Cold treatment method of ms seamless steel pipe

If the cold treatment method of the ms seamless steel pipe is not correct, its performance will be affected to a certain extent. Therefore, precautions must be taken when cold processing, but most people do not know how to do this. In fact, the main content lies in the following points.

The ms seamless steel pipe should be boiled in boiling water for 30 seconds before cold treatment, which can effectively eliminate about 15% of the internal stress, and the retained austenite can achieve a stable effect. Then, cold treatment can be carried out in a conventional manner. Of course, the second suggestion is to choose a regular treatment of minus 60 degrees, and then go deep cold at minus 120 degrees.

The lower the treatment temperature, the faster the retained austenite will be transformed into martensite, but not completely. Through experiments, it can be found that there will be about 2% retained austenite. At this time, it is necessary to retain retained austenite to achieve a certain buffering effect.

After cold treatment, the mild steel seamless steel pipe needs to be taken out and heated in hot water, which can effectively eliminate about 40% of the cold treatment stress. After gradual heating, tempering and cold treatment should be carried out as soon as possible, most of which can be eliminated as soon as possible to avoid cracks and obtain stability. The performance of the product ensures that the product will not be deformed in the later use process, which is convenient for daily storage.