大容积无缝气瓶用4130X钢Φ600mm连铸圆坯研发  

Practice of Pilot Production on Φ600 mm Continuous Casting Round Bloom of 4130X Steel for Large Volume Seamless Gas Cylinders

作　　者：李刚 丁文彬 张朝磊[1] 尹修刚 姚忠 Li Gang;Ding Wenbin;Zhang Chaolei;Yin Xiugang;Yao Zhong(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083;Chengde Jianlong Special Steel Co Ltd,Chengde 067200)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]承德建龙特殊钢有限公司,承德067200

出　　处：《特殊钢》2022年第1期44-46,共3页Special Steel

摘　　要：采用"铁水→提钒转炉→预处理脱硫→70 t转炉→LF→VD→圆坯连铸→缓冷"的工艺流程生产4130X钢(/%:0.31C,0.26Si,0.80Mn,0.008P,0.003S,0.99Cr,0.21Mo,0.005Ti,0.023Al)Φ600 mm铸坯。通过控制铁水中P≤0.140%,S≤0.070%;转炉提钒后采用KR法进行预处理,KR搅拌速度≥80 r/min,搅拌时间15 min,控制KR出站S≤0.005%;转炉终点0.06%~0.10%C,终点P≤0.008%,出钢温度≥1620℃,并采用了滑板档渣技术;LF采用高Al精炼渣系,初渣40%~45%(CaO),10%~15%(SiO_(2)),控制终渣35%~40%(Al_(2)O_(3)),50%~55%(CaO),5%~15%(SiO_(2));VD Ca处理,控制钢中Ca含量0.0005%~0.0010%;真空度≤67 Pa,≥18 min,软吹≥20 min;连铸过程中采用结晶器(200A/2.0 Hz)+凝固末端电磁搅拌(900 A/6.0 Hz),过热度20~30℃,拉速0.21 m/min,二冷比水量0.08 L/kg,成功研发出大容积无缝气瓶用4130X钢Φ600 mm连铸坯,钢中A、D类夹杂物均≤1.0级,B、C类夹杂物均为0,Ds类≤1.5级,所有指标均满足用户要求。TheΦ600 mm cast bloom of 4130 X steel(/%:0.31 C,0.26 Si,0.80 Mn,0.008 P,0.003 S,0.99 Cr,0.21 Mo,0.005 Ti,0.023 Al)is produced by the technological route of"molten iron→vanadium extraction converter→pretreatment desulfurization→70 t converter→LF→VD→round bloom continuous casting→slow cooling".By control[P]≤0.140%,[S]≤0.070%in hot metal;KR pretreatment after vanadium extraction in converter,KR stirring speed 80 r/min for 15 min,and KR end[S]≤0.005%;converter end point 0.06%~0.10%C,end point[P]≤0.008%,tapping steel temperature≥1620℃,and using slide plate slag blocking technology;LF using high Al refining slag system,with the initial slag 40%~45%(CaO),10%~15%(SiO_(2)),the final slag 35%~40%(Al_(2)O_(3)),50%~55%(CaO),5%~15%(SiO_(2));VD Ca treated to control 0.0005%~0.0010%[Ca],the vacuum degree less than 67 Pa for≥18 min,and the soft blowing time≥20 min;in the process of continuous casting,using the mould(200 A/2.0 Hz)+solidification end electromagnetic stirring(900 A/6.0 Hz)combined stirring mode,the superheat 20~30℃,the constant drawing speed 0.21 m/min,and the secondary cooling specific water volume 0.08 L/kg,theΦ600 mm casting bloom of4310 X steel for large volume seamless gas cylinder is successfully developed with class A and class D inclusions in steel≤1.0 grade,class B and class C inclusions 0,class Ds≤1.5 grade,and all the indicators to meet the requirements of users.

关 键 词：无缝管用4130X钢 Φ600 mm铸坯 冶炼及浇注工艺 生产实践 

分 类 号：TF777[冶金工程—钢铁冶金]