... or imported ally pipes.We own: 2 lines of Card Punch product line for seamless steel pipes, 6 lines of hard ... :16Mn, 12Cr1MoVG, 15CrMoG, Cr5Mo, WB36, 10CrMo910, T91, N80, 5312 special pipe for ships, 45Mn2, 40Cr, 20Cr, 27SiMn, 35CrMo, low and middle ... -pressure boiler pipeGB3087-1999, High-pressure boiler pipe GB5310-1995, pipes special for urea fertilizer GB6479-2000, cracking ...