Q: What are the main differences between standard GB/T 8162 (Structural) and GB/T 8163 (Fluid Transport) for seemingly similar grades like 20#?
A: Pipes produced under GB/T 8163 undergo stricter hydraulic (pressure) tests and may have more stringent requirements for non-destructive testing to ensure leak-proof integrity for fluid service.
Q: What grades are specified in GB 3087-2008 for low and medium-pressure boiler pipes?
A: This standard typically uses grades like 10# and 20# carbon steel-8.
Q: For high-pressure boiler applications (e.g., power plants), what is the key Chinese standard and what are some critical alloy steel grades used?
A: The key standard is GB 5310 (e.g., 2023 edition). Critical grades for high-temperature and high-pressure service include 20G, 15CrMoG, and 12Cr1MoVG-8-10. The latest version has stringent requirements on dimensional precision, microstructure, and non-destructive testing-10.
Q: For high-pressure fertilizer equipment, what standard and alloy grades are applied?
A: GB 6479-2000 is used, with grades like 20#, 16Mn, 12CrMo, and 12Cr2Mo-8.
Q: What steel grades are used for gas cylinders under GB 18248-2000?
A: This standard specifies medium-carbon manganese or alloy steels like 37Mn, 34Mn2V, and 35CrMo for high strength and toughness-8.
