Abstract: Two heats of steel 21CrMolO (/%: 0. 18G, 0.29 ~0. 30Si, 0. 25 ~0. 27Mn, 0.007 ~0.008P, 0.003S, 2. 40 ~2.42Cr, 0. 35 ~0. 37Mo) are melted by 30 t EAF-LF-VD-7.2 t casting ingot flow sheet. The T-type steel tube with T-type head outside diameter 860 mm, tube body outside diameter 740 mm, wall thickness 60 mm, total length 6 500 mm is produced by hydraulic punching-reducing piercing-Pilger rolling tube process. Results show that compared with conventional forming process by forging and boring, the Pilgrim rolling process by which the mold mouth and tube body are formed only once is available to greatly increase the yield of raw material ； and the mechanical properties of tube products meet the requirement service.

摘要： 两炉21CrMo10钢(/%:0.18C,0.29~0.30Si,0.25~0.27Mn,0.007~0.008P,0.003S,2.40~2.42Cr,0.35~0.37Mo)由30 t EAF-LF-VD-7.2 t铸锭流程冶炼。T型头外径860 mm,管体外径740 mm,壁厚60 mm,总长度6 500 mm的T型钢管经水压冲孔-减径穿孔-周期轧管工艺生产。结果表明,与传统锻造镗孔成型工艺相比,使用轧管工艺管模承口端与管体一次成型,大幅度提高原材料利用率,成品管的力学性能满足使用要求。