Spiral steel pipe is a spiral seam steel pipe made of strip steel coil as raw material, often formed by warm extrusion and welded by automatic double wire double-sided submerged arc welding process.
The advanced double-sided submerged arc welding process can realize welding at the best position, which is not easy to have defects such as misalignment, welding deviation and incomplete penetration, and it is easy to control the welding quality.
SY / t5037-2008 is the standard set by the Ministry of petroleum, which is generally called the ministry standard.