Carpenter ® 20Cb-3, Alloy 20

Carpenter ® 20Cb-3, Alloy 20 was developed to offer excellent resistance to acid attack, in particular sulphuric acid. Alloy 20 has excellent resistance to pitting and crevice corrosion. Carpenter 20Cb-3 Alloy 20 also combines good corrosion resistance with relatively easy fabrication.

West Special Fasteners are manufacturers of Carpenter 20Cb-3, Alloy 20 Fasteners.

Carpenter 20Cb-3, Alloy 20 Fasteners such as Socket Setscrews, Socket Countersunk Screws, Socket Capscrews, Nuts, Bolts, Washers, Studs, Studbolts & machined components to drawings can all be produced at West Special Fasteners Limited.

Carpenter 20Cb-3, Alloy 20 was originally designed for use in industries relating to sulphuric acid. However, it has since been used regularly in a number of applications, including plastics, food, pharmaceuticals and chemical industries. In addition, Alloy 20 is used in metal cleaning and pickling equipment, heat exchangers and mixing tanks.

West Special Fasteners specialises in exotic metals and have supplied major UK companies with Carpenter 20Cb-3 Alloy 20 nuts, bolts etc.

We look forward to helping with your Carpenter 20Cb-3 Alloy 20 requirements and would welcome any enquiries by telephone on + 44 (0)1246 291111 or email

Typical Chemical Analysis

C Si Mn P S Cr Ni Mo
0.070 1.000 2.000 0.045 0.035 19.0-21.0 32.0-38.0 2.00-3.00
W N2 Nb Ti Co Cu Al B
V Fe Mg Ta Nb + Ta Ca O2 Bi
Balance 8xC Min 1% Max
Se Sn Zn Pb

Typical Mechanical Properties

Tensile Strength: 551N/mm² Min Impacts:
0.2% Proof Stress: 241N/mm² Min
Elongation: 30% Min Stress Rupture:
Reduction of Area: 50% Min
Other Remarks: Cold Finished Bar Require only 15% Minimum Elongation