A bare numeric designation of "600" is too ambiguous to identify with confidence, and we want to be upfront about that rather than guess. Note first what this page is not: it is not Inconel® 600 (UNS N06600), the well-known nickel-chromium superalloy — that alloy already has its own dedicated, fully-verified page elsewhere on this chart. This page's designation appears standalone, without an Inconel, Incoloy, Hastelloy, or other alloy-family prefix attached to it in the source material.

We checked the numeric designation "600" against the systems that commonly use bare numbers: it doesn't fall within the AISI/SAE carbon and alloy steel numbering blocks (which run in the 10xx-99xx ranges by alloy family), it isn't a standard AISI stainless series number (those run 2xx/3xx/4xx/5xx), and it doesn't match a commonly published ASTM, ISO, ASME, or ISO ISO/TS tool-steel or structural-steel numeric code that we could confirm. It's possible "600" refers to a proprietary mill grade, a regional standard, a mechanical-property class number (e.g., a minimum tensile or hardness figure used as shorthand in some supplier catalogs), or a data-entry artifact from the original source — we don't have enough information to say which.

The legacy version of this page carried no chemistry, no standards cross-reference, and no cutting-speed data of its own. Rather than invent composition or machining data for an alloy we can't positively identify, we're leaving this page as an honest placeholder.

If you're machining material spec'd to you as "600," send FM Carbide the mill certificate or supplier data sheet for your specific material lot, and we'll match you to the correct carbide grade and cutting parameters for the actual alloy in hand.