1. Low temperature embrittlement of stainless steel pipe

In low temperature environment, the deformation energy is small. In low temperature environment, the elongation and the decrease of the shrinkage of the section are called low temperature embrittlement. And more in the ferrite series of body-centered cubic tissue.

2. Low temperature processing of stainless steel pipe

The martensitic stainless steel is quenched from austenitizing temperature and then cooled to a very low temperature to promote the martensite quenching method. Suitable for easy production of residual austenitic stainless steel.

Stainless steel pipe at low temperatures, resistance, linear expansion coefficient, thermal conductivity, mass hot melt and magnetic will change greatly. Resistance, linear expansion coefficient at low temperature becomes smaller; thermal conductivity, mass heat capacity at a low temperature drastically reduced.

On the low temperature state, the ferrite stainless steel pipe exists like carbon steel as low temperature brittleness, while the austenitic steel is not present. So ferritic or martensitic stainless steel produces low temperature embrittlement and austenitic stainless steel or nickel based alloys do not show low temperature brittleness. Ferritic stainless steel tube SUS410, SUS430 and so on in the low temperature state, showing a sharp decline in the impact value. Therefore, when used in a low temperature, it is necessary to pay special attention. As a method for improving the impact toughness of ferrite series stainless steel, a high purification process can be considered. By controlling the C and N levels, the brittle temperature is improved in the range of -50 ° C to -100 ° C, and it is possible to use it for refrigeration-related engineering