ALLOY STEEL PRODUCT, DIE BLOCKS AND OTHER FORGINGS AND CASTINGS MADE THEREOF AND A METHOD TO MANUFACTURE THE PRODUCT

摘要

AbstractThe invention refers to a method for manufacturing a steel producthaving a very high hardenability in relation to its alloying content.The method is characterized by melting at least the bulk of a steelcomposition containing a majority of alloy ingredients to produce asteel me superheating said steel melt at a temperature of at least1625°C and maintaining said melt at said temperature for at least twominutes to form a supertreated me prior to said superheating addingto said steel composition at least one micro-alloying ingredientselected from the group consisting of aluminum, titanium, andzirconium; teeming and casting said superheated melt to form castproducts; and hot-working said cast products to form said steelproduct.The invention also concerns a steel product in the form of a block,bar, plate, or forged shape or casting made according to the abovemethod from a steel having the following composition in weightpercent: Carbon 0.12 to 0.75, Manganese 0.3 to 1.5, Silicon fromtraces up to 1.0, Chromium from traces up to 5.0, Nickel from tracesup to 2.0, Molybdenum 0.05 to 3.0, Vanadium 0.05 to 1.5, Niobium fromtraces up to 0.3, Phosphorus 0.03 max, Sulphur from traces up to 0.05,Aluminum 0.02 to 0.16 or, Titanium 0.015 to 0.08 or, Zirconium 0.015to 0.08 or, at least two of Aluminum, Titanium and Zirconium, whereinthe total amount of Al + 2(Ti + Zr) is about 0.02 to about 0.16.