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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 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 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.