Abstract: A piston ring in cast tool steels including a ring of a tempered material having a chemical composition including a percent weight concentration of C from 0.80 to 1.40, Cr from 2.50 to 4.20, Mn from 0.10 to 1.00, Mo from 1.00 to 2.00, Nb from 2.50 to 4.50, P of no more than 0.05, S of no more than 0.05, Si from 0.10 to 1.00, Ti from 0.10 to 0.30, V from 1.00 to 3.00, W from 1.00 to 3.00, and a remaining concentration balance of Fe. The tempered material may have a microstructure including a matrix of tempered martensite with precipitation of at least one of secondary M2C carbides and MC carbides, M being at least one of V, Mo, Cr, and W. The microstructure may include NbC eutectic carbides having a cubic morphology. The tempered material may have a hardness from approximately 400 HV to 800 HV.

Abstract: A piston ring in cast tool steels including a ring of a tempered material having a chemical composition including a percent weight concentration of C from 0.80 to 1.40, Cr from 2.50 to 4.20, Mn from 0.10 to 1.00, Mo from 1.00 to 2.00, Nb from 2.50 to 4.50, P of no more than 0.05, S of no more than 0.05, Si from 0.10 to 1.00, Ti from 0.10 to 0.30, V from 1.00 to 3.00, W from 1.00 to 3.00, and a remaining concentration balance of Fe. The tempered material may have a microstructure including a matrix of tempered martensite with precipitation of at least one of secondary M2C carbides and MC carbides, M being at least one of V, Mo, Cr, and W. The microstructure may include NbC eutectic carbides having a cubic morphology. The tempered material may have a hardness from approximately 400 HV to 800 HV.

Abstract: The rolling mill cast roll having a shield portion made of multi-component white iron with excellent resistance to adhesion and propagation of cracks, having a composition consisting essentially, by weight ratio, of 1.5-2.5% carbon, 3.0-10% chromium, 2.0-8.0% molybdenum, 2.0-8.0% tungsten, 2.0-10% vanadium, 0.1-0.8% sulfur, up to 2.0% manganese, wherein the manganese is balanced with said sulfur in a 2:1 ratio (Mn:S), up to 1.0% silicon, up to 1.0% of nickel, 0.1% Ce, up to 0.08% phosphorus and a sufficient amount of Fe, is produced by a centrifugal casting method.

Abstract: The present invention is directed to a rolling mill cast roll with a higher resistance to adhesion and propagation of cracks, and the process for the manufacture thereof, said process comprising the steps of: introduction (1) of waste liquid metal (a), alloy elements (b) and a lot of scrap (c) into a melting furnace; next, melting (2) of the load at about 1,200° C. to 1,500° C.