L290M低温韧性不合格的原因分析与改进  

Cause Analysis and Improvement of Low Temperature Toughness Incompatibility of L290M

作　　者：张镇[1] Zhang Zhen(Shougang Jingtang United Iron&Steel Co.,Ltd.,Tangshan Hebei 063200)

机构地区：[1]首钢京唐钢铁联合有限责任公司,河北唐山063200

出　　处：《山西冶金》2023年第4期36-37,75,共3页Shanxi Metallurgy

摘　　要：利用扫描电镜和能谱分析等检测手段分析L290M冲击纤维断面率偏低的原因,结果表明,w(S)过高(0.004%),在组织中产生Mn S夹杂物,导致带钢韧性恶化。通过将w(S)控制在0.002%以下,可改善材料塑性,结果显示,-10℃时L290M冲击功纤维断面率趋于稳定,均达到90%以上,性能合格率达到100%。The reasons for the low cross-sectional area of L290M impact fibers were analyzed using scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The results showed that high w(S)(0.004%)resulted in the formation of MnS inclusions in the microstructure,leading to a deterioration in the toughness of the strip steel.By controlling w(S)below 0.002%,material shaping can be improved.The results show that at-10℃,the cross-sectional area of L290M impact energy fibers tends to stabilize,reaching over 90%,and the performance qualification rate reaches 100%.

关 键 词：管线钢 化学成分 纤维断面率 MNS 

分 类 号：TG142.1[一般工业技术—材料科学与工程]