OIL-TEMPERED WIRE, METHOD FOR MANUFACTURING THE SAME, AND SPRING

Japanese Patent JP2010163689

A

To provide an oil-tempered wire which has both of high fatigue strength and toughness after nitriding treatment; a method for manufacturing the same; and a spring manufactured by using the oil-tempered wire.

The oil-tempered wire has a tempered martensite structure. When the oil-tempered wire is subjected to gas nitriding processing at 450°C for two hours, a lattice constant of a nitride layer formed in a surface part of the wire becomes 2.881-2.890 Å. When the oil-tempered wire is heated at 450°C for two hours, the tensile strength becomes 1,975 MPa or more, the flow stress becomes 1,769 MPa or more and a draw ratio becomes more than 40%. This oil-tempered wire is obtained by subjecting a steel wire which has been drawn to a quenching step and a two-step tempering process.

COPYRIGHT: (C)2010,JPO&INPIT

JP2692089	[Title of Invention] Powder Molded Magnetic Material
JPH0639619	[Title of the Invention] A method for producing a thin steel sheet having excellent moldability
WO/2009/047926	PEARLITE STEEL RAIL OF HIGH INTERNAL HARDNESS TYPE EXCELLENT IN WEAR RESISTANCE, FATIGUE FAILURE RESISTANCE AND DELAYED FRACTURE RESISTANCE AND PROCESS FOR PRODUCTION OF THE SAME

FUJINO YOSHIRO
KAWABE NOZOMI
SHIAKU TAKASHI
YAMAO NORITO
MURAI TERUYUKI

JP2010043173A

July 29, 2010

February 26, 2010

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SUMITOMO ELECTRIC INDUSTRIES
SUMITOMO DENKO STEEL WIRE KK

C22C38/00; C21D1/06; C21D1/18; C21D7/06; C21D8/06; C21D9/52; C22C38/24; C22C38/52; F16F1/02

JP2004315968A	2004-11-11
JP2004315967A	2004-11-11
JP2005120479A	2005-05-12
JP2004190116A	2004-07-08
JP2003306747A	2003-10-31
JP2003213372A	2003-07-30
JP2003105498A	2003-04-09

Hiroshi Yamano

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