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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 -
Definition, functions, and standard codes of high-frequency welded steel pipes
1. Welded steel pipes for low-pressure fluid transportation (GB/T3092-1993) are also called generally welded pipes, commonly known as black pipes. It is a welded steel pipe used to transport water, gas, air, oil, heating steam, and other general lower-pressure fluids and other purposes. The wall ...Read more -
Installation points of stainless steel elbow
1. Before installation, carefully check the various standards of the stainless steel elbow to see if the diameter meets the usage requirements, eliminate defects caused by the transportation process, and eliminate the dirt on the stainless steel elbow. Make preparations before installation and be...Read more -
Hardness index of anti-corrosion spiral steel pipe
The ability of a metal material to resist surface indentation by hard objects is called hardness depending on the test method and scope of application. Hardness can be divided into Vickers hardness, Shore hardness, Brinell hardness, Rockwell hardness, microhardness, and high-temperature Hardness,...Read more
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