Interesting facts about Tungsten in steel

Tungsten is a very pronounced carbide former (its carbides are very hard) and restricts the γ-phase. It improves toughness and prevents grain growth. W increases high temperature strength and retention of temper as well as wear resistance at high temperatures (red heat) and thus cutting ability. It is therefore alloyed primarily to high speed and hot forming tool steels, as well as creep-resistant steel types and to ultra-hard steels. Significant increase in coercive field intensity, thus alloying element of permanent magnet steel alloys. W impairs scaling resistance. Its high specific gravity is particular noticeable in high W-alloy high speed and hot forming tool steels.