Straight seam steel pipes are generally used for bridge support columns, because the performance of straight seam steel pipes is a little worse than seamless steel pipes and stronger than spiral steel pipes. The price is also cheaper than seamless steel pipes and more expensive than spirals. Using straight seam steel pipes can guarantee engineering It is safe and cost-saving, which is why it is widely used.
Each project will select the steel pipe material used in the project in advance before construction. The following materials are usually selected for bridge engineering support, Q345B, Q345E, Q345D, Q345qD, the comprehensive performance of these four materials is basically the same, and they are all low Carbon alloy material, corrosion resistance, tensile strength, high hardness and strong toughness. It is mainly used for bridge piling. The material used is also selected according to the terrain and engineering. The ordinary plain uses manganese plate Q345B material, high airflow coastal areas Q345E material is used, Q345qD material is used for viaduct projects, and Q345D material is used for high-speed rail bridges.
https://www.permanentsteel.com/newsshow/matters-needing-attention-in-the-storage-of-straight-seam-steel-pipes.html
