A method of recovery heat treatment of a workpiece includes contacting at least a portion of the workpiece with a fluid heated to a temperature sufficient to heat the at least a portion of the workpiece to a predetermined temperature range in a predetermined time period. The method may be implemented as a first step of a two-stage recovery heat treatment or annealing process, followed by a second step of heating the at least a portion of the workpiece to a final target temperature by another annealing process.

A method of recovery heat treatment of a workpiece includes contacting at least a portion of the workpiece with a fluid heated to a temperature sufficient to heat the at least a portion of the workpiece to a predetermined temperature range in a predetermined time period. The method may be implemented as a first step of a two-stage recovery heat treatment or annealing process, followed by a second step of heating the at least a portion of the workpiece to a final target temperature by another annealing process.

One embodiment of the present disclosure provides an abrasion resistant steel having excellent hardness and impact toughness, and a manufacturing method therefor, the steel comprising, by wt %, 0.33-0.42% of C, 0.1-0.7% of Si, 0.6-1.6% of Mn, 0.05% or less of P, 0.02% or less of S, 0.07% or less of Al, 0.55-5.0% of Ni, 0.01-1.5% of Cu, 0.01-0.8% of Cr, 0.01-0.8% of Mo, 50 ppm or less of B, and 0.02% or less of Co, further comprising one or more selected from the group consisting of 0.02% or less of Ti, 0.05% or less of Nb, 0.05% or less of V and 2-100 ppm of Ca, and comprising the balance of Fe and other inevitable impurities, wherein C and Ni satisfy the following relation 1, and the microstructure comprises 95 area % or more of martensite and 5% or less of bainite (including 0%). [Relation 1] [C]×[Ni]≥0.231

A steel for high-strength aluminum clad substrate, comprising the following chemical elements by mass percent: C: 0.008-0.02%, 0<Si≤0.005%, Mn: 0.25-0.5%, P: 0.018-0.03%, Al≤0.005%, N: 0.0040-0.010%, Ti: 0.02-0.04%, O: 0.02-0.050%, and the balance being Fe and other inevitable impurities. The manufacturing method therefor comprises the steps of: (1) smelting and casting; (2) reheating: reheating a casting blank to 1180° C.-1250° C.; (3) rough rolling; (4) finish rolling; (5) coiling; and (6) cooling to room temperature. The steel for high-strength aluminum clad substrate has good strength and good plasticity.

A cooling device for a cooling operation of a flat metallic product is provided, the cooling device being located in an essentially vertical path including: a tank filled with a coolant bath defining a coolant surface, the tank including at least two openings, one on the upper surface and one on the bottom surface wherein the flat metallic product can pass through, the opening on the bottom surface being equipped with a sealing mean, two series of projecting devices, oriented essentially horizontally, on two opposite tank sides, the projecting devices being immersed in the coolant bath, each series of projecting devices having an uppermost projecting device being defined as the closest projecting device to the coolant surface, at least the uppermost projecting device on both sides being downwardly inclined of an angle of 20° to 40° compared to the horizontal.

A nickel-containing steel for low temperature service having a determined chemical composition of a Ni content of from 5.0 to 8.0%, in which the volume fraction of retained austenite in a region of 1.5 mm from a surface in the thickness direction is from 3.0 to 20.0% by volume, and the ratio of the hardness in a region of 1.0 mm from a surface in the thickness direction to the hardness in a region of ¼ of the thickness from a surface in the thickness direction is 1.1 or less, and a low-temperature tank using the nickel-containing steel for low temperature service.

A method of quenching a press hardenable steel is provided. The method includes an initial step of die quenching a part stamped within a stamping die followed by a partial quenching after the initial step of die quenching. In various methods, the press hardenable steel is a 36MnB5 grade steel and/or the initial step of die quenching is performed at a temperature of approximately 200° C.±10° C. in a die configured for 36MnB5 grade steel. At least one method further includes opening the die followed by the partial quenching, the partial quenching comprising spraying a cooling liquid onto the part to reduce a temperature of the part below approximately 130° C.±10° C., with the option of spraying to reduce the temperature of the part below approximately 100° C.±10° C.

A method of quenching a press hardenable steel is provided. The method includes an initial step of die quenching a part stamped within a stamping die followed by a partial quenching after the initial step of die quenching. In various methods, the press hardenable steel is a 36MnB5 grade steel and/or the initial step of die quenching is performed at a temperature of approximately 200° C.±10° C. in a die configured for 36MnB5 grade steel. At least one method further includes opening the die followed by the partial quenching, the partial quenching comprising spraying a cooling liquid onto the part to reduce a temperature of the part below approximately 130° C.±10° C., with the option of spraying to reduce the temperature of the part below approximately 100° C.±10° C.

A kit for forming a forge table and a forge pot for use therewith to carry a fuel for combustion so as to generate heat for heating a metallic workpiece. The forge table includes a tabletop with a central opening for receiving the forge pot. The forge pot includes a container for supporting the fuel and an air chamber fluidically communicated with the container and including an opening for fluidic communication with an external airflow source which generates an airflow for subsequent conveyance to the container for combusting the fuel. Each kit comprises interconnectable components made from rigid non-combustible sheet material. The airflow source is mounted in fluidic communication with the chamber and there is provided an intermediary valve component supported on the same mounting pegs carrying the source that is movably supported on the pegs so as to be operable to control passage of the airflow to the chamber.

Disclosed is a continuous thermal treatment line for a steel strip. The strip passes through consecutive thermal treatment chambers, is quickly cooled in at least one of the chambers by spraying liquid onto the strip, or by spraying a fluid made up of gas and liquid or spraying a combination of gas and liquid forming a mist. After quick cooling, a protective metal layer is deposited on the strip by dip coating. The cooling fluid strips iron oxides or other alloy elements contained in the steel to be treated, minimizing oxidation and reducing the oxides on the strip. Spray pressure and distance are chosen to facilitate the stripping property and the mechanical action of the sprayed fluid, reducing the layer of oxides on the strip. The temperature of the strip at the end of the cooling step is the temperature necessary for carrying out the desired treatment cycle.