Carpenter Custom 455® Stainless Steel, Condition H950 (Age Hardened 510°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	459	459	Estimated from Rockwell C for Brinell test with 3000 kg load, 10 mm ball.
Hardness, Knoop	504	504	Estimated from Rockwell C
Hardness, Rockwell C	48	48
Hardness, Vickers	482	482	Estimated from Rockwell C
Tensile Strength, Ultimate	1586 MPa	230000 psi
Tensile Strength, Ultimate at Elevated Temperature	1207 MPa	175000 psi	427°C
Tensile Strength, Ultimate at Elevated Temperature	1345 MPa	195000 psi	316°C
Tensile Strength, Ultimate at Elevated Temperature	1689 MPa	245000 psi	-73°C
Tensile Strength, Ultimate at Elevated Temperature	1931 MPa	280000 psi	-184°C
Tensile Strength, Ultimate at Elevated Temperature	896 MPa	130000 psi	538°C
Tensile Strength, Yield	1517 MPa	220000 psi	0.2% Offset
Tensile Strength, Yield at Elevated Temperature	1124 MPa	163000 psi	0.2% Offset; 427°C
Tensile Strength, Yield at Elevated Temperature	1276 MPa	185000 psi	0.2% Offset; 316°C
Tensile Strength, Yield at Elevated Temperature	758 MPa	110000 psi	0.2% Offset; 538°C
Elongation at Break	12 %	12 %	In 4D
Elongation at Break at Elevated Temperature	11 %	11 %	-73°C
Elongation at Break at Elevated Temperature	12 %	12 %	In 4D; 316°C
Elongation at Break at Elevated Temperature	14 %	14 %	In 4D; 427°C
Elongation at Break at Elevated Temperature	18 %	18 %	In 4D; 538°C
Elongation at Break at Elevated Temperature	5 %	5 %	-184°C
Reduction of Area	20 %	20 %	-184°C
Reduction of Area	45 %	45 %	-73°C
Reduction of Area	50 %	50 %	316°C
Reduction of Area	50 %	50 %
Reduction of Area	60 %	60 %	427°C
Reduction of Area	70 %	70 %	538°C
Modulus of Elasticity	200 GPa	29000 ksi	Room Temperature
Notched Tensile Strength	1931 MPa	280000 psi
Notched Tensile Strength	2068 MPa	300000 psi
Notched Tensile Strength	793 MPa	115000 psi
Poisson's Ratio	0.3	0.3	Room Temperature
Charpy Impact	14 J	10.3 ft-lb	V-Notch; -73°C
Charpy Impact	20 J	14.8 ft-lb	V-Notch
Charpy Impact	4 J	2.95 ft-lb	V-Notch; -184°C
Fatigue Strength	680 MPa	98600 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