The spiral tube is prone to cracks in thermal treatment cooling. What are the aspects of attention during the production process to avoid cracks?
1. After quenching, you should recover in time. Many spiral steel pipes are not produced during the quenching and cooling process, but after being taken out of the quenching medium, it appears after a period of time, the so -called timeliness crack. This is due to a large quenching stress. If the fire treatment is performed immediately after quenching, it can effectively prevent the occurrence of timely cracks.
2. The self -ignition should be used to use the quenching waste heat for the cracks.
3. Use lower quenching temperature and short insulation time. For high -alloy steel, considering that there are many alloy elements, their spiral steel pipes have poor thermal conductivity, so they should be fully heated (one or many times).
4. For parts that are easy to quench (such as threaded holes, edges, grooves, etc.), you must use stone cotton ropes to plug or wrap it with iron. Causes the spiral steel pipe.
5. Choose a medium that is slowly cooling and use oil -cooled spiral steel pipes to avoid cold in the water; master the time when the cooling medium is used to cool to the spiral steel pipe near the spiral steel pipe; , Actuary or nitrate saline solution can be used as a cooling medium, which can make complex shapes from the risk of quenching cracks.
