- Grade / Alloy
- Alloy 333
- EN / W.Nr.
- 2.4608
- AISI / SAE
- —
- UNS
- N06333
- Family
- Solid-solution alloy
Chemical composition
Chemical composition
Typical compositionTypical composition of the principal alloying elements; not a complete acceptance analysis.
| Element | Content (% by mass) |
|---|---|
| NiNickel | 46 |
| CrChromium | 25 |
| FeIron | 17 |
| MoMolybdenum | 3 |
| WTungsten | 3 |
| CoCobalt | 3 |
| MnManganese | 1.6 |
| SiSilicon | 1 |
Values describe the grade, not the analysis of a specific batch. The applicable product specification and material certificate determine acceptance. A dash does not mean zero.
The main role of 333
Alloy 333 serves applications where furnace atmosphere matters as well as temperature. Chromium, molybdenum, tungsten and other additions support its hot-surface resistance. Industrial heating and hot-gas equipment are its characteristic duties.
Resistance to carbon-bearing gases
Carburisation is the entry of carbon from a furnace atmosphere into a metal. Resistance to this effect is a recognised feature of 333. Oxidation resistance complements it where an installation also encounters oxygen-bearing conditions.
Furnace and heating applications
Retorts and furnace tubes contain heated atmospheres; supports and fan shafts also carry mechanical duties. Alloy 333 is used for these components, with thermal cycling resistance relevant to many installations. Carbon-fibre furnaces and flare tips are further examples.
Codes and commercial names
Alloy 333 is identified by 2.4608 and N06333; RA333 is a trade name associated with that identity. Its similar number does not make it identical to 330. Molybdenum and tungsten distinguish its composition, contributing to its separate identity as a hot-service and carburisation-resistant grade.
Typical application areas
Furnace tubes, retorts, fan shafts and hot-gas outlet components.
Product and cutting options
Relevant product forms for this material are listed below. Availability varies with grade and dimensions.