The present invention discloses a low cost lean production bainitic steel wheel for rail transit and a manufacturing method therefor. The steel wheel contains elements with the following weight percentages: carbon C: 0.15-0.45%, silicon Si: 1.00-2.50%, manganese Mn: 1.20-3.00%, rare earth RE: 0.001-0.040%, phosphorus P≤0.020%, and sulphur S≤0.020%, where the remaining is iron and unavoidable residual elements, and 3.00%≤Si+Mn≤5.00%. Compared with the prior art, through alloying design and a preparation process, especially a heat treatment process and technology, a rim of the wheel obtains a carbide-free bainite structure, and a web and a wheel hub obtain granular bainite, a supersaturated ferritic structure, and a small amount of pearlite. The wheel has high comprehensive mechanical properties and service performance. In addition, the heat treatment process and technology are fully used without particularly adding alloying elements such as Mo, Ni, V, Cr, and B, to greatly reduce costs of steel and realize lean production.

A railway wheel is capable of suppressing formation of pro-eutectoid cementite even if the C content is high. The railway wheel has a chemical composition consisting of: in mass %, C: 0.80 to 1.15%; Si: 0.45% or less; Mn: 0.10 to 0.85%; P: 0.050% or less; S: 0.030% or less; Al: 0.120 to 0.650%; N: 0.0030 to 0.0200%; Cr: 0 to 0.25%; and V: 0 to 0.12%, with the balance being Fe and impurities, wherein an amount of pro-eutectoid cementite, which is defined by Formula (1), in a microstructure of the railway wheel is not more than 1.50 pieces/100 μm: Amount of pro-eutectoid cementite (pieces/100=a total sum of the number of pieces of pro-eutectoid cementite which intersect with two diagonal lines in a square visual field of 200 μm×200 μm/(5.66×100 μm) (1).

A wheel disc including a bolt hole for bolt fastening, includes a first region extending to have a predetermined width in a circumferential direction of the bolt hole and a second region, other than the first region, wherein the first region has an average tensile strength lower than that of the second region.

The chemical composition of the railway wheel of the present embodiment consists of: in mass %, C: 0.80 to 1.60%, Si: 1.00% or less, Mn: 0.10 to 1.25%, P: 0.050% or less, S: 0.030% or less, Al: 0.010 to 0.650%, and N: 0.0030 to 0.0200%, with the balance being Fe and impurities, and wherein, in a microstructure of the web part of the railway wheel, an area fraction of pearlite is 85.0% or more, an area fraction of pro-eutectoid cementite is 0.90 to 15.00%, and an average value of a width W of the pro-eutectoid cementite defined by Formula (1) is less than 0.70 μm:

W=½×(P/2−((P/2).sup.2−4A).sup.1/2)  (1) where, in Formula (1), A is an area (μm.sup.2) of the pro-eutectoid cementite, and P is a circumference length (μm) of the pro-eutectoid cementite.

A charging device for the heat treatment of workpieces being provided with a hub, comprising a charging support, a shaft and at least one auxiliary hub, wherein the workpiece can be vertically supported on the shaft by auxiliary hub(s) precisely fitted into the hub, and the shaft being supported by the charging support as well as use of auxiliary hubs for the dimensionally stable hardening of gear-wheels in vertical position.

A charging device for the heat treatment of workpieces being provided with a hub, comprising a charging support, a shaft and at least one auxiliary hub, wherein the workpiece can be vertically supported on the shaft by auxiliary hub(s) precisely fitted into the hub, and the shaft being supported by the charging support as well as use of auxiliary hubs for the dimensionally stable hardening of gear-wheels in vertical position.

The method for the heat treatment of a steel reinforcing element (F) for a tire comprises a transformation of the steel microstructure and in which the temperature of the reinforcing element (F) is reduced during the transformation of the steel microstructure by simultaneously extracting heat from the reinforcing element (F) and supplying heat to the reinforcing element (F).

The method for the heat treatment of a steel reinforcing element (F) for a tire comprises a transformation of the steel microstructure and in which the temperature of the reinforcing element (F) is reduced during the transformation of the steel microstructure by simultaneously extracting heat from the reinforcing element (F) and supplying heat to the reinforcing element (F).

The present invention relates to a method and to a device (10) for producing a wheel rim (1) for a vehicle wheel (3), and to a method for producing a vehicle wheel (3).

Provided is a heat treatment apparatus capable of more reliably conveying a workpiece along a desired conveyance path by a simple configuration. A heat treatment apparatus 1 includes a heating chamber 7, a cooling chamber 8 disposed adjacent to the heating chamber 7, a conveyance tray 2 to support the workpiece 100, and a first conveyance mechanism 3 to convey the conveyance tray 2 along a conveyance path B1 from the outside of the heating chamber 7 to the outside of the cooling chamber 8 through the heating chamber 7 and the cooling chamber 8.