Nippon Steel Corporation

Kunihiko Komiya

Kazuo Koyama

Hiroshi Takechi

Hiroshi Katoh

Mitsunobu Abe

Matsuo Usuda

Hiromi Toyota

Tsuyoshi Kawano

Hisashi Gondo

Kazuo Namba

Koji Ozaki

Disclosed are processes for producing cold rolled steel sheets and strips having excellent press formability and ageing property by a continuous annealing method, in which specific heating cycles are adopted in combination with steel compositions with lowered phosphorus contents.

Process for producing cold rolled steel sheets having excellent press

Anti-vibration steel materials containing not more than 0.1% of carbon and not more than 0.5% of manganese and having an .alpha. value of not lower than 55, said value being a product of the yield point or stress at 0.2% strain and the grain size number, and a method for producing the same which comprises hot rolling a steel slab, billet or bloom containing not more than 0.1% of carbon, not more than 0.5% of manganese, giving not more than 10% of strain to the hot rolled steel, annealing the hot rolled steel thus strain given at a temperature not lower than its recrystallization temperature but not higher than its A.sub.3 transformation point for at least one minute and controlling the .alpha. value as defined herein to a value not more than 55.

Anti-vibration steel material and a production method therefor

A vibration damping steel containing C .ltoreq. 0.10% and Mn .ltoreq. 0.40% as the essential constituents and having a lower yield point or 0.2% proof stress of 7-28kg/mm.sup.2 with the degree of refinement of the steel being not less than 0.18 while still maintaining the specific gravity at 7.859g/cm.sup.3 or less, and a process for producing the same. This steel material is particularly suited for use in items which to produce and transmit vibration and noise.

Vibration damping steel material and process for producing the same

A method for producing a high-strength cold rolled steel sheet or strip is disclosed. Steel comprising

Method for producing high-strength cold rolled steel sheet

Growing community of inventors

Kimitsu, Japan

Kunihiko Komiya