Alloy 20 Products -Pipes, Tubes, Flanges, Plates, Round bars, Pipe Fittings

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Alloy 20 - Alloy 20 Pipes, Alloy 20 Tubes, Alloy 20 Plates, Alloy 20 Round bars, Alloy 20 Pipe Fittings

 
 
 
 
 
 
 
 
 
 
 
 
 
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ALLOY 20 PRODUCTS

Other common names: Carpenter 20, 20Cb-3®, Incoloy® alloy 20

Alloy 20, also known as Carpenter 20, is a nickel-iron-chromium austenitic alloy that was developed for maximum resistance to acid attack, specifically sulfuric acid. This supperalloy has excellent resistance to general corrosion, pitting, and crevice corrosion in chemicals containing chlorides and sulfuric, phosphoric, and nitric acids. It also contains niobium for stabilization against sensitization and resultant intergranular corrosion. Carpenter 20 combines excellent corrosion resistance with elevated mechanical properties and relatively easy fabrication. Although originally designed for use in sulfuric acid related industries, Alloy 20 is now a popular choice for a wide variety of industries including the chemical, food, pharmaceutical, and plastics industries. In addition, this superalloy is used in heat exchangers, mixing tanks, metal cleaning and pickling equipment, and piping.

There has long been a debate on whether Carpenter 20 is a stainless steel or a nickel alloy because the nickel content is right on the border of defining it as one way or the other. So, depending on who you talk to this alloy may be referred to as alloy 20 Stainless Steel or as a nickel alloy. Either way it is still great for corrosion resistance.

Alloy 20 (20Cb-3) is an austenitic stainless steel which was designed for maximum resistance to acid attacks and as such has excellent resistance to hot sulfuric acid.  Alloy 20 is also resistant to intergranular corrosion in the as-welded condition. At 33% nickel, Alloy 20 has practical immunity to chloride stress corrosion cracking.  Alloy 20 is used is a wide variety of applications from Sulfuric acid pickling tanks, racks and heating coil, Heat Exchangers, Process piping, Chemical and petroleum process equipment etc.

Available forms is Alloy 20

  • Sheet
  • Plate
  • Bar
  • Pipe & Tube (welded & seamless)
  • Fittings (i.e. flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)
  • Wire

Alloy 20 Specifications 

Bar ASTM B 473
Plate ASME SB-463, ASME SB-464, ASTM B 463, ASTM B 464
Sheet ASME SB-463, ASME SB-464, ASTM B 463, ASTM B 464
Strip ASME SB-463, ASME SB-464, ASTM B 463, ASTM B 464
Wire ASME SB-473 ASME SB-366, ASTM B 473, ASTM B 366
Weld Wire AWS eR320LR
Other UNS N08020, Covered Electrodes AWS E320LR

Characteristics of Alloy 20

  • Excellent general corrosion resistance to sulfuric acid
  • Excellent resistance to chloride stress corrosion cracking
  • Excellent mechanical properties and fabricability
  • Minimal carbide precipitation during welding
  • Excels in resisting corrosion to hot sulfuric acids

Chemical Composition, %

Ni Fe Cr Cu Mo Nb
32.00-38.00 Balance 19.0-21.0 3.0-4.0 2.0-3.0 8xC-1.0max

C Mn P S Si
.07max 2.0max .045max .035max 1.0max

Applications of Alloy 20

  • Synthetic rubber manufacturing equipment
  • Processing of pharmaceuticals, plastics and organic and heavy chemicals
  • Tanks, piping, heat exchangers, pumps, valves, and other process equipment
  • Acid cleaning and pickling equipment
  • Chemical process piping, reactor vessels
  • Bubble caps
  • Petrochemical process equipment
  • Food and dye production

ASTM Specification

Pipe Smls Pipe Welded Tube Smls Tube Welded Sheet/Plate Bar Forging Fitting
B729 B464 B729 B468 B463 B473 B462 B366

Mechanical Properties
Annealed Material

Form Tensile Min. Yield Min. (.2% offset) Elongation Min. Reduction of Area Min.
Bar (hot or cold finished) 80 ksi 35 ksi 30% 50%
Sheet/Plate 80 ksi 35 ksi 30% -

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