Heat treatment of 2 1/4 Cr--1 Mo steel for breeder reactor steam generators

Journal Article · Thu Apr 01 04:00:00 EST 1982 · Nucl. Technol.; (United States)

OSTI ID:6885016

Klueh, R L

Commercially, 2 1/4 Cr--1 Mo steel is used in various heat-treated conditions. Present designs for breeder reactor steam generators call for the steel to be used in an annealed or isothermally annealed condition. Future reactor steam generators may offer an incentive to use a normalized-and-tempered steel. The elevated-temperature mechanical property differences between the normalized-and-tempered and annealed or isothermally annealed conditions were assessed to determine the advisability of using the normalized-and-tempered material for breeder reactor steam generators. The mechanical properties of 2 1/4 Cr--1 Mo steel are determined by the microstructure, which can be different for annealed and normalized-and-tempered steel. The extreme in microstructural difference is when the normalized-and-tempered steel is entirely bainite and the annealed steel is 75 to 80% proeutectoid ferrite, the balance bainite. Mechanical property data for annealed and normalized-and-tempered 2 1/4 Cr--1 Mo steel with these microstructures were compared. The results were analyzed in terms of the kinetics of the different metallurgical changes that the various microstructures undergo during an elevated-temperature test or elevated-temperature exposure during service. It was concluded that 2 1/4 Cr--1 Mo steel could be used in all heat treatments that are presently used in commercial practice.

• Research Organization: Oak Ridge National Laboratory Metals and Ceramics Division, P.O. Box X Oak Ridge, Tennessee 37830
• OSTI ID: 6885016
• Journal Information: Nucl. Technol.; (United States), Journal Name: Nucl. Technol.; (United States) Vol. 57:1; ISSN NUTYB
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
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Breeding
36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
ALLOYS
BAINITE
BOILERS
BREEDER REACTORS
CARBON ADDITIONS
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CRYSTAL STRUCTURE
EPITHERMAL REACTORS
EUTECTOIDS
FAST REACTORS
FBR TYPE REACTORS
FERRITE
HEAT TREATMENTS
IRON ALLOYS
IRON BASE ALLOYS
ISOTHERMAL PROCESSES
KINETICS
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MICROSTRUCTURE
QUANTITY RATIO
REACTION KINETICS
REACTOR MATERIALS
REACTORS
STEAM GENERATORS
STEELS
TEMPERATURE EFFECTS
TESTING
VAPOR GENERATORS