Specifications and models of steel pipes Classification of rust steel pipes

Specifications and models of steel pipes Classification of rust steel pipes

Steel pipe is a kind of hollow long steel, widely used for conveying fluid pipeline, such as oil, natural gas, water, gas, steam, etc. In addition, in bending, torsional strength is the same, light weight, so it is also widely used in the manufacture of mechanical parts and engineering structure. Also commonly used for the production of a variety of conventional weapons, barrels, shells, etc. What kinds of steel pipes do you have? What are the specifications and models of steel pipes?

Classification of rusty steel pipe

1. Classification by production method

(1) Seamless pipe - cold drawn pipe, extrusion pipe, cold rolled pipe

Stainless steel seamless steel pipe

Stainless steel seamless steel pipe is a kind of hollow section, no joints around the strip of steel.

Manufacturing process and flow of seamless steel pipe

Smelting > ingot > Rolling > Sawing > peeling > perforating > Annealing > Pickling > ash > cold drawing > cutting > Pickling > storage

The characteristics of seamless steel pipe

It is not difficult to see from the above process flow:

First, the thicker the wall thickness of the product, the more economical and practical it is, the thinner the wall thickness, its processing costs will rise substantially;

Secondly, the process of the product determines its limitations. Generally, the precision of seamless steel pipe is low: uneven wall thickness, low internal surface brightness, high measuring cost, and the internal surface and pitting and black spots are not easy to remove;

Third, its detection and shaping must be processed offline. Therefore, it reflects its superiority in high pressure, high strength, mechanical structure materials.

(2) Welding pipe

(a) Classification by process -- gas shielded welded pipe, arc welded pipe, resistance welded pipe (high frequency, low frequency)

(b) According to the weld, it can be divided into straight welded pipe and spiral welded pipe

Stainless steel welded steel pipe

Welded steel pipe, referred to as welded pipe, is a steel pipe made of steel plate or steel strip after being crimped by the unit and mold.

Manufacturing process and flow of welded steel pipe

Steel plate > slicing > forming > melting > induction bright heat treatment > internal and external pass treatment > shaping > Sizing > Eddy current testing > laser sizing > Pickling > storage

Characteristics of welded steel pipe

It is not difficult to see from the above process flow: first, the product is continuous online production, the thicker the wall thickness, the greater the investment of the unit and melting equipment, the less economical and practical it is. The thinner the wall thickness, the lower the input-output ratio. Secondly, the process of the product determines its advantages and disadvantages. Generally, the welding steel pipe has high precision, uniform wall thickness, high internal surface brightness (steel pipe surface brightness determined by the surface grade of the steel plate), and can be arbitrarily measured. Therefore, it shows its economy and aesthetics in high precision, medium and low pressure fluid applications.

2, according to the section shape classification

(1) Round steel pipe

(2) Rectangular tube

3. Classification by wall thickness

(1) Thin-walled steel pipe

(2) thick wall steel pipe

4. Classification by use

(1) Civil pipe: round pipe, rectangular pipe, flower pipe, generally used for decoration, construction, structure and so on;

(2) Industrial pipe: industrial distribution pipe, general distribution pipe (drinking water pipe), mechanical structure/fluid conveying pipe, boiler heat exchange pipe, food sanitation pipe, etc. Generally used in various fields of industry such as: petrochemical, paper, nuclear energy, food, beverage, medicine and other industries on the fluid medium requirements of higher pipeline.

Specifications and models of steel pipes

Product name Specification, model standard name Standard number

Steel pipe: Φ6 ~ 630x 1 ~ 50mm, stainless steel pipe for fluid transmission: GB/T14976-2002

Steel pipe: Φ6 ~ 630x 1 ~ 50mm, seamless stainless steel pipe for structure: GB/T14975-2002

Steel pipe: Φ6 ~ 630x 1 ~ 50mm, stainless steel pipe for boiler and heat exchanger: GB13296-91

Steel welded pipe: Φ219 ~ 1200x 3 ~ 20mm, stainless steel pipe for fluid transmission: GB12770-2002