ELECTRODES FOR WELDING TYPE 347 STAINLESS STEEL, SUMMARY REPORT

Technical Report · Mon Jul 31 04:00:00 EDT 1961

DOI:https://doi.org/10.2172/4831839· OSTI ID:4831839

Moore, T J; Gunia, R B

In a ten-year study of filler metal compositions and techniques for welding niobium-stabilized 18-8 stainless steel, seven electrode compositions were evaluated. The correct cholce among these electrodes depends on the temperature, surroundings, and other conditions of service. It was confirmed that weld metals containing ferrite are highly resistant to hot-cracking and fissuring. However, one undesirable effect of ferrite-bearing weld metal is the tendency for the ferrite phase to transform to the brittle sigma phase during service at elevated temperature. In order to avoid the ferrite-to-slgma transition, it would be desirable to use fully austenitic Type-347 welds. Both high-carbon and high manganese Type-347 electrodes were included ln the development and testing program. Tests of a partially ferrite Type-308L weld indicated that this composition was the most corrosion resistant of the compositions tested. The ability to retain notch-toughness after exposure to elevated temperatures and the retention of notch-toughness at extremely low temperatures were also higher for Type-308L. The principal drawback to the Type- 308L weld deposit was its low elevated temperature strength, compared with Type347 material. The addition of nitrogen to Type-308L improves the properties. An electrode containing 16% chromium, 8% nickel, and 2% molybdenum was shown to have some desirable properties for certain applications. Both Type-308L and -347 were shown to have extremely high corrosion rates after aging in the 800 to 1050 deg F range. The corrosion danger zone for 18-8 weld metals at 800 deg F begins at 1000 hours. (N.W.R.)

• Research Organization: Arcos Corp., Philadelphia; United Steel Corp., Pittsburgh
• NSA Number: NSA-16-003428
• OSTI ID: 4831839
• Report Number(s): NYO-9725
• Country of Publication: United States
• Language: English

Related Subjects

AUSTENITE
BRITTLENESS
CARBIDES
CHROMIUM ALLOYS
CORROSION
CRACKS
ELECTRODES
HIGH TEMPERATURE
IMPURITIES
LOW TEMPERATURE
MANGANESE ALLOYS
MECHANICAL PROPERTIES
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NIOBIUM ALLOYS
NITROGEN
STAINLESS STEELS
TEMPERATURE
TESTING
WELDING