Corrosion performance of modified 13Cr OCTG
- Nippon Steel Corp., Futtsu, Chiba (Japan)
Sour resistant 13% Cr martensitic stainless steel OCTG (Oil Country Tubular Goods) with high CO{sub 2}-corrosion resistance was developed. Additions of Cu and Ni in combination with an addition of Mo resulted in improved corrosion performance. CO{sub 2}-corrosion rates were studied at various chloride ion concentration levels and at various temperatures. Microstructural observation revealed that the corrosion film of the 13% Cr with combined additions of Cu and Ni is amorphous, which is supposed to be the mechanism for the high corrosion resistance. Sulfide stress cracking (SSC) resistance was also studied as functions of pH and H{sub 2}S partial pressure. It was found that SSC occurrence can be predicted by comparing the pitting potential with sulfur reduction potential. Finally the advantages of the newly developed 13% Cr OCTG are presented from the view points of high strength, high temperature and sour applications.
- OSTI ID:
- 268201
- Report Number(s):
- CONF-960389--
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
CARBON DIOXIDE
COPPER
COPPER ADDITIONS
CORROSION PRODUCTS
CORROSION PROTECTION
CORROSION RESISTANCE
CORROSIVE EFFECTS
CRACK PROPAGATION
FIELD PRODUCTION EQUIPMENT
FRACTURE PROPERTIES
HYDROGEN SULFIDES
METALLURGICAL EFFECTS
MICROSTRUCTURE
MOLYBDENUM
NICKEL
NICKEL ADDITIONS
STEEL-CR13
STRESS CORROSION
TENSILE PROPERTIES