Alloy 20 CB 3 Specification

  • W.NR 2.4660
  • UNS N08020
  • AWS 130

Applicable Standards:

  • -

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.

Good Mechanical Properties at Elevated Temperatures No
Corrosion Resistant at Ambient Temperatures Yes
Corrosion Resistant & Good Mechanical Properties at Elevated Temperatures No
Oxidation Resistant No
Precipitation Hardenable No

Applications include:

  • Chemical and allied industries
  • Processing of synthetic rubber
  • High-octane gasoline
  • Solvents
  • Pharmaceuticals
  • Agrichemicals
Approximate Chemical Composition
Ni 32 - 38%
Cr 19 - 21%
Cu 3 - 4%
Mo 2 - 3%
C 0.07% max
Fe BAL
Properties
DENSITY 8.08 g/cm3 0.292 lb/in3
MELTING POINT 1425 oC 2600 oF
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
CONDITION OF SUPPLY HEAT TREATMENT (AFTER FORMING)
Annealed / Spring Temper Stress relieve at 250 - 530ºC (480 - 990ºF) for 1 hour and air cool.
CONDITION APPROX TENSILE STRENGTH APPROX SERVICE TEMPERATURE
Annealed 600 - 900 N/mm2 87 - 131 ksi -200 to +300 oC -330 to +570 oF
Spring Temper 1200 - 1800 N/mm2 174 - 261 ksi -200 to +300 oC -330 to +570 oF
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