Stainless steel industrial welded pipes, also known as industrial pipes, are formed by crimping steel plates or steel strips and then welding them. The production process of welded steel pipes is simple, the production efficiency is high, the specifications are complete, and only a small investment in capital equipment is required, but the strength of seamless steel pipes is usually low. Welded pipes are mainly used in industrial machinery, automobile exhaust, light industry, pharmaceuticals, papermaking, sewage water treatment, water supply, machinery and other fields; there are also a certain proportion in chemical, fertilizer, petrochemical and other industries, and the specifications are generally selected as Low‑pressure pipelines above Φ159 mm.

In the forming process, the steel pipe can be made of steel plate or strip steel. But its welding technology can be divided into furnace welded pipe, electric resistance welded pipe and automatic protection arc welded pipe; because of its different structural welding forms, it can be divided into two types: straight seam welded pipe and spiral welded pipe; its end shape can also be divided into circular welded pipe and special‑shaped welded pipes.

What are the executive standards for stainless steel industrial welded pipes? Welded pipes can be divided into the following six standards due to their different materials and uses:

1. GB/T3091‑1993 (low pressure fluid galvanized welded steel pipe). Mainly used for general conveying lower pressure fluids of water, gas, air, oil and heating hot water or steam pipes and other purposes. Carbon structural steel Q235A is indicated.
2. GB/T3092‑1993 (galvanized welded steel pipe for low‑pressure working fluid transportation). It can be mainly used in enterprises to transport water, gas, air, oil and heating water or steam and other general low‑cost pressure calculation fluids and other pipes for different purposes. It indicates that the product material is: carbon structural steel Q235A.
3. National standard GB/T14291‑2006 (electrically welded steel pipe for mine fluid transportation), mainly used for mine wind pressure, drainage, wellbore gas welded pipe with straight seam.. Represents the material of Q235A, B grade steel.
4. The national standard GB/T14980‑1994 (large‑diameter electric welded steel pipe for low‑pressure fluid transportation) is mainly used for conveying low‑pressure fluids such as water, sewage, gas, air, heating steam, etc., and adopts the material carbon structural steel Q235A.
5. GB/T12770‑2002 (stainless steel welded steel pipe for mechanical structure). Mainly used for machinery, automobiles, bicycles, furniture, decoration of hotels and restaurants, and other mechanical parts and structures. Materials SUS410S, SUS430, SUS302 indicate and so on.
6. GB/T12771‑2000 (stainless steel welded steel pipe for fluid transportation). It can be mainly used for corrosive environment medium of low pressure equipment in enterprise conveying system. Indicates that different materials are SUS410S, SUS430, SUS302 and so on.