The Hastelloy C276 Pipe is covered by 2 specifications i.e. ASTM B622 as well as ASTM B619. Typically the ASTM B622 Pipe is constructed in a seamless manner, whereas the construction of the ASTM B619 Pipe is welded. Amongst all the Hastelloy variations the C276 Hastelloy Pipe is the most popular one.
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The low content of carbon in the 2.4819 Alloy C276 Pipe is what minimizes carbide precipitation. Carbide precipitation is a phenomenon that occurs during welding of various alloy grades. A lower carbon based alloy such as the ASTM B619 UNS N10276 2.4819 Pipe is used in several applications which have the need to maintain its corrosion resistance properties in as-welded structures. This specified nickel Hastelloy C276 Seamless Pipe is also resistant to the formation of grain boundary precipitates, especially its occurrence in the weld heat-affected zone. Thus the Hastelloy C276 Welded Pipe is well suited to be used in chemical process application in an as-welded condition. By adding tungsten in the ASTM B622 UNS N10276 Alloy C276 Pipe, its corrosion resistance properties become superior. For example, the ASTM B622 UNS N10276 Pipe exhibits excellent resistance to pitting and crevice corrosion in both reducing and oxidizing environments. Alloy C276 Seamless and Welded Pipes are available in many types such as Square, Round and Rectangular.
Hastelloy Pipe
Hastelloy C276 Pipe
ASTM B622 UNS N10276
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat treatment
Welding
Hot Working
Annealing
Applications
Inconel is a group of austenitic nickel-chromium-based super alloys produced by Special Metals Corporation. Super alloys are referred to as high performance alloys that function well in environments with elevated temperatures.
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Super alloy INCONEL C-276 has high molybdenum content which provides the material with localized corrosion resistance like pitting. This alloy is generally known for corrosion resistance in a wide range of aggressive media. The low carbon content in this alloy helps to reduce carbide precipitation while performing welding.
The following section explains in detail about super alloy INCONEL C-276.
The chemical composition of INCONEL C-276 is outlined in the following table.
Element Content (%) Molybdenum, Mo 15-17 Chromium, Cr 14.5-16.5 Cobalt, Co 2.5 max Manganese, Mn 1 Vanadium, V 0.35 max Silicon, Si 0.08 max Phosphorus, P 0.04 max Sulfur, S 0.03 max Carbon, C 0.01 max Nickel. Ni RemainderThe physical properties of INCONEL C-276 are tabulated below.
Properties Metric Imperial Density 8.89 g/cm3 0.321 lb/in3 Melting point 1325 °C 2417 °FThe following table shows mechanical properties of INCONEL C-276.
Properties Metric Imperial Tensile strength 740.5 MPa 107400 psi Yield strength 347 MPa 50300 psi Elastic modulus 205 GPa 29700 ksi Elongation at break 67% 67%The thermal properties of INCONEL C-276 are tabulated below.
Properties Metric Imperial Thermal conductivity (@23°C/73.4°F) 9.80 W/m-K 68.0 BTU in/hr.ft².°FWeldability of INCONEL alloy C-276 is rated as good. This material can be used as-welded for most applications.
Hot working of this alloy can be performed 870 and 1230°C (1600 and 2250°F). in case of performing heavy working, it has to be above 1090°C (2000°F).
INCONEL alloy C-276 can be annealed at 1150-1175°C (2100-2150°F) and rapidly cooled by water quenching.
INCONEL C-276 is chiefly used in the following areas:
Products made using INCONEL C-276 are as follows:
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