Chemical Composition
| Grade Symbol |
Alloy |
Elements |
Composition % |
| F9
|
9 % chromium |
Carbon |
0.15 max |
| Manganese |
0.30–0.60 |
| Phosphorus |
0.030 max |
| Sulfur |
0.030 max |
| Silicon |
0.50 - 1.00 |
| Chromium |
8.0 - 10.0 |
| Molybdenum |
0.90 – 1.10 |
Mechanical Properties
| Property | Value |
|---|
| Tensile Strength, min, ksi [MPa] |
85 [585] |
| Yield Strength, min, ksi [MPa] |
55 [380] |
| Elongation in 2 in. [50mm] or 4D, min, % |
20 |
| Reduction or Area, min, % |
40 |
| Brinell Hardness Number, HBW |
179-217 |
Heat Treatment
After hot working, forgings shall be cooled to a temperature below 1000 °F [538 °C] prior to heat treating in accordance with the requirements.
