A nickel-iron-chromium grade, RA330® offers an exceptional combination of strength and resistance to carburisation, oxidation and thermal shock.
RA330® was created to service the needs of the thermal process industries with a reliable source of a wrought product that could handle high temperature carburizing and nitriding conditions with repeated quenching. RA330® has excellent oxidation resistance up to 1148°C.
Inventory
Product form
Size range from
Size range to
RA330® expanded metal
To customer specifications
To customer specifications
RA330® pipe
0.5 in
6 in
RA330® round bar
3.175 mm
152.4 mm
RA330® sheet & plate
1.22 mm
76.2 mm
RA330® welding wire
0.89 mm
3.175 mm
RA330® coil
1.22 mm
3.25 mm
RA330® pipe fittings
0.5 in
6 in
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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
About RA330®
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.
RA330® is the registered trademark of Rolled Alloys Inc.