First, classification of welded steel pipes are classified according to their uses: According to their uses, they are divided into generally welded steel pipes, galvanized welded steel pipes, oxygen-blown welded steel pipes, wire casings, metric welded steel pipes, idler pipes, deep well pump pipes, automotive pipes, transformer pipes, Electric welded thin-walled pipes, electric welded special-shaped pipes and spiral welded steel pipes.
Second, the application scope of welded steel pipes Welded steel pipe products is widely used in boilers, automobiles, ships, lightweight structural door and window steel for construction, furniture, various agricultural machinery, scaffolding, wire conduits, high-rise shelves, containers, etc. All can meet customer requirements, and special specifications of welded steel pipes can be processed according to user requirements.
Third, the theoretical calculation method of the weight of the welded steel pipe The theoretical calculation method of the weight of the welded steel pipe has the formula to follow; the theoretical weight of the steel pipe per meter (the density of the steel is 7.85kg/dm3) calculation formula: W=0.02466 (D-S)/S; Among them: W represents the theoretical weight of the steel pipe per meter, the unit is: kg/m; D represents the nominal outer diameter of the steel pipe, the unit is: mm; S represents the nominal wall thickness of the steel pipe, the unit is: mm.
Fourth, the official definition of welded steel pipe and industrial use. The blank used for welded steel pipe is a steel plate or strip. Due to different welding processes, it is divided into furnace-welded steel pipe, electrically welded (resistance welded) steel pipe, and automatic arc-welded steel pipe. Because of their different welding forms, they are divided into two types: straight seam welded steel pipes and spiral welded steel pipes. Because of their end shapes, they are divided into round welded steel pipes and special-shaped (square, flat, etc.) welded steel pipes.
Welded steel pipes are divided into the following varieties due to their different materials and uses:
1. GB/T3091-1993 (galvanized welded steel pipe for low-pressure fluid transportation) is mainly used to transport water, gas, air, oil, heating hot water or steam, and other general lower-pressure fluids and other pipes. Its representative material is Q235A grade steel.
2. GB/T3092-1993 (galvanized welded steel pipe for low-pressure fluid transportation) is mainly used to transport water, gas, air, oil, heating hot water or steam, and other general lower-pressure fluids and other pipes. Its representative material is Q235A grade steel.
3. GB/T14291-1992 (Welded steel pipe for mining fluid transportation) is mainly used for straight seam welded steel pipes for mine air pressure, drainage, and shaft gas discharge. Its representative materials are Q235A and B-grade steel. GB/T14980-1994 (Large-diameter electric welded steel pipe for low-pressure fluid transportation). Mainly used for transporting low-pressure fluids such as water, sewage, gas, air, heating steam, and other purposes. Its representative material is Q235A grade steel.
4. GB/T12770-1991 (stainless steel welded steel pipes for mechanical structures) are mainly used for machinery, automobiles, bicycles, furniture, hotel and restaurant decoration, and other mechanical components and structural parts. Its representative materials include 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.
5. GB/T12771-1991 (Stainless steel welded steel pipe for fluid transportation) is mainly used to transport low-pressure corrosive media. Representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc.
Post time: May-14-2024