Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Other

Babcock-hitachi Kabushiki Kaisha

Hiroyuki Mimura

Yuki Motegi

Takashi Oosawa

Takao Mukai

Kazutoshi Takeda

Jun Maki

Hiroyasu Fujii

Kazuhiro Miyamoto

Tetsu Satoh

Kunihiro Enomoto

Takashi Sato

Atsushi Tanaka

Shuichi Yamazaki

Toshio Fujita

Toshio Fujii

Shinya Hayashi

Masahiro Ohgami

Kohji Tamura

Toshiyuki Ogata

Akira Akagi

Yoshihisa Kariyazono

Hisataka Uto

Katsukuni Hashimoto

Toshiyuki Sasaki

Hirotaka Sato

Yoshihiro Miyajima

Nobuki Yoshizaki

Yusuke Kanto

A non-oriented electrical steel sheet according to one embodiment of the present invention includes a base metal steel sheet, and a composite coating film composed of a Zn-containing phosphate and an organic resin, the composite coating film being formed on a surface of the base metal steel sheet, wherein: a content of Zn in the composite coating film is 10 mg/mor more per side; and the product of an amount of oxygen in the base metal steel sheet and a sheet thickness of the base metal steel sheet is 50 ppm·mm or less.

Non-oriented electrical steel sheet and method for producing same

A non-oriented electrical steel sheet according to one embodiment of this invention includes a base metal steel sheet and a composite coating film composed of a Zn-containing phosphate and an organic resin, the composite coating film being formed on a surface of the base metal steel sheet. A molar ratio of Zn to all metal components in the composite coating film is 10 mol % or more, and after the non-oriented electrical steel sheet is boiled for 20 minutes in boiled distilled water, an amount of soluble Zn in the distilled water is 1.0 mg/mor more. The method for determining the amount of soluble Zn is in accordance with JIS K 0102: 2016 'Testing Methods for Industrial Wastewater', 53.3 “ICP Emission Spectroscopy”.

In cold-rolling a steel sheet coil, when a tail end portion of a steel sheet coil () is wound around a tension reel () prior to second-pass rolling after the completion of first-pass rolling, the tail end portion is heated to a temperature within a range of not lower than 50&#xb0; C. nor higher 350&#xb0; C. with a heater disposed between a rolling stand () and the coil tail end-side tension reel ().

Method of cold-rolling steel sheet and cold-rolling facility

Dented steel pipe

The invention produces a grain-oriented electrical steel sheet having a primary recrystallization structure in which Goss-oriented crystal grains and crystal grains having a coincidence orientation relationship to the Goss orientation are aligned in the rolling direction. It is characterized heating a slab containing, in mass %, C: 0.025 to 0.10%, Si: 2.5 to 4.5%, Mn: 0.03 to 0.55%, and Al: 0.007 to 0.040% to 1,100 to 1,450&#xb0; C. or greater; hot rolling the slab to obtain a hot-rolled sheet; annealing the hot-rolled sheet; cold rolling the annealed sheet multiple times with a split-housing reversible cluster rolling mill; and subjecting the cold-rolled sheet to primary recrystallization annealing followed by secondary recrystallization annealing, in which method: (a) a first cold rolling or first and second cold rollings are performed using a small-diameter work roll of 55 mm to less than 105 mm diameter; (b) a second or third cold rolling to a penultimate cold rolling are performed using a large-diameter work roll of 105 mm to less than 150 mm diameter; and (c) a final cold rolling is conducted using a small work roll of a diameter smaller than the diameter of the large-diameter work roll.

Method of producing grain-oriented electrical steel sheet

Ferritic heat-resistant steel having excellent high temperature strength

Steel product covered with high-strength polyolefin

Growing community of inventors

Tokyo, Japan

Hiroyuki Mimura