Steel HP 9-4-20 View AMS Numbers >
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 Plate | HP 9-4-20 | Steel | K91472 | - | Plate |
![]() |
AMS 6523 Sheet | HP 9-4-20 | Steel | K91472 | - | Sheet |
![]() |
AMS 6523 Strip | HP 9-4-20 | Steel | K91472 | - | Strip |
![]() |
AMS 6525 Bar | HP 9-4-20 | Steel | K91472 | - | Bar |
![]() |
AMS 6525 Forging | HP 9-4-20 | Steel | K91472 | - | Forging |
![]() |
AMS 6525 Ring | HP 9-4-20 | Steel | K91472 | - | Ring |
![]() |
AMS 6525 Tubing | HP 9-4-20 | Steel | K91472 | - | Tubing |
![]() |