainly prepared through the following steps:
[0048] The composition of medium carbon non-quenched and tempered steel includes: C 0.37%, Si 0.32%, Mn 1.24%, P 0.010%, S0.004%, Cr 0.12%, Ti 0.003%, Nb 0.002%, V 0.09%, Al 0.014 %, Ni 0.001%, N0.0134%, the balance is Fe and inevitable impurities, and Σ(Al+Nb+V+Ti) / N is 8.1.
[0049] The molten steel prepared from the above components is sequentially subjected to converter smelting, LF furnace refining, continuous casting and rolling. The size of the continuous casting billet is controlled to be 280mm×280mm, the specific water volume of the secondary cold water in the continuous casting production is 0.27L / kg, the temperature of the continuous casting billet entering the pit is 772-831°C, the cooling time in the pit is 106h, the pit temperature is 145°C, and the rolling The casting billet is heated before production. The temperature ...
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