NAS 750GHeat Resistant Nickel Base Alloy
Characteristics of NAS 750
A precipitation hardening alloy with a nickel base, NAS 750 provides corrosion resistance along with superior tensile strength, creep rupture and fatigue resistance up to 700. It is used in a wide range of applications such as aircraft and power generation gas turbine parts, nuclear reactor parts, pressure vessels, heat-resistant springs and hot working tools.
Chemical Composition
(%)
| - | C | Si | Mn | P | S | Ni | Cr | Cu | Co | Al | Ti | Fe | Nb+Ta | Ta |
| JIS G4902 NCF750 |
0.08 | 0.50 | 1.00 | 0.030 | 0.015 | 70.00 | 14.0` 17.0 |
0.50 | - | 0.40` 1.00 |
2.25` 2.75 |
5.00` 9.00 |
0.70` 1.20 |
- |
| SAE AMS 5542 |
0.08 | 0.50 | 1.00 | - | 0.01 | 70.00 | 14.0` 17.0 |
0.50 | 1.00 | 0.40` 1.00 |
2.25` 2.75 |
5.00` 9.00 |
0.70` 1.20 |
0.05 |
| NAS 750 | 0.02 | 0.09 | 0.05 | 0.006 | 0.001 | 73.98 | 15.27 | 0.01 | 0.04 | 0.73 | 2.46 | 6.47 | 0.82 | 0.00 |
Corresponding Standard
NAS 750 corresponds to the following standard.
JIS G4902 / NCF750
SAE AMS 5542
Mechanical properties of solution heat treated NAS 750
| Grade | 0.2% Proof stress (MPa) |
Tensile strength (MPa) |
Elongation ij |
Hardness iHVj |
G.S.N. |
| JIS G4902 NCF750 S1 | - | 890 | 40 | 335 | - |
| SAE AMS 5542 | 448 | 896 | 40 | - | 2.5 |
| NAS 750 ( 5.6mmt) Solution heat treated |
429 | 818 | 48 | 175 | 6.5 |
Mechanical properties of aging hardened NAS 750 following solution heat treatment
| Grade | 0.2% Proof stress (MPa) |
Tensile strength (MPa) |
Elongation ij |
Hardness iHVj |
| JIS G4902 NCF750 H1 | 615 | 960 | 8 | 270 |
| NAS 750 (5.6mmt) JIS H1 Aging treated* |
754 | 1168 | 25 | 365 |
| SAE AMS 5542 | 689 | 1069 | 20 | 30HRC (302HV) |
| NAS 750 (5.6mmt) 700~20hr Aging treated** |
876 | 1230 | 25 | 391 |
*JIS H1 treatment: Holding at 800`830 for 24 hours followed by air cooling to room temperature ¨@Holding at 690`720 for 20 hours followed by rapid cooling.
**AMS 5542 treatment: Holding at 704}14 for 20 hours followed by rapid cooling.
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