HOT ROLLED WIRE MATERIAL EXCELLENT IN COLD FORGING PROPERTY AFTER SPHEROIDIZING TREATMENT, SPHEROIDIZING-ANNEALED STEEL WIRE HAVING EXCELLENT COLD FORGING PROPERTY, AND METHOD FOR PRODUCTION THEREOF

Title:

HOT ROLLED WIRE MATERIAL EXCELLENT IN COLD FORGING PROPERTY AFTER SPHEROIDIZING TREATMENT, SPHEROIDIZING-ANNEALED STEEL WIRE HAVING EXCELLENT COLD FORGING PROPERTY, AND METHOD FOR PRODUCTION THEREOF

Document Type and Number:

WIPO Patent Application WO/2006/088019

Kind Code:

A1

Abstract:

A hot rolled wire material which comprises 0.005 to 0.6 mass % of C, and has a structure wherein pseudo-pearlite, bainite and ferrite account for 10 vol % or more, 75 vol % or less and 60 vol % or less, respectively, and the relationship that the sum of (pseudo-pearlite + bainite + ferrite) ≥ 90 vol % is satisfied. A method for producing the above hot rolled wire material which comprises rolling a specific steel, followed by winding up at 750 to 1000&ring C, cooling the steel from an upper limit temperature of 750 to 1000&ring C to a lower limit temperature of 400 to 550&ring C at a cooling rate of 20&ring C/sec or higher, holding the steel for 20 sec or longer at 400 to 550&ring C, and then cooling the steel. A steel wire comprises 0.005 to 0.6 mass % of C, and has a structure wherein the distances between cementite particles have a value of (standard deviation/average) of 0.50 or less. A method for producing the steel wire includes subjecting the above hot rolled wire material to spheroidizing annealing.

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Inventors:

ISO ARATA (JP)
NISHIDA SEIKI (JP)
YAMASAKI SHINGO (JP)
KADA OSAMU (JP)

Application Number:

PCT/JP2006/302539

Publication Date:

August 24, 2006

Filing Date:

February 14, 2006

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)
ISO ARATA (JP)
NISHIDA SEIKI (JP)
YAMASAKI SHINGO (JP)
KADA OSAMU (JP)

International Classes:

C22C38/00; C21D8/06; C22C38/06; C22C38/54

Foreign References:

JP2000119809A	2000-04-25
JPH05156369A	1993-06-22
JPH01215924A	1989-08-29
JPH08295932A	1996-11-12
JP2000144306A	2000-05-26

Attorney, Agent or Firm:

Shiga, Masatake (Yaesu Chuo-k, Tokyo 53, JP)

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