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Alloy 20, otherwise called Carpenter® 20 and Incoloy® 20, is an austenitic nickel-iron-chromium alloy. This super combination, which additionally incorporates copper and molybdenum, is well known in the creation of gas, solvents, explosives, synthetic substances, pharmaceuticals, and food and engineered materials. Alloy 20 is a nickel-iron-chromium based, austenitic combination with astounding consumption opposition in concoction situations containing sulfuric corrosive and numerous other forceful media. This alloy is settled with niobium to oppose intergranular consumption. Alloy 20 may give potential cost reserve funds when deliberately contrasted with higher nickel-based combinations while outperforming standard treated steels. Alloy 20, otherwise called Carpenter 20, is a nickel-iron-chromium austenitic alloy that was created for greatest protection from corrosive assault, explicitly sulfuric corrosive. This superalloy has brilliant protection from general consumption, pitting, and cleft erosion in synthetic substances containing chlorides and sulfuric, phosphoric, and nitric acids. It likewise contains niobium for adjustment against refinement and resultant intergranular erosion. Woodworker 20 joins incredible erosion obstruction with raised mechanical properties and generally simple manufacture. Albeit initially intended for use in sulfuric corrosive related ventures, Alloy 20 is presently a mainstream decision for a wide assortment of enterprises including the substance, food, pharmaceutical, and plastics businesses. What’s more, this superalloy is utilized in heat exchangers, blending tanks, metal cleaning and pickling gear, and funneling.

It offers clients a wide assortment of advantages including:

  • Fantastic protection from erosion, fissure consumption, and pitting 
  • Ideal for use around sulfuric, phosphoric, and nitric acids 
  • The Simplicity of manufacture and raised mechanical properties 

Accessible in the level bar, manufacturing stock, hexagon, plate, pipe, sheet, strip, round bar, cylinder, and wire, 

Alloy 20 can be created to deliver: 

  • Blending Tanks 
  • Warmth Exchangers 
  • Cycle Piping 
  • Pickling Equipment 
  • Pumps, valves, clasp, and fittings 

Combination 20 meets or surpasses distinctive industry guidelines including a large number of ASTM, ASME, ISO, and DIN principles. TIG, MIG, and SAW welding can be utilized on Alloy 20 and can be framed through hot and cold working. 

Combination 20 has a novel synthetic creation: 

  • Fe 31-44% equalization 
  • Ni 32.5-35% 
  • Cr 19-21% 
  • Cu 3-4% 
  • Mo 2-3% 

Because of its high nickel content (32-38%), there is some difference whether Alloy 20 is a nickel or a treated steel amalgam. Regardless of what side of the conversation you fall on, unmistakably Alloy 20 is a magnificent decision for a wide assortment of enterprises and applications. At Continental Steel, we are pleased to stock and sell Nickel Alloy 20, Carpenter® 20, and Incoloy® 20 in the entirety of the famous sizes and structures.

Mechanical Properties:

FormTensile Min.Yield Min. (.2% offset)Elongation Min.Reduction of Area Min.
Bar (hot or cold finished)80 Ksi35 Ksi30%50%
Sheet/Plate80 Ksi35 Ksi30%

Industries and Applications 

Alloy 20 is utilized in an assortment of ventures, including substance handling, petrochemical and refining, marine, pharmaceutical, and food preparation. End-use applications incorporate capacity tanks, blending tanks, agitators, pump and valve parts, food processing equipment, clasp, and fittings. Applications are restricted to the most extreme temperature of 1000°F per ASME. It is additionally imperative to decide whether the important erosion opposition can be accomplished inside the given condition. 

Protection from Corrosion 

Alloy 20 has awesome protection from sulfuric corrosive. This combination additionally shows appropriate obstruction in phosphoric corrosive, nitric corrosive, and fluid salt arrangements. Alloy 20 is a magnificent choice when chloride stress erosion splitting is an issue, as it opposes pitting and cleft consumption. Alert ought to be taken in chloride particles containing conditions in light of the fact that the erosion rate can increase fundamentally.

Fabrication and Heat Treatment

Alloy 20 can be formed by either hot-working or cold-work using traditional methods. Hot forged material should be heated between 2100°F and 2250°F with careful temperature control ensuring that the material does not fall below 1800°F prior to forging. After hot working, anneal the material by heating to 1725°F and 1850°F for a minimum of 30 minutes per inch of thickness followed by water quench.

When stress relieving is desired, heat to a temperature below 1000°F followed by water quench after the desired time at temperature has been established. Annealing Alloy 20 should be between 1725°F and 1850°F for 30 minutes at temperature per inch of thickness. A lower hardness can be obtained by heating to 2100°F but this may have a negative effect on the stabilization of the alloy.

Welding Alloy 20 is commonly performed via, TIG, MIG as well as submerged arc welding (SAW) using either the matching filler metal, ER320LR for TIG and MIG and E320LR for SAW. When welding to dissimilar alloys such as 316 or higher alloys such as C276 and Alloy 22, AWS ERNiCrMo-3 can be used for TIG and MIG while using ENiCrMo-3 for SAW.

Common Trade Names

  • INCOLOY® alloy 20, Carpenter® 20 alloys, 20CB-3®
  • INCOLOY® is a registered trademark of the Special Metals Corporation group of companies.
  • Carpenter® and 20CB-3® have registered trademarks of Carpenter.
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