Title:
ROUND STEEL BAR MATERIAL TO BE CARBURIZED
Document Type and Number:
WIPO Patent Application WO/2022/158569
Kind Code:
A1
Abstract:
This round steel bar material to be carburized: has a chemical component composition comprising, by mass%, 0.17 to 0.28% of C, 0.15 to 0.25% of Si, 0.70 to 1.00% of Mn, 0.030% or less of P, 0.015 to 0.035% of S, 1.35 to 1.75% of Cr, 0.020 to 0.040% of Al, 0.0100 to 0.0200% of N, 0.01 to 0.10% of Nb as an optional element, 0.01 to 0.10% of Ti as an optional element, 0.0010 to 0.0040% of B as an optional element, and the balance Fe and inevitable impurities; and satisfies expression 1: (5 Si + 1.4 Mn + Cr)/C ≤ 18.6, expression 2: 42 Si + 11 Mn + 18 (Cu + Ni) + 24 Mo + 600 N - 200 Al ≥ 18.3, and expression 3: Mn/S ≥ 28. In a round cross-section along the diameter D of the round steel bar material to be carburized, the concentration of P at a D/4 deep position from the surface is 0.15% or less.
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Inventors:
TAKAO RYOTA (JP)
MAKINO KOMEI (JP)
SUGIURA TAKAYOSHI (JP)
FUKUDA NAOKI (JP)
IWAMOTO YUUTA (JP)
KAJINO TAKASHI (JP)
MIZUNO HIROYUKI (JP)
MAKINO KOMEI (JP)
SUGIURA TAKAYOSHI (JP)
FUKUDA NAOKI (JP)
IWAMOTO YUUTA (JP)
KAJINO TAKASHI (JP)
MIZUNO HIROYUKI (JP)
Application Number:
PCT/JP2022/002191
Publication Date:
July 28, 2022
Filing Date:
January 21, 2022
Export Citation:
Assignee:
AICHI STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/32
Domestic Patent References:
| WO2018180342A1 | 2018-10-04 |
Foreign References:
| JP2013234354A | 2013-11-21 | |||
| JP2014034683A | 2014-02-24 | |||
| JP2012136730A | 2012-07-19 | |||
| JP2011026688A | 2011-02-10 | |||
| JP2015134945A | 2015-07-27 | |||
| JP2017193767A | 2017-10-26 |
Attorney, Agent or Firm:
AICHI, TAKAHASHI, IWAKURA & ASSOCIATES (JP)
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