Nippon Steel Corporation

Nippon Steel & Sumikin Stainless Steel Corporation

Satoshi Akamatsu

Yoshikazu Matsumura

Shigenori Tanaka

Takashi Fujita

Masanori Hashimoto

Junichi Hamada

Masao Kikuchi

Shigeru Ogawa

Masafumi Miyazaki

Ken Kimura

Toshiaki Mizoguchi

Kazuo Koyama

Yoshiyuki Ueshima

Hideki Oka

Atsuhiko Yoshie

Hiroyuki Nakashima

Hidemaro Takeuchi

Masaaki Fujioka

Masayuki Tendo

Kiyomi Shio

Fumio Fudanoki

Yoshio Morimoto

Yoshimori Fukuda

Kiyoshi Nishioka

Yoshiyuki Watanbe

Shinichi Shimomura

Toshihiko Sugimoto

A ferritic stainless steel sheet excellent in press formability and operability, characterized by: containing appropriate amounts of C, N, Cr, Si, Mn, P, S, Al, Ti and V, with the balance consisting of Fe and unavoidable impurities; having a solid lubricating film or films on one or both of the surfaces; and having a ratio Z, defined as Z=Z/Z, of less than 0.5, a tensile strength of 450 MPa or less and an average r-value of 1.7 or more, wherein Zis a friction coefficient of the surface of a solid lubricating film and Zthat of the surface of a reference material coated with neither a coating nor lubricating oil. In the ferritic stainless steel sheet, the amounts of Sol-Ti and Insol-V may be regulated to appropriate ranges, wherein Sol-Ti means the amount of Ti existing in the state of solid solution in steel and Insol-V means the amount of V existing in the state of precipitation in steel.

Ferritic stainless steel sheet excellent in press formability and workability and method for production thereof

There is provided a stainless steel sheet material, used for a semiconductor manufacturing device, to which it difficult for fine dust to be attached and from the surface of which the attaching dust can be easily washed away. Also, there is provided a method of manufacturing the stainless steel sheet material. A stainless steel sheet material characterized in that: the number of pinholes, the area of each pinhole exceeding 0.25 mm,, in the area of 10 cm,on the surface of a skinpass-rolled stainless steel sheet material is not more than 10; and the average surface roughness Ra on the center line in the direction perpendicular to the rolling direction is not more than 0.15 &mgr;m. A method of manufacturing a stainless steel sheet material comprising the steps of: annealing a stainless steel cold-rolled sheet in a heat-treatment furnace having no support rollers in a temperature region exceeding 600&deg; C. in a reducing atmosphere; and conducting skinpass rolling on the annealed stainless steel sheet material with a water soluble lubricant so that the average surface roughness Ra on the center line in the direction perpendicular to the rolling direction is not more than 0.15 &mgr;m.

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Futtsu, Japan

Satoshi Akamatsu