What is GB9948 Standard Seamless Pipe?
The GB9948 standard seamless pipe is primarily used in the manufacturing of high-quality carbon structural steel, alloy structural steel, and stainless heat-resistant steel for high-pressure and high-temperature steam boiler applications. These seamless pipes are designed to operate under extreme conditions, including high temperatures and pressures, and are often exposed to oxidation and corrosion from high-temperature flue gases and water vapor. As a result, they must possess excellent endurance strength and durability.
Common steel grades used in GB9948 seamless pipes include high-quality carbon structural steels such as 20G, 20MnG, and 25MnG; alloy structural steels like 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, and 12Cr3MoVSiTiB; and rust-resistant, heat-resistant steels such as 1Cr18Ni9 and 1Cr18Ni11Nb.
In addition to meeting strict chemical composition and mechanical property requirements, these high-pressure seamless tubes must undergo individual hydrostatic testing, as well as flaring and flattening tests to ensure their quality and performance. To achieve optimal mechanical properties, the pipes are typically delivered in a heat-treated condition.
These pipes are essential components in power plants, industrial boilers, and other high-temperature and high-pressure systems where reliability and safety are critical. The GB9948 standard ensures that the pipes meet the necessary specifications for long-term performance under harsh operating conditions.
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