Category: Hastelloy

Hastelloy Alloys: Material Grades & Machining Characteristics

Hastelloy is a premium family of nickel-based superalloys alloyed with molybdenum, chromium, tungsten and iron, divided into B, C, G and X series for distinct corrosive and high-temperature industrial scenarios. Representative grade UNS N10276 (Hastelloy C276) complies with ASTM B575 for plates, sheets and strips, featuring ultra-low carbon to prevent intergranular corrosion after welding. Compared with titanium and Inconel, Hastelloy delivers unmatched resistance to mixed acids, chloride pitting and flue gas corrosion, making it ideal for chemical reactors, desulfurization equipment and precision corrosion-resistant components.
In terms of machining and fabrication, Hastelloy exhibits high ductility, low thermal conductivity and severe work-hardening tendency, which raises strict requirements for CNC turning, 5-axis milling, drilling and threading. Machinists need rigid tool fixtures, coated carbide tools, low cutting speed and sufficient heavy-duty coolant to avoid work hardening, built-up edges and surface cracks. Hot forming requires precise temperature control, while all welded parts adopt matching nickel-based filler wires. Post-processing usually includes solution annealing to restore full corrosion resistance and mechanical performance. Professional manufacturers can process Hastelloy into custom plates, bars, seamless pipes, forgings and complex precision machined parts following ASTM industrial specifications for aerospace, petrochemical and environmental protection industries. We provide professional custom machining services for most grades of Hastelloy alloys.