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Material Specification

Alloy 20

Alloy 20 Fasteners
Niobium-Stabilized High-Nickel Austenitic Alloy (UNS N08020 / 2.4660 / 20 Cb-3)

High Moly Stainless Steel Alloy 20 Fasteners

Buy Alloy 20 (UNS N08020 / DIN EN 2.4660 / Carpenter 20 Cb-3®) bolts, studs, nuts, and corrosion-resistant fasteners from Exotic Alloy, conforming to ASTM B473, ASTM B462, ASTM A182, and NACE MR0175. Alloy 20 is an austenitic nickel-iron-chromium alloy fortified with 35% nickel, 20% chromium, 2.5% molybdenum, 3.5% copper, and niobium stabilization, specifically formulated for exceptional resistance to sulfuric acid attack.

Exotic Alloy manufactures Alloy 20 heavy hex bolts, socket cap screws, all-thread stud bolts, and custom drawing components. Its unique chemical balance prevents intergranular corrosion during welding while offering total resistance to chloride stress corrosion cracking in aggressive chemical and pickling environments.

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Alloy 20 Bolting Products

Alloy 20 Specifications & Standards

  • ASTM B473 / B462 / A182
  • UNS N08020 / Alloy 20
  • NACE MR0175 / ISO 15156
  • DIN EN 2.4660 (NiCr20CuMo)
  • Carpenter 20 Cb-3®
  • ASME SB-473 / ISO 3506
Alloy 20 Material Datasheet

Alloy 20 Properties

Chemical Composition (Alloy 20)
Elements C Mn P S Si Cr Ni Mo Cu Nb+Ta Fe
Min % - - - - - 19.00 32.00 2.00 3.00 8*C Balance
Max % 0.07 2.00 0.045 0.035 1.00 21.00 38.00 3.00 4.00 1.00 Balance
Mechanical Properties (Alloy 20)
Condition / Heat Treatment Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness
Solution Annealed (Bar / Fasteners) 550 - 750 240 30 % 160 - 210 HB

Alloy 20 Characteristics

  • Benchmark resistance to sulfuric acid attack across a wide spectrum of temperatures and concentrations.
  • Niobium stabilization eliminates chromium carbide precipitation during welding.
  • High 35% nickel content imparts near-immunity to chloride stress corrosion cracking.
  • Excellent resistance to boiling nitric, phosphoric, and organic acid solutions.
  • Good machinability and ease of fabrication for complex bolting geometries.

Applications

  • Sulfuric acid pickling tanks, heating coils, and acid pump hardware.
  • Chemical and petrochemical process valves, pumps, and piping fasteners.
  • Synthetic rubber, plastics, and petrochemical processing reactors.
  • Pharmaceutical, dye, and food acid processing equipment.
  • Explosives and fertilizer manufacturing infrastructure.