Abstract: The cold upsetting steel is produced by hot metal pretreatment - LD- ladle argon stiring process. It is obtained that the multi- elements compound inclusions in steel lead to cold upseting crack of steel based on analysis of structure and inclusions of cold upsetting crack of 0.23C-0.69Mn steel for rivet by scarning electon microscope and energy dispersive x- ray spectometer. With increasing ladle bottom blowing argon pressure from 0.3 MPa to 0.6~1.0 MPa,modified original blowing argon procedure - soft blowing argon after Ar stiring for 1 min and total blowing argon for 3 min to impruved blowing argon procedure - soft blowing argon after Ar stiring for 3 min and total blowing argon for more than 6 min,and improving baking process for tundish to decrease inclusion MgO,the cold upsetting crack of steel for rivet was effectively avaided.

Key words: Stcel for Rivet,Cold Upsetting Crack,Compound Inclusion,Ladle Argon Stiring

摘要： 采用铁水预处理-LD-钢包吹氩工艺生产铆螺钢,通过对0.23%C~0.69%Mn铆螺钢冷镦开裂组织和夹杂物的扫描电镜和能谱分析得出,钢中存在多种元素复合夹杂物是铆螺钢冷镦开裂的主要原因。通过将钢包底吹氩压力由0.3 MPa提高到0.6~1.0 MPa,并由原工艺吹氩1 min后软吹氩、总吹氩时间为3 min改为吹氩3 min后软吹氩、保证总吹氩时间≥6 min,同时改进中间包烘烤工艺减少MgO夹杂,从而有效地避免了铆螺钢冷镦时的开裂现象。

关键词: 铆螺钢, 冷镦开裂, 复合夹杂物, 钢包吹氩