SWRCH35K钢盘条冷镦开裂分析与工艺改进  

Analysis on SWRCH35K Steel Wire Rod Cold Heading Cracking and Process Optimization

作　　者：苏振伟 赵赟 屠兴圹 周淼 左锦中 林俊 万文华 SU Zhenwei;ZHAO Yun;TU Xingkuang;ZHOU Miao;ZUO Jinzhong;LIN Jun;WAN Wenhua(Technology Center,Zenith Steel Group Co Ltd,Changzhou 213011)

机构地区：[1]中天钢铁集团有限公司技术中心,常州213011

出　　处：《特殊钢》2022年第4期32-35,共4页Special Steel

摘　　要：采用光学显微镜对SWRCH35K钢冷镦开裂样品和Φ12mm热轧盘条进行高倍检验。分析表明,冷镦开裂原因为热轧盘条表面存在完全脱碳层,导致强度下降,致使表层基体受冷镦成型过程中应力作用产生开裂。通过将钢坯加热温度从原1000-1150℃降至950-1050℃,空燃比控制在0.4-0.6,总加热时间由原95-212min降至95-158min,有效消除了SWRCH35K钢热轧盘条的完全脱碳层,避免了螺栓、螺母的冷镦开裂。The cold heading cracked samples and Φ12 mm hot-rolled wire rods of SWRCH35K steel are inspected by optical microscope.Analysis results show that the reason for cold heading cracking is full decarburized layer exist on the surface of hot-rolled wire rod,led to decrease of strength,resulting in stress cracking of the surface layer during the cold upsetting process.By decreasing billet heating temperature from original 1000-1150℃ to 950-1050℃,controlling airfuel ratio 0。4-0。6,and decreasing billet total heating time from original 95-212 min to 95-158 min,the full decarburized layer of SWRCH35K steel hot-rolled wire rod is effectively eliminated,and the cold heading cracking in the production process of bolts and nuts is avoided.

关 键 词：冷镦开裂 螺栓、螺母 SWRCH35K钢 完全脱碳层 加热工艺 

分 类 号：TG142.15[一般工业技术—材料科学与工程]