430 stainless steel strip is a very common type of stainless steel, what are its cold treatment methods? C), ice cold treatment (temperature is 0~-80°C), medium cooling treatment (temperature is controlled at -80~-150°C). The temperature and time of cold treatment are briefly described below.
1. The temperature of cold treatment
Cold treatment is to transform austenitic stainless steel into martensite. Generally speaking, cold treatment is carried out at an ideal temperature. The temperature is near the Mf point. The temperature cannot be too high or under the stage. If the volume transformation is small, the effect of cold treatment is not obvious. If the temperature is too low, the investment cost will increase.
Generally speaking, the Mf point of 430 stainless steel strip will not be lower than -100°C, but considering the processing performance, equipment, process and simplicity of operation, the temperature of cold treatment will be controlled at -30~-80°C, which is ice cold. deal with. Under some special conditions, even lower cold processing temperatures can be adopted. The temperature of the specific cold treatment is not fixed and can be adjusted flexibly.
2. Insulation time.
In the process of cold treatment, the holding time is related to the processing method and quantity of 430 stainless steel strip. If it is batch processing, the holding time should be 0.5~2h. In addition, whether there is direct contact between the stainless steel belt and the refrigerant will also affect the holding time. If there is no direct contact, the holding time will be extended by about half an hour.
430 stainless steel strip can achieve many purposes through cold treatment, not only to change the austenite structure, but also to improve the hardness, aging resistance and ferromagnetism of the steel, and to make the size of the material more stable and reduce its occurrence. Probability of deformation.