由于加工硬化效应的影响，随着冷拔变形量的增加，合金丝材的室温强度增加，扭转塑性下降。
Due to the effect of strain hardening, higher amount of cold deformation resulted in superior room temperature strength and inferior torsion ductility.
在氧化磨损阶段，由于加工硬化提高了合金的硬度和强度，对合金施以一定程度的冷变形可有效地提高其耐磨性。
At the oxidation wear stage, certain degree of cold deformation can improve the wear resistance of the alloy because of work hardening.
文章介绍了我国目前SO_2吹气硬化冷芯盒制芯的现状、特点、原理及典型的工艺流程；
The paper introduces the present situation, Charac-teristice, principle and typical process flow of SO_2 gassing hardening cold box process in our country.
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