Title:
STEEL FOR CARBURIZING OR CARBONITRIDING APPLICATIONS
Document Type and Number:
WIPO Patent Application WO/2012/102233
Kind Code:
A1
Abstract:
A steel for carburizing or carbonitriding applications, comprising, in mass%, 0.1-0.3% of C, 0.01-0.15% of Si, 0.6-1.5% of Mn, 0.012-0.05% of S, 0.5-2.0% of Cr, 0.030-0.050% of Al, 0.0006-0.0025% of Ti, 0.010-0.025% of N, 0.0006-0.0012%% of O, optionally at least one element selected from Mo in an amount of 0.5% or less, Ni in an amount of 1.5% or less and Cu in an amount of 0.4% or less, and a remainder made up by Fe and impurities, wherein the impurities contain 0.025% or less of P and 0.003% or less of Nb, and the following formulae: [-5.0 ≤ log(Ti×N) ≤ -4.4] and [-12.5 ≤ log(Al2×O3) ≤ -11.7] are fulfilled. The steel for carburizing or carbonitriding applications exhibits excellent bending fatigue strength after being subjected to a hot forging procedure and subsequently subjected to a carburizing or carbonitriding procedure, and is suitable as a material steel for a component that is roughly molded by hot forging, such as a gear, a pulley and a shaft.
Inventors:
DAITOH YOSHIHIRO (JP)
Application Number:
PCT/JP2012/051333
Publication Date:
August 02, 2012
Filing Date:
January 23, 2012
Export Citation:
Assignee:
SUMITOMO METAL IND (JP)
DAITOH YOSHIHIRO (JP)
DAITOH YOSHIHIRO (JP)
International Classes:
C22C38/00; C22C38/28; C22C38/50; C23C8/22; C23C8/32
Foreign References:
| JP2010180455A | 2010-08-19 | |||
| JP2011157597A | 2011-08-18 | |||
| JP2011225897A | 2011-11-10 |
Attorney, Agent or Firm:
SUGIOKA, Kanji et al. (JP)
Sugioka Miki 2 (JP)
Sugioka Miki 2 (JP)
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Claims: