The corrosion of duplex stainless steels in sour service

Book · Fri Dec 30 23:00:00 EST 1994

OSTI ID:70056

Francis, R; Byrne, G ^[1]

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1. Weir Materials Ltd., Manchester (United Kingdom). Park Works

The high resistance to corrosion of 22 Cr, 25 Cr and super duplex stainless steels in chloride containing environments is well known. In sour service, resistance to stress corrosion cracking, pitting and crevice corrosion in the presence of CO{sub 2} and H{sub 2}S is required. This paper presents the results of tests to determine the resistance of three duplex stainless steels to stress corrosion cracking, pitting and crevice corrosion at elevated temperature in a synthetic brine containing different concentrations of H{sub 2}S. The three alloys were UNS S31803, UNS S32550 (low Cu) and UNS S32760. All three materials were tested in the cold worked condition, and loaded to about the 0.2% proof stress. The tests were conducted with 93 bar (9.3 MPa) CO{sub 2} and either 0.125, 0.25 or 0.375 bar (12.5, 25 or 37.5 KPa) H{sub 2}S. The results showed that only the super duplex alloy, UNS S32760, was resistant to SCC at 80 C at all of the H{sub 2}S concentrations. Pitting and crevice corrosion occurred at 121 C only at the highest H{sub 2}S concentration on all the alloys. The depth and severity of attack varied from alloy to alloy and indicated that super duplex UNS S32760 is more resistant than 25Cr, UNS S32550 (low Cu), which is more resistant than 22Cr UNS S31803.

• OSTI ID: 70056
• Report Number(s): CONF-940222--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
36 MATERIALS SCIENCE
CARBON DIOXIDE
CHEMICAL COMPOSITION
CHROMIUM-NICKEL-MOLYBDENUM STEELS
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
CRACK PROPAGATION
CREVICE CORROSION
ELONGATION
EXPERIMENTAL DATA
HARDNESS
HYDROGEN SULFIDES
NATURAL GAS WELLS
OIL WELLS
PITTING CORROSION
STRESS CORROSION
ULTIMATE STRENGTH