GB Standard for Welded Steel Pipes
Welded steel pipes are formed by winding steel strips into a tube shape and welding the two ends together through arc welding technology. According to different welding methods and application fields, welded steel pipes can be divided into straight seam welded pipes and spiral welded pipes.
According to GB/T 3091-2015 standard, there are specific requirements for the specifications, materials, mechanical properties, etc. of welded steel pipes.
Item | Standard requirements |
Standard number | GB/T 3091-2015 |
Material grade | Q195, Q215, Q235, Q345, etc. |
Outer diameter range | 20mm - 426mm |
Wall thickness range | 1.0mm - 16mm |
Length range | 5m - 12m |
Welding method | Resistance welding, automatic submerged arc welding, etc. |
Surface treatment | Non-plating, galvanizing, coating, etc. |
Application range | Water pipes, gas pipes, building structures, bridges, etc. |
Main performance requirements of welded steel pipes
1. Dimensional tolerance: The dimensional tolerance of welded steel pipes shall comply with GB/T 3091-2015 standard to ensure that the outer diameter, wall thickness, etc. are within a certain range to ensure the adaptability of the pipe.
2. Mechanical properties: The mechanical properties of welded steel pipes must meet the requirements of different material grades, including tensile strength, yield strength and other indicators.
3. Surface quality: The surface of the welded steel pipe should be free of obvious defects such as cracks, bubbles, scratches, etc. The surface treatment method can be selected according to user needs.
Inspection methods for welded steel pipes
1. Appearance inspection: Check whether there are defects in the welding joints and pipe surfaces.
2. Dimension measurement: Use special tools to check the outer diameter, wall thickness and other dimensions of the pipe.
3. Mechanical property test: Perform tensile test, bending test, etc. to detect the mechanical properties of the pipe.
4. X-ray inspection: Check the quality of the weld to ensure there are no internal defects.
Yangtze Steel provides welded steel pipes of various specifications to meet the needs of different industries and ensure that the product quality meets national standards. For more information or purchase, please contact us.
