332 is a high-nickel, high-chromium heat-resisting austenitic alloy, built around roughly 31% nickel and 21.5% chromium with a very low carbon content. It sits in the same family as the 330/331 heat-resisting grades already covered elsewhere in this library, but with a leaner, low-carbon composition sometimes described as the low-carbon equivalent of the classic Alloy 800 heat-resisting family. The heavy nickel addition stabilizes the austenitic structure at elevated temperature and gives 332 strong resistance to embrittlement from sigma-phase precipitation and chloride stress corrosion cracking — failure modes that limit lower-alloy stainless grades in continuous high-temperature service.

The alloy is designed first for oxidation, carburization, and sulfidation resistance at elevated temperature rather than for room-temperature corrosion duty, and it holds useful creep and stress-rupture strength in the solution-annealed condition. Typical applications include boiler and pressure vessel components, nuclear vessel internals, appliance heating-element sheathing, and equipment in food, pulp, and petroleum processing where parts see repeated thermal cycling. Because it is austenitic, 332 cannot be hardened by heat treatment — it gains strength only through cold work — and like its 330/331 relatives, it work-hardens readily under a cutting tool, which is the dominant factor shaping how it should be machined.

332's machining behavior is dominated by its nickel content, not its modest as-annealed hardness. At roughly 31% nickel, the alloy is even more prone to work hardening than standard 300-series stainless — every pass that rubs rather than shears cleanly leaves a harder, more abrasive skin behind for the next pass to cut through. Nickel also drives up cutting forces and toughness in the shear zone, and the alloy's low thermal conductivity concentrates cutting heat at the tool tip instead of carrying it away in the chip, accelerating notch and crater wear on inserts that aren't built for high-nickel service.

Sharp, positive-rake geometries and consistently high enough feed to stay under the work-hardened layer from the previous pass are essential. Because 332 is normally supplied and used in heavy-section, high-temperature equipment, stock is often thick-walled and rigid, which helps, but interrupted cuts and scale on as-cast or as-forged surfaces can still chip a marginal edge quickly. Coolant-fed or flood cooling helps control the heat buildup that this alloy's low conductivity creates, and tool changes should happen on a schedule rather than by waiting for visible wear, since a dulling edge on high-nickel material accelerates its own failure.

Chip control is a secondary but real concern — like other high-nickel austenitics, 332 tends to form long, tough, stringy chips rather than the short, well-broken chips typical of carbon steel. A chipbreaker geometry matched to tough, gummy stainless and high-nickel alloys, rather than a general-purpose carbon-steel geometry, makes a measurable difference in tool life and surface finish.