normalized and tempered steel
正火及回火钢
The piece of steel tempered well.
这块钢回火后韧度正合适。
Steel is tempered by heating and then cooling it
钢是经过加热，然后冷却来回火。
Steel is tempered by heating and then cooling it.
钢是通过先加热后冷却来回火得。
Only effort to enter the elite youth tempered into a steel sing no regrets.
唯有努力，向名校进军百炼成钢唱出青春无悔。
Study on non hardened and tempered steel with low carbon martensite microstructure
低碳马氏体型非调质钢的研究
Basically, it is made of carbon steel, normalized and tempered steel, rare materials, etc.
连续油管用材主要有碳钢，调质钢和稀有材料等。
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