HG70低合金高强钢的焊接冷裂敏感性及其焊接预热温度的拟定  

Welding Cold Cracking Sensitivity of HG70 High-strength Low-alloy Steel and Its Welding Preheat-temperature Development

作　　者：任芝兰[1] 邓彬[1] 

机构地区：[1]湖南工学院机械系,湖南衡阳421002

出　　处：《热加工工艺》2009年第23期152-154,共3页Hot Working Technology

基　　金：湖南省教育厅科技计划项目(08C256)

摘　　要：综合运用碳当量法、焊接冷裂敏感指数法、插销试验和斜Y坡口试验,研究了HG70低合金高强钢的焊接冷裂敏感性。结果表明,10mm厚的HG70钢板具有一定的淬硬倾向,焊前应进行低温预热,以提高其临界断裂应力,降低其冷裂敏感性;预热温度应控制在80～120℃。Through calculations of carbon equivalents, cold crack sensitivity indexes, implant tests and Y-groove cracking tests, the cold crack sensitivity of HG70 high strength low alloy steel was investigated. The results show that HG70 steel plates with the thickness of 10mm has some hardenability and cold crack sensitivity, thus low-temperature preheating should be conduct before welding. Preheating can heighten the critical fracture stress and lower the sensitivity of the cold crack. The preheating temperature should be controlled between 80 and 120℃.

关 键 词：HG70钢 焊接性 冷裂纹敏感性 

分 类 号：TG142.41[一般工业技术—材料科学与工程] TG406[金属学及工艺—金属材料]