Tech Steel & Materials
Steel HP 9-4-20
HP 9-4-20 typically has Yield Strength (YS) of 200-205 KSI, but there are other properties that have desirable values such as through-hardening, Charpy Impact Toughness of 84ft-lbs and elongation values of 14 to 18%. The YS value can be driven up approaching 235ksi; however, the fracture toughness value falls off quickly.
Chemical Properties
| Element |
min |
max |
| Carbon |
0.17 |
0.23 |
Manganese |
0.20 |
0.40 |
| Silicon |
– |
0.20 |
Phosphorus |
– |
0.010 |
| Sulfur |
– |
0.010 |
Chromium |
0.65 |
0.85 |
| Nickel |
8.50 |
9.50 |
Cobalt |
4.25 |
4.75 |
| Molybdenum |
0.90 |
1.10 |
Vanadium |
0.06 |
0.12 |
| Copper |
– |
0.35 |
Mechanical Properties Minimum Tensile
| Property |
Value |
| Tensile Strength |
190 ksi |
Yield Strength at 0.2% Offset |
180 ksi |
| Elongation in 4D |
12% |
Reduction of Area |
45% |
Select AMS Number:
| AMS Number |
Alloy |
Type |
UNS |
Cross Ref. Spec |
Misc./Shape |
| AMS 6468 |
HP 9-4-20 |
Steel |
K91461 |
- |
Wire |
| AMS 6523 |
HP 9-4-20 |
Steel |
K91472 |
- |
Plate |
| AMS 6523 |
HP 9-4-20 |
Steel |
K91472 |
- |
Sheet |
| AMS 6523 |
HP 9-4-20 |
Steel |
K91472 |
- |
Strip |
| AMS 6525 |
HP 9-4-20 |
Steel |
K91472 |
- |
Bar |
| AMS 6525 |
HP 9-4-20 |
Steel |
K91472 |
- |
Forging |
| AMS 6525 |
HP 9-4-20 |
Steel |
K91472 |
- |
Ring |
| AMS 6525 |
HP 9-4-20 |
Steel |
K91472 |
- |
Tubing |
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