1. High-quality square and rectangular pipes for low-pressure fluid transport, standard number GB/T3091-2008. Representative materials include Q235A, Q235B, and Q345B. These pipes are primarily utilized for the transportation of water, gas, air, oil, as well as heated hot water or steam, making them suitable for general low-pressure fluids.
2. High-quality square and rectangular pipes designed for low-pressure fluid transport, standard number GB/T3092-2008. The representative materials remain consistent with those mentioned above. These pipes are mainly employed to convey water, gas, air, oil, and other general low-pressure fluids such as heated hot water or steam. The outer surface of the square pipe is treated with either hot-dip galvanizing or cold galvanizing to enhance corrosion resistance.
3. Welded high-quality square and rectangular pipes for mining liquid transport conforming to standard number GB/T14291-2000. The representative material is Q235A grade B steel. These pipes are predominantly used in mining applications for pressure air delivery, drainage systems, and shaft exhaust through straight seam welded construction.
4. Large-diameter welded high-quality square and rectangular pipes suitable for low-pressure fluid transport according to standard number GB/T14980-1994. The representative material is classified as Q235AB grade steel. They are primarily intended for transporting water, sewage, gas, air along with other low-pressure fluids such as heated steam.
5. Mechanical structure stainless steel high-quality square and rectangular pipes, standard number GB/T12770-1991. Representative materials: 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc. Mainly used for mechanical parts and structural components in machinery, automobiles, bicycles, furniture, and hotel and restaurant decoration.
6. Stainless steel welded high-quality square and rectangular pipes for fluid transport, standard number GB/T12771-1991. Representative materials include 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc. Mainly used to transport low-pressure corrosive media.
7. Low-pressure transport spiral high-quality square and rectangular pipes (Ministry of Petroleum standard), standard number SY/T5037-2008. Representative material.
