The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.
最后冷加工之后不进行热处理， 从而管子只可能进行很小的变形。
The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.
最后冷加工之后不进行热处理， 从而管子只可能进行很小的变形。
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