Optimization of composition and processing to satisfy X-70 linepipe property requirements

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

DOI:https://doi.org/10.1007/BF02835721· OSTI ID:6695740

Abrams, H; Hansen, S S

During the past few years, Bethlehem has produced approximately 300,000 tons of high-strength, large-diameter linepipe at the X-65 and X-70 strength levels for three major pipelines, Pacific Gas Transmission, Northern Border, and Trailblazer. This production experience has been translated into database incorporating chemistry, key processing parameters, and plate and pipe mechanical properties. Statistical techniques have been applied to this database to develop interrelationships between chemistry, processing, and properties. In addition, empirical relationships which characterize the shift in strength and toughness during UOE pipe forming have been established and used to predict pipe properties. An example is described in which the database was used to optimize a four-heat trial to meet an X-70 strength requirement along with a toughness specification of 50 ft-lb minimum impact energy at a design temperature of 32 /sup 0/F. Variable partition analysis was used to quantify the effect of chemistry/processing variations on strength and toughness. The overall plate-to-pipe shift in these properties was also determined, and several pipes were evaluated after varying amounts of hydraulic expansion to define the effects on strength and toughness. Overall, the results of the four-heat trial verified the predictions made from the pipeline database and demonstrated that available relationships can be used to specify steel composition and plate processing to meet various linepipe requirements.

• Research Organization: Bethlehem Steel Corp., Bethlehem, PA
• OSTI ID: 6695740
• Journal Information: J. Mater. Energy Syst.; (United States), Journal Name: J. Mater. Energy Syst.; (United States) Vol. 5:4; ISSN JMSMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360100* -- Metals & Alloys
ALLOYS
CHEMICAL COMPOSITION
DATA BASE MANAGEMENT
FABRICATION
IRON ALLOYS
IRON BASE ALLOYS
MANAGEMENT
MATERIALS TESTING
MATERIALS WORKING
MECHANICAL PROPERTIES
OPTIMIZATION
PIPELINES
PIPES
PLATES
SPECIFICATIONS
STEELS
TECHNOLOGY UTILIZATION
TESTING