# Hot Metal Math — Heat-treat ref for bladesmiths

> Heat-treat ref for bladesmiths (iPhone/iPad app by Athol Ironworks LLC.)

- Source: https://appshunter.io/ios/app/hot-metal-math/id6827984113 (this page in markdown: same URL + `.md`)
- Developer: [Athol Ironworks LLC](https://appshunter.io/developer/6827984115)
- Category: Reference, Utilities
- Price: Free with in-app purchases
- Age rating: 17+
- Requires: iOS 15.0 · 25 MB
- Languages: American English
- Released: 2026-11-09
- Data updated: 2026-11-10

## What is 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.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Hot Metal Math Pro | $7.99 | one-time |
| Tip $1 | $0.99 | one-time |
| Tip $3 | $2.99 | one-time |
| Tip $5 | $4.99 | one-time |
| Tip $10 | $9.99 | one-time |
| Tip $25 | $24.99 | one-time |
| Tip $50 | $49.99 | one-time |
| Tip $100 | $99.99 | one-time |


## Is Hot Metal Math safe?

Not enough ratings yet to assess Hot Metal Math.

## Is Hot Metal Math legit?

Hot Metal Math has limited verification signals. The AppsHunter Legitimacy Score for Hot Metal Math is 50 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-11-10

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-10.*