... Thickness(mm)Low or Middle Pressure Boiler pipe140-3406.0-3010#GB3087Low and medium pressure boiler header, steam pipes20#High-pressureBoiler ... fertilizer pipe, oil pipe, gas pipe, fluid pipe, boiler pipe and so on. 20MnG25MnG15MoG20MoG15CrMoG12Cr1MoVGSt35.8,St45.8DIN17175SA106A/B/CASME ... purpose of transportationOf gas, water, oil in oil andGas industry.A,B,X42,X46,X56,X60,X65API Spec 5LBASTM A53ASTM ...