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.

ASME SB163 Seamless Nickel and Nickel Alloy Condenser and Heat Exchanger Tube

ASME SB165 Seamless Nickel-Copper Alloy Seamless Pipe and Tube

ASME SB167 Seamless Nickel-Chromium-Iron Alloy and Nickel-Chromium-Cobalt-Molybdenum Alloy Seamless Pipe and Tube

ASME SB407 Seamless Nickel-Iron-Chromium Alloy Pipe and Pipe

ASME SB423 Seamless Nickel-Iron-Chromium-Molybdenum-Copper (UNS N08825 and UNS N08221) Nomenclature Pipes and Tubes

ASME SB444 Seamless Nickel-Chromium-Molybdenum-Nickel Alloy (UNS N06625) and Nickel-Chromium-Molybdenum-Si Alloy (UNS N06219) Pipe and Tube

ASME SB622 Seamless Nickel and Nickel-Cobalt Alloy Pipe and Pipe

ASME SB668 UNS N08028 Seamless Tube

ASME SB690 Seamless iron-nickel-chromium-molybdenum (UNS N08366, UNS N08367) nominal pipe and pipe

ASEM SB729 Seamless UNS N08020, UNS N08026, UNS N08024 Nickel Alloy Pipe and Pipe

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