潜孔钻头用钢18CrNi3MoA锻制圆棒的生产实践

Production Practice of Steel 18CrNi3MoA Forge Round Bar for Depth Drill Bit

根据潜孔钻头用钢18CrNi3MoA技术要求及钢种特性,通过40 t电弧炉(终点[C]≥0.05%、P≤0.003%,出钢温度≥1630℃)-LF(精炼渣碱度3.0~4.5)-VD(≤70 Pa时间≥25 min)-氩气保护1.52 t铸锭-钢锭(1250±10)℃15 h均质化处理-锻坯Φ140 mm,780~810℃锻至Φ110 mm-完全退火等工艺,试制的3炉18CrNi3MoA钢圆棒的化学成分均满足技术要求,锻材氧含量12.0×10^(-6)~13.5×10^(-6),非金属夹杂物均≤1级;带状组织2级、奥氏体晶粒度8.5级,力学性能测定均满足技术要求。

According to depth drill bit steel 18 CrNi3 MoA’s technical requirements and steel properties,three heats steel 18 CrNi3 MoA round bars are produced by process of 40 t EAF(end[C]≥0.05%,[P]≤0.003%,tapping temperature≥1630℃)-LF fining(refining slag basicity 3.0~4.5)-VD(≤70 Pa,≥25 min)-argon shield 1.52 t ingot-castingingot homogenization treated at(1250±10)℃for 15 h-forging billetΦ140 mm at 780~810℃forging toΦ110 mm-full annealing.The chemical constituents satisfied the technical requirements,oxygen content in forgings 12.0×10^(-6)~13.5×10^(-6),non-metallic inclusions rating≤1,rating of banded structure is 2,austenitic grain scale is 8.5,and mechanical properties test satisfiy the technical requirements.