Perfect for applications in the Thermal Processing industry
RA330® can be used in a variety of applications including:
- Muffles and retorts
- Quenching fixtures
- Furnace, fans and shafts
- Hot pressing platens
- Bar baskets
- Radiant tubes
- Salt pots – both neutral and cyanite
- Tube hangers for crude oil heaters and steam boilers
The chemical composition of RA330® has changed over the years to allow for improved performance in the thermal process industry.
RA330® is the workhorse of the heat resistant alloys with good strength and oxidising resistance up to 1148°C. In addition, the alloy is excellent in carburising and nitriding environments.
The properties of RA330® are enhanced by a nominal 1.25% silicon addition. It has been designed to withstand thermal shock induced by liquid quenching.
RA330® finds wide applications in high temperature environments where good resistance to the combined effect of carburisation and thermal cycling conditions are the prime requisite.
RA330® remains fully austenitic at all temperatures so it is not subject to sigma embrittlement. It is highly resistant to chloride-induced stress corrosion cracking and thus an alloy of choice where common stainless grades have failed by stress corrosion cracking.
RA330® can be fabricated and machined using procedures used for stainless steels or nickel-chromium alloys. Heat treatment is not necessary after most forming and welding operations. When required, the recommended full anneal is 1038-1371°C, rapid air cool or water quench. RA330® can be readily welded using RA330-04® or other weld fillers of matching conditions.
- 7944 g/cm³