Product Overview High-Integrity Filler Metal Overview: Crack-Resistant Hastelloy C276 Alloy Chemistry Hastelloy C276 is an ultra-low carbon nickel-molybdenum-chromium-tungsten alloy widely recognized as the premier solution for harsh chemical processing and high-pressure vessel fabrication. In thick-plate pressure vessel welding, uneven heat input and high restraint often cause conventional nickel filler rods to suffer from hot cracking or heat-affected zone (HAZ) corrosion