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Spiral seam steel pipe is made of strip coil as raw material, extruded at room temperature and welded by automatic double-wire double-sided submerged arc welding process.
Spiral seam steel pipe welded by automatic double-wire double-sided submerged arc welding process with strip coil as raw material, often warm extrusion molding.
Spiral seam steel pipe is made of strip coil as raw material, extruded at room temperature and welded by automatic double-wire double-sided submerged arc welding process.
Spiral seam steel pipe is made of strip coil as raw material, extruded at room temperature and welded by automatic double-wire double-sided submerged arc welding process.