What changes will happen to 304 stainless steel pipes in a low temperature environment?
What changes will happen to 304 stainless steel pipes in a low temperature environment?

1.Low temperature embrittlement of 304 stainless steel pipe 1. In a low temperature environment, the deformation energy is small. In a low temperature environment, the phenomenon that the elongation rate and the reduction rate of the section decrease are called low temperature embrittlement. It mostly occurs on the body-centered cubic structure of the ferrite series.

2.Low-temperature processing of stainless steel pipes: The martensitic stainless steel is quenched from austenitizing temperature and then cooled to a very low temperature to promote the quenching method of martensite. It is suitable to produce stainless steel with retained austenite.

304 stainless steel pipe has great changes in electrical resistance, linear expansion coefficient, thermal conductivity, mass melting and magnetism at low temperatures. Resistance and linear expansion coefficient decrease at low temperature; thermal conductivity and mass heat capacity decrease sharply at low temperature; Young's modulus (longitudinal elastic modulus) increases together when the temperature drops. Because the austenitic series stainless steel pipe has a low temperature (Subzro temperature) Ms point (martensite abnormal start temperature or martensite formation temperature), when it is kept below the Ms point, Vonite can be formed. Martensite at low temperature

The formation of SUS304 (18Cr-8Ni), the representative steel of the austenitic series of stainless steel, has right and wrong magnetic properties at room temperature, but becomes magnetic in low temperature environments.

Regarding the low-temperature brittleness of ferritic stainless steel pipes like carbon steel, in the low-temperature state, austenitic steel does not exist. Therefore, ferritic or martensitic stainless steel develops low-temperature embrittlement while austenitic stainless steel or nickel-based alloy does not develop low-temperature embrittlement. Ferrite is not

Rusty steel pipes such as SUS410 (13Cr) and SUS430 (18Cn) show a sharp drop in impact value at low temperature. Therefore, when using at low temperature, it is necessary to pay special attention to improving the impact toughness of ferritic stainless steel. A high-purification process can be considered. With the help of controlling the C and N level, when the embrittlement temperature is improved in the range of -50°C to -100°C, it may be used in freezing-related engineering. In recent years, it has been used SUS430L (18C-T, Nb-LC and SUS436L (18C- Mo-TiNb-LC)

It is applied to the shell of refrigeration appliance. Ferritic stainless steel has a body-centered cubic structure. When the function of the material becomes weak, the sharp cracks will rapidly expand to form brittle damage. The austenitic series stainless steel has a face-centered cubic structure without brittle damage. Aoshu's investment in stainless steel SUS304L (18Cr-9Ni-LC) and SUS316L (18Cr-12Ni2Mo-LC, etc.) have shown excellent impact characteristics at low temperatures. However, pay attention to the separation of ferrite or martensitic caused by processing. The separation of the body, but also

There is a tendency for embrittlement caused by separation of carbides or o phases due to sensitization.

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