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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 -
The difference between reinforced 3PE anti-corrosion steel pipes and ordinary 3PE anti-corrosion steel pipes
Currently, there are two standards for 3PE anti-corrosion steel pipes, namely GB/T 23257-2009 and GB/T 23257-2017. GB/T 23257-2017 is a new standard and was implemented in December 2017. The two standards differ mainly in the following aspects: 3PE anti-corrosion steel pipe 1. The design temperat...Read more -
Detailed explanation of spiral steel pipe production process and process characteristics
Spiral steel pipe production process (1) Raw materials include steel strip coil, welding wire, and flux. They must undergo strict physical and chemical inspections before being put into use. (2) The head and tail of the steel strip are butt-jointed using single-wire or double-wire submerged arc w...Read more -
Defects of anti-corrosion of steel pipes coated with epoxy coal pitch paint
1) During on-site construction, the curing of epoxy resin is affected by temperature, the curing is slow, and the construction period is long. 2) Since a large amount of solvent is added during construction, it is easy for some construction units to have the opportunity to cut corners (add more s...Read more -
Submerged arc steel pipe forming method
Submerged arc steel pipe forming methods include continuous twist forming (HME), roll forming method (CFE), Uing Oing Expanding forming method (UOE), roll bending forming method (RBE), Jing Cing Oing Expanding forming method (JCOE), etc. However, three forming methods, UOE, RBE, and JCOE, are wid...Read more -
How to treat the surface of high frequency welded steel pipe
1.Cleaning. Solvents and emulsions are used to clean the surface of the steel to remove oil, grease, dust, lubricants, and similar organic matter, but it cannot remove rust, oxide scale, solder, etc. on the surface of the steel, so it is only used as an auxiliary means in anti-corrosion productio...Read more -
Production process of large-diameter straight seam steel pipe
A large-diameter longitudinally welded pipe is a general term. It is produced by a steel strip. The pipes that are welded by high-frequency welding equipment are called longitudinally welded pipes. (The name is given because the welds of the steel pipe are in a straight line). Among them, accordi...Read more -
Seamless steel pipe quality inspection
1. Chemical composition analysis Both instrumental analyses and chemical analyses can be used. The samples used for chemical analysis are smelt samples, ingot drill chips samples, and pipe samples. The smelt sample generally adopts the instrumental analysis method, and the finished pipe sample ad...Read more
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