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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 HP 9-4-20
AMS 6523 HP 9-4-20 Steel K91472  
AMS 6523 Plate HP 9-4-20 Steel K91472 - Plate AMS 6523 Plate
AMS 6523 Sheet HP 9-4-20 Steel K91472 - Sheet AMS 6523 Sheet
AMS 6523 Strip HP 9-4-20 Steel K91472 - Strip AMS 6523 Strip
AMS 6525 HP 9-4-20 Steel K91472  
AMS 6525 Bar HP 9-4-20 Steel K91472 - Bar AMS 6525 Bar
AMS 6525 Forging HP 9-4-20 Steel K91472 - Forging AMS 6525 Forging
AMS 6525 Ring HP 9-4-20 Steel K91472 - Ring AMS 6525 Ring
AMS 6525 Tubing HP 9-4-20 Steel K91472 - Tubing AMS 6525 Tubing