Materials of Construction - Metals - Alloy C-276
September 29, 2004

Introduction Chemical Composition Corrosion Resistance Physical Properties Mechanical Properties

Associated Links Hastelloy C-2000

Introduction

Alloy C-276 (UNS N10276) is a nickel-molybdenum-chromium wrought alloy that is generally considered the most versatile corrosion-resistant alloy available.   Alloy C-276 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 precipitates in the weld heat-affected zones, thus making it suitable for most chemical process applications in the as-welded condition.

Alloy C-276 has outstanding resistance to localized corrosion and to both oxidizing and reducing media.  Because of its versatility, alloy C-276 can be used where upset condtions are likely to occur or in multipurpose plants.

Alloy C-276 has exceptional 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 desulphurization systems because of its excellent resistance to sulphur compounds and chloride ions encountered in most scrubbers.  Alloy C-276 has excellent resistance to pitting, stress-corrosion cracking and to oxidizing atmospheres up to 1038°C (1900°F).  It is also one of the few materials that withstands the corrosive effects of wet chlorine gas, hypochlorite and chlorine dioxide.

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Chemical Composition (%)

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Corrosion Resistance

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Physical Properties

Density	8890 kg/m³ (554.7 lb/ft³) @ 22ºC (72ºF)
Melting Point	1323 to 1371ºC (2415 to 2500ºF)
Specific Heat	427 J/kg K (0.102 BTU/lb ºF) @ room temp
Electrical Resistivity	1.30 microhm m (51 microhm in) @ 24ºC (75ºF)
Thermal Conductivity	9.4 W/m K (65 BTU in/ft² h ºF) @ -17.8ºC (0ºF)
	10.2 W/m K (71 BTU in/ft² h ºF) @ 38ºC (100ºF)
	11.1 W/m K (77 BTU in/ft² h ºF) @ 93ºC (200ºF)
	13.0 W/m K (90 BTU in/ft² h ºF) @ 204ºC (400ºF)

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Mechanical Properties

Hardness, Rockwell

Rb 90 (sheet) Rb 87 (plate)

	Condition	Temperature	Ultimate Tensile Strength	Yield Strength @ 0.2% offset	Elongation in 50.8 mm (2 inches)
Plate (4.8 - 25.4 mm) (3/16" - 1")	Heat treated @ 1211ºC (2050ºF) Rapid Quench	204ºC (400ºF)	682 MPa (98.9 ksi)	263 MPa (38.2 ksi)	61%
Sheet (1.6 - 4.7 mm) (0.063 - 0.187 in)	Heat treated @ 1211ºC (2050ºF) Rapid Quench	204ºC (400ºF)	695 MPa (100.8 ksi)	290 MPa (42.1 ksi)	56%

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