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Carpenter™ 20/CB3 Material Property Data Sheet

Do you need custom fasteners created with Carpenter™ 20/CB3? Since our inception, Vegas Fastener Manufacturing has met every challenge of providing Quality, Timely, Cost-effective solutions for specialty fastener applications. Every product is built to your specifications, using your prints if necessary.

Below are the technical specifications of the Carpenter™ 20/CB3 Bar Stock we have available to meet your needs.


Carpenter 20Cb-3® Stainless Steel, Bar

Subcategory: Metal; Stainless Steel; T 300 Series Stainless Steel

Key Words: ASTM B472; ASTM B473; ASTM B474ASTM B471; ASTM B472; ASTM B473; ASTM B474; ASTM B475; ASTM B729, Carpenter Technology Corporation, Carpenter Steel Division; Cartech, UNS N08020; NACE MR0175; ASTM A265; ASTM B366; ASTM B462; ASTM B463; ASTM B464; ASTM B468; ASTM B471

Component   Wt. %
CMax 0.06 
Cr19 - 21 
Cu3 - 4 
MnMax 2 
Component   Wt. %
Mo2 - 3 
NbMax 1 
Nb + TaMax 1 
Ni32.5 - 35 
PMax 0.035 
SMax 0.035 
SiMax 1 
TaMax 1 

Material Notes:
Iron content calculated as remainder; minimum niobium (columbium) content 8 x C. Data provided by Carpenter Technology Corporation.

20Cb-3 ® is an austenitic stainless steel possessing excellent resistance to hot sulfuric acid and many other aggressive environments which would readily attack Type 316 stainless. This alloy exhibits superior resistance to stress-corrosion cracking in boiling 20 to 40% sulfuric acid. 20Cb-3 stainless is also stabilized to limit intergranular attack, even in the sensitized condition. Corrosion tests on annealed and sensitized material conducted in the Ferric Sulfate - 50% Sulfuric Acid Test resulted in rates of 0.002 inches per month maximum. Important advantages of 20Cb-3 stainless are its excellent mechanical properties and comparative ease of fabrication. The presence of columbium in the alloy minimizes the precipitation of carbides during welding. Assemblies usually have been placed in service in the as-welded condition.

This material has found wide use in all phases of the chemical and allied industries. It has been used extensively in the processing of synthetic rubber, high-octane gasoline, solvents, explosives, plastics, synthetic fibers, heavy chemicals, organic chemicals, pharmaceuticals, and agrichemicals. 20Cb-3 stainless has also been used in SO2 scrubbers where acid content, such as sulfuric acid, is of more concern than high-halogen content, such as chlorides. Other applications have included use in fans, mixing tanks, agitators, distillation towers, heat exchangers, process piping, bubble caps, metal cleaning and pickling tanks, spray pickling equipment, pump shafts and rods, valve stems, bolts, nuts, washers, tie rods, continuous-line pickling equipment including racks, etc.

20Cb-3® is a registered trademark of Carpenter Technology Corporation.

Physical PropertiesMetricEnglishComments
Density8.08 g/cc0.292 lb/inł 

Mechanical Properties
Tensile Strength, Ultimate627 MPa90900 psi 
Tensile Strength, Yield331 MPa48000 psi 0.2% Offset
Elongation at Break45 %45 % In 50 mm
Reduction of Area67 %67 % 
Modulus of Elasticity193 GPa28000 ksi In Tension
Poisson's Ratio0.310.31 
Fatigue Strength330 MPa47900 psi R.R. Moore Test, Smooth Rotating Beam, 1E+7 Cycles
Shear Modulus73.7 GPa10700 ksi Calculated

Electrical Properties
Electrical Resistivity0.0001082 ohm-cm0.0001082 ohm-cm 
Magnetic Permeability1.0021.002 

Thermal Properties
CTE, linear 20°C14.69 µm/m-°C8.16 µin/in-°F 25-100şC
CTE, linear 250°C15.91 µm/m-°C8.84 µin/in-°F 25-450şC
CTE, linear 500°C15.91 µm/m-°C8.84 µin/in-°F 25-450şC
CTE, linear 1000°C17.15 µm/m-°C9.53 µin/in-°F 25-900şC
Heat Capacity0.5 J/g-°C0.12 BTU/lb-°F 


 This information is provided by MatWeb.com, The Online Materials Database and is reprinted with their permission.

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