Hot Metal Math

Hot Metal Math is an offline heat-treating reference for blacksmiths, bladesmiths and knife makers, from forge to temper. STEELS • 77 steels, from simple carbon steels like 1084 and 1095 to oil-hardening, tool and stainless grades (34 free). • Each steel covers forging, normalizing, annealing, hardening, quench and temper, in °F and °C. • Temper-vs-hardness (HRC) tables where a published source prints them. • Every value is credited to its source on the Sources screen. • Search by name or alias, filter by family, and star favorites. TOOLS • Glow chart: approximate steel color vs. temperature. • °F / °C converter with the matching glow color. • Soak: soak time by thickness. • Temper timer: set minutes and cycles and get a notification at the end of each cycle. (Focus and silent mode can hide notifications, so keep an eye on the clock too.) • Damascus and san mai: 3 combos free. PRO: one-time $7.99, no subscription, restorable • No banner ads • All 77 steels • Every Damascus and san mai combo, pairing check and layer count • Planner: steel and thickness to a soak, quench and temper plan • Heat-treat log with CSV export TIPS Optional tips from $1 to $100 support development. They don't unlock anything and don't remove ads. PRIVATE BY DESIGN No account. Your favorites, notes and log stay on your phone. The free version shows Google AdMob banner ads. Reference only, not professional or engineering advice. Always check the steel maker's data sheet and follow safe shop practice. Made by Athol Ironworks LLC.