Abstract: The Φ130-170 mm bar of steel SAE4137M for petroleum drill pipe connecting sleeve (/% : 0.35-0.38C, 0.15-0.35Si, 0.85-l.00Mn, ≤ 0.015P, ≤ 0.008S, 0.90-1.20Cr, 0.28-0.33Mo，≤ 0.005Ca, ≤ 0.0090N) has been pilot-produced by hot metal pretreatment-150 t top and bottom combined blown converter-LF-RH-350 mm x 470 mm casting with M-EMS-continuous rolling process at Bengang. With adding compound deoxidizer during converter tapping, diffusion deoxidizing with argon stirring in LF refining, soft argon blowing and strict-controlling feeding calcium wire amount in RH refining, and controlling liquid overheating extent within 20-30 ℃ , in steel products the oxygen content is (13-15 ) x 10^-6 , hydrogen content (0.4~0.5) x 10^-6 , nitrogen content (35-44) x 10^-6, residual calcium content ( 12-18) x 10^-6 and Al/N is ensured ≥ 2, that all meet the requirement for petroleum steels

Key words: 150 t BOF-LF-RH-CC Flow Sheet, Steel SAE4137M for Petroleum Drill Pipe Connecting Sleeve, Pilot Production

摘要： 本钢采用铁水预处理-150t复吹转炉-LF-RH-350 mm × 470 mm连铸、M-EMS-连轧工艺生产φ130～170 mm石油钻杆连接套用钢SAE4137M(/%:0.35～0.38C、0.15～0.35Si、0.85～1.00Mn、≤0.015P、≤0.008S、0.90～1.20Cr、0.28～0.33Mo、≤0.005Ca、≤0.0090N)。通过转炉出钢过程加复合脱氧剂,LF扩散脱氧全程吹氩搅拌,RH"软吹氩",严格控制喂钙线量,控制连铸钢水过热度20～30℃,使钢材中氧含量为(13～15)×10^-6,氢含量(0.4～0.5)×10^-6,氮含量为(35～44)×10^-6,残余钙含量(12～18)×10^-6,并保证钢中Al/N≥2,满足石油用钢的要求。

关键词: 150 t BOF-LF-RH-CC流程, 石油钻杆连接套用钢SAE4137M, 试制