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Steel hollow tube can be mainly divided into round hollow section, rectangular hollow section and square hollow section.
Rectangular and square carbon steel tube are widely used in various fields such as construction or building, low pressure liquid delivery, engineering, fencing,greenhouse etc.
Surface of steel tube generally are black or galvanized, galvanized Steel tube has good features of corrosion resistance, anti-rust, acid resistance, which largely extend its service life.
Galvanized Square and Rectangular Tubes
1. Product description
 |  | |
| Name | Pre galvanized Square Tube | HDG Square Tubes |
| Surface | Pre galvanized | Hot dipped galvanized |
| Process mothod | welded by galvanized coil sheet directly | welded by black steel coil then tubes dipped galvanization |
| Zinc coating | 40-120g/m2 | 200-500g/m2 |
2. Pictures of steel hollow section
Steel hollow tube can be mainly divided into round hollow section, rectangular hollow section and square hollow section.
Rectangular and square carbon steel tube are widely used in various fields such as construction or building, low pressure liquid delivery, engineering, fencing,greenhouse etc.
Surface of steel tube generally are black or galvanized, galvanized Steel tube has good features of corrosion resistance, anti-rust, acid resistance, which largely extend its service life.
Galvanized Square and Rectangular Tubes
1. Product description
| | |
| Name | Pre galvanized Square Tube | HDG Square Tubes |
| Surface | Pre galvanized | Hot dipped galvanized |
| Process mothod | welded by galvanized coil sheet directly | welded by black steel coil then tubes dipped galvanization |
| Zinc coating | 40-120g/m2 | 200-500g/m2 |
2. Pictures of steel hollow section
