SCREW OR TAPPING SCREW - NAT INST FOR MATERIALS SCIENCE

Title:

SCREW OR TAPPING SCREW

Document Type and Number:

WIPO Patent Application WO/2004/035839

Kind Code:

A1

Abstract:

A screw or a tapping screw, comprising a hyperfine structure steel having ferrite grains of 3 μm or smaller in average grain size and a nitrided layer on a surface part, wherein a strength is increased, a surface hardness is increased, and the surface hardness and an inside hardness are kept in balance, whereby a novel tapping screw and novel general screws can be provided.

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Inventors:

TORIZUKA SHIRO (JP)
NAGAI KOTOBU (JP)
KOMATSU TAKAFUMI (JP)
MIYASHITA NAOHISA (JP)
TAKAGI FUMITO (JP)
MATSUZAWA MASAAKI (JP)
MIYASAKA YOSHIMASA (JP)
HATANO YOSHIKI (JP)
FUJIMORI CHIAKI (JP)
OSAKA MASAYOSHI (JP)
UEMATSU MASAAKI (JP)
HAMA HAJIME (JP)

Application Number:

PCT/JP2003/013307

Publication Date:

April 29, 2004

Filing Date:

October 17, 2003

Export Citation:

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Assignee:

NAT INST FOR MATERIALS SCIENCE (JP)
TORIZUKA SHIRO (JP)
NAGAI KOTOBU (JP)
KOMATSU TAKAFUMI (JP)
MIYASHITA NAOHISA (JP)
TAKAGI FUMITO (JP)
MATSUZAWA MASAAKI (JP)
MIYASAKA YOSHIMASA (JP)
HATANO YOSHIKI (JP)
FUJIMORI CHIAKI (JP)
OSAKA MASAYOSHI (JP)
UEMATSU MASAAKI (JP)
HAMA HAJIME (JP)

International Classes:

F16B25/00; C21D1/06; C21D9/00; C22C38/00; C22C38/02; C22C38/04; C22C38/06; C22C38/58; C23C8/26; C23C8/32; F16B33/06; (IPC1-7): C21D9/00; C21D1/06; C22C38/00; C22C38/58; C23C8/32; F16B25/00; F16B33/06

Foreign References:

EP1054170A2	2000-11-22
JP2001234239A	2001-08-28
JP2001323932A	2001-11-22
EP1158065A1	2001-11-28

Other References: