HIGH-STRENGTH SELF-TAPPING SCREW AND PROCESS FOR PRODUCING THE SAME

Title:

HIGH-STRENGTH SELF-TAPPING SCREW AND PROCESS FOR PRODUCING THE SAME

Document Type and Number:

WIPO Patent Application WO/2006/137460

Kind Code:

A1

Abstract:

This invention provides a self-tapping screw that the molded product body has an ultrafine grain ferrite texture having an average particle diameter of not more than 2 μm in at least one cross-section in an arbitrary direction and at least one of three films of a metal plating film, a chromated film, and an electrodeposited film is formed on the surface of the molded product body. The self-tapping screw is a high-strength self-tapping screw that, unlike the prior art technique, can realize both excellent screwing properties and torsional strength without carburizing/quenching and tempering.

More Like This:

JPS5517779	SETTING METAL FITTINGS OF JOINT FOR LIQUID CONDUIT PIPE
JPH01255621	TREATMENT FOR IMPROVING INTERGRANULAR CORROSION RESISTANCE

Inventors:

TORIZUKA SHIRO (JP)
NAGAI KOTOBU (JP)
MURAMATSU EIJIRO (JP)

Application Number:

PCT/JP2006/312450

Publication Date:

December 28, 2006

Filing Date:

June 21, 2006

Export Citation:

Click for automatic bibliography generation Help

Assignee:

NAT INST FOR MATERIALS SCIENCE (JP)
TORIZUKA SHIRO (JP)
NAGAI KOTOBU (JP)
MURAMATSU EIJIRO (JP)

International Classes:

C21D8/00; B21B1/16; B21B3/00; C22C38/00; C22C38/06; F16B25/00; F16B33/06; F16B35/00

Foreign References:

JP2004060046A	2004-02-26
JP2004137560A	2004-05-13
JP2001247937A	2001-09-14
JP2003130024A	2003-05-08

Attorney, Agent or Firm:

Nishizawa, Toshio (11-1 Minami-Aoyama 6-chome, Minato-k, Tokyo 62, JP)

Download PDF:

View/Download PDF PDF Help

Previous Patent: LIGHT DIFFUSING PLATE AND LIGHTING DEVICE USING IT

Next Patent: METHOD FOR MANUFACTURING SUBSTRATE FOR ELECTRONIC DEVICE, SUBSTRATE FOR ELECTRONIC DEVICE, ELECTRONI...