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Alloy 20 Plates


Alloy 20 plates or alloy 20 was designed in particular to face up to sulfuric acid. Its nickel, chromium, molybdenum and copper tiers all offer remarkable trendy corrosion resistance. Confined carbon plus columbium stabilization allows welded fabrications for use in corrosive environments, typically without put up-weld heat treatment. At 33% nickel, alloy 20 has practical immunity to chloride strain corrosion cracking. This alloy is often selected to solve SCC issues, which might also arise with 316L stainless.

Chemistry

  Ni Cr Mo Mn Cu Si C S P Cb+Ta Fe
MIN 32.5 19.0 2.0 - 3.0 - - - - 8.0 x C 1.0 -
MAX 35.0 21.0 3.0 2.0 4.0 1.0 0.06 0.035 0.035 - Balance

Specifications

o ASME SA 240, ASME SB 366, ASME SB 463
o ASTM A 240, ASTM B 366
o ASTM B 463
o ASTM B 473
o EN 2.4660
o UNS N08020
o Werkstoff 2.4660

Inventory

Alloy 20 Coil, Alloy 20 Plate, Alloy 20 Sheet, Alloy 20 Weld Wire Supplier and exporters.

Common Trade Names

Carpenter® 20, 20CB-3®

Features

• Excellent resistance to hot sulfuric acid
• Resistant to intergranular corrosion in the as-welded condition
• Chloride stress corrosion cracking resistance

Applications

• Sulfuric acid pickling tanks, racks and heating coils
• Phosphate coating drums and racks
• Heat exchangers
• Bubble caps
• Process piping
• Mixing tanks
• Chemical and petroleum process equipment

Physical Properties

Density: 0.278 lb/in3 annealed
Melting Point: 2525-2630°F
Electrical Resistivity: 651 Ohm-circ mil/ft

Temperature, °F 70 212 392 572 752 842 932
Coefficient* of Thermal Expansion, in/in°F x 10-6 - 8.16 8.37 8.62 8.62 8.84 8.91
Thermal Conductivity
Btu • ft/ft2 • hr • °F
6.7 7.57 8.56 9.53 10.5 - -
Modulus of Elasticity, Dynamic psi x 106 28 - - - - - -
* 70°F to indicated temperature

Mechanical Properties

Minimum Specified Properties, Asme Sb-688 Plate

Ultimate tensile strength, ksi 80
0.2% yield strength, ksi 35
Elongation, % 30
Hardness MAX, Brinell 217

Typical Tensile Properties, Bar

Temperature, °F 70
Ultimate Tensile Strength, ksi 91
0.2% Yield Strength, ksi 48
Elongation, % 45
Charpy Impact V-notch, ft-lbs 200
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