前言焊后进行消除应力热处理的目的是减少焊接残余内应力,降低接头的硕度和改善其金相组织。但是,由于钢种的不同,在消除应力热处理(以下简称 SR 处理)过程中,在某些钢种的接头区容易产生裂纹。一般认为,这种消除应力热处理裂纹(以下简称 SR 裂纹),对80公斤/毫米~2级低合金高强度钢和Cr—Mo—V 钢等钢种特别敏感。 Preface Postweld Stress Relief The purpose of heat treatment is to reduce the residual stresses in the weld, to reduce the joint size and to improve the microstructure. However, due to the different types of steel, stress-relieving heat treatment (hereinafter referred to as SR treatment), in some steel joints prone to cracking. It is generally believed that this stress relief heat treatment crack (hereinafter referred to as SR crack) is particularly sensitive to steel grades of 80 kg / mm ~ 2 low alloy high strength steel and Cr-Mo-V steel.