Corrosion resistance of weldable super 13Cr stainless steel in H{sub 2}S containing CO{sub 2} environments
- Sumitomo Metal Industries, Ltd., Amagasaki (Japan). Iron and Steel Research Labs.
- Sumitomo Metal Industries, Ltd., Osaka (Japan)
- Wakayama Steel Works (Japan)
The weldable super 13Cr stainless steel was investigated because of the application for flow line in CO{sub 2} environments with a little amount of H{sub 2}S. TIG welding in the condition of no post weld heat treatment (PWHT) was used as the welding technique. The lowering of C content less than 0.01 mass% in the weldable steel decreased a maximum hardness in the heat-affected zone(HAZ) and mitigated the sulfide stress cracking (SSC) susceptibility. The increasing of Mo content from 2.0 mass% of the super 13Cr stainless steel OCTG (0.02C-12Cr-5.5Ni-2Mo) to 2.5 mass% improved SSC resistance in the HAZ. Based on these results, the weldable super 13Cr stainless steel, which consisted of 0.007C-12Cr-6Ni-2.5Mo-Ti, has been developed. The welded-joint with the yield strength of 550 MPa (80 ksi) and enough corrosion resistance was completed by using the welding material of super duplex stainless steel which had 25Cr-9Ni-3Mo-2W-0.3N. The corrosion resistance to SSC at room temperatures and localized-corrosion at elevated temperatures of the welded-joint was the same as the super 13Cr stainless steel OCTG. The improvement effect of the corrosion resistance by means of Mo addition was discussed based on the stability of Cr oxide passive film, the analysis results of the surface film formed in the CO{sub 2} environment containing H{sub 2}S, and calculated-solubility of oxides, FeCO{sub 3} and sulfides in that environment. It was clarified that Mo assisted the formation of the Cr oxide passive film in the inner layer of the surface film and the formation of Mo sulfide in the outer layer.
- OSTI ID:
- 268198
- Report Number(s):
- CONF-960389-; TRN: IM9634%%270
- Resource Relation:
- Conference: National Association of Corrosion Engineers (NACE) annual corrosion conference and exposition: water and waste water industries, Denver, CO (United States), 24-29 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of Corrosion/96 conference papers; PB: [6615] p.
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
03 NATURAL GAS
STEEL-CR13
CORROSION RESISTANCE
FIELD PRODUCTION EQUIPMENT
CORROSION RESISTANT ALLOYS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
CARBON DIOXIDE
HYDROGEN SULFIDES
CORROSIVE EFFECTS
WELDED JOINTS
MOLYBDENUM
METALLURGICAL EFFECTS
STRESS CORROSION
CRACK PROPAGATION
PROTECTIVE COATINGS
IRON CARBONATES
IRON SULFIDES
VICKERS HARDNESS
WELDING
EXPERIMENTAL DATA