Development of sour resistant modified 13Cr OCTG
- Nippon Steel Corp., Futtsu, Chiba (Japan). Steel Research Lab.
- Nippon Steel Corp., Tobata, Kitakyushu (Japan). Yawata R and D Lab.
Sour resistant 13% Cr martensitic OCTG (Oil Country Tubular Goods) with so far unexpected high CO{sub 2} corrosion resistance was developed. CO{sub 2} corrosion resistance was remarkably increased by complex additions of Cu and Ni, of which contribution to CO{sub 2} corrosion resistance corresponds to that by a further addition of 6% Cr at 180 C. SSC resistance was improved by an addition of Mo. Based on such knowledge of roles of chemical elements on corrosion properties and phase stability, 0.02%C-12.5%Cr-4.5%Ni-1.5%Mo-1.5%Cu steel was developed. This steel has good hot-workability and was produced into seamless OCTG. Corrosion rates in a high pressure CO{sub 2} environment were less than 0.1 mm/y at temperatures up to 200 C (392 F) compared with 100 C of conventional API L80-13CR. No SSC occurred in sour environments with partial pressure of 0.001MPA or less even at low pH of 3.5. At elevated temperatures no cracking and no pitting was observed in H{sub 2}S containing CO{sub 2}-brine environments. The properties of the developed steel are much better in CO{sub 2} corrosion and SSC resistance compared with those of conventional 13Cr steel and are close to those of duplex stainless steel.
- OSTI ID:
- 106092
- Report Number(s):
- CONF-950304--
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
CARBON DIOXIDE
CHROMIUM STEELS
COPPER
COPPER ADDITIONS
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
CRACK PROPAGATION
EXPERIMENTAL DATA
FIELD PRODUCTION EQUIPMENT
HYDROGEN SULFIDES
METALLURGICAL EFFECTS
MICROSTRUCTURE
MOLYBDENUM
MOLYBDENUM ADDITIONS
NICKEL
NICKEL ADDITIONS
STRESS CORROSION