Carpenter Custom 455 Stainless Steel, Condition H950 (Age Hardened 510C)


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

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

Component   Wt. %
CMax 0.05 
Cr11 - 12.5 
Cu1.5 - 2.5 
Fe75 
MnMax 0.5 
Component   Wt. %
MoMax 0.5 
NbMax 0.5 
Nb + Ta0.1 - 0.5 
Ni7.5 - 9.5 
PMax 0.04 
Component   Wt. %
SMax 0.03 
SiMax 0.5 
TaMax 0.5 
Ti0.8 - 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 PropertiesMetricEnglishComments
Density7.76 g/cc0.28 lb/in 

Mechanical Properties
Hardness, Brinell459459 Estimated from Rockwell C for Brinell test with 3000 kg load, 10 mm ball.
Hardness, Knoop504504 Estimated from Rockwell C
Hardness, Rockwell C4848 
Hardness, Vickers482482 Estimated from Rockwell C
Tensile Strength, Ultimate1586 MPa230000 psi 
Tensile Strength, Ultimate at Elevated Temperature1207 MPa175000 psi 427C
Tensile Strength, Ultimate at Elevated Temperature1345 MPa195000 psi 316C
Tensile Strength, Ultimate at Elevated Temperature1689 MPa245000 psi -73C
Tensile Strength, Ultimate at Elevated Temperature1931 MPa280000 psi -184C
Tensile Strength, Ultimate at Elevated Temperature896 MPa130000 psi 538C
Tensile Strength, Yield1517 MPa220000 psi 0.2% Offset
Tensile Strength, Yield at Elevated Temperature1124 MPa163000 psi 0.2% Offset; 427C
Tensile Strength, Yield at Elevated Temperature1276 MPa185000 psi 0.2% Offset; 316C
Tensile Strength, Yield at Elevated Temperature758 MPa110000 psi 0.2% Offset; 538C
Elongation at Break12 %12 % In 4D
Elongation at Break at Elevated Temperature11 %11 % -73C
Elongation at Break at Elevated Temperature12 %12 % In 4D; 316C
Elongation at Break at Elevated Temperature14 %14 % In 4D; 427C
Elongation at Break at Elevated Temperature18 %18 % In 4D; 538C
Elongation at Break at Elevated Temperature5 %5 % -184C
Reduction of Area20 %20 % -184C
Reduction of Area45 %45 % -73C
Reduction of Area50 %50 % 316C
Reduction of Area50 %50 % 
Reduction of Area60 %60 % 427C
Reduction of Area70 %70 % 538C
Modulus of Elasticity200 GPa29000 ksi Room Temperature
Notched Tensile Strength1931 MPa280000 psi 
Notched Tensile Strength2068 MPa300000 psi 
Notched Tensile Strength793 MPa115000 psi 
Poisson's Ratio0.30.3 Room Temperature
Charpy Impact14 J10.3 ft-lb V-Notch; -73C
Charpy Impact20 J14.8 ft-lb V-Notch
Charpy Impact4 J2.95 ft-lb V-Notch; -184C
Fatigue Strength680 MPa98600 psi R.R. Moore Test, Smooth Rotating Beam, 1E+7 Cycles
Shear Modulus76.9 GPa11200 ksi Calculated; Room Temp.

Electrical Properties
Electrical Resistivity7.58e-005 ohm-cm7.58e-005 ohm-cm Condition H950 at Room Temp.

Thermal Properties
CTE, linear 20C10.6 m/m-C5.89 in/in-F 22-93C
CTE, linear 250C11.2 m/m-C6.22 in/in-F 22-260C
CTE, linear 500C12 m/m-C6.67 in/in-F 22-482C


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