Haynes 230 · UNS N06230 · W. Nr. 2.4733
Haynes 230 (N06230): composition, properties, fittings and flanges
Haynes 230 (N06230, W. Nr. 2.4733) is Solid-solution strengthened Ni-Cr-W-Mo alloy with lanthanum. Haynes 230 is specified at Nickel Balance, Chromium 20.0 - 24.0, Tungsten 13.0 - 15.0. Haynes 230 gives Inconel 617 class oxidation resistance with better long-term thermal stability and much higher strength at 900 °C, making it…
- UNS
- N06230
- W. Nr.
- 2.4733
- Density
- 8.97 g/cm³ (0.324 lb/in³)
- Key strength
- 760 MPa / 110 ksi
Identification and standards
| Short form | Haynes 230 · UNS N06230 · W. Nr. 2.4733 |
|---|---|
| Classification | Solid-solution strengthened Ni-Cr-W-Mo alloy with lanthanum |
| UNS | N06230 |
| Werkstoff number | 2.4733 |
| Material family | High-Temperature Alloys / Superalloys |
Chemical composition
| Element | Composition (wt %) | Why it is there |
|---|---|---|
| Nickel (Ni) | Balance | Matrix |
| Chromium (Cr) | 20.0 - 24.0 | Oxidation resistance |
| Tungsten (W) | 13.0 - 15.0 | Solid-solution strengthening |
| Molybdenum (Mo) | 1.00 - 3.00 | Solid-solution strengthening |
| Cobalt (Co) | 5.00 max | Residual |
| Carbon (C) | 0.05 - 0.15 | Creep strength |
| Lanthanum (La) | 0.005 - 0.05 | Scale adhesion |
| Iron (Fe) | 3.00 max | Residual |
Note Single figures are maximum limits unless shown as a range. Always confirm against the heat-specific EN 10204 3.1 certificate supplied with your order.
Mechanical properties
| Tensile strength, min (annealed) | 760 MPa / 110 ksi |
|---|---|
| 0.2 % yield strength, min | 310 MPa / 45 ksi |
| Elongation in 2 in, min | 40 % |
| Typical hardness, annealed | 180 - 230 HB |
| ASME Section VIII Division 1 coverage | To about 900 °C |
Warning Values depend on product form, section thickness and heat treatment. Larger sections generally achieve lower strength than thin product; always design against the applicable code allowable stress rather than these figures.
Physical properties
| Density | 8.97 g/cm³ (0.324 lb/in³) |
|---|---|
| Melting range | 1301 - 1371 °C (2375 - 2500 °F) |
| Modulus of elasticity | 212 GPa (30.7 x 10⁶ psi) |
| Thermal conductivity at 20 °C | 8.9 W/m·K |
| Mean coefficient of thermal expansion, 20-100 °C | 12.4 µm/m·°C |
| Specific heat capacity | 397 J/kg·K |
Specifications by product form
| Forgings & flanges | ASTM B564 / ASME SB-564 (UNS N06230) |
|---|---|
| Butt weld fittings | ASTM B366 / ASME SB-366 (WP grade to order) |
| Seamless pipe & tube | ASTM B622 / B619 / ASME SB-622 |
| Plate / sheet / strip | ASTM B435 / ASME SB-435 |
| Bar / rod | ASTM B572 / ASME SB-572 |
| Welding consumables | ERNiCrWMo-1 |
| UNS / EN / China | UNS N06230 · W. Nr. 2.4733 |
Product forms available
Hangbo supplies this grade in the following forms. Sizes outside the listed range can often be produced to order.
- Forged flanges blanks and finished flanges to ASME B16.5, B16.47 Series A/B and B16.36
- Butt weld elbows, tees, reducers, caps and stub ends to ASME B16.9 and MSS SP-43
- Seamless pipe and tube to the applicable ASTM / ASME pipe specification
- Forged rings, discs and hubs machined to your drawing
Typical applications
- Gas turbine combustors, transition ducts and casings
- Heat treatment furnace muffles, retorts and baskets
- Nitric acid plant catalyst grid supports
- High-temperature heat exchangers and recuperators
Welding, forming and machining
- Welding
- Weld with ERNiCrWMo-1 filler by GTAW or GMAW. Excellent weldability; post-weld solution annealing is recommended for creep-critical fabrications.
- Heat treatment
- Solution anneal at 1175 - 1240 °C and rapid cool.
- Hot and cold forming
- Hot work in the range stated by the mill for this grade, then re-solution or re-age before final machining so that the delivered condition matches the certificate.
- Machining
- Machine with sharp carbide or high-speed steel tooling, positive rake, constant feed and ample coolant. Never dwell - the surface work-hardens quickly.
Buy Haynes 230 from Hangbo
Material is supplied with full heat-number traceability, solution annealing or ageing performed under calibrated furnace control, and an EN 10204 3.1 certificate covering chemical analysis, mechanical properties, heat treatment records and the agreed NDT scope. Positive material identification and third party inspection and test reports from SGS are available for critical service.