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What is the difference between welded steel pipe and welded spiral steel pipe
Welded steel pipe refers to a steel pipe with seams on the surface, which is made by bending and deforming steel strips or steel plates into circular, square, and other shapes and then welding them. The blank used for welded steel pipes is a steel plate or strip. Since the 1930s, with the rapid d...Read more -
Application of straight seam steel pipes in pressure pipelines
The nominal diameter of straight seam steel pipe refers to the series of diameter dimensions specified in the standard of straight seam steel pipe. For straight seam steel pipes, pipe fittings, valves, etc., the nominal straight seam steel pipe diameter is represented by a series specified in the...Read more -
Industrial spiral steel pipe details
Spiral steel pipe production process: It is a spiral seam steel pipe welded by automatic double-wire double-sided submerged arc welding process using strip steel coil plate as raw material, constant temperature extrusion molding. (1) Raw materials, namely strip coils, welding wires, and flux, mus...Read more -
Details of H-shaped steel
H-shaped steel is an economical cross-section profile with a cross-section shape similar to the capital Latin letter H. It is also called a universal steel beam, wide-edge (edge) I-beam, or parallel-edge (flange) I-beam. It is different from the one that has been used in China for a long time. Ho...Read more -
Comparison of die-casting techniques and reagents for straight seam steel pipes
Straight seam steel pipe products are widely used in water supply projects, the petrochemical industry, the chemical industry, the electric power industry, agricultural irrigation, and urban construction. They are among the 20 key products developed in our country. Straight seam steel pipes are u...Read more -
Thick-walled steel pipe production steps and the phenomenon of inferior steel pipes
Thick-walled steel pipes: Steel pipes whose outer diameter to wall thickness ratio is less than 20 are called thick-walled steel pipes. It is mainly used as petroleum geological drilling pipes, cracking pipes for the petrochemical industry, boiler pipes, bearing pipes, and high-precision structur...Read more -
Causes and cutting methods of slag inclusion in straight seam steel pipes
Slag inclusion in welded steel pipes is the molten slag remaining inside the weld. From a theoretical analysis, the main reasons for slag inclusions in submerged arc automatic welding welds are the following three points: ① There are many inclusions in the raw materials (including base metal, wel...Read more -
How to prevent steel pipes from decarburizing
Once decarburization of steel pipes occurs during the production process, it will affect the subsequent processes and reduce the steel pipe’s high-quality performance and service life. Therefore, manufacturers usually take appropriate measures to avoid or solve this problem. Generally speak...Read more -
Analysis of factors affecting the process of high-frequency straight seam welded pipes
The main process parameters of high-frequency straight seam welded pipes include welding heat input, welding pressure, welding speed, opening angle size, the position and size of the induction coil, the position of the resistor, etc. These parameters have a great impact on improving the quality o...Read more -
How to distinguish welded steel pipes and seamless steel pipes
1. Metallographic method: Metallographic method is the main method to distinguish welded steel pipes and seamless steel pipes. High-frequency resistance welded steel pipes do not add welding materials, so the weld seam in the welded steel pipe is very narrow. If the method of rough grinding and c...Read more -
How to identify counterfeit thick-walled seamless steel pipes
1. Fake and inferior thick-walled seamless steel pipes are prone to folding. Folds are various fold lines formed on the surface of thick-walled seamless steel pipes. This defect often runs throughout the longitudinal direction of the product. The reason for folding is that shoddy manufacturers pu...Read more -
Straight seam welded steel pipe quenching technology
The surface quenching and tempering heat treatment of straight seam welded steel pipes is usually carried out by induction heating or flame heating. The main technical parameters are surface hardness, local hardness, and effective hardened layer depth. Hardness testing can be done with a Vickers ...Read more
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