GB/T 5310-2023, “Seamless Steel Tubes for High-Pressure Boilers,” is a national standard in my country for seamless steel tubes used in high-pressure boilers. It was released on September 7, 2023, and officially implemented on April 1, 2024, replacing the older version, GB/T 5310-2017. This standard provides detailed regulations on the material, technical requirements, test methods, inspection rules, packaging, marking, and quality certificates for high-pressure boiler steel tubes, aiming to ensure that the quality and performance of boiler steel tubes meet the requirements for use in high-pressure boilers.
First. What is the scope of application for high-pressure boiler steel tubes?
GB/T 5310-2023 applies to seamless steel tubes used in the manufacture of steam boilers and pipelines operating at high pressure and above. It also applies to seamless steel tubes used in other high-temperature pressure-bearing equipment. These boiler steel tubes need to withstand high temperatures, high pressures, and corrosive media; therefore, strict requirements are placed on their material properties, mechanical properties, and corrosion resistance.
Second. Material Classification of High-Pressure Boiler Steel Pipes
The standard covers various materials for high-pressure boiler steel pipes, mainly including:
High-Quality Carbon Structural Steel: Such as 20G, 20MnG, 25MnG, etc., possessing good mechanical and weldability.
Alloy Structural Steel: Such as 12CrMoG, 15CrMoG, 12Cr2MoG, 12Cr1MoVG, etc., where the addition of alloying elements improves the high-temperature strength and corrosion resistance of the boiler steel pipes.
Stainless Heat-Resistant Steel: Such as 08Cr18Ni11NbFG, etc., possessing excellent oxidation and corrosion resistance, suitable for harsher working environments.
Third. Technical Requirements for High-Pressure Boiler Steel Pipes:
Chemical Composition: The standard strictly regulates the chemical composition of boiler steel pipes of various materials, including the content range of carbon, silicon, manganese, phosphorus, sulfur, and alloying elements, to ensure the stable performance of the boiler steel pipes.
Mechanical Properties: The standard specifies the tensile strength, yield strength, elongation, impact toughness, and other mechanical property indicators of boiler steel pipes to meet the strength requirements of high-pressure boilers. Technological Performance: Boiler steel tubes require rigorous heat treatment and surface treatment processes, such as normalizing, tempering, and quenching and tempering, to improve their microstructure and physical properties. Simultaneously, hydrostatic tests, flaring tests, and flattening tests are necessary to verify the technological performance of the boiler steel tubes.
Metallographic Structure: Specific requirements are also placed on the metallographic structure of boiler steel tubes to ensure their stability at high temperatures.
Fourth. What are the testing methods for high-pressure boiler steel tubes?
The standard specifies the testing methods for various performance indicators, including chemical composition analysis, mechanical property testing, and metallographic observation. These testing methods have clearly defined operating procedures and equipment requirements to ensure the accuracy and reliability of the test results.
Fifth. What are the inspection rules for high-pressure boiler steel tubes?
Inspection Types: These include factory inspection and type inspection. Factory inspection is a necessary inspection for each batch of boiler steel tubes to ensure they meet standard requirements; type inspection is a comprehensive performance evaluation of the boiler steel tubes and is usually conducted when new products are being trial-produced or when product standards undergo significant changes.
Inspection Items: Covering multiple aspects, including chemical composition, mechanical properties, technological performance, and metallographic structure.
Sampling Method: Specifying the quantity and method of sampling to ensure the representativeness of the inspection results.
Judgment Rules: Clarifying the criteria for determining whether something is qualified or unqualified to ensure that the quality of the boiler steel pipes meets the standard requirements.
Sixth. Packaging, Marking, and Quality Certificate of Pressure Cooker Steel Pipes
Packaging: Regulations are specified for the packaging method of boiler steel pipes to prevent damage during transportation and storage.
Marking: Boiler steel pipes should be marked with the standard number, material, specifications, manufacturer, and other information for easy identification and management.
Quality Certificate: The quality certificate provided with the boiler steel pipes should include information such as the chemical composition, mechanical properties, and inspection results, providing users with the necessary quality assurance evidence.
Post time: Jan-16-2026