... P5STFA25T5), 15CrMo(P11P12STFA22), 13CrMo44, Cr5Mo, 15CrMo, 25CrMo, 30CrMo, 40CrMo, and so on Standard: DIN17175-79, JISG3467-88, JISG3458-88, GB5310 ... Institute:Certificate of Authority to use the Official API Monogram.2> Boiler and Super-heater Pipes,Seamless Pressure Pipes had been ... Ltd., Baotou Steel Group Co., Ltd., Baoshan Steel Corporation and Tianjin Steel Pipe Group Co., Ltd.in China.With many ...