Hy-Tuf VAR AMS 6425

Hy-Tuf is a high strength low alloy steel. It exhibits good strength, ductility and fracture toughness. 

Stock sizes: 1.500”dia to 3.500” diameter

Common Specifications:

  • AMS 6425
  • AMS 6418
  • Boeing DMS-1841

Industry Trade Names:

  • UNS K32550

Common Applications:

  • Landing gear
  • Flap tracks

Macrostructure Limits:

Class Condition Severity
1 Freckles A
2 White Spots A
3 Radial Segregation B
4 Ring Pattern B
Rockwell-Industries-Hy-Tuf-VAR-ams-6425-image

Composition

Element Min. Max.
Carbon 0.23 0.28
Manganese 1.20 1.50
Silicon 1.30 1.70
Phosphorus 0.010
Sulfur 0.010
Chromium 0.20 0.40
Nickel 1.65 2.00
Molybdenum 0.35 0.45
Copper 0.35

Minimum Longitudinal Tensile Properties:

Property Value
Tensile Strength 220 ksi (1517 MPa)
Yield Strength at 0.2% Offset 185 ksi (1276 MPa)
Elongation in 4D 10%
Reduction of Area 30%

Average grain size requirement of ASTM No. 5 or finer in accordance with ASTM E112.