Kawasaki Steel Corporation

Kubota Corporation

Tadashi Naito

Hisashi Hiraishi

Akira Shinosaki

Namio Suganuma

Kunio Kitamura

Kiyoshi Takagi

Osamu Nakatani

Tohru Kawai

Masamitsu Obashi

Toshio Inoue

This invention effectively smoothens the steel sheet surface after final cold rolling by removing oxidation scale produced on the steel sheet surface in the production steps of grain oriented silicon steel sheets, particularly after intermediate annealing and at a stage before the final cold rolling, or further forming grooves onto the steel sheet surface along the rolling direction, and hence can utilize high speed tandem rolling for the final cold rolling, whereby the production of grain oriented silicon steel sheets having excellent magnetic properties is realized in a high productivity.

Method of producing grain oriented silicon steel sheets having improved

A skid beam for use in a walking beam type heating furnace which has operating temperature exceeding 1000.degree. C. comprises a hollow skid pipe of heat resistant alloy, skid buttons provided upright on the skid pipe and arranged axially thereof at a predetermined spacing, and a refractory lining covering the outer peripheral surface of the skid pipe and each of the skid buttons over the base portion thereof toward its upper portion. Each of the skid buttons comprises a first member attached to the skid pipe and made of a heat-resistant alloy, and a second member to be brought into contact with the material to be heated. The second member is made of a composite material composed of a heat-resistant alloy and ceramic particles dispersed therein in an amount of 30 to 70% by weight based on the composite material. The skid button has a height exceeding 120 mm. The lining portion covering the skid button over the base portion thereof toward its upper portion has a thickness so as not to give a temperature difference of 40.degree. C. between the top of the skid button and the interior of the furnace.

Skid beam for heating furnaces of walking beam type

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Kurashiki, Japan

Tadashi Naito