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Seamless steel pipes are pided into the following varieties due to their different uses: 1. GB/T8162-1999 (Seamless steel pipe for structure). Mainly used for general structure and mechanical structu...

Electric resistance welding (ERW) refers to a method that uses a strong current to pass through the contact point between the electrode and the workpiece, and heat is generated by the contact resistan...

ERW steel pipes are manufactured by low-frequency or high-frequency resistance "resistance". They are round pipes welded from steel plates with longitudinal welds. It is used to transport oil, natural...

It should be noted that HFW pipe is a type of ERW pipe. High frequency welding (HFW) is a solid resistance heat energy. Through high-frequency current welding resistance, the heat generated in the co...

The first is to know the difference between ERW and HFW welding processes. ERW welding process refers to the heat generated by the resistance of the current flowing through the connecting metal. The...

Straight seam steel pipe is a kind of welded steel pipe. After forming a hot-rolled steel coil by a forming machine, the steel coil is transformed into a cylindrical shape. The high-frequency current ...

The quality of straight seam welded pipe is a concern for users. Its quality is mainly composed of its own material, standard, wall thickness, weld and other factors. Under the same material and stand...

The factors that affect the passivation coating of seamless steel pipes mainly include the following four points: The passive film of seamless steel pipes is a suppressed metastable structure in therm...

Casing pipe drilling refers to the use of casing instead of drill pipe to apply torque and weight on the drill bit to achieve bit rotation and drilling. Drill pipes, drill collars, etc. are no longer ...

API is the abbreviation of American Petroleum Institute. API was established in 1919 and was the first national-level business association in the United States. An important task of API is to be respo...