308L类不锈钢焊材熔敷金属-196℃冲击韧性研究

Research on impact toughness at-196℃of de-posited metal of 308L type stainless steel welding material

通过对国内外不同品牌的308L类焊材进行SMAW、SAW、MIG焊熔敷金属试验,发现焊后热处理会显著降低熔敷金属-196℃冲击韧性,经过数据分析,认为铁素体含量是影响焊材熔敷金属低温韧性最重要的因素。对改良型的308L焊条及埋弧焊丝焊剂进行熔敷金属焊接试验,通过化学成分分析计算出焊材铁素体含量约为3 FN,经过570℃×1 h热处理后-196℃冲击值大于50 J。

Through deposited metal tests of SMAW,SAW,MIG welding on 308L type welding materials of different brands at home and abroad,it is found that the postweld heat treatment will significantly reduce the impact toughness of the deposited metal at-196℃,after data analysis,the ferrite content is considered to be the most important factor affecting the low temperature toughness of deposited metal of welding materials.Through welding test of deposited metal for improved 308L electrode,submerged arc welding wire and flux,the ferrite content of welding material is about 3 FN by chemical composition analysis,after heat treatment at 570℃×1 h,the impact value is greater than 50 J at-196℃.