... :RK-100 2.Size:1400*2800mm 3.Materials:Q235 4.Hardness:HRC 57-62 5.corrosion resistant RunKun wear ... layer)5+3,6+3,8+3,5+4,6+4,8+4,10+4,6+5,8+5,10+5,15+5 ... Good ExcellentStd sizes(OD) Unlimited 3''to26'' 10''to40'' 4''to24''Handling &Installation Excellent Very good Very good HeavierFabrication Unlimited Some ... steel (3) 5-10 times harder than tool steel (4) 1.5-2.5 times harder than high-chromium steel ...