Comparative evaluations of the weldability of modified 800H and other advanced austenitic stainless steels
- Univ. of Tennessee, Knoxville, TN (United States)
The weldability of modified 800H was evaluated in terms of HAZ hot cracking susceptibility and HAZ softening tendency. Four other types of austenitic alloys, modified 316, 310Ta, HR3C and NF709, were employed to carry out a comparative study. It was found that modified 800H exhibits good weldability in terms of operability as contrasted to NF709. However, a higher HAZ hot cracking susceptibility for the modified 800H tubing heats was revealed as compared to the commercial tubing heats of HR3C and NF709. The hot cracking test results for the small laboratory prepared modified 800H heats showed an equivalent or better HAZ hot cracking resistance as compared to HR3C and NF709. Thus, it is anticipated that modified 800H tubing can show a hot cracking resistance equivalent to NF709 and HR3C if the base metal grain size is properly controlled and an optimum thermal mechanical treatment has been performed. The preliminary assessment on HAZ softening behavior for modified 800H, modified 316, 310Ta, HR3C and NF709 alloys is discussed.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- OSTI ID:
- 140141
- Report Number(s):
- ORNL/FMP--93/1; CONF-9305135--; ON: DE94001091
- Country of Publication:
- United States
- Language:
- English
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