JIS, DIN, ASTM, bs, JIS G3463-2006, JIS G3455-2005, JIS G3444-2006, JIS G3469-2002, JIS C8305-1999, JIS G3441, JIS G3466, DIN 1626, DIN 1629/3, DIN EN 10216-1-2004, DIN 1629/4, ASTM A182-2001, ASTM A671-2006, ASTM A234-2007, BS 4568, DIN EN
Steel with a hollow cross-section whose length is much larger than the diameter or circumference. According to the cross-sectional shape, it is divided into round, square, rectangular and special-shaped steel pipes; according to the material, it is divided into carbon structural steel steel pipes, low alloy structural steel steel pipes, alloy steel steel pipes and composite steel pipes; For thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment steel pipes, etc .; according to the production process is divided into seamless steel pipes and welded steel pipes, of which seamless steel pipes are divided into hot rolling and cold rolling (pulling) Two kinds, welded steel pipes are divided into straight seam welded steel pipes and spiral seam welded steel pipes.
Not only is steel pipe used for transporting fluids and powdered solids, exchanging heat energy, manufacturing mechanical parts and containers, it is also an economical steel. The use of steel pipes to manufacture the grids, pillars and mechanical supports of the building structure can reduce the weight and save 20-40% of the metal, and can realize the mechanized construction in factories. The use of steel pipes to manufacture roads and bridges not only saves steel and simplifies construction, but also greatly reduces the area of the protective coating, saving investment and maintenance costs.
Steel pipes can be divided into two categories according to production methods: seamless steel pipes and welded steel pipes. Welded steel pipes are simply called welded pipes.
1. Seamless steel tubes can be divided into hot rolled seamless tubes, cold drawn tubes, precision steel tubes, hot expanded tubes, cold spinning tubes and extruded tubes according to production methods.
Seamless steel tubes are made of high-quality carbon steel or alloy steel, and are divided into hot-rolled and cold-rolled (drawn).
Bundles of steel pipes
Bundles of steel pipes
2. Welded steel pipe is divided into furnace welded pipe, electric welding (resistance welding) pipe and automatic arc welded pipe due to different welding processes. Due to the different welding forms, it is divided into two types: straight seam welded pipe and spiral welded pipe. For round welded pipe and special-shaped (square, flat, etc.) welded pipe.
Welded steel pipes are welded by butt or spiral seam rolled steel tubes. In terms of manufacturing methods, they are divided into welded steel pipes for low-pressure fluid transportation, spiral seam welded steel pipes, direct coil welded steel pipes, and welded steel pipes. Seamless steel pipes can be used for liquid pressure pipes and gas pipes in various industries. Welded pipelines can be used for water pipelines, gas pipelines, heating pipelines, electrical pipelines, etc.