Abstract: A railway car wheel comprises a rim having a flange and a tread portion. The tread portion contains 0.35-0.55% C and has a Vickers hardness of at least 360 and comprises a bainite structure, a tempered martensite structure, or a mixture of both.

Abstract: A railway car wheel comprises a rim having a flange and a tread portion. The tread portion contains 0.35-0.55% C and has a Vickers hardness of at least 360 and comprises a bainite structure, a tempered martensite structure, or a mixture of both.

Abstract: A method of casting non-ferrous metals such as aluminum, magnesium, or zinc alloys uses casting components made from a tool steel comprising effective amounts of carbon, silicon, manganese, chromium, molybdenum, and vanadium, optional amounts of cobalt and increased level of molybdenum. Using the tool steel as a casting component, particularly as a mold, provides improvements in corrosion resistance, oxidation resistance, softening resistance, degradation resistance and deformation resistance. The tool steel casting component has a chromium oxide layer which is formed, in one mode, during the casting operation, to enhance the life and durability of the casting component and improve its casting performance.

Abstract: A method of producing a tool steel comprises quenching a steel containing, by mass percent, C: 0.25 to 0.60%, Si: 0.10 to 1.20%, Mn: 0.20 to 1.50%, Ni: 0.50 to 2.00%, Cr: 1.00 to 4.20%, Mo: 0.30 to 2.00%, V: 0.10 to 1.00% and Al: 0.005 to 0.10%, in order to obtain a hardness H such that the hardness index defined below by the formula (1) becomes between 0.20 to 0.95; and then tempering the steel; K=(H−H2)/(H1−H2)  (1) Where H1: Vickers hardness of the steel with 10 mm thickness after heating to a temperature of the Ac3 transformation point plus 50° C., and quenching into water; H2: Vickers hardness of the steel with 10 mm thickness after heating to the same temperature as defined above, and cooling to room temperature over 20 hours.

Abstract: A process for producing alloy steel powder, particularly, low-oxygen, low-carbon alloy steel powder is disclosed. The process comprises: preparing molten steel which contains at least one easily oxidizable element selected from the group consisting of chromium, manganese, vanadium, niobium, boron and silicon; atomizing said molten steel by means of an atomizing agent containing a non-oxidizing medium to provide as-atomized alloy steel powder containing 0.2% by weight or less of oxygen and 0.1% by weight or more of carbon; decarburizing the resulting powder by maintaining it in an atmosphere containing at least H.sub.2 and H.sub.2 O gases under specified conditions; and cooling the thus decarburized alloy steel powder to room temperature in an inert or reducing atmosphere.

Abstract: An oil-atomized low-alloy steel powder having improved compressibility, compactibility and hardenability is disclosed. The steel powder has the chemical composition: C: no greater than 0.02%, Mn: 0.3-2.0%, oxygen: no greater than 0.10%, one or more of Cr: 0.1-2.0%, Mo: 0.05-1.0%, Ni: 0.1-2.0%, Cu: 0.2-2.0%, V: 0.03-0.5% and Nb: 0.05-0.5%, and the balance substantially iron.