normalized and tempered steel
正火及回火钢
The fatigue life of 45 normalized steel would be decreased by pre stretching.
微量的预应变会降低正火45钢的疲劳性能。
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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