Stainless steel pipe according to the material can be divided into ordinary carbon steel, high quality carbon structural steel, alloy structural pipe, alloy steel, bearing steel, stainless steel tube, and to save precious metals and meet the special requirements of double metal composite tube, pipe coating and coating, etc. There are many types of stainless steel pipe, use different, its different technical requirements, production methods are also different. The current production of the range of 0.1-4500 mm steel pipe diameter and wall thickness range of 0.01 ~ 250 mm. To distinguish between its characteristics, are usually classified according to the following method for steel pipe.

Mode of production

Stainless steel pipe according to the mode of production divided into two categories: seamless pipe and welded pipe, seamless steel pipe and can be divided into hot rolled tube, cold rolling tube, cold drawn tube and extruded tube, etc., is cold drawing, cold-rolled steel pipe secondary processing; Welded pipe is divided into straight seam welded pipe and spiral welded pipe, etc.

The section shape

Stainless steel pipe according to the cross-sectional shape can be divided into circular tube and special-shaped tube. Special-shaped pipe with rectangular tube, the diamond, oval tube, six eight square tube and square tube, all kinds of tube for asymmetry, etc. Abnormity tube is widely used in all kinds of parts, tools and machinery parts. Compared with the circular tube, special-shaped tube usually have large moment of inertia and section modulus, have bigger bending and torsional capacity, can greatly reduce the structure weight, save steel.

Stainless steel pipe can be divided by profile shapes such as cross section pipe and variable cross section. Variable cross-section tube has a tapered tube, stepped pipe section and cycle, etc.

Tube shape

Stainless steel pipe according to the pipe end state can be divided into light and car wire tube (with thread steel tube). Car wire tube and can be divided into ordinary car wire tube (water, gas, such as low pressure tube, using common cylindrical or tapered pipe thread connection) and special thread tube (geology, oil drilling pipe, for important car wire tube, the use of special threaded connection), for some special tube, to compensate for the influence of the strength of pipe end of thread, often in a car wire before pipe end upset (internal upset, more external upset or inside and outside).

Use classification

According to use can be divided into oil well pipe (casing, tubing and drill pipe, etc.), line pipe, boiler pipe, mechanical structure, hydraulic prop, cylinder pipe, geological, chemical pipe (high pressure chemical fertilizer pipe, oil cracking pipe) and tube for ships, etc.