Application of steel pipes in the field of construction

Steel pipes are widely used in the construction industry, and their models are usually distinguished based on outer diameter, wall thickness, material, and execution standards. The following are common classifications and specific model examples:
Common steel pipe models and specifications
Outer diameter and wall thickness representation: The specifications of steel pipes are often expressed as “outer diameter x wall thickness” (unit: mm). For example, the commonly used load-bearing steel pipes in buildings have an outer diameter range of Φ 16mm~Φ 219mm and a wall thickness of 2.0mm~40.0mm. ‌
Small caliber seamless steel pipe: with a small outer diameter (such as Φ 6mm~Φ 159mm), flexible wall thickness, commonly used for structural components. Examples of models include materials such as 20 #, 16Mn, 15CrMo, etc. ‌
Seamless steel pipes for construction: using hot rolling or cold drawing processes, the materials include carbon steel such as 10 #, 20 #, 35 #, 45 #, as well as Q345 series low-alloy steel. ‌
Structural steel pipe: used for general building structures and mechanical parts, with materials including Q235B, 35CrMo, etc., in accordance with standards such as GB/T8162. ‌
Material Classification
The material of steel pipes directly affects their strength and use:
Carbon steel: such as 10 #, 20 #, 45 #, with lower cost, suitable for general load-bearing
Low alloy steel, such as Q345A and Q345B, has high strength and is commonly used in high-pressure or special environments. ‌
Stainless steel, such as 304 and 316, has strong corrosion resistance and is commonly used in chemical or humid environments. ‌