A system for cooling rolling mill material is provided that includes a conveyor system that receives rolling mill material and passes the rolling mill material through one or more cooling regions. A cooling structure that operates uniformly across the central and edge regions of the conveyor system. The cooling structure uses a first jet of air for cooling the central portion of the rolling mill material. A nozzle deck is positioned on the edge regions of the conveyor system produces a second of jet of air for cooling the edge portions of the rolling mill. The nozzle deck includes one or more adjustable nozzle structures for controlling the air flow produced by the second jet of air by varying the size of their air passage regions.

A method for improving the flatness of a rolled sheet or strip includes the application of differential cooling. A cooling agent can be selectively applied along the width of the strip. More cooling can be applied to the edges of the strip, where tension is greatest, to increase tension at the edges. The strip can be allowed to lengthen at these edges, which can improve flatness. In some embodiments, a closed loop flatness control system is used to measure the flatness of a strip and automatically adjust the differential cooling based on the measurement.

A cooling method for a rolling ingot of aluminum alloy after metallurgical homogenization heat treatment of said ingot and before hot rolling, characterized in that cooling by 30 to 150? C. is performed at a rate of 150 to 500? C./h, with a thermal differential of less than 40? C. throughout the treated portion of the ingot is disclosed. A facility allowing use of said method and said implementation is also disclosed.

A method of producing a steel material, wherein when a cooling apparatus having a plurality of cooling sections disposed side by side in a longitudinal direction of a steel material cools the steel material hot worked or cooled/reheated, the steel material is conveyed at a conveyance distance L.sub.o (m) satisfying Equation (1), in one direction along with the longitudinal direction of the steel material, in the cooling apparatus, wherein L.sub.o is defined as conveyance distance (m) of steel material, m is a natural number, and L.sub.h is defined as length (m) of cooling sections in longitudinal direction of steel material:

(m0.20)L.sub.hL.sub.o(m+0.20)L.sub.h(1).

A cooling method for a rolling ingot of aluminium alloy after metallurgical homogenization heat treatment of said ingot and before hot rolling, characterized in that cooling by 30 to 150? C. is performed at a rate of 150 to 500? C./h, with a thermal differential of less than 40? C. throughout the treated portion of the ingot is disclosed. A facility allowing use of said method and said implementation is also disclosed.

A method for improving the flatness of a rolled sheet or strip includes the application of differential cooling. A cooling agent can be selectively applied along the width of the strip. More cooling can be applied to the edges of the strip, where tension is greatest, to increase tension at the edges. The strip can be allowed to lengthen at these edges, which can improve flatness. In some embodiments, a closed loop flatness control system is used to measure the flatness of a strip and automatically adjust the differential cooling based on the measurement.

Systems and methods for improving the flatness of a rolled sheet or strip by the application of differential cooling. A cooling agent can be selectively applied along the width of the strip. More cooling can be applied to the edges of the strip, where tension is greatest, to increase tension at the edges. The strip can be allowed to lengthen at these edges, which can improve flatness. In some embodiments, a closed loop flatness control system is used to measure the flatness of a strip and automatically adjust the differential cooling based on the measurement.

An apparatus for cooling a steel sheet includes: an apparatus body provided spaced apart from a steel sheet in the conveying path of the steel sheet; and a cooling unit provided in the apparatus body to supply a cooling fluid. The apparatus body includes: a first edge body that faces a first edge portion extending a certain distance from one side end of the steel sheet toward the center of the steel sheet; and a second edge body that faces a second edge portion extending a certain distance from the other side end of the steel sheet toward the center of the steel sheet. The first and second edge bodies may have stepped cross-sections in a direction perpendicular to the conveying direction of the steel sheet.

The invention relates to a cooling method for a rolling ingot of aluminium alloy after metallurgical homogenization heat treatment of said ingot and before hot rolling, characterized in that cooling by 30 to 150 C. is performed at a rate of 150 to 500 C./h, with a homogeneity of less than 40 C. throughout the treated portion of the ingot.

The invention also relates to the facility allowing use of said method and said implementation.

A high carbon steel wire coil and a production method includes: smelting to obtain molten steel; continuously casting the molten steel to obtain a continuous casting bloom, and performing a reduction with reduction rate that is first high, then low, and then high applied to the continuous casting bloom during continuous casting; heating the continuous casting bloom and then performing blooming to obtain a billet; heating the billet and then performing rolling and air cooling to obtain the wire coil. By finely controlling the dynamic soft reduction parameters during continuous casting, and a reduction with reduction rate that is first high, then low, and then high applied to the continuous casting bloom, the present invention significantly improves the segregation and porosity issues in the central region of the bloom from the source.