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Seamless steel pipe performance, use and types

Published Time:

2022-06-07

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Summary

A crucial aspect of the quality of precision welded tubes is the removal of burrs from inside the weld seam. Due to spatial constraints, the removal of internal burrs in small-diameter welded tubes has always been a technical challenge in the welded tube manufacturing industry. Therefore, selecting a suitable welding method from the welding technology aspect is an effective way to solve the problem. Welding methods that produce welds with small internal burrs include direct current welding and square wave resistance welding. These welding methods are characterized by uniform heating, smooth weld seams, good quality, and the formation of very small internal burrs, generally only 0.1～0.2㎜.

1. General carbon steel is domestic seamless steel pipe provided according to product organizational characteristics. GB/T700-88 Class A steel is selected (but sulfur content must not exceed 0.050%, and phosphorus content must not exceed 0.045%), and its mechanical properties should meet the values required in GB8162-87 table.

　　2. Domestic seamless pipes should be determined as standard water pressure tests according to water pressure tests.

　　3. The process performance inspection of imported seamless steel pipes should comply with the relevant specifications stipulated in the contract.

　　II. Main Uses 2.1. Seamless steel pipes are general-purpose. Ordinary seamless steel pipes are cold-rolled from ordinary carbon alloy structural steel, low-alloy tool steel, or alloy tool steel. They have high production volume and are mainly used for liquid transportation pipelines or structural components.

　　2.2. Products supplied according to their main uses are divided into three categories: a, supplied according to composition and mechanical properties; b, supplied according to mechanical properties; c, supplied according to water pressure tests. Seamless steel pipes supplied according to categories a and b must also undergo water pressure tests for better resistance to liquid pressure.

　　Special seamless steel pipes include seamless steel pipes for heating furnaces, seamless steel pipes for geological environments, and seamless steel pipes for crude oil, etc.

　　III. Types.

　　Seamless steel pipes can be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, and extrusion-formed pipes, etc., according to different manufacturing processes.

　　According to appearance design, they are divided into round pipes, shaped pipes, etc. In addition to square pipes and rectangular pipes, there are also stainless steel round pipes, semi-circular pipes, triangular pipes, hexagonal pipes, convex pipes, plum blossom pipes, etc.

　　According to different raw materials, they are divided into ordinary carbon structural pipes, alloy structural steel pipes, high-quality carbon structural pipes, aluminum alloy structural pipes, stainless steel pipes, etc.

　　3.4. According to their unique main uses, there are steam pipes, geological pipes, oil pipes, etc.

Keywords:

How to calculate the yield point of seamless square tube

How to identify thick-walled seamless steel pipes?

More Information

How to calculate the yield point of seamless square tube

For metallic materials exhibiting yield phenomenon, the stress at which the specimen continues to elongate without any increase in force (the force remains constant) during tensile testing is called the yield point. If the force decreases, the upper and lower yield points should be distinguished. The unit of yield point is N/mm2 (MPa).

2022-06-11

Seamless steel pipe performance, use and types

2022-06-07

How to identify thick-walled seamless steel pipes?

In the actual trading environment, the quality of Jiangsu seamless steel pipes is uneven, and there are many counterfeit and inferior products. So how to identify thick-walled seamless steel pipes? The following is an introduction: Counterfeit Jiangsu seamless steel pipes often have rough surfaces. The uneven surface refers to the irregular raised defects on the surface of Jiangsu seamless steel pipes caused by serious groove wear. This is because Jiangsu seamless steel pipe manufacturers excessively pursue profits, and the rolling groove process has not been replaced. Counterfeit and inferior Jiangsu seamless steel pipes are prone to scarring on the surface There are two reasons for this: on the one hand, the quality of Jiangsu seamless steel pipes is uneven, and there are more impurities; on the other hand, the manufacturer's guide device is not good, it is easy to stick steel, and impurities are easy to leave scars on the surface of the stainless steel pipe after rolling. Counterfeit wood surfaces are prone to cracking The reason for cracking is that the billet is an earth billet, and the earth billet has larger pores. The earth billet is easily cracked under the influence of thermal stress during cooling, causing cracks in the stainless steel pipe after rolling.

2022-06-07

Tianjin Jinnuo Steel Pipe Co., Ltd.

The company's main products are straight seam steel pipes (straight seam welded pipes) and square pipes; the auxiliary products are hot-expanded steel pipes, hot-rolled steel pipes, large-diameter shaped steel pipes (large-diameter steel pipes), welded steel pipes, and galvanized pipes. We supply at low prices all year round, with guaranteed quality, good reputation and credibility, and are trustworthy.

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