AUSTENITIC HEAT-RESISTANT CAST STEEL HAVING EXCELLENT THERMAL FATIGUE CHARACTERISTICS, AND EXHAUST SYSTEM COMPONENT COMPRISING SAME

Title:

AUSTENITIC HEAT-RESISTANT CAST STEEL HAVING EXCELLENT THERMAL FATIGUE CHARACTERISTICS, AND EXHAUST SYSTEM COMPONENT COMPRISING SAME

Document Type and Number:

WIPO Patent Application WO/2016/052750

Kind Code:

A1

Abstract:

This austenitic heat-resistant cast steel having excellent thermal fatigue characteristics contains, by mass, 0.3–0.6% C, 0.5–3% Si, 0.5–2% Mn, 15–30% Cr, 6–30% Ni, 0.6–5% Nb, 0.01–0.5% N, and 0.01–0.5% S, wherein C/N is 4–7, and the remainder comprises Fe and unavoidable impurities. The ratio A/B, of the Cr carbide formation index A to the Nb carbide formation index B, is 0.6–1.7, wherein A is represented by formula (1): A=8.5C-Nb+0.05Cr+0.65Ni-5, and B is represented by formula (2): B=7.8Nb.

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Inventors:

KIMURA HIROFUMI (JP)
NAMITO TOMONORI (JP)
KATSURAGI SUSUMU (JP)
HAYAKAWA JUNJI (JP)

Application Number:

PCT/JP2015/078228

Publication Date:

April 07, 2016

Filing Date:

October 05, 2015

Export Citation:

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Assignee:

HITACHI METALS LTD (JP)

International Classes:

C22C38/00; C22C38/60

Domestic Patent References:

WO2005103314A1

2005-11-03

Foreign References:

JP2000096192A	2000-04-04
JP2011219801A	2011-11-04
JPS5729562A	1982-02-17
JP2014210293A	2014-11-13

Other References: