Development of high strength SSC-resistant low alloy steel for OCTG
- NKK Keihin Research Department, Kawasaki (Japan)
Effects of H{sub 2}S concentration and temperature on sulfide stress cracking (SSC) of fine grained 110 ksi (758MPa) grade steel for OCTG compared with API L-80 and C-90 were examined in the NACE solution by means of slow strain rate technique (SSRT) test. The susceptibility to SSC increases with increasing H{sub 2}S concentration and typical features of cleavage fracture are observed by hydrogen embrittlement. The fine grained 110 ksi (758MPa) grade steel shows the best resistance to SSC in terms of ultimate tensile stress (UTS), and intergranular cracking of this steel is not observed. The 110 ksi (758MPa) grade steel shows maximum susceptibility to SSC at 65 C in the NACE solution saturated with 100% H{sub 2}S. The SSRT test is considered to be suited for evaluating hydrogen embrittlement because the elongation primarily reflects the degree of the embrittlement. In this study, however, the differences of resistance to SSC among the fine grained 110 ksi (758MPa) grade steel, L-80 and C-90 are not obvious in terms of elongation ratio.
- OSTI ID:
- 70064
- Report Number(s):
- CONF-940222--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effects of environmental conditions on SSC resistance of C125 OCTG
Effect of the water/oil ratio on the SSCC susceptibility of high strength OCTG carbon steel
Related Subjects
36 MATERIALS SCIENCE
CARBON STEELS
CHEMICAL COMPOSITION
CONCENTRATION RATIO
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
CRACK PROPAGATION
EXPERIMENTAL DATA
HYDROGEN EMBRITTLEMENT
HYDROGEN SULFIDES
LOW ALLOY STEELS
MECHANICAL TESTS
OIL WELLS
SCANNING ELECTRON MICROSCOPY
STRESS CORROSION
TEMPERATURE DEPENDENCE
ULTIMATE STRENGTH