Hastelloy G-30 · UNS N06030 · W. Nr. 2.4603
Hastelloy G-30 (N06030): composition, properties, fittings and flanges
Hastelloy G-30 (N06030, W. Nr. 2.4603) is High-chromium nickel-iron-chromium-molybdenum alloy. Hastelloy G-30 is specified at Nickel Balance (about 42 %), Chromium 28.0 - 31.5, Molybdenum 4.00 - 6.00. Hastelloy G-30 carries about 30 % chromium, which makes it the preferred alloy for wet phosphoric acid and strongly oxidising…
- UNS
- N06030
- W. Nr.
- 2.4603
- Density
- 8.22 g/cm³ (0.297 lb/in³)
- Key strength
- 690 MPa / 100 ksi
Identification and standards
| Short form | Hastelloy G-30 · UNS N06030 · W. Nr. 2.4603 |
|---|---|
| Classification | High-chromium nickel-iron-chromium-molybdenum alloy |
| UNS | N06030 |
| Werkstoff number | 2.4603 |
| Material family | Hastelloy Alloys |
Chemical composition
| Element | Composition (wt %) | Why it is there |
|---|---|---|
| Nickel (Ni) | Balance (about 42 %) | Matrix and austenite stability |
| Chromium (Cr) | 28.0 - 31.5 | Oxidising acid resistance |
| Iron (Fe) | 13.0 - 17.0 | Matrix |
| Molybdenum (Mo) | 4.00 - 6.00 | Reducing acid and pitting resistance |
| Tungsten (W) | 1.50 - 4.00 | Pitting resistance |
| Copper (Cu) | 1.00 - 2.40 | Reducing acid coverage |
| Niobium (Nb) | 0.30 - 1.50 | Stabilisation |
| Carbon (C) | 0.03 max | - |
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) | 690 MPa / 100 ksi |
|---|---|
| 0.2 % yield strength, min | 324 MPa / 47 ksi |
| Elongation in 2 in, min | 40 % |
| Typical hardness, annealed | 180 - 230 HB |
| PREN, typical | About 45 |
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 | 8.22 g/cm³ (0.297 lb/in³) |
|---|---|
| Melting range | 1330 - 1370 °C (2425 - 2500 °F) |
| Modulus of elasticity | 202 GPa (29.3 x 10⁶ psi) |
| Thermal conductivity at 20 °C | 10.9 W/m·K |
| Mean coefficient of thermal expansion, 20-100 °C | 13.9 µm/m·°C |
| Specific heat capacity | 425 J/kg·K |
Specifications by product form
| Forgings & flanges | ASTM B564 / ASME SB-564 (UNS N06030) |
|---|---|
| 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 B582 / ASME SB-582 |
| Bar / rod | ASTM B581 / ASME SB-581 |
| Welding consumables | ERNiCrMo-11 |
| UNS / EN / China | UNS N06030 · W. Nr. 2.4603 |
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
- Wet process phosphoric acid evaporators and piping
- Mixed nitric and hydrofluoric acid pickling lines
- Commercial fertiliser and phosphate production equipment
- Strongly oxidising chemical process vessels
Welding, forming and machining
- Welding
- Weld with ERNiCrMo-11 filler by GTAW or GMAW. Good weldability; the niobium stabilisation limits heat affected zone precipitation.
- Heat treatment
- Solution anneal at 1175 °C and water quench.
- 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 Hastelloy G-30 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.