- Grade / Alloy
- Alloy 230
- EN / W.Nr.
- 2.4733
- AISI / SAE
- —
- UNS
- N06230
- 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 | Balance |
| CrChromium | 20–24 |
| FeIron | ≤ 3 |
| MoMolybdenum | 1–3 |
| WTungsten | 13–15 |
| CoCobalt | ≤ 5 |
| MnManganese | 0.3–1 |
| SiSilicon | 0.25–0.75 |
| AlAluminium | 0.2–0.5 |
| CCarbon | 0.05–0.15 |
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 distinctive composition of 230
Tungsten is a prominent addition to the nickel–chromium composition of 230. Tungsten and molybdenum support hot strength, while chromium contributes to surface protection. The alloy therefore serves both hot-gas surfaces and mechanically loaded hot components.
Heat combined with sustained load
Creep is gradual deformation under load at elevated temperature. It is important in turbines and industrial heating equipment. Alloy 230 is known for sustained-temperature strength, complemented by oxidation resistance at the hot-gas surface.
Applications from turbines to furnaces
Turbine applications include combustion chambers, transition ducts and flame holders. Furnace retorts, baskets, supports and thermocouple sheaths are other examples, along with high-temperature exchangers in chemical processing.
Distinction from other hot-service alloys
230 is distinct from 617 and Alloy X, with tungsten among its notable compositional differences. It is identified by 2.4733 and N06230. Shared hot-service applications do not remove these separate grade identities.
Typical application areas
Turbine combustion parts, hot-gas ducts, thermocouple sheaths and furnace hardware.
Product and cutting options
Relevant product forms for this material are listed below. Availability varies with grade and dimensions.