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Welding technology and production method of large-diameter straight seam steel pipes
1. Control of the weld gap The strip steel is sent to the welded steel pipe unit, after rolling by multiple rollers, the strip steel is gradually rolled up to form a round tube blank with an open gap, and the reduction of the squeeze roller is adjusted to control the weld gap to 1~3mm, And make t...Read more -
How to do electric welding of spiral steel pipe
When using spiral steel pipes, how to do the actual operation of electric welding? Next, let’s talk to friends. Before using spiral steel pipes, it is necessary to use deoxidizers to do deoxidation work. During the operation, the number and size of debris will be reduced. It should be understood ...Read more -
What should be done at the end of cooling of large-diameter steel pipes
(1) When the cooling is over, that is, when the temperature of the surface layer and the core part are all the same, the elastic deformation of the surface layer and the core part also disappears and return to the original state. Although instantaneous thermal stress is generated during the cooli...Read more -
What requirements should be met for weld repair of pressure steel pipes
(1) Before repair, the causes of steel pipe defects should be analyzed and corresponding repair measures should be proposed. (2) When reworked steel pipes require repair welding, qualified welding processes should be used and welded by qualified welders. (3) When the number of repairs for the sam...Read more -
What is a stainless steel profile
Stainless steel profiles are stainless steel materials with different cross-sectional shapes obtained by hot melting and extruding stainless steel rods. The production process of stainless steel profiles mainly includes three processes: casting, extrusion, and coloring. Among them, coloring mainl...Read more -
Embroidery removal technology for submerged arc steel pipes
Introduction to the embroidery removal technology of submerged arc steel pipes: During the anti-corrosion construction process of oil and gas pipelines, the surface treatment of large-diameter submerged arc steel pipes is a key factor that determines the anti-corrosion service life of the pipelin...Read more -
What is the difference between high-pressure boiler steel tubes and low- and medium-pressure boiler steel tubes
The differences between high-pressure boiler steel tubes and low- and medium-pressure boiler steel tubes are as follows: 1. Different implementation standards High-pressure boiler steel tube implementation standard: GB/T5310-2018 Low and medium pressure boiler steel tube implementation standards:...Read more -
What is the main function of valves
Valves are pipeline accessories used to open and close pipelines, control flow direction, and adjust and control the parameters (temperature, pressure, and flow) of the conveyed medium. According to their functions, they can be divided into shut-off valves, check valves, regulating valves, etc. V...Read more -
Non-destructive testing of steel pipe fittings
The relevant provisions in the national standard for steel pipe fittings “GB/T13401-2017 Technical Specifications for Steel Butt Welded Pipe Fittings”: 7.3 Non-destructive testing 7.3.1 Tees, crosses, press-formed reducers, and pipe caps formed by the direct cutting of bars of all mat...Read more -
The meaning and classification of stainless steel pipe corrosion
In a corrosive environment, the damage caused by chemical or electrochemical interactions between metal and surrounding media is called corrosion. In a corrosive environment, when stainless steel is improperly selected, corrosion will also occur. There are many classification methods for corrosio...Read more -
Production process of carbon steel welded pipe
Carbon steel welded pipes are mainly divided into three processes: electric resistance welding (ERW), spiral submerged arc welding (SSAW) and straight seam submerged arc welding (LSAW). The carbon steel welded pipes produced by these three processes have their own positioning in the application f...Read more -
Advantages and disadvantages of thermal expansion carbon steel pipes
At present, steel pipes are widely used and have many types. Thermal expansion carbon steel pipe is one of them. It has many advantages, but of course it is not without any disadvantages. The following is a detailed explanation of the advantages and disadvantages of hot-expanded steel pipes by ca...Read more