First, high d material and technology

1.Material: the national standard Q-235A grade steel.

2.Electric welding process: carbon dioxide gas welding. (Uniform welding point, strong airtight performance, good firmness) electrode.

3.Surface treatment: outdoor hot-dip galvanizing processing

Second,medium - material and process

1.Material: non-standard Q-220B grade steel.

2.Electric welding process: manual electric welding technology.

3.Surface treatment: cold galvanized or not galvanized, paint.