Large-caliber straight seam steel pipe refers to outer diameter of 500mm or more straight seam steel pipe, currently double welded seam maximum caliber can reach 2020mm, single welded seam maximum caliber can reach 1220mm. Large-caliber straight seam steel pipe in the country generally adopts GB/T3091-2008, GB/T9711.1-1997, API 5L standards. Large caliber straight seam steel tubes are mainly used in two-sided buried arc welding production process, products are curved, joined seam, internal welding, external welding, straightening, flat head and other processes, to meet the relevant standard requirements.

Large diameter straight seam steel tubes commonly used materials are Q235A、Q235B、16Mn、20#、Q345、L245、L290、X42、X46、X70、X80、0Cr13、1Cr17、00Cr19Ni11、1Cr18Ni9、0Cr18Ni11Nb.

Large caliber straight seam steel tubes are mainly used in two-sided buried arc welding production process, products are curved, joined seam, internal welding, external welding, straightening, flat head and other processes, to meet the relevant standard requirements.

Big caliber straight seam steel pipe is the best choice for large pipeline engineering, water transmission and gas engineering, city pipe network construction, the country west gas east transmission uses this type of steel pipe to reach 200,000 tons, the market prospects are large.

Quality inspection of large diameter straight seam steel tubes

Në kë de GB/T3091-2008 "Welded Steel Pipe for Low Pressure Fluid Transport" standard, piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny de piny

Steel pipe should do mechanical performance testing, tensile testing, bending testing, flattening testing, directional bending testing and hydraulic testing, and to meet the requirements of the standard. Steel pipe should do mechanical performance testing, tensile testing, bending testing, flattening testing, directional bending testing and hydraulic testing, and to meet the requirements of the standard. Steel pipe adhil bï ya tɔ̈ɔ̈u në kë de tɛ̈n yenë yen tɔ̈ɔ̈u thïn, tɛ̈n yenë yen tɔ̈ɔ̈u thïn në kë de tɛ̈n yenë yen tɔ̈ɔ̈u thïn në kë de tɛ̈n yenë yen tɔ̈ Resistance welded steel tubes allows for ultrasonic detection or vortex detection to replace hydraulic tests. A ye cɔl arc welded steel pipe, a ye cɔl ultrasonic detection test wala ray detection test, a ye cɔl hydraulic test.