Alloy C-276 (UNS N10276) is a tungsten-containing nickel-chromium-molybdenum alloy with extremely low silicon and carbon contents. It is a corrosion-resistant alloy composed mainly of chromium and molybdenum. Due to the low carbon content, carbide precipitation is minimized during welding, so the resistance to intergranular corrosion in the heat-affected zone of the welded joint can be maintained.
UNS N10276 is a deformable nickel-chromium-molybdenum material. Because of its extremely low carbon and silicon content, it can reduce stress during welding. Like other nickel alloys, it is ductile, easy to form and weld, and has excellent resistance to stress corrosion cracking in chloride-containing solutions (austenitic stainless steel is prone to this degradation). The high chromium and molybdenum content can resist oxidizing and non-oxidizing acids, and has excellent resistance to pitting and crevice corrosion in the presence of chlorides and other halides.
ALLOY C-276 product standards: ASTM B574, DIN 17752, ASTM B564
Alloy c276 is also called Hastelloy C-276, UNS N10276, W.Nr.2.4819, NiMo16Cr15W (Germany), NC17D (France), ns334 (China)
Chemical composition
Carbon C: ≤0.02
Silicon Si: ≤0.08
Manganese Mn: ≤1.00
Phosphorus P: ≤0.040
Sulfur S: ≤0.03
Chromium Cr: 14.5~16.5
Molybdenum Mo: 15.00~17.0
Tungsten W: 3.0~4.5
Iron Fe: 4.0~7.0
Vanadium V: ≤0.35
Physical properties:
Main performance indicators of C276:
Density: 8.89g/cm³;
Melting point: 1325℃~1350℃;
Tensile strength: σb≥730Mpa
Elongation: δ≥40%
Hardness: HRB≤100
Heat treatment: In the absence of special regulations and requirements, C-276 alloy is solution treated. That is, heated at 1121℃ and then rapidly cooled. In this state, C-276 alloy has the best comprehensive properties such as corrosion resistance and mechanics.
GNEE's Alloy C-276 (UNS N10276) supply specifications: round bars, steel plates, cold-rolled sheets, forgings, seamless pipes, capillaries, wires, strips.
Processing properties of Alloy C-276
Welding properties: C-276 alloy has good welding properties and can be welded by general welding methods without special difficulties. Among them, TIG, MIG and manual arc welding are the most commonly used. But acetylene welding is not recommended when used for corrosion resistance. To prevent excessive heat input during welding, special attention should be paid to submerged arc welding.
Hot and cold processing forming properties: C-276 alloy and Hastelloy C alloy have the same hot and cold processing forming properties.
C-276 alloy can be hot forged, hot rolled, hot pressed, hot extruded and hot formed. But compared with austenitic stainless steel, it is more sensitive to strain and strain rate, and has a narrower hot working temperature range. For example, the recommended initial forging temperature for hot forgings is 1232°C, and the recommended final forging temperature is 954°C. Moderate deformation and frequent heating provide the best results. This alloy is harder than most austenitic stainless steels and requires more energy during cold forming.
