Nippon Steel Corporation

Hiroshi Sato

Toshimi Tarui

Toshihiko Takahashi

Tadashi Matsui

Katsunori Nashimoto

Hiroshi Kaneda

Osamu Tanaka

Akira Sakaida

Hiromichi Koshiishi

Hitoshi Tashiro

Syoji Sasaki

Kunio Mori

High strength, ultra fine steel wire having excellent workability in

For improving the properties of a glass film on a grain-oriented electrical steel sheet, the annealing separator applied on a decarburized steel sheet is prepared by: calcining at a high temperature to reduce the activity thereof; hydrating only on the outermost layer of MgO particles; and adding a Ti, B, or S compound to MgO.

Process for producing grain-oriented electrical steel sheet having

A method of directly softening a rolled machine structural steel is provided. This method is characterized by the fact that it comprises the steps of:

Method of directly softening rolled machine structural steels

A method of softening a rolled medium carbon machine structural steel is provided. This method is characterized by:

Method for softening rolled medium carbon machine structural steels

A method of cooling a rod delivered successively from a hot rolling mill while transferring it. The method involves coiling the rod into rings, forming the rings into a densely packed coil in which the centers of the rings are slightly offse, conveying the densely packed coil through an enclosed space, and progressively cooling the coil while keeping the temperature differences within the cross-section of the coil perpendicular to the length thereof at a minimum. This is done by adjusting the gaseous heat transfer medium within the enclosed space to keep the temperature of the external surface of said cross-section of the coil substantially uniform, during the course of conveying the coil, and vertically dropping the rings of the coil at least once for accelerating the release of heat from the core portions of the densely packed part of the coil along each edge of the coil.

Method of cooling hot-rolled wire rods

An apparatus for cooling a rod delivered successively from a hot rolling mill while transferring it. The apparatus has a laying reel for forming the rod into successive rings, and a conveyor having a coil receiving portion for receiving the rings and forming them into a densely packed coil having a plurality of overlapped rings with the centers of the rings offset in a transferring direction. The conveyor has at least one step for loosening the coil when it is conveyed over the step. An enclosure is provided for enclosing. The sections of the conveyor between which the step is located. The enclosure has stirring devices for keeping the gaseous heat transfer medium within the enclosure at substantially uniform temperatures, which progressively decrease in the direction of movement of the conveyor. A plurality of coolant nozzles are provided at the step for blowing coolant on to the back of the vertically dropping rings.

Apparatus for cooling hot-rolled wire rods

A box annealed steel strip having small strains is produced by: pretreating a steel strip in such a manner that a side edge portion thereof is thermally treated under a different condition from another condition under which the remaining portion, including an opposite side edge, thereof is thermally treated, so as to cause the longitudinal length of the side edge portion to be different from that of the remaining portion; winding the pretreated steel strip under tension to form a coil in such a manner that greater tensile stresses are produced in the other one of the side edge portion and the remaining portion, which one has a longitudinal length smaller than that of the other one, than those produced in the other one; placing the coil on a base plate so that a side edge included in the portion having the greater stresses comes into contact with the base plate, and; box annealing the coil on the base plate in a box annealing furnace.

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Kamaishi, Japan

Hiroshi Sato