冷成型用高强钢90°折弯开裂原因分析及探讨  

Analysis and Discussion on 90° Bending Cracking of High Strength Steel for Cold Forming

作　　者：李洪波 任志鑫 孙晶磊 李君彦 LI Hong-bo;REN Zhi-xin;SUN Jing-lei;LI Jun-yan(Wuan Yuhua Iron and Steel Co.Ltd.,Handan 056300,China)

机构地区：[1]武安裕华钢铁有限公司,河北邯郸056300

出　　处：《甘肃冶金》2022年第4期94-96,共3页Gansu Metallurgy

摘　　要：Q355B作为一种低合金高强度结构钢,在某公司产能占比较大,下游客户用途广泛,但在做90°折弯加工时,反馈产品直角折弯处外侧出现断续、长短不一的裂纹缺陷。为此,针对缺陷样板使用金相显微镜、扫描电镜进行仔细观察分析,最终找出了导致钢带加工过程开裂的主要原因:大量的硫化物夹杂形成带状组织,在外力作用下扩张导致开裂。Q355 B, as a low-alloy high-strength structural steel, accounts for a large production capacity in company and is widely used by downstream customers. However, during 90° bending, the appearance of R corner of the feedback product has intermittent crack defects of different lengths. Therefore, we carefully observed and analyzed the defect sample with metallographic microscope and scanning electron microscope, and finally found out the main reason for the cracking of steel strip in the processing process: a large number of sulfide inclusions form banded structure and expand under the action of external force.

关 键 词：硫化物夹杂 钢带 折弯开裂 结构钢 裂纹 

分 类 号：TG142.1[一般工业技术—材料科学与工程]