Investigation of 26-year-old hydroprocessing reactors

Journal Article · Fri Jul 01 00:00:00 EDT 1994 · Materials Performance; (United States)

OSTI ID:7052148

Bagdasarian, A J; Bereczky, E L ^[1]; Ishiguro, T; Ishizuka, T; Tahara, T ^[2]

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1. Unocal Corp., Brea, CA (United States)
2. Japan Steel Works Ltd., Hokkaido (Japan)

Six 26-year-old reactors made of 2-1/4% chromium-1% molybdenum steel with double-layer stainless weld overlay were examined for material property damage and to evaluate defects. Crack-like flaws in the weld deposits were found to increase in size by hydrogen-assisted crack growth. The weld overlay cracks were caused by hot cracking during fabrication because of insufficient ferrite phase. All the weld overlay cracks stopped at the interface between the weld overlay and base metal. Reduced low-temperature toughness values obtained in Charpy impact testing were observed only in the weld deposit metal with full bainitic structure. The lower susceptibility to temper embrittlement of the base plate is attributed to the annealed structure.

• OSTI ID: 7052148
• Journal Information: Materials Performance; (United States), Journal Name: Materials Performance; (United States) Vol. 33:7; ISSN MTPFBI; ISSN 0094-1492
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
42 ENGINEERING
420500 -- Engineering-- Materials Testing
ALLOYS
AUSTENITIC STEELS
CHARPY TEST
CHEMICAL REACTORS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CRACK PROPAGATION
DESTRUCTIVE TESTING
EMBRITTLEMENT
FAILURE MODE ANALYSIS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
HYDROGEN EMBRITTLEMENT
IMPACT TESTS
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
LIFETIME
MATERIALS
MATERIALS TESTING
MECHANICAL TESTS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
SERVICE LIFE
STAINLESS STEEL-308
STAINLESS STEEL-310
STAINLESS STEELS
STEEL-CR20NI11
STEEL-CR25NI20
STEELS
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
TESTING
WELDED JOINTS