17-4PH VAR AMS 5622
17-4 PH VAR AMS 5622 Stainless Steel is a precipitation hardening martensitic stainless steel. Typical use is seen in applications requiring high strength and a modest level of corrosion resistance. Strength and toughness desired can be manipulated by a temperate range in the heat treatment process. Standard specification is AMS 5622 and AMS 5643.
Stock sizes: 0.7875” to 9.000” diameter
Common Specifications:
- AMS 5622 Type 1
- AMS 5643
- PW LCS F-17
- GE S-400 (S-SPEC-35)
Industry Trade Names:
- Type 630
- UNS S17400
Common Applications:
- Aircraft
- Gas turbines
- Chemical processing equipment
- Nuclear reactors
Bars shall be solution heat treated in accordance with AMS-H-6875 by heating to 1900 °F ± 25 °F (1038 °C ± 14 °C), holding a heat for a time commensurate with section thickness and cooling as required to below 90°F (32 °C).
In the solution heat treated condition the hardness of the bars shall not exceed 363 HB.
Products 8” diameter and less shall meet the following microstructure requirements:
The precipitation heat treat requirements are as follows:
Macrostructure Limits:
| Class | Condition | Severity |
|---|---|---|
| 1 | Freckles | A |
| 2 | White Spots | A |
| 3 | Radial Segregation | A |
| 4 | Ring Pattern | B |
Composition
| Element | Min. | Max. |
|---|---|---|
| Carbon | — | 0.07 |
| Manganese | — | 1.00 |
| Silicon | — | 1.00 |
| Phosphorus | — | 0.0025 |
| Sulfur | — | 0.015 |
| Chromium | 15.00 | 17.50 |
| Nickel | 3.00 | 5.00 |
| Molybdenum | — | 0.50 |
| Copper | 3.00 | 5.00 |
| Columbium | 5xC | 0.45 |
| Condition | Temperature | Time |
|---|---|---|
| H900 | 900 °F ± 10 °F (482 °C ± 6°C) | 1 hour + 15/-0 minutes |
| H925 | 925 °F ± 10 °F (496 °C ± 6°C) | 4 hours + 30/-0 minutes |
| H1025 | 1025 °F ± 10 °F (552 °C ± 6°C) | 4 hours + 30/-0 minutes |
| H1075 | 1075 °F ± 10 °F (579 °C ± 6°C) | 4 hours + 30/-0 minutes |
| H1100 | 1100 °F ± 10 °F (593 °C ± 6°C) | 4 hours + 30/-0 minutes |
| H1150 | 1150 °F ± 10 °F (621 °C ± 6°C) | 4 hours + 30/-0 minutes |
Minimum tensile properties after precipitation heat treating shall be in accordance to:
Minimum tensile strength properties, inch/pound units
| Condition | Specimen Orientation | Tensile Strength ksi | Yield Strength at 0.2% Offset ksi | Elongation in 2 inches or 4D % | Reduction of Area % |
|---|---|---|---|---|---|
| H900 | Longitudinal Transverse | 190 190 | 170 170 | 10 5 | 35 15 |
| H925 | Longitudinal Transverse | 170 170 | 155 155 | 10 6 | 38 20 |
| H1025 | Longitudinal Transverse | 155 155 | 145 145 | 12 7 | 45 27 |
| H1075 | Longitudinal Transverse | 145 145 | 125 125 | 13 8 | 45 28 |
| H1100 | Longitudinal Transverse | 140 140 | 115 115 | 14 9 | 45 29 |
| H1150 | Longitudinal Transverse | 135 135 | 105 105 | 16 10 | 50 30 |
