Nippon Steel Corporation

Kiyoshi Tanaka

Masafumi Okamoto

Yozo Suga

Motoharu Nakamura

Minoru Kitayama

Takahide Shimazu

Morio Shiozaki

Kichi Nakazawa

Kikuo Takashina

Takayasu Sugiyama

Minoru Motoyoshi

Masfumi Okamoto

Tadashi Sakazaki

Tatsuo Oya

A method for preventing edge cracks in a grain oriented silicon steel sheet produced from a continuously cast slab containing 2.5 to 4.0% silicon. This method is carried out with a controlled reduction rate in a rough rolling mill and/or with an adjusted reduction by a pair of edge rolls of an edger.

Method for preventing the edge crack in a grain oriented silicon steel

A method for treating a steel slab containing 2.5 to 4% Si to a temperature not lower than 1260.degree. C. in a continuous heating furnace of the walking-beam type, comprising; charging the slabs into the continuous heating furnace through its charge inlet, transferring the slabs by means of walking-beams in the furnace with the rear end of a preceding slab substantially contacting a front end of a subsequent slab under the condition that the contact time of the slab with fixed beams is not more than three times longer than the contact time of the slab with the transfer beams, and separating the adjacent slabs with a space sufficient to permit remelting of solidified slag adhered between the adjacent slabs approaching the extraction outlet of the furnace.

Method for heating a silicon-containing steel slab in a walking-beam

A steel slab containing silicon for use as an electrical steel sheet and strip and having no blister occurrence in the final product manufactured by continuous casting, characterized in that said slab comprises 2.5 - 4.0 wt.% of silicon, less than 0.04% of aluminium, less than 3 ppm of hydrogen or less than 3 ppm of hydrogen together with less than 80 ppm of oxygen, and less than [Al(%) .times. 10.sup.3 + 50] ppm of nitrogen, with the remainder being essentially iron.

Steel slab containing silicon for use in electrical sheet and strip

Method for producing a grain-oriented electrical steel sheet or strip having uniform magnetic and film properties said method comprising applying an annealing separator containing one or more metal nitrides, such as, chromium nitride, titanium nitride and vanadium nitride to the steel sheet and annealing the steel sheet at a temperature not lower than 1,100.degree.C.

Method for producing a grain-oriented electrical steel sheet using

Growing community of inventors

Himeji, Japan

Kiyoshi Tanaka