Nickel-chromium-molybdenum alloys wrought through the severe corrosion service are in large part have their specification governed by ASTM and ASME standards, which are applicable to the chemical processing, pollution control, and offshore systems industries. Hastelloy C276 Plate, as one of such alloys, is widely purchased in the solution-annealed state suitable for fabrication projects in the U.S.A, and conforms to the requirements of ASTM B575 and ASME SB-575 standards. Commonly, the thickness of the supplied product goes from 3 mm to 50 mm, whereas the width can reach up to 2000 mm. Alloy C276 is used for pressure vessel shells, heat exchanger tube sheets, and lined reactors mainly because this material resists pitting, crevice and chloride stress corrosion cracking.
Theoretically, C276 is a nickel alloy strengthened by solid-solution with the molybdenum content around 16% and the chromium approximately 15% which is compensated with the addition of tungsten. Flat products such as plates are normally provided in the grade UNS N10276, where mechanical properties are confirmed through tensile and hardness testing. The material of fine grains is often chosen by designers for better weldability, specifically when GTAW or SMAW methods are used in NACE MR0175 environments. The dimension tolerance corresponds to the EN and ASTM standards set for piping systems worldwide.
Long products are just as necessary for parts that are machined, valve internals, and also fasteners that are under acid corrosive mixed environments. Here, Hastelloy C276 round bar is delivered in hot-rolled, cold-drawn, or ground finish variants, to ASTM B574, with the size range from 6 mm to more than 300 mm. Italian market for the precision bar is driven by its use in pump shafts, agitator components, and high-pressure fittings where a uniform microstructure and tight dimensional tolerance is paramount.
