Questions › Category: Mechanical Engineering › Quenching is not necessary when hardening is done by 0 Vote Up Vote Down VideRime Staff asked 5 years ago Quenching is not necessary when hardening is done by a) Case hardening b) Flame hardening c) Nitriding d) Any one of these Engineering Materials Practice Set-7 Share this Now with Friends: Share on WhatsApp (Opens in new window) WhatsApp Share on Telegram (Opens in new window) Telegram More Related