1, according to the wall thickness classification - thin wall steel pipe, thick wall steel pipe 4, according to the use of classification - pipe, thermal equipment with steel pipe, steel pipe, oil, geological drilling with steel pipe, container steel pipe, chemical wealth with steel pipe, special purpose steel pipe, other seamless steel pipe with hollow cross-section, a large number of used as a pipeline for transporting fluid, Such as the transmission of oil, natural gas, gas, water and some solid materials of the pipeline. Since the circle area is the largest when the circumference is equal, more fluid can be transported with a circular tube.
2, according to the section shape classification (1) most of the section steel pipe - round steel pipe, square steel pipe, oval steel pipe, triangular steel pipe, hexagonal steel pipe, diamond steel pipe, octagonal steel pipe, semicircular steel circle, other (2) complex section steel pipe - unequal hexagonal steel pipe, five valves, double convex steel pipe, double concave steel pipe, melon seed steel pipe, conical steel pipe, wave Corrugated steel pipe, case steel pipe, other.
3, according to the production method classification (1) seamless pipe - hot rolled pipe, cold rolled pipe, cold drawn pipe, extrusion pipe, pipe jacking (2) welded pipe (a) according to the process - arc welded pipe, resistance welded pipe (high frequency, low frequency), gas welded pipe, furnace welded pipe (b) according to the weld pipe - straight seam welded pipe, spiral welded pipe.
4, GB5310-1995 (seamless steel pipe for high pressure boiler) is used for manufacturing high pressure and above the water pipe boiler heating surface with high quality carbon steel, alloy steel and stainless heat resistant steel seamless steel pipe. The material is 20G, 12Cr1MoVG, 15CrMoG, etc.
