Abstract: According to depth drill bit steel ]8CrNi3MoA's technical requirements and steel properties, three heats steel 18CrNi3MoA round bars are produced by process of 40t 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-casting- ingot homogenization treated at (1250 ± 10) ℃ for 15h-forging billet Φ140 mm at 780 -810℃  forging to Φ110 mm-full annealing. The chemical constituents satisfied the technical requirements,oxygen content in forgings 12.0 x 10 ^-6~ 13. 5 x 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.

Key words: Depth Drill Bit, 18CrNi3MoA Steel, Production Practice, Mechanical Properties, Oxygen Content, Grain Scale ,

摘要： 根据潜孔钻头用钢18CrNi3MoA技术要求及钢种特性,通过40t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1.52t铸锭-钢锭（1250±10℃ 15h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。

关键词: 潜孔钻头, 18CrNi3MoA钢, 生产实践, 力学性能, 氧含量, 晶粒度