No. Austenitic stainless (304, 316) work-hardens differently and does not follow the Table 1 steel curve. Using this tool for stainless can be off by several Rockwell points. ASTM E140 has separate tables, and many stainless mills publish their own correlation. Treat any cross-scale stainless conversion as an estimate at best.

For carbon and alloy steel it is a useful first approximation, roughly UTS in ksi equals half the Brinell number up to about 300 HB. Real tensile depends on microstructure, so the spread can be 10% or more. It is fine for sorting and sanity checks, not for certification.

Each scale has a band where its indenter gives valid readings (HRC 20 to 68, HRB 0 to 100, and so on). When your input converts to a value past another scale’s limit, that cell is grayed and flagged, because the equivalence is extrapolated and unreliable there.

HBW is the modern Brinell using a tungsten carbide ball; older HB or BHN often meant a steel ball, which deforms on hard material. For steel in the common range they line up, and the values here follow the 10 mm ball, 3000 kgf HBW convention.