GH90
Chinesegrade: GH90 cobalt-based superalloy
British grade: Nimonic90
I. Overview of GH90:
GH90 cobalt-based alloy is anage-strengthened nickel-based deformed superalloy, which contains a higheramount of cobalt and various strengthening elements. The alloy has high tensilestrength and creep resistance , good oxidation resistance and corrosionresistance at 815 ～ 870 ℃, and high fatigue strength and good formability and weldabilityunder condition of repeated alternating cold and heat. It could be supplied inform of hot-rolled and cold-drawn bars, cold-rolled plates, strips andcold-drawn wire. The alloy is extensively used in turbine engine turbine disks,blades, high-temperature fasteners, clamps, seals and elastic components.
1, Chemical composition %
C≤ | Si≤ | Mn≤ | P≤ | S≤ | Cr≥ | Ni≥ | Mo≥ | Cu≤ |
13 | 0.8 | 0.4 | 0.02 | 0.015 | 18.0-21.0 | Balance | - | 0.2 |
Other | Zr≤ | Al≤ | Ti≤ | Fe≤ | Co≤ | Ag≤ | Pb≤ | B≤ |
0.15 | 1.0-2.0 | 2.0-3.0 | 1.5 | 15.0-21.0 | 0.005 | 0.002 | 0.02 |
Note: For wire, ω (pb) ≤ 0.0010%.
II. Physical andchemical properties:
1. Thermal performance:
(1) Melting temperature range: meltingpoint 1400 ° C.
(2) Thermal conductivity:
θ/℃ | 600 | 700 | 800 |
λ/(W/(m · ℃)) | 21.76 | 23.93 | 25.57 |
(3) linear expansion coefficient:
θ/℃ | 20 ～ 100 | 20 ～ 200 | 20 ～ 300 | 20 ～ 400 | 20 ～ 500 | 20 ～ 600 | 20 ～ 800 | 20 ～ 900 |
α1/10-6 ℃ -1 | 12.71 | 13.09 | 13.51 | 14.04 | 14.52 | 15.03 | 16.36 | 17.38 |
2. Density: ρ = 8.20g/cm3.
3. Magnetic properties: non-magnetic.
4. Chemical properties: The alloy has goodoxidation resistance and corrosion resistance below 1040 ℃; apt to form intergranular oxidation above1040 ℃.
