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Large diameter straight seam steel pipe
- Product Description
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Product Introduction
Large diameter straight seam steel pipe generally refers to the straight seam steel pipe with an outer diameter of more than 500mm, the maximum diameter of double weld can reach 2020mm, and the maximum diameter of single weld can reach 1220mm.
Material
Large diameter straight seam steel pipe commonly used materials are Q235A, Q235B, 16Mn, 20#, Q345, L245, L290, X42, X46, X70, X80, 0Cr13, 1Cr17, 00 Cr19Ni11, 1 Cr18Ni9, 0Cr18Ni11Nb
Process flow
Large diameter straight seam steel pipe is mainly based on double-sided submerged arc welding production process, the product through bending, seam, internal welding, external welding, straightening, flat head and other processes, to meet the relevant standards.
Use
Large-diameter straight-seam steel pipe is the best choice for large-scale pipeline projects, water and gas transmission projects, and urban pipe network construction. The national west-east gas pipeline uses 200000 tons of this type of steel pipe, and the market prospect is broad.
The steel pipe shall be subjected to mechanical property test, tensile test, bending test, flattening test, guided bending test and hydraulic test, and shall meet the requirements specified in the standard. The steel pipe should be able to withstand a certain internal pressure, the maximum test pressure is 5.05Mpa, the holding time is not less than 5S, and the steel pipe does not leak during the experiment. In lieu of hydraulic testing, ultrasonic testing or eddy current testing is permitted for electric resistance welded steel pipes. Submerged arc welded steel pipes are allowed to have ultrasonic flaw detection or radiographic flaw detection instead of hydraulic test.
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