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The purpose of preheating the pipe before welding the spiral steel pipe
Important components of alloy steel and thick parts must be preheated before welding. The purpose of preheating before welding is as follows: (1) Preheating can slow down the cooling rate after welding so that hydrogen diffuses in the weld metal and escapes to avoid cracking caused by hydrogen. I...Read more -
What are the quality requirements for steel pipeline pickling
(1) After pickling, the rust and oil on the inner wall of the steel pipe are completely removed, and the cleanliness should meet the requirements of relevant standards. (2) Pickling parts shall not be over-pickled. If the steel pipe is soaked in the pickling solution for too long, the surface of ...Read more -
The difference between hot-rolled seamless steel pipe and cold-rolled seamless steel pipe
In terms of processing technology: hot rolling is hot working, and cold drawing is cold working. Hot rolling is rolling above the recrystallization temperature, and cold rolling is rolling below the recrystallization temperature; Distinguish from appearance: cold-rolled seamless steel pipe has a ...Read more -
Analysis of Influencing Factors of High-Frequency Longitudinal Welded Pipe Technology
The main process parameters of high-frequency straight seam welded pipe include welding heat input, welding pressure, welding speed, opening angle, the position and size of the induction coil, the position of the impedance, and so on. These parameters have a great impact on improving the product ...Read more -
Routine maintenance and details are required when thick-walled steel pipes are used
Routine maintenance is required when thick-walled steel pipes are used: Thick-walled steel pipes are widely used steel varieties. It directly affects the economic benefits and the lives of people. All countries in the world attach great importance to the detection of thick-walled steel pipes, and...Read more -
Classification of the quality of large-diameter longitudinally welded steel pipes
The application of large-diameter longitudinally welded steel pipes has become very common in people’s lives, so do you know what grades the quality of large-diameter longitudinally welded steel pipes can be divided into? The following will introduce the specific content to you. Generally, ...Read more