Alloy C276 / UNS N10276
Corrosion Material’s C276 is a solid-solution-strengthened, nickel-molybdenum-chromium alloy with a small amount of tungsten, which exhibits excellent corrosion resistance in an assortment of harsh environments. Applications include and are not limited to, stack liners, ducts, dampers, scrubbers, stack-gas re-heaters, heat exchangers, reaction vessels and evaporators. Industries where C276 can be utilized are petrochemical and chemical processing, power generation, pharmaceutical, pulp and paper production and waste treatment to name a few.
Resistance to Corrosion
C276 is known as the most universally corrosion resistant material available today. It is used in a variety of environments from moderately oxidizing to strong reducing conditions. The limiting factor when dealing with strong oxidizing environments is the low Cr content, which means that hot, concentrated nitric acid environments are NOT desirable. Although, C276 has exceptional resistance to sulfuric acid and hydrochloric acid, acid chlorides, solvents, formic and acetic acids, acetic anhydride, wet chloride gas, hypochlorites and chlorine solutions. Also, it has excellent resistance to phosphoric acid at all temperatures below boiling and at concentrations lower than 65%.
Alloy C276 has excellent resistance to pitting, stress-corrosion cracking and to oxidizing atmospheres. C276 also exhibits excellent resistance to corrosion by seawater especially under crevice conditions, which induce attack in other commonly used materials.
Fabrication and Heat Treatment
C276 can be formed using various cold and hot working processes. Although C276 tends to work-harden it can be cold formed using the more aggressive methods such as deep-drawing, press forming or punching. Hot forming should be performed within a temperature range between 1600°F and 2250°F (870°C-1230°C) with heavier sections heated to a minimum of 2000°F before forming. Annealing of the material after working is advised and should be performed at a temperature between 2050°F and 2150°F followed by a rapid quench in a protective atmosphere or in an agitated reducing quench bath. To obtain a reducing media, add 2% (by volume) of either ethyl or propyl alcohol to water.
N10276, ASTM B574, ASME SB574, ASTM G28-A/B, EN 10204-3.1, ASME B18.2.2, ASTM B619, ASME SB619, ASTM B366, ASME SB366, WPHC276, ASME B16.11, ASTM B564/ASME SB564, COLD DRAWN, HOT FINISHED, ASTM B575, ASME SB575, COLD ROLLED, HOT ROLLED, ASME B16.9, ASME B16.5, ASTM B462, ASME SB462
Common Trade Names
INCONEL® alloy C-276, Hastelloy® C-276 alloy
INCONEL® is a registered trademark of the Special Metals Corporation group of companies. HASTELLOY® is a registered trademark of Haynes International Inc.