Prediction of SCC susceptibility based on mechanical properties of line pipe steels: Topical report

Technical Report · Tue Nov 15 04:00:00 EST 1988

OSTI ID:6003671

Christman, T K

In this research program three line pipe steels, removed from long-term service, were examined to determine if there is a correlation between their mechanical properties and stress-corrosion cracking resistance. The hypothesis was that the steel with the greatest tendency for strain hardening, under cyclic and monotonic stress conditions would also have the highest threshold stress for stress-corrosion crack initiation. This hypothesis was verified by the laboratory experiments, which showed the steel with the greatest tendency for strain hardening to have the highest resistance to stress-corrosion. Two other steels, with distinctly lower resistance to plastic deformation, had lower threshold stresses for stress-corrosion. This observation is consistent with the present concept of stress-corrosion crack growth, which holds that crack tip dissolution, and hence crack propagation, occurs because localized plastic deformation ruptures passive films or prevents film formation resulting in crack growth. 2 refs., 9 figs., 2 tabs.

• Research Organization: American Gas Association, Inc., Arlington, VA; Battelle Columbus Div., OH (USA)
• OSTI ID: 6003671
• Report Number(s): AGA-9011369; NG-18/180
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALKALI METAL COMPOUNDS
ALLOYS
CARBON COMPOUNDS
CARBONATES
CHEMICAL REACTIONS
CORRELATIONS
CORROSION
CRACK PROPAGATION
DEFORMATION
DOCUMENT TYPES
HARDENING
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
OXYGEN COMPOUNDS
PIPELINES
PROGRESS REPORT
SODIUM CARBONATES
SODIUM COMPOUNDS
STEELS
STRAIN HARDENING
STRESS CORROSION
TENSILE PROPERTIES