NO AMS SPECIFICATION. The only specification for this alloy that four independent sources confirm is ASTM B637 \/ ASME SB-637 (UNS N07080; rod, bar, forgings and forging stock). ASTM B637 does NOT cover flat product (plate, sheet, strip) or tube.
The AMS numbers shown on the page could not be confirmed. AMS 5829 belongs to Nimonic 90 (UNS N07090), not to this alloy;<\/span><\/div>\n<\/div>\n\n
Advantage<\/div>\n
After precipitation hardening the ASTM B637 minimums are 930 MPa tensile strength, 620 MPa yield strength and 20% elongation, and the same material is used in continuous service to 815 \u00b0C.<\/div>\n<\/div>\n
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Welding<\/div>\n
Sheet is joined by the resistance welding processes. TIG and MIG fusion welding is usable on thin sections; as the section gets thicker, micro-fissuring appears in the weld and in the heat affected zone. Post-weld heat treatment is necessary to restore properties.<\/div>\n<\/div>\n
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Limits<\/div>\n
The service temperature ceiling is 815 \u00b0C; the producer bulletins define the alloy up to that temperature. Because ageing is carried out at 690-710 \u00b0C, long-term service above that temperature coarsens the \u03b3\u2032 precipitate and the hardening effect falls away \u2014 this mechanism is why the service ceiling is held at 815 \u00b0C;<\/div>\n<\/div>\n