... furnace for optional Detailed Product Description .4140/1.7225 alloy tool steel bar 1.Grade:Alloy steel bar AISI 4140 / GB ... .Application: Mainly used for making various kinds of machinery,automobile,mining spare part.4.Process: EAF+LF+VD (ESR furnace for ... , 1.2316, 1.2083 etc.Hot work tool steel: H11, H13 etc.Cold word tool steel: O1, D2, D3, D6 etcHigh speed ...