Title:
ABRASION-RESISTANT STEEL MATERIAL EXCELLENT IN FATIGUE CHARACTERISTICS AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2014/207879
Kind Code:
A1
Abstract:
An abrasion-resistant steel material with excellent extreme fatigue characteristics having a chemical composition containing, in terms of mass%, 0.30 to 0.90% C, 0.05 to 1.00% or less Si, 0.10 to 1.50% Mn, 0.003 to 0.030% P, 0.001 to 0.020% S, 0.10 to 0.70% Nb, and furthermore containing, as required, one or more of 1.50% or less Cr, 0.50% or less Mo, 0.50% or less V, 2.00% Ni, 0.10% or less Ti, 0.0050% or less B, the remainder being Fe and unavoidable impurities, the abrasion-resistant steel material having a metal structure after thermal refining in which Nb-containing carbide has been dispersed, and having the number of Nb-containing carbide particles with a particle diameter of 1.0 μm or more adjusted to 200/mm2 or more and a maximum particle diameter Dmax of the Nb-containing carbide particles in 103mm3 as estimated by an extreme value statistics method adjusted to 18.0 μm or less.
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Inventors:
KUBO HIRONORI (JP)
Application Number:
PCT/JP2013/067732
Publication Date:
December 31, 2014
Filing Date:
June 27, 2013
Export Citation:
Assignee:
NISSHIN STEEL CO LTD (JP)
International Classes:
C22C38/00; C21D9/00; C22C38/12; C22C38/54; C21D9/46
Foreign References:
| JP2010216008A | 2010-09-30 | |||
| JP2010248630A | 2010-11-04 | |||
| US20120024077A1 | 2012-02-02 | |||
| JP2013136820A | 2013-07-11 | |||
| JPS62142726A | 1987-06-26 | |||
| JPS63169359A | 1988-07-13 | |||
| JPH01142023A | 1989-06-02 | |||
| JP2010216008A | 2010-09-30 |
Other References:
YUKITAKA MURAKAMI ET AL.: "Critical Review of the Inclusion Rating by JIS-G-0555 Method and New Inclusion Rating Based on Statistics of Extreme and Its Applications", JOURNAL OF THE IRON & STEEL INSTITUTE OF JAPAN, vol. 79, no. 12, December 1993 (1993-12-01), pages 1380 - 1385, XP055295092
YUKITAKA MURAKAMI: "Prediction of -yarea of Maximum Inclusion contained in Unit Volume", 1993, YOKENDO CO., LTD, article "Metal Fatigue: Effects of Small Defects and Inclusions"
YUKITAKA MURAKAMI: "Prediction of -yarea of Maximum Inclusion contained in Unit Volume", 1993, YOKENDO CO., LTD, article "Metal Fatigue: Effects of Small Defects and Inclusions"
Attorney, Agent or Firm:
KOMATSU, TAKASHI (JP)
Komatsu Quantity (JP)
Komatsu Quantity (JP)
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