HOLLOW SEAMLESS PIPE FOR HIGH-STRENGTH SPRINGS

Title:

HOLLOW SEAMLESS PIPE FOR HIGH-STRENGTH SPRINGS

Document Type and Number:

WIPO Patent Application WO/2010/131754

Kind Code:

A1

Abstract:

Provided is a hollow seamless pipe for high-strength springs. In the hollow seamless pipe, the decarburization in the inner and outer peripheral surfaces is extremely reduced, so that the outer and inner peripheral surface layers can be sufficiently hardened in the quenching step in producing springs. Thus, the hollow seamless pipe ensures sufficient fatigue strength of springs. The hollow seamless pipe consists of a steel which contains 0.2 to 0.7mass% of C, 0.5 to 3mass% of Si, 0.1 to 2mass% of Mn, more than 0 to 0.1mass% of Al, more than 0 to 0.02mass % of P, more than 0 to 0.02mass% of S, and more than 0 to 0.02mass% of N. The contents of C in the inner and outer peripheral surfaces of the hollow seamless pipe are 0.10mass % or more, and the thicknesses of the total decarburized layers present respectively in the inner and outer peripheral surfaces thereof are 200μm or less.

More Like This:

JP2000063999	FLAT Fe-BASE ALLOY POWDER FOR MAGNETIC SHIELD
JP2017048459	STEEL WIRE FOR MACHINE STRUCTURE COMPONENT

Inventors:

HATANO HITOSHI
TOYOTAKE KOTARO

Application Number:

PCT/JP2010/058233

Publication Date:

November 18, 2010

Filing Date:

May 14, 2010

Export Citation:

Click for automatic bibliography generation Help

Assignee:

KOBE STEEL LTD (JP)
SHINKO METAL PROD (JP)
HATANO HITOSHI
TOYOTAKE KOTARO

International Classes:

C22C38/00; C21D7/12; C21D8/06; C22C38/06; C22C38/58; F16F1/02

Foreign References:

JPH01247532A	1989-10-03
JP2007270349A	2007-10-18
JP2001247931A	2001-09-14
JP2007125588A	2007-05-24
JP2002194432A	2002-07-10
JP2007231353A	2007-09-13
JP2008150669A	2008-07-03
JP2009119030A	2009-06-04

Other References: