Carpenter Custom 455® Stainless Steel, Condition H900 (Age Hardened 482°C)

Subcategory: Ferrous Metal; Metal; Stainless Steel; T 400 Series Stainless Steel

Key Words: UNS S45500; Carpenter Technology Corporation, Carpenter Steel Division; Cartech

Component    Wt. % C Max 0.05   Cr 11 - 12.5   Cu 1.5 - 2.5   Fe 75   Mn Max 0.5

Component    Wt. % Mo Max 0.5   Nb Max 0.5   Nb + Ta 0.1 - 0.5   Ni 7.5 - 9.5   P Max 0.04

Component    Wt. % S Max 0.03   Si Max 0.5   Ta Max 0.5   Ti 0.8 - 1.4

Material Notes:
Iron content calculated as remainder. Data provided by Carpenter Technology Corporation.

Recognizing the need for high-strength alloys with good corrosion resistance to atmospheric environments, the Carpenter Research Laboratory developed Custom 455® stainless, a martensitic age-hardenable stainless steel. This alloy is relatively soft and formable in the annealed condition. A single-step aging treatment develops exceptionally high yield strength with good ductility and toughness. This stainless can be machined in the annealed condition, and welded in much the same manner as other precipitation hardenable stainless steels. Because of its low work-hardening rate, it can be extensively cold formed. The dimensional change during hardening is only about -0.001 in/in, which permits close-tolerance finish machining in the annealed state. Custom 455 stainless represents a significant advancement in the area of precipitation hardening stainless steels. It should be considered where simplicity of heat treatment, ease of fabrication, high strength and corrosion resistance are required in combination.

Because of the unique combination of high strength and corrosion resistance of Custom 455 stainless there are few other alloys available for consideration. Carpenter PH13-8 Mo can be considered where good transverse toughness and ductility are necessary in large sections.

Custom 455® is a registered trademark of Carpenter Technology Corporation.

Physical Properties	Metric	English	Comments
Density	7.76 g/cc	0.28 lb/in³
Mechanical Properties
Hardness, Brinell	472	472	Estimated from Rockwell C for Brinell test with 3000 kg load, 10 mm ball.
Hardness, Knoop	519	519	Estimated from Rockwell C
Hardness, Rockwell C	49	49
Hardness, Vickers	496	496	Estimated from Rockwell C
Tensile Strength, Ultimate	1689 MPa	245000 psi
Tensile Strength, Ultimate at Elevated Temperature	1241 MPa	180000 psi	427°C
Tensile Strength, Ultimate at Elevated Temperature	1345 MPa	195000 psi	371°C
Tensile Strength, Ultimate at Elevated Temperature	1407 MPa	204000 psi	316°C
Tensile Strength, Ultimate at Elevated Temperature	1476 MPa	214000 psi	260°C
Tensile Strength, Yield	1634 MPa	237000 psi	0.2% Offset
Tensile Strength, Yield at Elevated Temperature	1145 MPa	166000 psi	0.2% Offset; 427°C
Tensile Strength, Yield at Elevated Temperature	1241 MPa	180000 psi	0.2% Offset; 371°C
Tensile Strength, Yield at Elevated Temperature	1296 MPa	188000 psi	0.2% Offset; 316°C
Tensile Strength, Yield at Elevated Temperature	1372 MPa	199000 psi	0.2% Offset; 260°C
Elongation at Break	11 %	11 %	In 4D
Elongation at Break at Elevated Temperature	10 %	10 %	In 4D; 260°C
Elongation at Break at Elevated Temperature	12 %	12 %	In 4D; 371°C
Elongation at Break at Elevated Temperature	14 %	14 %	In 4D; 427°C
Reduction of Area	48 %	48 %
Reduction of Area	49 %	49 %	260°C
Reduction of Area	50 %	50 %	316°C
Reduction of Area	52 %	52 %	371°C
Reduction of Area	56 %	56 %	427°C
Modulus of Elasticity	200 GPa	29000 ksi
Poisson's Ratio	0.3	0.3	Room Temperature
Charpy Impact	12 J	8.85 ft-lb	25 mm bar
Fatigue Strength	772 MPa	112000 psi	R.R. Moore Test, Smooth Rotating Beam, 1E+7 Cycles
Shear Modulus	76.9 GPa	11200 ksi	Calculated; Room Temp.
Electrical Properties
Electrical Resistivity	7.58e-005 ohm-cm	7.58e-005 ohm-cm	Condition H950 at Room Temp.
Thermal Properties
CTE, linear 20°C	10.6 µm/m-°C	5.89 µin/in-°F	22-93ºC
CTE, linear 250°C	11.2 µm/m-°C	6.22 µin/in-°F	22-260ºC
CTE, linear 500°C	12 µm/m-°C	6.67 µin/in-°F	22-482ºC