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


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, Brinell472472 Estimated from Rockwell C for Brinell test with 3000 kg load, 10 mm ball.
Hardness, Knoop519519 Estimated from Rockwell C
Hardness, Rockwell C4949 
Hardness, Vickers496496 Estimated from Rockwell C
Tensile Strength, Ultimate1689 MPa245000 psi 
Tensile Strength, Ultimate at Elevated Temperature1241 MPa180000 psi 427C
Tensile Strength, Ultimate at Elevated Temperature1345 MPa195000 psi 371C
Tensile Strength, Ultimate at Elevated Temperature1407 MPa204000 psi 316C
Tensile Strength, Ultimate at Elevated Temperature1476 MPa214000 psi 260C
Tensile Strength, Yield1634 MPa237000 psi 0.2% Offset
Tensile Strength, Yield at Elevated Temperature1145 MPa166000 psi 0.2% Offset; 427C
Tensile Strength, Yield at Elevated Temperature1241 MPa180000 psi 0.2% Offset; 371C
Tensile Strength, Yield at Elevated Temperature1296 MPa188000 psi 0.2% Offset; 316C
Tensile Strength, Yield at Elevated Temperature1372 MPa199000 psi 0.2% Offset; 260C
Elongation at Break11 %11 % In 4D
Elongation at Break at Elevated Temperature10 %10 % In 4D; 260C
Elongation at Break at Elevated Temperature12 %12 % In 4D; 371C
Elongation at Break at Elevated Temperature14 %14 % In 4D; 427C
Reduction of Area48 %48 % 
Reduction of Area49 %49 % 260C
Reduction of Area50 %50 % 316C
Reduction of Area52 %52 % 371C
Reduction of Area56 %56 % 427C
Modulus of Elasticity200 GPa29000 ksi 
Poisson's Ratio0.30.3 Room Temperature
Charpy Impact12 J8.85 ft-lb 25 mm bar
Fatigue Strength772 MPa112000 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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