Hy-Tuf VAR AMS 6425

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

Common stock sizes: 1.500”dia to 3.500” diameters.

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

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.