New test specimen and methodology for evaluation of steels for resistance to SOHIC

Book · Fri Aug 01 04:00:00 EDT 1997

OSTI ID:504766

Kane, R D; Cayard, M S; Tebbal, S ^[1]; Prager, M ^[2]

---

1. CLI International, Inc., Houston, TX (United States)
2. Materials Properties Council, Inc., New York, NY (United States)

This paper presents a test method for the evaluation of carbon steels for resistance to stress oriented hydrogen induced cracking (SOHIC). It involves the extension of standard non-stressed HIC tests per NACE TM0284 to incorporate the following aspects critical for the evaluation of steels for wet H{sub 2}S equipment: (1) application of tensile stress, (2) full immersion and one-side exposure, (3) evaluation of welded and non-welded specimens, and (4) crack location coding. A double beam (DB) test specimen adapted from ASTM G-39 loaded in 4-point bending is utilized to provide an applied stress. In addition to conventional analyses for internal cracking per NACE TM0284, analysis were developed for (1) crack location coding relative to weld, HAZ and base metal locations and for position of cracks relative to tension surface or centerline locations, and for (2) a simplified SOHIC evaluation procedure involving the measurement of SOHIC crack extension in a notch, non-welded specimen. Data is presented which highlights these particular aspects of the DB test specimen relative to other standard test specimens per NACE TM0177 and TM0284 and for a round robin testing program using the DB specimen.

• OSTI ID: 504766
• Report Number(s): CONF-970332--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON STEELS
CRACK PROPAGATION
EXPERIMENTAL DATA
HYDROGEN EMBRITTLEMENT
HYDROGEN SULFIDES
INTERLABORATORY COMPARISONS
MECHANICAL TESTS
PETROLEUM REFINERIES
PRESSURE VESSELS
STRESS CORROSION
WELDED JOINTS