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Hastelloy C-276 Plates

Hastelloy Alloy® C276 is an age-hardenable nickel-cobalt chromium-molybdenum alloy designed specifically to combine good age strength properties with excellent fabrication characteristics in the annealed condition. The high molybdenum content provides resistance to localized corrosion. Low carbon minimizes carbide precipitation during welding. This alloy maintains very good corrosion resistance in a broad variety of chemcial process and aqueous environments. Alloy C276 exhibits excellent intermediate temperature tensile ductility, and is not normally subject to strain age cracking problems common for other gamma prime strengthened alloys. Alloy C276 is typically used for applications up to about 1650°F (900°C).

Hastelloy C276 is a nickel-molybdenum-chromium superalloy with an addition of tungsten designed to have excellent corrosion resistance in a wide range of severe environments. The high nickel and molybdenum contents make the nickel steel alloy especially resistant to pitting and crevice corrosion in reducing environments while chromium conveys resistance to oxidizing media. The low carbon content minimizes carbide precipitation during welding to maintain corrosion resistance in as-welded structures. This nickel alloy is resistant to the formation of grain boundary precipitates in the weld heat-affected zone, thus making it suitable for most chemical process application in an as welded condition.

Characteristics of Hastelloy C276 :

- Excellent corrosion resistance in reducing environments
- Exceptional resistance to strong solutions of oxidizing salts, such as ferric and cupric chlorides
- High nickel and molybdenum contents providing good corrosion resistance in reducing environments
- Low carbon content which minimizes grain-boundary carbide precipitation during welding to maintain resistance to corrosion in heat-affected zones of welded joints
- Resistance to localized corrosion such as pitting and stress-corrosion cracking
- One of few materials to withstand the corrosive effects of wet chlorine gas, hypochlorite and chlorine dioxide

Fabrication with Hastelloy C-276 :

Hastelloy C-276 alloy can be forged, hot-upset and impact extruded. Although the alloy tends to work-harden, you can have it successfully spun, deep-drawn, press formed or punched. All of the common methods of welding can be used, although the oxyacetylene and submerged arc processes are not recommended when the fabricated item is for use in corrosion service.

Chemical Composition :

Elements Percent By Weight
Chromium 14.5 - 16.5
Nickel Bal. Maximum
Manganese 1.0 Maximum
Silicon 0.08 Maximum
Vanadium 0.35 Maximum
Tungsten 3.5 - 4.5
Sulfur 0.03 Maximum
Carbon 0.01 Maximum
Iron 4.0 - 7.0
Phosphorus 0.04 Maximum
Molybdenum 15.0 - 17.0
Columbium 2.5 Maximum

Physical Properties :

Specific Heat at 70°F 0.102 Btu/lb °F
Elastic Modulus at 70°F 29.8 x 10 psi
Electrical Resistivity at 75°F 1.30 µΩ·m
Specific Gravity 8.90
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