8.0 – 10.0
19.0 – 21.5
5.5 – 7.5
0.15 – 0.40
General characteristics of Nitronic 40
This alloy is a high-manganese austenitic stainless steel with a strengthening nitrogen addition. It has high strength in the annealed condition, together with excellent oxidation resistance at high temperatures, and good corrosion resistance at ambient temperatures. It may be easily fabricated and welded.
Among other applications, this alloy has been used in chemical process and pollution control equipment, steam and autoclave applications and for various aircraft engine components.
The normal forging temperature for this alloy is 2100/2200ºF (1150/1205ºC) and forgings may be safely rapidly cooled. Material may be forged down to 1200ºF (650ºC) with no risk of hot shortness. For best corrosion resistance, parts should be annealed after forging.
Annealing is used to give best stress rupture life and for operating temperatures between 1300/1600ºF (705/870ºC.) The alloy is not recommended for service above 1600ºF (870ºC.)
Annealing is normally carried out between 1800/2150ºF (980/1175ºC), the temperature being determined by hardness requirements and grain size restrictions.
Stress Relief may be used following cold working, and is normally performed at 900/1400ºF (480/760ºC) but there is little change in hardness until 1250ºF (675ºC) above which temperature rapid softening of the alloy takes place.
The alloy may be machined using the techniques for normal austenitic stainless steels, with rigid equipment and adequate cooling being necessities. The use of carbide tooling, as opposed to high speed steel tooling, will result in significant increases in machining feeds and speeds.
The alloy may be welded using shielded fusion and resistance welding processes. Oxyacetylene welding is not recommended as carbon pickup may occur. A postweld anneal will restore resistance to intergranular corrosion.
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