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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 -
The difference between cold-drawn seamless steel pipe and hot-rolled seamless steel pipe
Cold drawn (rolled) seamless steel pipe: round tube blank → heating → perforation → heading → annealing → pickling → oiling (copper plating) multi-pass cold drawn (cold rolled) billet → heat treatment → straightening → Hydrostatic test (flaw detection) mark → Warehouse. Hot rolled (extruded seaml...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 -
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
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