Carpenter Custom 455 Stainless Steel, Condition H1000 (Age Hardened 538C (1000F))


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, Brinell411411 Estimated from Rockwell C for 3000 kg load, 10 mm ball Brinell measurement.
Hardness, Knoop450450 Estimated from Rockwell C
Hardness, Rockwell C4444 
Hardness, Vickers430430 Estimated from Rockwell C
Tensile Strength, Ultimate1413 MPa205000 psi 
Tensile Strength, Ultimate at Elevated Temperature1062 MPa154000 psi 427C
Tensile Strength, Ultimate at Elevated Temperature1200 MPa174000 psi 316C
Tensile Strength, Ultimate at Elevated Temperature1517 MPa220000 psi -73C
Tensile Strength, Ultimate at Elevated Temperature1758 MPa255000 psi -184C
Tensile Strength, Ultimate at Elevated Temperature814 MPa118000 psi 538C
Tensile Strength, Yield1345 MPa195000 psi 0.2% Offset
Tensile Strength, Yield at Elevated Temperature1020 MPa148000 psi 0.2% Offset; 427C
Tensile Strength, Yield at Elevated Temperature138 MPa20000 psi 0.2% Offset; 316C
Tensile Strength, Yield at Elevated Temperature738 MPa107000 psi 0.2% Offset; 538C
Elongation at Break14 %14 % In 4D
Elongation at Break at Elevated Temperature13 %13 % -73C
Elongation at Break at Elevated Temperature13 %13 % -184C
Elongation at Break at Elevated Temperature14 %14 % In 4D; 316C
Elongation at Break at Elevated Temperature15 %15 % In 4D; 427C
Elongation at Break at Elevated Temperature20 %20 % In 4D; 538C
Reduction of Area45 %45 % -184C
Reduction of Area50 %50 % -73C
Reduction of Area55 %55 % 
Reduction of Area60 %60 % 316C
Reduction of Area65 %65 % 427C
Reduction of Area75 %75 % 538C
Modulus of Elasticity200 GPa29000 ksi 
Notched Tensile Strength1517 MPa220000 psi -184C
Notched Tensile Strength2000 MPa290000 psi 
Notched Tensile Strength2068 MPa300000 psi -73C
Poisson's Ratio0.30.3 
Charpy Impact16 J11.8 ft-lb V-notch; -73C
Charpy Impact30 J22.1 ft-lb V-notch
Charpy Impact5 J3.69 ft-lb V-notch; -184C
Fatigue Strength630 MPa91400 psi R.R. Moore Test, Smooth Rotating Beam, 1E+7 Cycles
Shear Modulus76.9 GPa11200 ksi Calculated

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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