Minerals & Metallurgy

Scope： Covers Seamless and Welded, Black and Hot-Dipped Galvanized nominal (average) wall pipe for coiling, bending, flanging and other special purposes and is suitable for welding. Continuous-Welded pipe is not intended for flanging. Purpose for which pipe is intended should be stated on order. Materials and Manufacture： The steel for both seamless and welded pipe shall be made by one or more of the following processes: open-hearth, electric furnace, or basic-oxygen. The weld seam of electric-resistance welded pipe in Grade B shall be heat treated after welding.Chemical Requirements： Type S(seamless)Type EType F(electric- ? ?resistance welded)(furnace- ? ?welded pipe)Grade AGrade BGrade AGrade BGrade ACarbon max. %0.250.300.250.300.3Manganese %0.951.20.951.21.2Phosphorous, max. %0.050.050.050.050.05Sulfur, max. %0.0450.0450.0450.0450.045Copper, max.%0.400.400.400.400.4Nickel, max. %0.400.400.400.400.4Chromium, max. %0.400.400.400.400.4Molybdenum, max. %0.150.150.150.150.15Vanadium, max. %0.080.080.080.080.08Hot-Dipped Galvanizing： Sets standards for coating of pipe with zinc inside and outside by the hot-dipped process. Weight of coating must not average less than 1.8 oz. per square foot and not less than 1.6 oz. per square foot. Permissible Variations in Wall Thickness： The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified. Permissible Variations in Weights per Foot： Plus or minus 10% Tensile Requirements： Seamless and Electric-resistance-weldedContinuous-WeldedGrade AGrade BTensile Strength, min., psi48,00060,00045,000Yield Strength, min., psi30,00035,00025,000Hydrostatic Testing：?Hydrostatic inspection test pressures for plain end and threaded and coupled pipe are specified. Hydrostatic pressure shall be maintained for not less than 5 seconds for all sizes of seamless and electric-resistance-weld pipe.Mechanical Tests Specified： Tensile Test -- Transverse required on ERW for NPS 8 and large. Sending Test