Alloy 20


Alloy 20

Catering to the needs of the clients, we provide Alloy 20. Also known as Carpenter 20, Alloy 20 is a nickel-iron-chromium austenitic alloy that was developed for maximum resistance to acid attack, specifically sulfuric acid. Alloy 20 has excellent resistance to general corrosion, pitting, and crevice corrosion in chemicals containing chlorides and sulfuric, phosphoric, and nitric acids. With its excellent properties, the Alloy 20 has been widely demanded in the market. With its excellent reliability, the cost-effectiveness of the Alloy 20 acts as an add-on for the clients.

Product Overview
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 superalloy 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.

Forms
  • 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

Characteristics
  • 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

Applications
  • 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


Chemical Composition( %)

Ni 32.00-38.00
Fe Balance
Cr 19.0-21.0
Cu 3.0-4.0
Mo 2.0-3.0
Nb 8xC-1.0max
C .07max
Mn 2.0max
P .045max
S .035max
Si 1.0max

ASTM Specifications

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

Mechanical Properties Specified Tensile Properties ASTM A240

FormBar (hot or cold finished)Sheet/Plate
Tensile Min.80 ksi80 ksi
Yield Min. (.2% offset)35 ksi35 ksi
Elongation Min.30.00%30.00%
Reduction of Area Min.50.00%

Mechanical Properties Specified Tensile Properties ASTM A240

Form Bar (hot or cold finished) Sheet/Plate
Tensile Min. 80 ksi 80 ksi
Yield Min. (.2% offset) 35 ksi 35 ksi
Elongation Min. 30.00% 30.00%
Reduction of Area Min. 50.00%