Evaluation of SSC resistance on super 13Cr stainless steel in sour applications
- Sumitomo Metal Industries, Ltd., Amagasaki (Japan). Iron and Steel Research Labs.
- Sumitomo Metal Industries, Ltd., Wakayama (Japan). Wakayama Steel Works
The super 13Cr martensitic stainless steel consists of low C content below 0.03mass%, 13mass% Cr 5.5mass% Ni and 2mass% Mo and has good resistance of both sulfide stress cracking(SSC) at room temperature and localized corrosion at elevated temperatures compared with conventional 13Cr steel(AISI 420). The buffer solution containing CH{sub 3}COONa-CH{sub 3}COOH with high buffer power has been developed in order to carry out a more exact experiment under a constant pH between 3.0 and 5.5 The effect of H{sub 2}S partial pressure and pH on SSC resistance of the super 13Cr stainless steel was evaluated in the newly developed buffer solution by constant strain method, slow strain rate technique(SSRT) and the cyclic SSRT in which the tensile and compression tests were repeated 15 times at the strain rate of 4 {times} 10{sup {minus}6} s{sup {minus}1} between 0.95 and 0.60 {times} yield strength. The SSC resistance was characterized and quantified by means of correlating H{sub 2}S partial pressure and solution pH. SSRT gave the most severe evaluation for the SSC resistance of all the methods tested because SCC susceptibility in SSRT was evaluated under the plastic deformation condition up to failure. The constant strain tests which are 4 point bent beam test with notch and NACE tensile test according to NACE TM0177-90, and the cyclic SSRT showed almost the same evaluation result. Therefore, the cyclic SSRT was recommended as a very effective quick evaluation method for the SSC resistance of the super 13Cr stainless steel.
- OSTI ID:
- 106093
- Report Number(s):
- CONF-950304--
- Country of Publication:
- United States
- Language:
- English
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