Abstract
This study is to explore a better cryogenic treatment to improve the corrosion resistance of 304LN steel with welds. The cryogenic treatment was carried out at a temperature ranging from 14 °C to −196 °C. The test piece was cooled by 2 °C · min−1, 5 °C · min−1 and direct liquid nitrogen soaking. During the test, the microstructure changes of the various parts of the piece (including the base metal, the heat affected zone and the weld zone) after cryogenic treatment and low temperature tempering were observed by optical microscopy and scanning electron microscopy. The cryogenic treated specimens were transferred to the laboratory for hardness, impact and corrosion tests. The results of experiments showed that cryogenic treatment can improve the corrosion resistance of the steel, especially for the reinforcement of the base metal. The effect of separate cryogenic treatment on mechanical properties is not obvious. It is recommended that the actual cryogenic treatment process be carried out at a temperature of 5 degrees Celsius per minute.
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