大约90%的钢材都是轧制出来的。
About 90% of the steel products are manufactured by rolling.
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.
钢材的化学成分和轧制时的工艺参数影响着高速线材的力学性能。
The steel's chemical composition and the process parameters influence the mechanical properties of high speed wire.
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