甘肃冶金
甘肅冶金
감숙야금
GANSU METALLURGY
2014年
4期
45-49
,共5页
Q345B%焊缝开裂%弯曲弧开裂%焊接工艺%夹杂物
Q345B%銲縫開裂%彎麯弧開裂%銲接工藝%夾雜物
Q345B%한봉개렬%만곡호개렬%한접공예%협잡물
Q345B%welded seam crack%bend arc crack%welding technology%inclusion
针对热连轧厂生产的Q345B冷弯型钢用钢带在生产矩形管过程中出现的焊缝开裂、热影响区压扁开裂和弯曲弧开裂问题，通过对Q345B带钢成分、组织、夹杂物、气体、硫偏析等检验、分析以及对焊接工艺研究，得出焊接工艺不合理是造成焊缝开裂和热影响区压扁开裂的主要原因；原料中夹杂物多、带钢中存在的孔洞（或微裂纹）是造成弯曲弧开裂的主要原因。通过改进焊接工艺、减少钢中硫含量和提高钙处理效果等提高了矩形管合格率。
針對熱連軋廠生產的Q345B冷彎型鋼用鋼帶在生產矩形管過程中齣現的銲縫開裂、熱影響區壓扁開裂和彎麯弧開裂問題，通過對Q345B帶鋼成分、組織、夾雜物、氣體、硫偏析等檢驗、分析以及對銲接工藝研究，得齣銲接工藝不閤理是造成銲縫開裂和熱影響區壓扁開裂的主要原因；原料中夾雜物多、帶鋼中存在的孔洞（或微裂紋）是造成彎麯弧開裂的主要原因。通過改進銲接工藝、減少鋼中硫含量和提高鈣處理效果等提高瞭矩形管閤格率。
침대열련알엄생산적Q345B랭만형강용강대재생산구형관과정중출현적한봉개렬、열영향구압편개렬화만곡호개렬문제，통과대Q345B대강성분、조직、협잡물、기체、류편석등검험、분석이급대한접공예연구，득출한접공예불합리시조성한봉개렬화열영향구압편개렬적주요원인；원료중협잡물다、대강중존재적공동（혹미렬문）시조성만곡호개렬적주요원인。통과개진한접공예、감소강중류함량화제고개처리효과등제고료구형관합격솔。
The chemical component , microstructure, inclusion, gas content, sulfur segregation and welding technology were analyzed and tested to solve the problems in production of Q 345B rectangular welded pipe , such as welded seam , heat-affected zone and bend arc cracked etc .The conclusions were gained that unscientific welding technology induced wel -ded joint crack and numerous inclusions was the cause of bend arc crack .After optimization of welding technology , and re-duction of sulfur content and enhancement of calcium treatment effect , the qualified rate of rectangular pipe improved .
