Gr.B Spiral steel pipe is made of strip steel coil as raw material, regular temperature extrusion molding, automatic double wire double-sided submerged arc welding process welded spiral seam steel pipe. Spiral steel pipe will be fed into the welded pipe unit, through the multi-channel roll rolling, the strip steel is gradually rolled up to form a round billet with an open gap, adjust the amount of extrusion rollers under pressure, so that the weld gap is controlled at 1~3mm, and make the weld ends flush.

Gr.A Spiral steel pipe is made of strip steel coil as raw material, regular temperature extrusion molding, automatic double wire double-sided submerged arc welding process welded spiral seam steel pipe. Spiral steel pipe will be fed into the welded pipe unit, through the multi-channel roll rolling, the strip steel is gradually rolled up to form a round billet with an open gap, adjust the amount of extrusion rollers under pressure, so that the weld gap is controlled at 1~3mm, and make the weld ends flush.

S355JR Carbon square pipe is a common construction material, mainly made of carbon or alloy steel. Its chemical composition includes elements such as carbon, silicon, manganese, sulfur and phosphorus, among which the carbon content accounts for a higher proportion of the total weight. The manufacturing process of carbon square pipe mainly includes hot rolling, cold drawing and cold drawing.

S235JR Carbon square pipe is a common construction material, mainly made of carbon or alloy steel. Its chemical composition includes elements such as carbon, silicon, manganese, sulfur and phosphorus, among which the carbon content accounts for a higher proportion of the total weight. The manufacturing process of carbon square pipe mainly includes hot rolling, cold drawing and cold drawing.

SS400 Carbon square pipe is a common construction material, mainly made of carbon or alloy steel. Its chemical composition includes elements such as carbon, silicon, manganese, sulfur and phosphorus, among which the carbon content accounts for a higher proportion of the total weight. The manufacturing process of carbon square pipe mainly includes hot rolling, cold drawing and cold drawing.

Q355 Carbon square pipe is a common construction material, mainly made of carbon or alloy steel. Its chemical composition includes elements such as carbon, silicon, manganese, sulfur and phosphorus, among which the carbon content accounts for a higher proportion of the total weight. The manufacturing process of carbon square pipe mainly includes hot rolling, cold drawing and cold drawing.

Q345 Carbon square pipe is a common construction material, mainly made of carbon or alloy steel. Its chemical composition includes elements such as carbon, silicon, manganese, sulfur and phosphorus, among which the carbon content accounts for a higher proportion of the total weight. The manufacturing process of carbon square pipe mainly includes hot rolling, cold drawing and cold drawing.

Q235 Carbon square pipe is a common construction material, mainly made of carbon or alloy steel. Its chemical composition includes elements such as carbon, silicon, manganese, sulfur and phosphorus, among which the carbon content accounts for a higher proportion of the total weight. The manufacturing process of carbon square pipe mainly includes hot rolling, cold drawing and cold drawing.