New series of advanced 3Cr-Mo-Ni steels for thick section pressure vessels in high temperature and pressure hydrogen service. Topical report, February 1, 1982-January 31, 1984

Technical Report · Sat Sep 01 04:00:00 EDT 1984

OSTI ID:5995543

Ritchie, R O; Parker, E R; Spencer, P N; Todd, J A

A new series of 3Cr-Mo-Ni steels has been developed for use in thick section pressure vessels, specifically for coal conversion (high temperature and high pressure hydrogen) service. The new steels rely on minor alloy modifications to commercial 2-1/4Cr-1Mo (ASTM A387 Grade 22 Class 2) steel. Based on evaluations in relatively small heats (55 kg), the experimental alloys, which employ additions of Cr, Ni, Mo and V, with Mn at 0.5 wt% and C at 0.15 wt%, display improved properties compared to commercial steels. Specifically, they show significantly improved hardenability (i.e., fully bainitic microstructures following normalizing of 400 mm (16 inch) plates), enhanced strength (i.e., yield strengths exceeding 600 MPa), far superior hydrogen attack resistance and better Charpy V-notch impact toughness, with comparable tensile ductility, creep rupture resistance and temper embrittlement resistance. The microstructural features contributing to these improved mechanical properties are briefly discussed. 39 references, 22 figures, 5 tables.

• Research Organization: California Univ., Berkeley (USA). Dept. of Materials Science and Mineral Engineering
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5995543
• Report Number(s): DOE/OR/21400-T85; UCB/RP-84/D1020; ON: DE85005327
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHEMICAL COMPOSITION
CHROMIUM ADDITIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
COAL GASIFICATION PLANTS
COAL LIQUEFACTION PLANTS
CONTAINERS
CREEP
CRYSTAL STRUCTURE
DATA
ELECTRON MICROSCOPY
ELEMENTS
EMBRITTLEMENT
EXPERIMENTAL DATA
HYDROGEN EMBRITTLEMENT
IMPACT STRENGTH
INDUSTRIAL PLANTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
METALS
MICROSCOPY
MICROSTRUCTURE
MODIFICATIONS
MOLYBDENUM
NICKEL
NUMERICAL DATA
PRESSURE VESSELS
SCANNING ELECTRON MICROSCOPY
STEELS
TENSILE PROPERTIES
TESTING
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY
VANADIUM
YIELD STRENGTH