Excellent Resistance to Corrosion
HASTELLOY® C-276 alloy is a nickel-molybdenum-chromium wrought alloy that is generally considered a versatile corrosion-resistance alloy. C-276 alloy is an improved wrought version of alloy C in that it usually doesn't need to be solution heat-treated after welding and has vastly improved fabricability. This alloy resists the formation of grain-boundary precipitaties in the weld heat-affected zone, thus making it suitable for most chemical process applications in the as-welded condition. However, in environments where attack of the C-276 alloy weld joint is experienced, C-22® weld filler materials should be considered.
C-276 alloy has excellent resistance to localized corrosion and to both oxidizing and reducing media. Because of its versatility, C-276 alloy can be used where "upset" conditions are likely to occur or in multipurpose plants.
HASTELLOY C-276 alloy has excellent resistance to a wide variety of chemical process environments, including strong oxidizers such as ferric and cupric chlorides, hot contaminated media (organic and inorganic), chlorine, formic and acetic acids, acetic anhydride, and seawater and brine solutions. It is used in flue gas desulfurization systems because of its excellent resistance to sulfur compounds and chloride ions encounted in most scrubbers. C-276 alloy has excellent resistance to pitting and to stress-corrosion cracking. It is also one of the few materials that withstands the corrosive effects of wet chlorine gas, hypochlorite, and chlorine dioxide.
Fabricated by a Variety of Methods
HASTELLOY C-276 alloy can be forged, hot-upset, and impact extruded. Although the alloy tends to work-harden, it can be successfully deep-drawn, spun, press formed or punched. All of the common methods of welding can be used to weld HASTELLOY C-276 alloy, although the oxyacetylene process is not recommended. Special precautions should be taken to avoid excessive heat input.
Detailed fabricating information is available in the booklet, "Fabrication of HAYNES® Corrosion-Resistant Alloys". Ask for booklet H-2010.
Available in Wrought Form
HASTELLOY C-276 alloy is available in the form of plate, sheet, strip, billet, bar, wire, covered electrodes, pipe, tubing, pipe fittings, flanges, and fittings.
Wrought forms of HASTELLOY C-276 alloy are furnished in the solution heat-treated condition unless otherwise specified. C-276 alloy is normally solution heat-treated condition unless otherwise specified. C-276 alloy is normally solution heat-treated at 2050°F (1121°C) and rapid quenched. If possible, parts which have been hot-formed should be solution heat-treated prior to final fabrication or installation.
ASME Boiler and Pressure Vessel Code
HASTELLOY C-276 alloy plate, sheet, strip, bar, tubing, and pipe are covered by ASME specifications SB-574, SB-575, SB-619, SB-622, and SB-626 under UNS number N10276.
In aggressive/corrosive service, when nothing else works, many industries have traditionally turned to HASTELLOY® C-276
alloy. Many years of outstanding performance in a variety of industrial applications have confirmed the advantages of
using the alloy. Materials engineers in the chemical processing and other industries have grown accustomed to
specifying its high performance based on laboratory testing, field trials and/or prior experience.
Some "generic" alloy N10276 products fail to measure up to the performance industry expects from HASTELLOY C-276
alloy which is produced via exacting processes, and backed by years of experience in chemistry control, thermal-mechanical
processing, testing and qualifications to rigid standards.