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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 -
What is the difference between hot-dip galvanized steel pipe and hot-dip galvanized steel pipe SC
1. Different representations: Hot-dip galvanized steel pipes generally refer to the standard nominal diameter of water pipes. The written symbol is DN. Hot-dip galvanized steel pipe SC means that the conductors are laid through steel pipes (low-pressure fluid welded steel pipes). SC is ordinary w...Read more -
Large-diameter steel pipe forming methods and flaw detection qualification standard parameters
Large diameter steel pipe forming method: 1. Hot push expansion method: The push expansion equipment is simple, low-cost, easy to maintain, economical, and durable, and the product specifications are flexible. If you need to prepare large-diameter steel pipes and other similar products, you only ...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 -
What environments are large-diameter steel pipes suitable for
1. Petrochemical: crude oil, refined oil, petrochemical raw materials, and finished product transportation pipes and oil field pipeline networks. 2. Natural gas: submarine and onshore long-distance pipelines; gas receiving station gas transmission pipelines; gas fields and urban natural gas pipel...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 -
Classification and uses of stainless steel tees
Common pipeline-connecting tools include elbows, flanges, tees, etc. They play the role of connectors in pipelines. Tee is a common connecting element in the pipeline system. There are two production methods: hydraulic bulging and hot pressing. According to the requirements of the use occasion, t...Read more
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