ASTM B462 is Standard Specification for Forged or Rolled Nickel Alloy Pipe Flanges, Forged Fittings, and Valves and Parts for Corrosive High-Temperature Service
ASTM B462 covers grades UNS N06030, UNS N06035, UNS N06022, UNS N06200, UNS N06059, UNS N06686, UNS N08020, UNS N08024, UNS N08026, UNS N08367, UNS N10276, UNS N10665, UNS N10675, UNS N10629, UNS N08031, UNS N06045, UNS N06025, and UNS R20033
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. Thissuperalloy 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.
In what forms is Alloy 20 Available?
• 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
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
|
ASTM Specifications
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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