HIGH-CARBON CHROMIUM BEARING STEEL, AND PROCESS FOR PRODUCTION THEREOF

WIPO Patent Application WO/2012/081229

A1

A production process comprising heating a material to be treated to a temperature higher than an Ac1 transformation point in a carburizing atmosphere, then slowly cooling the material to a temperature (T) that fulfills formula (1) at a cooling rate of 70˚C/Hr or less while keeping the carburizing atmosphere, and subsequently cooling the material in an oxidizing atmosphere: Ar1 - 20 ≥ T (˚C) ≥ 300˚C ···(1). According to the process, a high-carbon chromium bearing steel in which the depth of a decarburized layer or an overcarburized layer in the surface of the steel material is 0-0.2 mm and which can be cut at low cost and has excellent machinability can be produced with high efficiency using a steel pipe that has been subjected to a hot pipe making procedure.

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OOTSUKA SYUNICHI (JP)
NISHIYAMA YOSHITAKA (JP)
KAWAKAMI TADASHI (JP)

PCT/JP2011/006940

June 21, 2012

December 13, 2011

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SUMITOMO METAL IND (JP)
OOTSUKA SYUNICHI (JP)
NISHIYAMA YOSHITAKA (JP)
KAWAKAMI TADASHI (JP)

C21D6/00; C21D1/06; C21D1/26; C21D1/32; C21D1/76; C22C38/00; C22C38/38; C23C8/22; F16C33/32; F16C33/34; F16C33/62; F16C33/64; C21D9/08

WO1999034023A1

1999-07-08

JPH04136117A	1992-05-11
JPH03281723A	1991-12-12
JPH03126858A	1991-05-30
JP2003027144A	2003-01-29
JPH0254717A	1990-02-23
JPH03126858A	1991-05-30
JPH05148611A	1993-06-15
JPH04136117A	1992-05-11
JP2003027144A	2003-01-29
JP2000319723A	2000-11-21
JPH0578734A	1993-03-30
JPH032327A	1991-01-08

See also references of EP 2653569A4

MORI, Michio et al. (JP)
Woods Michio (JP)

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