Classification of steel pipes

Classification of steel pipes

I. According to the production method

Steel tubes can be divided into two categories according to production methods: seamless steel tubes and welded steel tubes, welded steel tubes referred to as welded pipe.

1. Seamless steel pipe can be divided into hot-rolled seamless pipe, cold-drawn pipe, precision steel pipe, heat diffuser, cold spinning pipe and extrusion pipe according to production methods.

Seamless steel tubes are made of high quality carbon steel or alloy steel, hot rolled, cold rolled (pull).Bales of steel pipe

2. Welded steel tubes can be divided into furnace welded pipe, electric welding (resistance welding) pipe and automatic arc welding pipe due to their different welding processes, which can be divided into straight seam welded pipe and spiral welded pipe due to the different welding forms, and circular welded pipe and special-shaped (square, flat, etc.) welded pipe due to the shape of its end.

The welded steel pipe is made of steel rolled into tubes and welded to opposite or spiral joints. In terms of manufacturing methods, it is also divided into welded steel pipe for low-pressure fluid transmission, welded steel pipe with spiral joints, directly rolled steel pipe, and welded steel pipe with spiral joints.Seamless steel tube can be used in various industries of liquid pressure pipelines and gas pipelines.Welding pipeline can be used for water pipeline, gas pipeline, heating pipeline, electrical pipeline, etc.

Two, according to the material

Steel pipe can be divided into carbon pipe and alloy pipe, stainless steel pipe and so on.

Carbon pipe can be divided into ordinary carbon steel pipe and high quality carbon structure pipe.

Alloy pipe can be divided into: low alloy pipe, alloy structure pipe, high alloy pipe, high strength pipe.Bearing tube, acid resistant tube, precision alloy (such as cutting alloy) tube and superalloy tube, etc.

Iii. Classification by connection mode

Steel pipe can be divided into light pipe (pipe end without thread) and turning wire pipe (pipe end with thread) according to the connection mode of pipe end.

Turning wire tube is divided into: ordinary turning wire tube and tube end thickening turning wire tube.

Thickening wire pipe can also be divided into: external thickening (with external thread), internal thickening (with internal thread) and internal thickening (with internal thread) and other ground wire pipe.

If the type of thread can also be divided into: ordinary cylindrical or tapered thread and special thread such as ground wire pipe.

In addition, according to the needs of users, wire pipes are generally equipped with pipe connectors for delivery.

Four, according to the plating characteristics

According to surface coating characteristics of steel tubes can be divided into: black tube (not coated) and coated tube.

Coated tubes are galvanized tubes, aluminized tubes, chrome plated tubes, aluminized tubes and other steel tubes with alloy layers.

The coating pipe has the outer coating pipe, the inner coating pipe, the inner coating pipe.Commonly used coatings are plastic, epoxy, coal tar epoxy and a variety of glass - type anticorrosive coatings.Galvanized pipe is divided into KBG pipe, JDG pipe, threaded pipe and so on

Five, according to the purpose

1. Pipes for plumbing.Such as: water, gas pipe, steam pipe with seamless pipe, oil transport pipe, oil and natural gas trunk with the pipe.Agricultural irrigation water faucet with pipe and sprinkler irrigation pipe.

2. Pipes for thermal equipment.Such as general boiler boiling-water pipe, superheated steam pipe, locomotive boiler heat pipe, smoke pipe, small smoke pipe, arch brick pipe and high temperature and high pressure boiler pipe.

3. Pipes for mechanical industry.Such as aeronautical structure tube (round tube, oval tube, flat oval tube), automobile axle tube, axle tube, automobile tractor structure tube, tractor oil cooler tube, agricultural machinery for square and rectangular tube, transformer tube and bearing tube, etc.

4. Petroleum geological drilling pipe.Such as: oil drilling pipe, oil drill pipe (kelly and hexagonal drill pipe), drilling, oil tubing, oil casing and various pipe joints, geological drilling pipe (core pipe, casing, active drill pipe, drilling, press hoop and pin joint, etc.).

5. Pipes for the chemical industry.Such as: petroleum cracking pipe, chemical equipment heat exchanger and pipe pipe, stainless acid-proof pipe, chemical fertilizer high-pressure pipe and transport chemical medium pipe, etc.

6. Pipes for other departments.Such as: container tube (high-pressure gas cylinder tube and general container tube), instrument tube, hand case tube, needle injection and medical equipment tube, etc. 

Vi. According to the shape of section

Steel pipe products of various types and specifications, its performance requirements are also various.All of these should be distinguished as user requirements or working conditions change.Generally, steel pipe products are classified according to section shape, production method, pipe material, connection mode, plating characteristics and use.

Steel pipe can be divided into round steel pipe and special-shaped steel pipe according to the shape of cross section.

Special - shaped steel tubes refer to all kinds of non - circular steel tubes.There are mainly: square tube, rectangular tube, elliptical tube, elliptical tube, semicircle tube, hexagonal tube, hexagonal tube, hexagonal tube, equilateral triangle tube, pentagonal quattro tube, octagonal tube, convex tube, double convex tube.Double concave tube, multi-concave tube, melon seed tube, flat tube, rhombus tube, star tube, parallelogram tube, ribbed tube, drop tube, inner finned tube, twisted tube, B tube, D tube and multi-layer tube, etc.

According to the shape of longitudinal section, steel tubes are divided into equal section and variable section.Variable-section (or variable-section) steel tubes refer to those whose section shape, inner and outer diameter and wall thickness change periodically or aperiodically along the direction of pipe length.It mainly has: the outer cone tube, the inner cone tube, the outer step tube, the inner step tube, the periodic section tube, the bellows tube, the spiral tube, the steel tube with the heat sink and the gun tube with the double line and so on.