GH3039 · GB GH3039
GH3039 (-): composition, properties, fittings and flanges
GH3039 (GH3039, GB GH3039) is Solid-solution strengthened Ni-Cr-Mo-Nb Chinese high-temperature alloy. GH3039 is specified at Nickel Balance, Chromium 19.0 - 22.0, Molybdenum 1.80 - 2.30. GH3039 is the Chinese solid-solution superalloy for sheet fabrications and furnace hardware to about 800 °C, combining molybdenum and niobium…
- UNS
- -
- W. Nr.
- -
- Density
- 8.30 g/cm³ (0.300 lb/in³)
- Key strength
- 735 MPa / 107 ksi
Identification and standards
| Short form | GH3039 · GB GH3039 |
|---|---|
| Classification | Solid-solution strengthened Ni-Cr-Mo-Nb Chinese high-temperature alloy |
| UNS | - |
| Werkstoff number | - |
| Material family | High-Temperature Alloys / Superalloys |
Chemical composition
| Element | Composition (wt %) | Why it is there |
|---|---|---|
| Nickel (Ni) | Balance | Matrix |
| Chromium (Cr) | 19.0 - 22.0 | Oxidation resistance |
| Molybdenum (Mo) | 1.80 - 2.30 | Solid-solution strengthening |
| Niobium (Nb) | 0.90 - 1.30 | Carbide stability and strength |
| Aluminium (Al) | 0.35 - 0.75 | Scale adherence |
| Titanium (Ti) | 0.35 - 0.75 | Minor hardening |
| Iron (Fe) | 3.00 max | Residual |
| Carbon (C) | 0.08 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 | 735 MPa / 107 ksi |
|---|---|
| 0.2 % yield strength, min | 340 MPa / 49 ksi |
| Elongation, min | 40 % |
| Typical hardness | 170 - 210 HB |
| Useful continuous service temperature | About 800 °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 | 8.30 g/cm³ (0.300 lb/in³) |
|---|---|
| Melting range | 1350 - 1400 °C (2460 - 2550 °F) |
| Modulus of elasticity | 203 GPa (29.4 x 10⁶ psi) |
| Thermal conductivity at 20 °C | 12.1 W/m·K |
| Mean coefficient of thermal expansion, 20-100 °C | 12.8 µm/m·°C |
| Specific heat capacity | 455 J/kg·K |
Specifications by product form
| Forgings & flanges | GB/T 14992 / GB/T 14994 (GH3039) |
|---|---|
| Butt weld fittings | To order against GB/T 14992 chemistry |
| Seamless pipe & tube | GB/T 15062 or to order |
| Plate / sheet / strip | GB/T 14995 |
| Bar / rod | GB/T 14994 |
| Welding consumables | ERNiCr-3 or matching GH3039 filler |
| UNS / EN / China | GB GH3039 |
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
- Aero-engine combustion chamber and afterburner sheet parts
- Furnace muffles, trays and radiant tube supports
- Heat exchanger and ducting fabrications to 800 °C
- Domestic Chinese turbine hot-section fabrications
Welding, forming and machining
- Welding
- Weld by GTAW with matching or ERNiCr-3 filler. Good weldability for a solid-solution grade; stress relieve after heavy forming.
- Heat treatment
- Solution anneal at 1080 - 1120 °C and air or water 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 GH3039 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.