1.Standard
API Standard: 6ACRA2. Chemical Composition
| Elements | C | Mn | P | S | Si | Cr | Mo | Ni | Ti | Nb+Ta | Fe | Co | Cu | B | Al |
| Min | 17.0 | 2.8 | 50.0 | 0.65 | 4.75 | 0.2 | |||||||||
| Max | 0.08 | 0.35 | 0.015 | 0.015 | 0.35 | 21.0 | 3.3 | 55.0 | 1.15 | 5.50 | remainder | 1.0 | 0.3 | 0.006 | 0.8 |
|
Actual Value |
0.037 | 0.21 | 0.005 | 0.008 | 0.13 | 18.29 | 2.92 | 53.74 | 0.79 | 4.82 | 17.47 | 0.004 | 0.014 | 0.0025 | 0.69 |
3. Mechanical Properties
| Mechanical Properties |
Tensile Strength MPa |
Yield Strength MPa |
Elongation % |
Grain Size |
| Min | 793 | 758 | 12 | 4 |
| Max | 965 | |||
| Actual value | 1275 | 932 | 32 | 5 |
4. Typical Size
| 规格Size |
Outside Diameter mm |
Permissible Variations in Outside Diameter mm |
Wall Thickness mm |
Average Wall Permissible Variations in Wall Thickness |
| 115×11 | 115 | ±0.69 | 11 | ±8.0%S |
Note:Standard requirements control range: OD：±0.69mm，WT：±8.0%S
5. Typical Application Environment
UNSN07718 can be widely used in all kinds of high requirements of working condition due to its high temperature strength , excellent corrosion resistance at 700 ℃.
Steam turbine,
Liquid fuel rockets.
Cryogenic engineering
Acidic environment
Nuclear engineering