Aging treatment is performed for microalloyed steel for coldhardening bolt, which can stabilize its microstructure, enhance its strength and reduce its residual stress.
冷作强化非调质钢螺栓经时效处理可以稳定组织、提高强度、降低残余应力。
2
The new domestic - developed plastic mould steels include prehardening steel . age hardening steel, quenching-tempering steel, cold -forming steel, and anti - corrosion steel, etc.
国产新型塑料模具钢主要有预硬钢、时效硬化钢、淬火——回火钢、冷挤压成型模具钢、耐蚀钢等类型。
3
The paper introduces the present situation, Charac-teristice, principle and typical process flow of SO_2 gassing hardeningcold box process in our country.