Als、N和过热度对Φ50~60mm 40Mn2钢裂纹影响分析和改进工艺  

Analysis on Effect of Als、N and Superheat on 40Mn2 Steel Φ50 ~ 60 mm Bar Crack and Technology Improvement

作　　者：郭志强 Guo Zhiqiang(Technology Center,Henan Feng Bao Special Steel Co Ltd,Linzhou 456500)

机构地区：[1]河南凤宝特钢有限公司技术中心,林州456500

出　　处：《特殊钢》2022年第1期62-65,共4页Special Steel

摘　　要：通过使用ARL8820直读光谱仪,LECO氧氮氢气体分析仪和铂铑热电偶等方法,研究了40Mn2圆钢中的Als、N和连铸钢液过热度对钢材裂纹的影响。结果表明:Als、N和连铸钢液的过热度分别为0.021%~0.035%,0.0065%~0.0083%和32~46℃的炉次Φ50~60 mm轧材表面出现了裂纹。工艺改进后,控制钢中的Als 0.015%~0.025%,[N]≤0.0060%,连铸钢液过热度18~30℃,连铸坯表面未出现裂纹,保证了轧材表面质量。The effect of Als、N in 40Mn2 round steel and superheat of molten steel on the steel bar crack is studied by using ARL8820 Direct-reading spectrometer,LECO oxygen-nitrogen-hydrogen gas analyzer,platinum rhodium thermocouple etc.The results show that of heats respectively with 0.021%~0.035% Als,0.0065%~0.0083% N and cast liquid superheat 32~46℃ the Φ50~60 mm rolled bar surface occurs crack.After technology improvement,with controlling 0.015%~0.025%Als,≤0.0060%[N]and the superheat of molten steel 18~30℃,the cracks on the surface of continuous casing billet non-occur and the surface quality of the products is guaranteed.

关 键 词：40MN2钢 ALS N 过热度 钢材裂纹 

分 类 号：TG142[一般工业技术—材料科学与工程]