HS 36 is a cast cobalt-chromium-tungsten superalloy from the Haynes-Stellite series, cross-referenced in this project's source data to DIN designation CoCr19W14NiB. Cobalt is the base element, with chromium for oxidation resistance, tungsten for solid-solution strengthening and elevated-temperature hardness, and a moderate nickel addition for matrix stability. The DIN name's trailing "B" conventionally denotes a boron addition, but no boron content appears in the source composition table available for this page - see the note below.

Correction: the prior version of this page carried a commented-out description calling HS 36 "nickel-based" with "57.7% nickel" - identical boilerplate reused across several unrelated cobalt-alloy pages in the old dataset, contradicted by the alloy's own composition table (nickel ~10%, cobalt the dominant element by a wide margin). That prose has been discarded and the material correctly described as cobalt-base below.

Like other cast members of this family, HS 36 relies on a carbide-and-boride-strengthened microstructure for wear and heat resistance, making it well suited to high-temperature, wear-prone, or corrosive service in cast form, but correspondingly demanding to machine.

HS 36 presents the compounded difficulty typical of the cast cobalt-tungsten superalloys: very high hot-hardness retention layered on top of an abrasive, carbide/boride-rich cast microstructure. Tungsten in particular contributes strong solid-solution strengthening that persists at temperature, so the cutting edge does not get the relief that thermal softening provides in many other materials - mechanical and thermal load on the tool stays high through the entire cut.

As with the rest of the Haynes-Stellite cast family, HS 36 work-hardens rapidly under cutting force. Interrupted cuts, rubbing, or inconsistent chip load leave a hardened surface skin that is significantly harder to machine on the next pass, so maintaining steady engagement and an adequate, consistent feed is essential rather than optional.

Sharp, positive-rake ground carbide inserts, rigid low-deflection setups, conservative and consistent cutting speeds, and generous coolant delivery are the standard countermeasures. Given the abrasive hard-phase content, plan for shorter, more predictable tool life intervals and inspect flank wear frequently rather than pushing to a fixed tool-life target.