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Alloy 20 CB 3

Alloy 20 CB 3

Available in any of the 'profile options'

Alloy 20 CB 3 is an austenitic stainless steel with excellent resistance to hot sulphuric acid and many other aggressive environments that would readily attack stainless steel 316. This alloy exhibits superior resistance to stress-corrosion cracking in boiling 20 to 40% sulphuric acid.

Chemical Composition Specifications Designations Key Features Typical Applications
Element Min % Max %
C - 0.06
Si - 1.00
Mn - 2.00
P - 0.035
S - 0.035
Cr 19.00 21.00
Mo 2.00 3.00
Ni 32.50 35.00
Cu 3.00 4.00
Nb 8 x C 1.00
Fe bal
ISO 15156-3
(NACE MR 0175)
W.Nr 2.4660
UNS N08020
AWS 130
Excellent resistance to hot sulphuric acid & many other aggressive environments that would attack ST/ST 316
Superior resistance to stress corrosion cracking in boiling 20 – 40% sulphuric acid
Chemical and allied industries
Processing of synthetic rubber
High-octane gasoline
Solvents
Pharmaceuticals
Agrichemicals
Density 8.08 g/cm³ 0.292 lb/in³
Melting Point 1425°C 2600°F
Coefficient of Expansion 14.69 μm/m °C (20 - 100°C) 8.16 x 10-6 in/in °F (70 - 212°F)
Modulus of Rigidity 73.6 kN/mm² 10675 ksi
Modulus of Elasticity 193 kN/mm² 27993 ksi
Heat Treatment of Finished Parts
Condition as supplied by Alloy Wire Type Temperature Time (Hr) Cooling
°C °F
Annealed or Spring Temper Stress Relieve 250 - 530 480 - 990 1 Air
Properties
Condition Approx. tensile strength Approx. operating temperature
N/mm² ksi °C °F
Annealed 600 - 900 87 - 131 -200 to +300 -330 to +570
Spring Temper 1200 - 1800 174 - 261 -200 to +300 -330 to +570

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