Nippon Steel Sumitomo Metal Corporation

Nippon Steel Corporation

Masayuki Shibuya

Kouichi Takeuchi

Hayato Kita

Kazuyoshi Fujisawa

Takashi Maeda

Hideya Kaminaka

Kazuhiko Adachi

Kentarou Yoshida

Shuuji Yoshida

Syuji Yoshida

Yuuichi Fukumura

Tomoyuki Sukawa

Shinnya Yamamoto

Daisaku Arizono

Katsuhiko Taketsu

A metal plate for laser processing (such as a stainless steel plate or a titanium plate) and preferably an austenitic stainless steel plate suitable for use as a metal mask or the like which undergoes fine processing with a laser has an average grain diameter d (&#x3bc;m) and a plate thickness t (&#x3bc;m) which satisfy the equation d&#x2264;0.0448&#xb7;t&#x2212;1.28.

Metal plate for laser processing and method for producing stainless steel plate for laser processing

The clad material comprises outer layers each consisting of Ni or Ni alloy and a base layer consisting of Cu or Cu alloy, and is characterized in that peeling-off at a clad boundary is not recognized in cross section observation made after the clad material has been subjected to a 90&#xb0; reverse bend test ten times, and the number of reverse bend cycles before rupture is 17 cycles or more. The clad material has with both of excellent corrosion resistance against electrolytic solution and high electric conductivity.

Clad material

Martensitic mixed phase stainless steel, which has in well balance between excellent strength and formability and excellent fatigue properties, and is inexpensive, and suitable for spring members, has: a chemical composition comprising C: 0.1-0.4%, Si: at most 2.0%, Mn: 0.1-6.0%, Cr: 10.0-28.0%, N: at most 0.17%, the remainder of Fe and impurities, and a metallurgical structure which includes a ferrite phase and a martensitic phase, and also a retained austenite phase of 5 volume % or less if necessary, and which satisfies a relationship of C/C&#x2267;5.0 where an average value Cof C content existing in the ferrite phase, and an average value Cof C content existing in the martensite.

Stainless steel and method for manufacturing same

A high-Si content austenitic stainless steel, which exhibits stable acid resistance and excellent corrosion resistance in high-temperature and concentrated nitric acid, has a chemical composition comprising: C: at most 0.04%; Si: 2.5-7.0%; Mn: at most 10%; P at most 0.03%; S: at most 0.03%; N: at most 0.035%; sol. Al: at most 0.03%; Cr: 7-20%; Ni: 10-22%; optionally, one or more types selected from Nb, Ti, Ta and Zr: 0.05-0.7% in total; and the remainder being Fe and impurities, wherein a total amount of Btype inclusions measured by a method according to JIS G0555 (2003) Annex 1 'Microscopic Testing for the Non-Metallic Inclusions on the Point Counting Principle' is not more than 0.03% by area %.

Method for manufacturing high-Si austenitic stainless steel

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Tokyo, Japan

Masayuki Shibuya