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Ferritic/martensitic steels with Cr of 9%-12% (in mass percent) are favourable candidates for fuel cladding tube and in-core components of supercritical water-cooled reactor. 9Cr-3WVTiTaN low activation ferritic/martensitic steel, designated as China Nuclear Steel-Ⅰ (CNS-Ⅰ), was patterned after T91 steel (modified 9Cr-1Mo) for the reactor. The idea of low activation material and microalloy technology was introduced into the design of the steel. The hardening, tempering and transformation behaviour of CNS-Ⅰ steel was investigated. The steel has advantages in tensile properties at elevated temperature relative to zircaloy that has been widely used as cladding material for conventional light water reactors. CNS-Ⅰ steel exhibits tensile properties and impact toughness comparable to T91 steel which exhibits availability in the present fission reactors and fast breeder reactor but includes undesired radioactive elements such as molybdenum and niobium.
Ferritic / martensitic steels with Cr of 9% -12% (in mass percent) are favourable candidates for fuel cladding tube and in-core components of supercritical water-cooled reactor. 9Cr-3WVTiTaN low activation ferritic / martensitic steel, designated as China Nuclear The idea of low activation material and microalloy technology was introduced into the design of the steel. The hardening, tempering and transformation behavior of steel. I (CNS-I), was patterned after T91 steel (modified 9Cr-1Mo) for the reactor. CNS-I steel was investigated. The steel has advantages in tensile properties at elevated temperature relative to zircaloy that has widely been used as cladding material for conventional light water reactors. CNS-I steel exhibits tensile properties and impact toughness comparable to T91 steel which exhibits availability in the present fission reactors and fast breeder reactor but includes undesired radioactive elements such as molybdenum and niobium.