Carpenter 20

Carpenter 20

Nickel (Ni) - 35 Median
(32.0 Min - 38.0 Max)
Copper (Cu) - 3.5 Median
(3.0 Min - 4.0 Max)
Chromium (Cr) - 20 Median
(19.0 Min - 21.0 Max)
Molybdenum (Mo) - 2.5 Median
(2.0 Min - 3.0 Max)
Iron (Fe) - 34.85 Balance
Manganese (Mn) - 2 Max
Silicon (Si) - 1 Max
Niobium + Tantalum (Nb+Ta) - 1 Max
Other

Key

Nickel
Copper
Chromium
Aluminum
Molybdenum
Iron
Titanium
Manganese
Cobalt
Other
  • Nickel (Ni) 35 Median
    (32.0 Min - 38.0 Max)
  • Copper (Cu) 3.5 Median
    (3.0 Min - 4.0 Max)
  • Chromium (Cr) 20 Median
    (19.0 Min - 21.0 Max)
  • Molybdenum (Mo) 2.5 Median
    (2.0 Min - 3.0 Max)
  • Iron (Fe) 34.85 Balance
  • Manganese (Mn) 2 Max
  • Carbon (C) .07 Max
  • Silicon (Si) 1 Max
  • Phosphorus (P) .045 Max
  • Sulfur (S) .035 Max
  • Niobium + Tantalum (Nb+Ta) 1 Max

UNS N08020, 20CB-3

Alloy 20, also known as “Carpenter 20” and “20CB-3”, was developed by Carpenter Technology as an upgrade to 316 Stainless. It is classified as a super-austenitic due to iron being its most abundant component. The UNS system classifies it as nickel-based alloy even though its nickel content is less than half. Alloy 20 resists hot sulfuric acid. It is often found in chemical mixers and fertilizer manufacturing equipment. Generally, it is an economical alternative to Alloy C276 and other higher nickel content materials.

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Summary

  • Environment:
    Moderately Corrosive: Acids & Chemicals
  • Temperature Limit:
    1000 °F / 538 °C
  • Ultimate Tensile (Typical):
    90 ksi / 620 mpa

Specifications & Technical Data

If your question isn’t answered below, download the technical data sheet here.

Specifications

  • Plate & Sheet: ASTM B463, ASME SB463
  • Bar: ASTM B473, ASME SB473
  • Seamless Pipe & Tube: ASTM B729, ASME SB729

Physical Properties

Density lb/in3 0.292
g/cm 8.08
Shear Modulus 103 ksi 11
GPa 76
Young’s Modulus 103 ksi 28
GPa 193
Specific Heat Btu/lb•°F 0.12
J/kg•°C 500
Electrical Resistivity ohm•circ mil/ft 651
µΩ•m 1.08
Thermal Conductivity Btu•in/ft2 •h•°F 85
W/m•°C 12.3
Coefficient of Expansion 77-212°F, 10-6 in/in•°F 8.2
25-100°C, µm/m•°C 14.7

Mechanical Properties

Typical Room Temperature Mechanical Properties
Tensile Strength ksi 90
MPa 620
Yield Strength (0.2% Offset) ksi 45
MPa 300
Elongation, % 40

 

Room Temperature Tensile Test Results of Cold Worked INCOLOYalloy 020
Cold Reduction Yield Strength (0.2% Offset) Tensile Strength Elongation Hardness
% ksi MPa ksi MPa % Rockwell
0* 44.4 306 95.8 661 38 B83
20 111.0 765 119.8 826 13 C23
30 124.3 857 131.5 907 8 C28
40 127.5 879 135.0 931 7 C27
50 139.5 962 147.5 1017 4 C30
60 139.9 965 149.3 1029 5 C31

*Stabilize anneal

High-temperature Mechanical Properties

Alloy 20 High Temperature Mechanical Properties

Corrosion Resistance

Sulfuric Acid Corrosion Data for Strip*
Temperature H2SO4, % Corrosion Rate
°C °F % mpy mm/a
50 122 70 2 0.051
60 140 20 0 0.000
60 140 70 3 0.076
60 140 90 4 0.102
75 167 70 5 0.127
85 185 20 18 0.457
85 185 70 7 0.178
85 185 90 15 0.381
95 203 90 27 0.686
Boiling 20 17 0.432

 

Joining

Recommended Welding Products
Shielded Metal Arc Welding Gus Tungsten Arc Welding, Gas Metal Arc Welding
INCONEL welding electrode 112 INCONEL filler metal 625
INCONEL welding electrode 122 INCONEL filler metal 622
INCO-WELD welding electrode 686CPT® INCO-WELD filler metal 686CPT®

Heat Treatments

Hot forming should be in the range 1400-2150°F (7601175°C). INCOLOY alloy 020 is normally used in the annealed condition. Annealing: 1800-1850°F (9821010°C)/ for a time commensurate with section size/AC.

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Industries We Serve

Nickel Systems provides high quality exotic grade materials that hold up in the toughest, most severe heat and corrosive environments. With our large inventory of specialty fasteners in stock, we are always ready to answer the call to serve the most challenging applications.

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