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National Standard Spiral Steel Pipe, referred to as 9711.1 Spiral Steel Pipe, 9711.2 Spiral Steel Pipe, Material Classification: 16Mn Spiral Steel Pipe, Q345B Spiral Steel Pipe, L245 Spiral Steel Pipe, L360 Spiral Steel Pipe, X40-X80 Spiral Steel Pipe, Main Use, Spiral Steel Pipe for Sewage Treatment, Spiral Steel Pipe for Water Purification, Spiral Steel Pipe for Power Plant, Chemical Enterprise, Spiral Steel Pipe for Nuclear Power Plant, etc. Spiral steel pipe for conveying flammable fluid, spiral steel pipe for conveying non-flammable fluid, national standard spiral steel pipe and SY/T5037 spiral steel pipe of Ministry of Petroleum. This product is made of hot-rolled steel strip, which is usually spirally formed at normal temperature and welded by automatic submerged arc welding process. The product implements API_SPEC_5L, EN10217, GB/T9711.1 and GB/T9711.2 standards. It is mainly used to transport combustible and non-combustible fluids and steel structures in the petroleum and natural gas industries. Theoretical formulas for helical steel tubes and other steels, such as