I wouldn’t. I would only use it with strangers if they were of equal or lower perceived status and I was trying to project informality and solidarity or contempt. (“Hey you! Put that back!”) Basically circumstances where I might use “du” in German.
I chiefly use it with family, good friends, and long-standing colleagues that I also feel a rapport with and more often to get someone’s attention than as a greeting. (In other words, it is not a substitute for “hi” in regards to register or pragmatics.)
"Richmond is a real scholar; Owen just learns languages because he can't bear not to know what other people are saying."--Margaret Lattimore on her two sons