Yes — on Google Play
Steam Chat has a Google Play listing.
App Store
On Google Play
Is Steam Chat on Android?
About Steam Chat
Take your Steam friends, groups, and conversations with you wherever you go. The Steam Chat app includes many key features of the desktop Steam client chat, including: Friends List – See who’s in game or online at a glance. You'll see your custom categories and favorites bar just like you can on your PC. (repeate…
Steam Chat is listed on both the App Store and Google Play from Valve, so you can install it on Android phones and tablets. The Play Store listing shows 10,000,000+ installs.