MECHANICAL PROPERTIES OF 16-8-2 LARGE-DIAMETER PIPE GIRTH WELDS
- Oak Ridge National Laboratory (ORNL)
The 16-8-2 weld filler metal is used to weld type 316 stainless steel. The elevated-temperature mechanical properties of 16-8-2 weld metal specimens taken from girth welds that were made by the automatic gas tungsten-arc process on 0.71-m-diam type 316 stainless steel were determined. For comparison the properties of the type 316 stainless steel pipe were also determined at three pipe positions relative to the weld: at a position adjacent to the weld (the heat-affected zone), at a position of maximum residual stress caused by welding, and at a large distance from the weld. Over the range 25 to 649{sup 0}C the yield strength of the 16-8-2 weld metal exceeds the strength of the pipe both in the heat-affected zone and at a large distance from the weld. The yield strength of the pipe at the position of maximum residual stress from welding was similar to that of the 16-8-2 weld metal. Except at room temperature the ultimate tensile strength of the 16-8-2 weld metal (up to 649{sup 0}C) is considerably less than that of the type 316 stainless steel pipe. At room temperature their properties essentially do not differ. The ultimate tensile strength of the type 316 stainless steel pipe taken from different positions in the pipe does not differ. Creep-rupture properties were determined at 566 and 649{sup 0}C. The strength of the 16-8-2 weld metal was below that of the type 316 stainless steel pipe. However, there were indications that the strength of the weld metal approached the strength of the type 316 stainless steel pipe at long rupture times. This approach of properties was evident when the stress-minimum creep rate relationships were compared. The differences in the creep behavior of the 16-8-2 and type 316 stainless steel were explained by the metallurgical processes that occur in these stainless steels.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 711651
- Report Number(s):
- ORNL-5660
- Country of Publication:
- United States
- Language:
- English
Similar Records
Use of ultimate tensile strength to estimate the creep--rupture behavior of austenitic weld metals and castings
Mechanical properties of liquid-metal fast breeder reactor primary piping materials. [SS 304; SS 316]
Chemical Composition Effects on the Creep of Austenitic Stainless Steel Weld Metals
Technical Report
·
Mon Apr 30 20:00:00 EDT 1979
·
OSTI ID:6046556
Mechanical properties of liquid-metal fast breeder reactor primary piping materials. [SS 304; SS 316]
Journal Article
·
Thu Mar 31 23:00:00 EST 1977
· Nucl. Technol.; (United States)
·
OSTI ID:6545929
Chemical Composition Effects on the Creep of Austenitic Stainless Steel Weld Metals
Technical Report
·
Fri Apr 30 20:00:00 EDT 1982
·
OSTI ID:707303