Low-alloy steels for thick-walled pressure vessels. Summary report, February 1, 1980-January 31, 1982
This program aimed to modify existing commercial pressure vessel steels to provide strong, tough, creep resistant materials, with low hydrogen attack and temper embrittlement susceptibilities, which can also be field-fabricated into thick-section vessels for coal conversion systems. Emphasis was placed on determining the effects of Mn, Ni and Cr on the creep rupture and hydrogen attack susceptibilities of Cr-Mo steels. Hydrogen attack studies were also carried out on A533B and model alloy systems to investigate the role of alloy carbides in promoting resistance to hydrogen damage. Creep rupture fracture times were determined at 500, 560 and 600/sup 0/C for periods up to 2000 hours. The effects of cooling rate from the austenitizing temperature and tempering response on the microstructure of 3Cr-1Mo-1Mn-1Ni steel were studied. The carbide structures in all the alloy modifications were carefully characterized. Data were collected from preliminary weld bead-on-plate tests of A387 and temper embrittlement studies of A543 with mischmetal addition. The unloading compliance test technique for J/sub Ic/ measurements was completed for A533B specimens but shortage of material prevented testing of A387. The mechanical property, elevated temperature creep and hydrogen attack data suggested that addition of 0.75 Cr + 0.5 Mn + 1Ni was beneficial in reducing susceptibility to hydrogen damage but was detrimental to creep rupture properties. 44 figures, 14 tables.
- Research Organization:
- Oak Ridge National Lab., TN (USA); California Univ., Berkeley (USA). Dept. of Materials Science and Mineral Engineering
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5228749
- Report Number(s):
- DOE/NBM-2018324; ON: DE82018324
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CONTAINERS
CREEP
CRYSTAL STRUCTURE
EMBRITTLEMENT
FAILURES
FRACTURE MECHANICS
FRACTURE PROPERTIES
HEAT TREATMENTS
HYDROGEN EMBRITTLEMENT
IMPACT TESTS
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
MECHANICS
MICROSTRUCTURE
NICKEL ALLOYS
PRESSURE VESSELS
RESEARCH PROGRAMS
RUPTURES
STEEL-ASTM-A533
STEEL-ASTM-A543
STEELS
TEMPERING
TESTING