Microstructures and properties of controlled rolled and accelerated cooled molybdenum-containing line pipe steels

Journal Article · Thu Mar 01 04:00:00 EST 1984 · J. Mater. Energy Syst.; (United States)

DOI:https://doi.org/10.1007/BF02835722· OSTI ID:7057977

Coldren, A P; Oakwood, T G; Tither, G

Modern plate production techniques involving controlled rolling below the Ar/sub 3/ temperature and, more recently, the development of equipment for interrupted accelerated cooling after rolling have made it possible to simultaneously reduce the alloy content of line pipe steels, while maintaining their strength-toughness balance. Several investigations have been conducted at the Climax Laboratory for the purpose of using these processing methods to develop cost-effective steels with strengths sufficient for X-70 to X-80 Arctic-grade line pipe. Arctic grade X-70 line pipe properties were achieved by intercritical rolling and air cooling a 0.08 pct C-1.5 pct Mn-0.15 pct Mo-0.04 pct Nb steel. X-80 strength was obtained in steels containing 0.08 pct C-1.65 pct Mn-0.3 pct Mo-0.055 pct Nb, and 0.08 pct V. The microstructures consisted of mixtures of polygonal and acicular ferrite, martensite-austenite (M-A), and various ferritecementite aggregates that could be classified as pearlite or upper bainite. Strength increased as finish rolling temperature decreased and as total percent reduction below the Ar/sub 3/ temperature increased.

• Research Organization: Climax Molybdenum Co. of Michigan a Division of AMAX of Michigan Inc., Ann Arbor, MI
• OSTI ID: 7057977
• Journal Information: J. Mater. Energy Syst.; (United States), Journal Name: J. Mater. Energy Syst.; (United States) Journal Issue: 4 Vol. 5:4; ISSN JMSMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
ALLOYS
BENCH-SCALE EXPERIMENTS
CHEMICAL COMPOSITION
COOLING
CRYSTAL STRUCTURE
ELEMENTS
FABRICATION
HEAT TREATMENTS
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE
MATERIALS WORKING
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
MOLYBDENUM
NIOBIUM
PIPELINES
PIPES
PLATES
ROLLING
SPECIFICATIONS
STEELS
TEMPERATURE EFFECTS
THERMOMECHANICAL TREATMENTS
TRANSITION ELEMENTS
VANADIUM