If the cold treatment method of seamless steel pipe is not correct, it will affect its performance to a certain extent. Therefore, preventive measures must be taken during cold treatment, but most people do not know how to do this. In fact, the main content lies in the following points.
The 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, it can be cold treated in a conventional way. Of course, the second suggestion is to choose a conventional treatment at minus 60 degrees, and then perform deep cooling at minus 120 degrees.
The lower the treatment temperature, the rapid transformation of retained austenite into martensite, but not complete transformation. After experiments, it can be found that there will be about 2% of retained austenite. At this time, the retained austenite needs to be retained to achieve a certain buffering effect.
After the seamless steel pipe is cold treated, it needs to be taken out and put into hot water for heating, which can effectively eliminate about 40% of the cold treatment stress. After gradual heating, it should be tempered and cold treated 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 and is convenient for daily storage.
The 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, it can be cold treated in a conventional way. Of course, the second suggestion is to choose a conventional treatment at minus 60 degrees, and then perform deep cooling at minus 120 degrees.
The lower the treatment temperature, the rapid transformation of retained austenite into martensite, but not complete transformation. After experiments, it can be found that there will be about 2% of retained austenite. At this time, the retained austenite needs to be retained to achieve a certain buffering effect.
After the seamless steel pipe is cold treated, it needs to be taken out and put into hot water for heating, which can effectively eliminate about 40% of the cold treatment stress. After gradual heating, it should be tempered and cold treated 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 and is convenient for daily storage.
