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AMS HP 9-4-20 Details

AMS HP 9-4-20 Standard Download

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HP 9-4-20 Application:Steel, Bars, Forgings, Tubing, and Rings 0.75Cr - 9.0Ni - 4.5Co - 1.0Mo - 0.09V (0.17 - 0.23C) Consumable Electrode Vacuum Melted

Category Type Grade Microstructure Designations
Grades Stainless Steels HP 9-4-20 Precipitation-Hardening USA - AMS , SAE AMS 6525D (2012) - Steel, Bars, Forgings, Tubing, and Rings 0.75Cr - 9.0Ni - 4.5Co - 1.0Mo - 0.09V (0.17 - 0.23C) Consumable Electrode Vacuum Melted
SAE AMS 6525 - This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, flash welded rings, and stock for forging or flash welded rings.
AMS 6523 - This specification covers a premium aircraft-quality, low-alloy steel in the form of sheet, strip, and plate.

Chemical composition(wt.%) of HP 9-4-20 grade: SAE AMS 6525D (2012)

Elements Min.（≥） Max.（≤） Similar Remarks
C 0.17 0.23
Si - 0.20
Mn 0.20 0.40
Ni - 0.65
Cr 0.65 0.85
Mo 0.90 1.10
Ni 8.50 9.50
V 0.06 0.12
P - 0.01
S - 0.01
Cu - 0.35
Co 4.25 4.75
Steel, Bars, Forgings, Tubing, and Rings 0.75Cr - 9.0Ni - 4.5Co - 1.0Mo - 0.09V (0.17 - 0.23C) Consumable Electrode Vacuum Melted

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  
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 HP 9-4-20 Steel K91472  
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  

Mechanical properties of grade HP 9-4-20 SAE AMS 6525D (2012)

Proof strength
Rp0.2 (MPa)		 Tensile strength
Rm (MPa)		 Impact energy
KV (J)		 Elongation at fracture
A (%)		 Reduction in cross section on fracture
Z (%)		 As-Heat-Treated Condition Brinell hardness (HBW)
273 (≥) 847 (≥) 14 11 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 433

Physical properties of grade HP 9-4-20 SAE AMS 6525D (2012)

Property Density
kg/dm3		 Temperature T
°C/F		 Specific heat
J / kgK		 Thermal conductivity
W/mK		 Electric resistance
µΩ·cm		 Modulus of elasticity
kN/mm2		 Expansion rate
736 (≥) 779 (≥) 21 41 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 232
Temp.
°C/°F		 Creep strain limit
(10000h)
(Rp1,0) N/mm2		 Creep rupture strength
(10000h)
(Rp1,0) N/mm2
117 462 625

HP 9-4-20 - Form of Supply

Product type Products Dimension Processes Deliver Status
Plates / Sheets Plates / Sheets 0.08-200mm(T)*W*L Forging, hot rolling and cold rolling Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar Round Bar, Flat Bar, Square Bar Φ8-1200mm*L Forging, hot rolling and cold rolling, Cast Black, Rough Turning, Shot Blasting,
Coil / Strip Steel Coil /Steel Strip 0.03-16.0x1200mm Cold-Rolled & Hot-Rolled Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes Seamless Pipes/Tubes, Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion, Cold Drawn, Welded Annealed, Solution and Aging, Q+T, ACID-WASHED

Cross Reference Table(Equivalent Grade)

Grade Standard Country Application
A 646 Grade HP 9-4-20 SAE USA
Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings
HP 9-4-20 ASTM USA
Steel, Sheet, Strip, and Plate 0.75Cr - 9.0Ni - 4.5Co - 1.0Mo - 0.09V (0.17 - 0.23C) Vacuum Consumable Electrode Melted, Annealed
HP 9-4-20 ASTM USA
Steel, Bars, Forgings, Tubing, and Rings 0.75Cr - 9.0Ni - 4.5Co - 1.0Mo - 0.09V (0.17 - 0.23C) Consumable Electrode Vacuum Melted
HP 9-4-20 UNS USA
Steel, Sheet, Strip, and Plate 0.75Cr - 9.0Ni - 4.5Co - 1.0Mo - 0.09V (0.17 - 0.23C) Vacuum Consumable Electrode Melted, Annealed
HP 9-4-20 AMS USA
Steel, Bars, Forgings, Tubing, and Rings 0.75Cr - 9.0Ni - 4.5Co - 1.0Mo - 0.09V (0.17 - 0.23C) Consumable Electrode Vacuum Melted
HP 9-4-25 ASTM USA
Steel Sheet, Strip, and Plate 0,48Cr - 8,0Ni - 4,0Co - 4,48Mo - 0,09V - (0,24 - 0,30C) Consumable Electrode Melted, Annealed
HP 9-4-25 UNS USA
Steel Sheet, Strip, and Plate 0,48Cr - 8,0Ni - 4,0Co - 4,48Mo - 0,09V - (0,24 - 0,30C) Consumable Electrode Melted, Annealed
A 646 Grade HP 9-4-30 SAE USA
Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings
HP 9-4-30 ASTM USA
Steel, Sheet, Strip, and Plate 1.0Cr - 7.5Ni - 4.5Co - 1.0Mo - 0.09V (0.29 - 0.34C) Consumable Electrode Vacuum Melted, Annealed
HP 9-4-30 ASTM USA
Steel, Bars, Forgings, Tubing, and Rings 1.0Cr - 7.5Ni - 4.5Co - 1.0Mo - 0.09V (0.29 - 0.34C) Consumable Electrode Vacuum Remelted, Annealed
HP 9-4-30 UNS USA
Steel, Sheet, Strip, and Plate 1.0Cr - 7.5Ni - 4.5Co - 1.0Mo - 0.09V (0.29 - 0.34C) Consumable Electrode Vacuum Melted, Annealed
HP 9-4-30 UNS USA
Steel, Bars, Forgings, Tubing, and Rings 1.0Cr - 7.5Ni - 4.5Co - 1.0Mo - 0.09V (0.29 - 0.34C) Consumable Electrode Vacuum Remelted, Annealed

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