Carpenter 20 CB-3® Stainless Steel UNS N08020

Alloy 20 CB-3® is an austenitic stainless steel possessing excellent resistance to attack by sulfuric acid and many other aggressive environments.

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Shaped, Flat, Square, Round, Fine Wire, Plated and Bare Wire ASTM A240, ASTM A265, ASTM B 463, ASTM B471, ASTM B 472, ASTM B 473, ASTM B475

Alloy 20 CB-3® Alloy Description

Alloy 20 CB-3® is an austenitic stainless steel possessing excellent resistance to attack by sulfuric acid and many other aggressive environments. Alloy 20 CB-3 stainless is also stabilizes to limit inter-granular attack, even in the sensitized condition. Important advantages of alloy 20 CB-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.


Components for processing synthetic rubber processing
Components for processing gasoline,
synthetic fibers,
chemicals Food and dye production
Components for processing pharmaceutical

Chemistry Typical

Carbon: 0.070 max
Manganese: 2.00 max
Copper: 3.00-4.00
Chromium: 19.00-21.00
Nickel: 32.50-38.00
Molybdenum: 2.00-3.00
Sulfur: 1.00 max
Columbium +Tantalum: 8 x C min-1.00 max
Phosphorus: 0.035 max
Iron: Balance

Physical Properties

Density, 0.292 lbs/in³, 9.01 g/cm³

Electrical Resistivity: microhm-in, (microhm-cm): 68°F (20°C): 28.4 (72)

Specific Heat: BTU/lb/°F (kJ/kg•K):
32-212°F (0-100°C): 0.12 (0.50)

Thermal Conductivity: BTU/hr/ft²/ft/°F (W/m•K):
At 212°F: 7.57 at 752°F: 10.5

Mean Coefficient of Thermal Expansion: in/in/°F
77-212°F: 8.16 x 10
77-600°F: 8.84 x 10
77-1652°F: 9.53x 10

Modulus of Elasticity: KSI (MPa) 29.0 x 10³ (200 x 10³) in tension 11.0 x 10³ (0.78 x 10³) in torsion

Magnetic Permeability:=200: Annealed < 1.02

Mechanical Properties at Room Temperature

Properties: Annealed

Ultimate Tensile Strength: 80 KSI min (551 MPa min)
Yield Strength (0.2% offset): 35 KSI min (241 MPa min)
Elongation: 30% min (gauges: >0 .015 inches)
Hardness: Rb 95 max < strong>Properties: Tempered

Alloy 20 CB-3 can be cold rolled to achieve the temper properties required by specific
customers and/or manufacturing requirements. Contact Ulbrich Wire for details.

Additional Properties

Corrosion Resistance

Refer to NACE (National Association of Corrosion Engineers) for recommendations.

Standard Wire Finishes

Extra Clean: (XC) Extra clean is also referred to as “bright annealed” or “bright annealed and cold rolled”
Grease (round wire only): Drawn in a heavy grease produces an “Ultra bright” finish for
decorative applications
Soap (round wire only): Soap is used as a lubricant in the drawing process and is not
removed. It acts as a lubricant during customer part forming operation. A soap finish is
available in tempered products. Plated: Many plating options are available.
∗Special finishes are available: Contact Ulbrich Wire Sales with special finish and plating requests.
Forms Continuous Coils
Cut to lengths
Precision cutting

Cold Forming

Alloy 20 CB-3® stainless steel can be readily blanked, deep drawn, formed and upset

Heat Treatment

Alloy 20 CB-3® is not hardenable by heat treatment


For best results refer to: SSINA’s “Welding of Stainless Steels and Other Joining

Carpenter 20 CB-3® is a registered trademark of Carpenter Technologies Limitation of
Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels and Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the ‘applications’ noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document

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