Black hollow steel refers to hollow steel that has not undergone galvanization or surface coating treatment. Its surface presents a natural black oxide film, which provides a good foundation for corrosion resistance. According to the different cross - sectional shapes, black hollow steel can be mainly divided into three types: circular, square, and rectangular. They are widely used in load - bearing structures and space frames to meet the requirements of different architectural forms and engineering projects.

Black Hollow Section is made of Q235 hot rolled or cold rolled strip steel or coil as the base material.The utility model relates to a hollow square lightweight thin-walled steel pipe made by cold bending process. Black steel pipe parameterThe thickness is generally about 1.0mm-30mmLength: 1-24 mete

Black Hollow Section is made of Q235 hot rolled or cold rolled strip steel or coil as the base material.The utility model relates to a hollow square lightweight thin-walled steel pipe made by cold bending process. Black steel pipe parameterThe thickness is generally about 1.0mm-30mmLength: 1-24 mete

Black Painted Seamless Steel Pipes is made of Q235 hot rolled or cold rolled strip steel or coil as the base material.The utility model relates to a hollow square lightweight thin-walled steel pipe made by cold bending process. Black hollow square steel pipe parameterThe thickness is generally about