455

455

455 is a martensitic age-hardenable stainless steel with high strength and good corrosion resistance to atmospheric environments. This alloy is easily formable in the annealed condition. A single step aging treatment develops exceptionally high yield strength with good ductility and toughness. 455 can be machined in the annealed condition and welded in similar ways as other precipitation hardenabe stainless steels.

Chemistry

 CrNiCuMoMnTiSiCb + TaSPCFe
MIN 11.0 7.50 1.50 - - 0.80 - 0.10 - - - -
MAX 12.5 9.50 2.50 0.50 0.50 1.40 0.50 0.50 0.30 0.04 0.05 balance

Specifications

AMS 5617
ASME SA 564
ASTM F 899
BOEING HMS 6 1093
UNS S45500

Inventory

455 Round Bar

Common Trade Names

Custom 455

Features

  • Excellent oxidation resistance to 1100°F
  • Exceptionally high strength and good ductility
  • Good corrosion to atmospheric environments
  • Ease of fabrication

Applications

  • Medical instruments
  • Small turbine engine shafts
  • Extruder screws

Physical Properties

Density: 0.280 lb/inch3
Specific Gravity: 7.76
Poisson's Ratio: 0.30
Electrical Resistivity at 70°F: 545 ohm - circ mil/ft

Temperature,°F 70 200 300 500 700 900
Coefficient of Thermal Expansion*, in/in°F x 10-6 -- 5.9 6.03 6.2 6.45 6.68
Temperature,°F 70 212 392 572 752 932
Thermal Conductivity, BTU • ft/ft2 • hr • °F -- 125.0 137.0 148.0 162.0 172.0

* 70°F to indicated temperature.

Mechanical Properties

Typical Room Temperature Tensile Properties

Condition A H 950 H 1000 H 1050
Ultimate Tensile Strength, ksi 140 230 205 190
0.2% Yield Strength, ksi 115 220 195 175
Elongation in 4D, % 12 10 12 14
Reduction of Area, % 50 45 45 50
Charpy V-Notch, ft-lb -- 8 12 25
Rockwell C 31 48 45 40

Typical Elevated Temperature Tensile Properties, Condition H 1000

Temperature, °F 70 600 800 1000
Ultimate Tensile Strength, ksi 205 174 154 118
0.2% Yield Strength, ksi 195 165 148 110
Elongation in 4D, % 14 14 15 20
Reduction of Area, % 55 60 65 75
Rockwell C 44 44 44 44

Typical Elevated Temperature Tensile Properties, Condition H 950

Temperature, °F 70 600 800 1000
Ultimate Tensile Strength, ksi 230 195 175 130
0.2% Yield Strength, ksi 220 185 163 110
Elongation in 4D, % 12 12 14 18
Reduction of Area, % 50 50 60 70
Rockwell C 48 48 48 48

Typical Elevated Temperature Tensile Properties, Condition H 900

Temperature, °F 70 500 600 700 800
Ultimate Tensile Strength, ksi 245 214 204 195 180
0.2% Yield Strength, ksi 237 199 188 180 166
Elongation in 4D, % 11 10 11 12 14
Reduction of Area, % 48 49 50 52 56
Rockwell C 49 49 49 49 49