The standards for seamless steel pipes vary depending on the country, industry, and application. Below are some common international, domestic, and industry standard classifications:
I. International Standards for Seamless Steel Pipes
ASTM (American Society for Testing and Materials)
• ASTM A106: Seamless carbon steel tubes for high-temperature applications (similar to GB/T 8163).
• ASTM A53: Carbon steel tubes for structural and fluid transport applications (seamless and welded).
• ASTM A335: Seamless alloy steel tubes for high-temperature applications (similar to GB 5310).
• ASTM A213: Seamless alloy steel tubes for boilers and heat exchangers.
EN (European Standards)
• EN 10216: Seamless steel tubes for pressure applications (grades P195~P460).
• EN 10297: Seamless steel tubes for mechanical engineering applications.
JIS (Japanese Standards)
• JIS G3454: Seamless tubes for carbon steel and molybdenum alloy steel applications.
• JIS G3463: Alloy steel tubes for boilers and heat exchangers.
ISO (International Organization for Standardization)
• ISO 9329: Series of standards for seamless steel tubes for pressure applications.
II. Chinese National Standards (GB) of Seamless Tubes
GB/T 8162-2018
• Name: Seamless steel tubes for structural use
• Applications: General structural applications, machining, and other non-pressure applications.
• Material: Carbon steel or low-alloy steel such as 20#, 45#, and Q345.
GB/T 8163-2018
• Name: Seamless steel tubes for fluid transportation
• Applications: Transportation of fluids such as water, oil, and gas, requiring pressure resistance.
• Material: 10#, 20#, 16Mn, etc.
GB 3087-2008
• Name: Seamless steel tubes for low and medium pressure boilers
• Applications: Boiler heat exchange tubes, pipelines, etc. (low and medium pressure conditions).
• Material: 20G, etc.
GB 5310-2017
• Name: Seamless steel tubes for high-pressure boilers
• Applications: Superheaters, main steam pipes, etc., for high-pressure boilers.
• Material: 20G, 15CrMoG, 12Cr1MoVG, etc.
GB 6479-2013
• Name: Seamless steel tubes for high-pressure fertilizer equipment
• Applications: Fertilizer equipment, high-pressure pipelines.
• Material: 20G, 16Mn, etc.
GB 9948-2013
• Name: Seamless steel tubes for petroleum cracking
• Applications: Furnace tubes, heat exchangers, etc., for petroleum refining equipment.
• Material: 12CrMo, 1Cr5Mo, etc.
III. Industry-Specific Standards for Seamless Steel Pipes
API (American Petroleum Institute)
• API 5CT: Seamless steel pipes for oil wells (e.g., J55, N80, P110 grades).
• API 5L: Line pipe standards (divided into PSL1 and PSL2 grades).
DIN (German Industrial Standards)
• DIN 17175: Seamless steel pipes for high-temperature applications.
Marine Industry
• GB/T 5312-2009: Seamless carbon steel and carbon-manganese steel pipes for marine applications.
IV. Key Parameters of Seamless Pipes
When selecting standards, pay attention to:
• Material: Carbon steel seamless pipes, alloy steel seamless pipes, stainless steel seamless pipes, etc.
• Dimensional tolerances: Outer diameter, wall thickness, length, etc. (e.g., the dimensional series specified in GB/T 17395-2008).
• Mechanical properties: Tensile strength, yield strength, elongation, etc.
• Process Requirements: Cold-rolled (precision seamless tube) or hot-rolled seamless tube.
V. Application Scenarios Recommendations of Seamless Steel Tubes
• Seamless steel tubes for oil/gas: API 5L or GB/T 9711 preferred.
• Seamless steel tubes for high-pressure boilers: GB 5310 or ASTM A213 preferred.
• Seamless steel tubes for mechanical structures: GB/T 8162 or EN 10297.
