Carpenter 20/CB3

Do you need custom fasteners created with Carpenter™ 20/CB3? Since our inception, Elgin Fastener Group 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. %
C Max 0.06
Cr 19 – 21
Cu 3 – 4
Fe 36
Mn Max 2
Mo 2 – 3
Nb Max 1
Nb + Ta Max 1
Ni 32.5 – 35
P Max 0.035
S Max 0.035
Si Max 1
Ta Max 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 Properties Metric English Comments
Density 8.08 g/cc 0.292 lb/in³
Mechanical Properties
Tensile Strength, Ultimate 627 MPa 90900 psi
Tensile Strength, Yield 331 MPa 48000 psi 0.2% Offset
Elongation at Break 45 % 45 % In 50 mm
Reduction of Area 67 % 67 %
Modulus of Elasticity 193 GPa 28000 ksi In Tension
Poisson’s Ratio 0.31 0.31
Fatigue Strength 330 MPa 47900 psi R.R. Moore Test, Smooth Rotating Beam, 1E+7 Cycles
Shear Modulus 73.7 GPa 10700 ksi Calculated
Electrical Properties
Electrical Resistivity 0.0001082 ohm-cm 0.0001082 ohm-cm
Magnetic Permeability 1.002 1.002
Thermal Properties
CTE, linear 20°C 14.69 µm/m-°C 8.16 µin/in-°F 25-100ºC
CTE, linear 250°C 15.91 µm/m-°C 8.84 µin/in-°F 25-450ºC
CTE, linear 500°C 15.91 µm/m-°C 8.84 µin/in-°F 25-450ºC
CTE, linear 1000°C 17.15 µm/m-°C 9.53 µin/in-°F 25-900ºC
Heat Capacity 0.5 J/g-°C 0.12 BTU/lb-°F