... 18-630mmThe Description of High Pressure Alloy Steel Pipe SpecificationsChina StandardSteel GradeStandardseamless steel tubesGB/T8162-199910, 20, 35, ... SPEC 5LA, B, X42APIoil casing andtubing in oil wellsSeamles Steel TubesGB5310-199520G, 20MnG, 25MnG, 15MoG, 20MoG, 12Cr1MoVG, ... Zone Fuyuan Materials Co., Ltd. Street Address: Dadong Steel Pipe Market, Liaocheng Development Zone City: Liaocheng Province ...