T1 HSS steel plate 1. T1 is hardened to 64 RC, and cuts and grinds much the same as M2. 2. W18Cr4V,T1,1.3355,SKH2 T1 HSS steel plateHigh Speed steelSteel No.GBAISIDINJISW18Cr4VT11.3355SKH2T1 is a well liked European grade and is made of 18% Tungsten for extra long runs. T1 is hardened to 64 RC, and cuts and grinds much the same as M2. T1-HSS is popular in mills that do long runs in mostly ...