One, Galvanized Welded Square Pipe for Low Pressure Fluid Transmission, with the standard number GB/T3091-2008. The representative materials include Q235A, Q235B, and Q345B. Mainly used for transmitting water, coal gas, air, oil, heating hot water, or steam, and its application is limited to low-pressure fluids.
Secondly, galvanized焊接 steel rectangular tubes for low-pressure fluid conveyance, with the standard GB/T3092-2008. The representative material is the same as above. These tubes are mainly used for conveying low-pressure fluids such as water, coal gas, air, oil, heating hot water, or steam. The exterior surface of the rectangular tubes is treated with hot-dip galvanizing or cold-dip galvanizing for corrosion prevention.
Three: Mine fluid transmission welding rectangular tubes, standard number GB/T14291-2000. Represented material: Q235A, B-grade steel. Mainly used for straight seam welding rectangular tubes in mine air pressure, drainage, and shaft gas release.
Four, Large diameter electric-welded square tubes for low-pressure fluid transmission, with the standard number GB/T14980-1994. The representative material is Q235AB grade. Mainly used for the transmission of low-pressure fluids such as water, wastewater, gas, air, and heating steam.
Section 5: Welded stainless steel square tubes for mechanical structures, with standard GB/T12770-1991. Representing materials include 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc. Primarily used in mechanical equipment, automobiles, bicycles, furniture, hotel and restaurant decoration, and other mechanical components and structural parts.
Section 6: Stainless steel welded square tubes for fluid conveyance, with the standard number GB/T12771-1991. The representative materials include 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc. Mainly used for conveying low-pressure corrosive media.
Seven, Helical steel pipes for low-pressure conveyance (Ministry of Petroleum standard)? Standard number: SY/T5037-2008. Representative materials include Q235B, Q345B, and other carbon steel grades. Mainly used for low-pressure conveyance of water, oil, natural gas, heating, and other pipelines.
Section 8: Square tubes for conveying flammable and non-flammable fluids, with standard GB/T9711.1 (GB/T9711.2) - 1997. The material grades represented are L245-L415, etc., for pipeline steel. Primarily used for square tubes conveying low or high-pressure flammable and non-flammable fluids, with high requirements. Mainly used in engineering construction, glass curtain walls, door and window decorations, steel structures, guardrails, machinery manufacturing, automotive manufacturing, home appliance manufacturing, shipbuilding, container manufacturing, power, agricultural construction, greenhouses, bicycle frames, motorcycle frames, shelves, fitness equipment, leisure and travel products, steel furniture, various specifications of oil casing, oil pipes, and pipeline pipes, water, gas, sewage, air, heating, and other fluid conveyance, fire protection, and support structures, as well as the construction industry.