EFFECT OF MOLYBDENUM ADDITION ON SCC SUSCEPTIBILITY OF STAINLESS STEELS IN OXYGENATED HIGH TEMPERATURE WATER.

Abstract

The effect of molybdenum addition on the SCC (stress corrosion cracking) susceptibility of sensitized stainless steel in oxygenated high-temperature water was studied by the creviced bent beam SCC test (CBB test) and the A262E intergranular corrosion test. The molybdenum addition improved the SCC susceptibility of these steels in oxygenated high-temperature water not only by delaying the sensitization at lower temperatures but also by increasing the material resistance to the SCC under a given degree of sensitization. These laboratory test results reveal that the molybdenum addition is quite beneficial to improving the SCC susceptibility of stainless steel pipe weld joints in boiling water reactor environment.