摘要
ML20MnTiB热轧盘条生产10.9级高强度螺栓,冷镦时发生开裂,分析开裂样品发现连铸坯表面针孔缺陷是造成开裂的主要原因。分析针孔缺陷影响因素并优化连铸保护浇铸工艺,连铸坯表面质量得到明显改善,经用户批量使用,未发现因针孔缺陷造成的开裂。
Grade 10.9 high strength bolts produced by ML20MnTiB hot rolled wire rod are cracked during cold heading.It is found that pinhole defect on continuous casting billet surface is the main cause of cracking.The influencing factors of pinhole defects were analyzed and continuous casting protective casting process was optimized.Surface quality of continuous casting billet was significantly improved.After extensive use by users,no cracks caused by pinhole defects were found.
作者
刘金庆
马春雨
陈猛
朱帅
曹长法
Liu Jinqing;Ma Chunyu;Chen Meng;Zhu Shuai;Cao Changfa(Qingdao Special Iron&Steel Co.,Ltd.,Qingdao 266043,China)
出处
《金属制品》
CAS
2022年第5期41-43,52,共4页
Metal Products
关键词
ML20MnTiB
冷镦开裂
针孔缺陷
脱碳
保护浇铸
ML20MnTiB
cold heading cracking
pinhole defects
decarbonization
protective casting process
