How to do a good job of cold treatment for seamless steel pipes?
If the selected cold treatment method for seamless steel pipes is not correct, its performance will be affected to a certain extent. Therefore, comprehensive preventive measures must be taken during the cold treatment process. However, most people do not understand how to do these things well. In fact, the main content lies in the following points.
Before cold treatment, seamless steel pipes should first be boiled in boiling water for 30 seconds, which can effectively eliminate about 15% of internal stress and achieve a stable effect of residual austenite. The next step is to perform cold treatment in a conventional manner. Of course, the first step is to choose a conventional treatment at minus 60 degrees Celsius, followed by a deep cooling at minus 120 degrees Celsius. The lower the treatment temperature, the better, It will cause the residual austenite inside to rapidly transform into martensite, but it is impossible to completely transform. After experiments, it can be found that there will be about 2% residual austenite. Therefore, it is necessary to retain the residual austenite to achieve a certain buffering effect.
After the seamless steel pipe is cold treated, it also needs to be taken out and placed in hot water for heating treatment, which can effectively eliminate about 40% of the cold treatment stress. After gradually heating up, it should also be tempered and cold treated as soon as possible, most of which can be eliminated as soon as possible, and cracks can be avoided to obtain stable performance, ensuring that the product does not deform during later use, It is also convenient for daily storage and has many advantages overall. These are actually some preventive measures for its cold treatment. If you can do it well, it will not have any impact.
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