大约90%的钢材都是轧制出来的。
About 90% of the steel products are manufactured by rolling.
轧制时严格控制加热温度和均热时间，确保钢材表面质量和力学性能。
The reheating temperature and soaking time have to be strictly controlled in the rolling stage so as to ensure mechanic properties of the steel products.
金相试验表明，适当降低轧制温度有利于晶粒的细化，从而改善钢材的力学性能。
Metallographic experiment indicate that reducing the rolling temperature properly is propitious to thin crystal, consequently the mechanical performance of steel products is also improved.
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