Material and implementation standards.

1. Base material: Mainly Q235B, but Q345B can also be used. It includes seamless welded pipes, spiral welded pipes, and seamless pipes. In engineering applications, seamless/spiral welded pipes are often galvanized.

2. Core national standards – base materials: GB/T 3091-2024 “Welded Steel Pipe for Low-Pressure Fluid Transmission,” GB/T 9711 “Spiral Welded Pipe.”

– Galvanizing: GB/T 13912 Technical Specifications for Metal Coating: Hot-Dipped Galvanized Coating

3. Galvanization method: Hot-dip galvanization (mainstream), strictly prohibited cold galvanization (poor corrosion resistance; has been phased out).