What is GB9948 standard seamless pipe (shandong small and large diameter seamless pipe plant)
The GB9948 standard seamless pipe is mainly used for manufacturing high-quality carbon structural steel, alloy structural steel and stainless heat-resistant steel high-pressure seamless pipes for high-pressure and high-pressure steam boiler pipes. The GB9948 seamless boiler tubes work under high temperature and high pressure, and the tubes also undergo oxidation and corrosion under high-temperature flue gas and water vapor. Steel pipes are required to have high endurance strength. The steel grades are: high-quality carbon structural steel grades 20G, 20MnG, 25MnG; alloy structural steel grades 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.; rust-resistant heat-resistant steel commonly used 1Cr18Ni9, 1Cr18Ni11Nb high-pressure boiler In addition to guaranteeing the chemical composition and mechanical properties, the tube should be hydrostatically tested one by one, and flaring and flattening tests should be performed. The high-pressure seamless tube should be delivered in a heat-treated state.
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