Heat Treater's Guide Companion APK for Android

I was digging through old forums trying to figure out the right temp for air-hardening steel after a failed quench, and someone mentioned this Heat Treater's Guide Companion APK for Android. Honestly, I didn’t expect much from a free app with no clear developer, but it actually saved me time that day. No fluff, just straight data on alloys and their recommended treatments. It’s not flashy, but when you’re elbow-deep in a project and need a quick answer, it’s there.

The good stuff

What clicked was how it mirrors the ASM Heat Treater’s Guide without needing the book. I pulled up 4140 steel, saw the hardening range, and had my parameters in under a minute. The layout is simple-just search by alloy name or browse categories-and it doesn’t crash when you switch between tabs. Plus, the ability to add custom alloys is a small win. I tossed in a weird tool steel I found in an old toolbox, gave it a few notes, and now I’ve got a personal reference. Feels like I’m building my own mini database over time.

The not-so-good

It’s clearly not built for mobile-first design. The interface looks like it hasn’t been touched since 2015. Text is cramped, buttons are tiny, and scrolling through long lists feels sluggish on older phones. There’s no offline access warning either-if you’re in a shop with spotty Wi-Fi, you’re out of luck. And yeah, the developer is unknown, which makes me wonder about updates or support. No changelog, no contact info. If something breaks, you’re on your own. Also, no real sorting options beyond alphabetical. If you want to see all high-carbon steels at once, too bad-you gotta scroll.

Bottom line

If you’re doing any kind of heat treatment work and already have the ASM guide, this APK for Android is worth downloading. It’s free, functional, and does exactly what it promises-quick alloy lookup. But don’t expect polish or modern features. It’s a utility, not a slick app. Skip it if you’re looking for tutorials, videos, or step-by-step guidance. For pure data? It’s decent enough to keep around. Just know it’s not going to win any design awards.