Stainless steel pipe According to the material is divided into ordinary carbon steel pipe, high-quality carbon structure steel pipe, alloy structure pipe, alloy steel pipe, bearing steel pipe, stainless steel pipe and in order to save precious metals and meet special requirements of bimetallic composite pipe, coating and coating pipe. Stainless steel tubes vary in variety and use, with different technical requirements and different production methods. The outer diameter range of the steel pipe currently produced is 0.1-4500mm and the wall thickness range is 0.01~250mm.
In order to distinguish its characteristics, steel tubes are usually classified according to the following methods.
Stainless steel pipe According to the mode of production is divided into seamless pipe and welded pipe two categories, seamless steel pipe can be divided into hot rolling pipe, cold rolling pipe, cold drawing pipe and extrusion pipe, cold drawing and cold rolling is two times processing of steel pipe, welded pipe is divided into straight seam welded pipe and spiral welded pipe.
Stainless steel pipe According to the cross-sectional shape can be divided into round tubes and special-shaped tubes. The special-shaped tube has rectangular tube, rhomboid tube, elliptical tube, six square tube, octagon tube and various cross-sectional asymmetric tubes and so on. Shaped tubes are widely used in a variety of structural parts, tools and mechanical parts.
Compared with the circular tube, the special-shaped tube generally has a larger inertial moment and section modulus, has a larger bending, anti-torsion ability, can greatly reduce the weight of the structure, saving steel.
Stainless steel pipe According to the profile shape can be divided into equal section tube and variable section tube.
The variable section tube has a conical tube, a ladder tube and a periodic section tube.
Pipe End shape.
Stainless steel pipe According to the pipe end state can be divided into light tube and car wire tube (with threaded steel pipe). The wire pipe can be divided into ordinary car wire pipe (conveyor water, gas and other low-pressure pipe, the use of ordinary cylindrical or conical pipe threaded connection) and special threaded pipe (oil, geological drilling pipe, for important car wire pipe, the use of special threaded connection), some special pipe, in order to make up for the impact of thread on the strength of the pipe
Usually in front of the wire before the Tube end thickening (internal thickening, external thickening or internal and external thickening).
According to the use can be divided into oil well pipe (casing, tubing and drill pipe, etc.), pipeline pipe, boiler pipe, mechanical structure pipe, hydraulic prop pipe, gas cylinder tube, geological pipe, chemical pipe (high-pressure fertilizer pipe, oil cracking pipe) and ship pipe.
Stainless steel welded pipe production process:
Raw materials-strip-welding pipe-repair-polishing-Inspection (spray printing)-Packaging-Shipping (warehousing) (decorative welded pipe). Raw materials-strip-welding pipe-heat treatment-correction-straightening-repair end-pickling-water pressure test-inspection (spray printing)-Packaging-Shipment (warehousing) (welded pipe industry piping).
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