High-purity steels for utility components: Final report
Four structural steels commonly used for utility components like rotor forgings and pressure vessels have been evaluated in high-purity form with levels of manganese and silicon ranging from zero to conventional levels. When manganese is absent from the high-purity steels, it is found to be desirable to compensate for decreased hardenability by increasing the remaining alloy content. The main benefits of improved purity and low Mn and Si content have been found to be increased fracture toughness, reduced fracture appearance transition temperature (FATT), and improved resistance to temper embrittlement. Some improvement in creep rupture ductility was found to be associated with low Si and Mn contents. Reduced volume fraction of inclusions, mainly sulfides and silicates associated with manganese and silicon, are responsible for the observed improved toughness and ductility characteristics. Transformation (CCT curves), cleanliness, tensile, FATT, creep rupture, and fatigue characteristics were observed on the steels studied. 68 refs., 173 figs., 82 tabs.
- Research Organization:
- Japan Steel Works Ltd., Muroran, Hokkaido; Bethlehem Steel Corp., PA (USA); Electric Power Research Inst., Palo Alto, CA (USA)
- OSTI ID:
- 5980016
- Report Number(s):
- EPRI-NP-5399; ON: TI88920035
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHROMIUM-MOLYBDENUM STEELS
FRACTURE MECHANICS
HEAT TREATMENTS
MECHANICAL PROPERTIES
CHROMIUM-NICKEL STEELS
STEEL-ASTM-A508
CHARPY TEST
CREEP
EMBRITTLEMENT
FORGING
HARDNESS
IMPURITIES
MANGANESE
MICROSTRUCTURE
PRESSURE VESSELS
ROTORS
SILICON
THERMAL FATIGUE
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CONTAINERS
CRYSTAL STRUCTURE
DESTRUCTIVE TESTING
ELEMENTS
FABRICATION
FATIGUE
IMPACT TESTS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MATERIALS WORKING
MECHANICAL TESTS
MECHANICS
METALS
NICKEL ALLOYS
SEMIMETALS
STEELS
TESTING
TRANSITION ELEMENTS
360101* - Metals & Alloys- Preparation & Fabrication
360103 - Metals & Alloys- Mechanical Properties