Alloy 90
Material
Alloy 90, UNS N07090, W.Nr. 2.4632, 2.4969, GH4090
Overview
Alloy 90 is a wrought nickel-chromium-cobalt base alloy strengthened by additions of titanium and aluminum. It has been developed as an age-hardenable creep- resisting alloy for service at temperatures up to 920°C (1688°F). The alloy has high tensile strength and creep resistance, good oxidation resistance and corrosion resistance in 815~870°C, high fatigue strength and good formability and weldability under the action of repeated cold and heating.
Application
The alloy is used for turbine blades, discs, forgings, ring sections, fasteners, clamp, seal ring, elastic element and hot-working tools.
Chemical composition (wt%)
| Fe | Ni | Co | Cr | Zr | Ti | Pb | B | Bi |
|---|---|---|---|---|---|---|---|---|
| ≤1.50 | Balance | 15.0-21.0 | 18.0-21.0 | ≤0.15 | 2.00-3.00 | ≤0.0020 | ≤0.02 | ≤0.0001 |
| Cu | C | Al | Mn | Si | P | S | Ag | |
| ≤0.20 | ≤0.13 | 1.00-2.00 | ≤1.00 | ≤1.00 | ≤0.020 | ≤0.015 | ≤0.0005 |
Mechanical property
| Tensile strength ksi (MPa) min. |
Yield strength at 0.2 offset ksi (MPa) min. |
Elongation at fracture min. | Reduction of Area min. |
|---|---|---|---|
| 170 (1175) | 109 (752) | ≥30 | 45% |
Microstructure
The main enhancement of the alloy is the γ′-Ni3(Al、Ti), which precipitates into different square particles in the grain, which is also visible in the grain boundary. The carbide is precipitated in a discontinuous strand in the grain boundary.
Available process
Cold worked and bright annealed
Cold worked, bright annealed, polished (MP, EP etc.)
Common tests
- ◎ Chemical composition
- ◎ Tension
- ◎ Hardness
- ◎ Flaring
- ◎ Flange
- ◎ Flattening
- ◎ Micro structure
- ◎ Hydrostatic
- ◎ NDT
- ◎ Intergranular Corrosion
- ◎ Surface condition
- ◎ Shape and dimension
- ◎ Positive Material Identification
Product forms
Capillary tube
- ◎ OD 0.30 ~ 3.0 mm
- ◎ WT 0.05 ~ 0.5 mm
Precision seamless tube
- ◎ OD 3.0 ~ 89 mm
- ◎ WT 0.10 ~ 10.0 mm
HP / UHP BA+ tube
- ◎ OD 3.0 ~ 76 mm
- ◎ WT 0.10 ~ 10.0 mm
Service
- ◎ Precision cutting
- ◎ Tube surface treatment, like ID surface super mirror polishing, best level could reach Ra0.0015um
- ◎ Tube deep processing, like coiling, bending, end forming, body forming, laser processing, various needles processing, built to drawing and sample, etc.