Quantity of steel pipes used in construction

The quality requirements for steel pipes used in construction mainly involve materials, specifications, appearance, and safety performance, and specific standards vary depending on the application scenario (such as scaffolding, structural support, etc.).

Material requirements
Scaffold steel pipe: Q235 steel with an outer diameter of 48.3mm and a wall thickness of ≥ 3.6mm should be used, and there should be no severe corrosion, cracks, or deformation. ‌
Seamless steel pipes: divided into structural use (GB/T8162-2008), fluid transportation use (GB/T8163-2018), etc., with materials including low carbon steel (such as 10 #, 20 #) and alloy steel (such as 16Mn). ‌
Specifications and dimensions
Scaffold steel pipe: allowable deviation of outer diameter ± 0.5mm, negative deviation of wall thickness ≤ 0.36mm. ‌
Seamless steel pipe: The outer diameter of hot-rolled pipe is ≥ 32mm, and the outer diameter of cold-rolled pipe can reach 6mm, with higher wall thickness accuracy. ‌
Appearance and safety requirements
Surface: No rust (depth ≤ 0.5mm), pits (≤ 5mm), bends (≤ 3mm) or cracks. ‌
Fasteners: Made of malleable iron, with a bearing capacity of ≥ 8kN for right angle fasteners, ≥ 8.5kN for rotary fasteners, and a bolt tightening torque of 40-65N · m. ‌
Other standards
Single weight: The maximum weight of scaffold steel pipes is ≤ 25.8kg, based on the safety limit for manual handling. ‌
Anti corrosion treatment: New steel pipes need to be coated with anti rust paint, and old steel pipes should be inspected for rust every year.