Kawasaki Steel Corporation

Ko Matsumura

Michiro Komatsubara

Atsuhito Honda

Toshio Irie

Keiji Nishimura

Hiroto Nakamura

Toshio Suzuki

Takahiro Kan

Hiroshi Shimanaka

Isao Matoba

Yoh Shimizu

Tomomichi Goto

Takuichi Imanaka

Isamu Goto

A semi-process non-oriented electromagnetic steel strip having low core loss and high magnetic permeability is provided which consists essentially of, in % by weight, up to 0.02% of C, 0.2 to 2.0% of Si, 0.1 to 0.6% of Al, 0.02 to 0.10% of P, 0.5 to 1.5% of Mn, 0.1 to 1.0% of Ni, and optionally up to 0.6% of Cu, and optionally 0.01 to 0.2% of Sb and/or Sn, and a balance of iron and inevitable impurities. Magnetic properties are further improved when it is manufactured by hot rolling a slab having the composition at a temperature of from 1,100.degree. to 1,200.degree. C., completing hot finish rolling at a temperature of at least 700.degree. C. in the austenite region, annealing the strip at a temperature from 800.degree. to 880.degree. C. for at least one hour, cold rolling and annealing the strip, and optionally, skin pass rolling with a reduction of 2 to 12%.

Semi-process non-oriented electromagnetic steel strip having low core

A semi-processed non-oriented electromagnetic steel strip having low core loss and high magnetic permeability is provided which consists essentially of, in % by weight, up to 0.02% of C, 0.2 to 2.0% of Si, 0.1 to 0.6% of Al, 0.02 to 0.10% of P, 0.5 to 1.5% of Mn, 0.1 to 1.0% of Ni, and optionally up to 0.6% of Cu, and optionally 0.01 to 0.2% of Sb and/or Sn, and a balance of iron and inevitable impurities. Magnetic properties are further improved when it is manufactured by hot rolling a slab having the composition at a temperature of from 1,100.degree. to 1,200.degree. C., completing hot finish rolling at a temperature of at least 700.degree. C. in the austenite region, annealing the strip at a temperature from 800.degree. to 880.degree. C. for at least one hour, cold rolling and annealing the strip, and optionally, skin pass rolling with a reduction of 2 to 12%.

Semi-processed non-oriented electromagnetic steel strip having low core

When producing a semi-process electromagnetic steel sheet by a series of process steps including cold rolling, annealing and skin pass rolling, in this order, a hot rolled sheet containing not more than 0.02 wt. % of C, 0.1 to 1.0 wt. % of Si, 0.5 to 1.5 wt. % of Mn, 0.1 to 0.6 wt. % of Al and 0.02 to 0.10 wt. % of P and optionally containing at least one of 0.1 to 1.0 wt.% of Ni, 0.01 to 0.2 wt. % in sum of Sb and/or Sn, and not more than 0.6 wt. % of Cu, the semi-process electromagnetic steel sheet excellent in magnetic properties along the circumferential direction is obtained when a roll in which a number of craters each having a diameter of an equivalent circle of the crater of not larger than 200 microns are formed on the roll surface and a level difference between the most protuberant and recessed portions is in the range from 5 to 40 miclons, with the number of craters per square centimeter being not less than 1000 and none of the craters overlapping with an adjoining crater or craters, is used as the roll for skin pass rolling. The semi-process electromagnetic steel sheet excellent in anti-sticking properties and in magnetic properties along the rolling direction is obtained when a roll in which a number of craters each having a diameter of an equivalent circle of the crater of not larger than 500 microns are formed on the roll surface and a level difference between the most protuberant and most recessed portions of the crater is in the range from 5 to 40 microns, with the number of the craters per square centimeter being in the range from 1 to 400 and none of the craters overlapping with an adjoining crater or craters, is used as the roll for the skin pass rolling.

Method for producing an electro-magnetic steel sheet

A cold rolled non-oriented electrical steel sheet having a low iron loss is disclosed. The steel sheet consists of not more than 0.02% of C, 0.1-3.5% of Si, not more than 1.0% of Al, 0.1-1.0% of Mn, 0.03-0.40% of Sn and the remainder being substantially Fe.

Cold rolled non-oriented electrical steel sheet

Non-oriented silicon steel sheets having an excellent electromagnetic property is obtained by annealing a hot rolled steel sheet containing not moe than 0.02% of C, 0.5-3.5% of Si, 0.1-1.0% of Al, 0.1-1.0% of Mn, not more than 0.007% of S and 0.005-0.30% of Sb at a temperature of 700.degree.-950.degree. C., cold rolling the annealed sheet, and annealing the cold rolled sheet at a temperature of 750.degree.-1,000.degree. C.

Method of producing non-oriented silicon steel sheets having an

Single-oriented electrical steel sheets having a high magnetic induction are produced by combining specifically limited conditions in the composition of raw material, the final cold rolling reduction rate and in the secondary recrystallizing annealing.

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Chiba, Japan

Ko Matsumura