Manganese and nitrogen in stainless steel SMA welds for cryogenic service
Evaluation of a shielded metal arc (SMA) weld test matrix in which manganese (1.5 to 10 wt-%) and nitrogen (0.04 to 0.26wt-%) were varied independently has clarified the effect of these elements on cryogenic mechanical properties and predicted ferrite number (FN). Several molybdenum and boron additions were also made, but they had no observable effect on strength or Charpy V-notch (CVN) absorbed energy. The matrix was based on a type 308L stainless steel weld metal composition. Desired compositions and constant FN were attained through alloy additions to the electrode coating. For each weld, one all-weld metal 4-K tensile specimen and five 76-K CVN impact specimens were tested. Increasing the nitrogen content from 0.05 to 0.25 wt-% linearly increased the 4-K yield strength from 600 to 1300 MPa (87 to 188.5 ksi) and decreased the 76-K lateral expansion from 0.6 to 0.1 mm (0.24 to 0.04 in.). Nitrogen reduced the 76-K CVN absorbed energy but not linearly. The addition of manganese slightly increased the yield strength and slightly decreased the lateral expansion. The 4-K tensile strength was relatively unaffected by alloy additions; values varied between 1300 and 1500 MPa (188.5 and 217.5 ksi). The DeLong FN predictive equation was improved by substituting the Szumachowski-Kotecki constant manganese term of 0.35 into the DeLong nickel equivalent. Analysis of the remaining FN deviation revealed an interaction between nitrogen and manganese. Addition of manganese-nitrogen interactive terms to the nickel equivalent increased the accuracy of the FN prediction.
- Research Organization:
- National Bureau of Standards, Fracture and Deformation Div., Boulder, CO
- OSTI ID:
- 6618029
- Journal Information:
- Weld. J. (Miami); (United States), Vol. 66:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
STAINLESS STEELS
ARC WELDING
IMPACT STRENGTH
TENSILE PROPERTIES
YIELD STRENGTH
BORON ADDITIONS
CHARPY TEST
CHEMICAL COMPOSITION
CRYOGENICS
FERRITES
FILLER METALS
MANGANESE
MOLYBDENUM ADDITIONS
NICKEL
NITROGEN
VERY HIGH PRESSURE
WELDED JOINTS
ALLOYS
BORON ALLOYS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
DESTRUCTIVE TESTING
ELEMENTS
FABRICATION
FERRIMAGNETIC MATERIALS
IMPACT TESTS
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
JOINING
JOINTS
MAGNETIC MATERIALS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
METALS
MOLYBDENUM ALLOYS
NONMETALS
OXYGEN COMPOUNDS
STEELS
TESTING
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WELDING
360101* - Metals & Alloys- Preparation & Fabrication
360103 - Metals & Alloys- Mechanical Properties