HEAT-RESISTANT STEEL FOR ENGINE VALVE HAVING EXCELLENT HIGH-TEMPERATURE STRENGTH

Title:

HEAT-RESISTANT STEEL FOR ENGINE VALVE HAVING EXCELLENT HIGH-TEMPERATURE STRENGTH

Document Type and Number:

WIPO Patent Application WO/2010/150795

Kind Code:

A1

Abstract:

An Fe-based heat-resistant steel that has achieved a high-temperature strength as high as that of an Ni-based heat-resistant alloy makes it possible to provide a low-cost heat-resistant steel for an engine valve. Disclosed is a heat-resistant steel for an engine valve having excellent high-temperature strength, which contains, in mass%, 0.20-0.50% of C, 1.0% or less of Si, 5.0% or less of Mn, 0.1-0.5% of P, 8.0-15.0% of Ni, 16.0-25.0% of Cr, 2.0% or less (including 0%) of Mo, 0.5% or less of Cu, 1.0% or less (including 0%) of Nb, 2.0% or less (including 0%) of W, 0.02-0.30% of N, 0.01% or less of B, with the balance made up of Fe and unavoidable impurities. The heat-resistant steel for an engine valve is characterized by satisfying the following relations. 156.42P (%) + 0.91Mo (%) + 0.73W (%) - 12.27Nb (%) + 220.96N (%) + 120.59 ≥ 170 (1) 13.70P (%) - 6.97Mo (%) - 4.32W (%) - 3.29Nb (%) + 119.10N (%) + 27.75 ≥ 25 (2)

Inventors:

OHISHI KATSUHIKO (JP)
TOJI AKIHIRO (JP)

Application Number:

PCT/JP2010/060602

Publication Date:

December 29, 2010

Filing Date:

June 23, 2010

Export Citation:

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Assignee:

HITACHI METALS LTD (JP)
HONDA MORTOR CO LTD (JP)
OHISHI KATSUHIKO (JP)
TOJI AKIHIRO (JP)

International Classes:

C22C38/00; C22C38/58; F01L3/02

Foreign References:

JPS418043B1
JPS3714609B1
JPS5144505A	1976-04-16
JPS5271325A	1977-06-14
JP2001323323A	2001-11-22
JP2002294411A	2002-10-09
JPH03177543A	1991-08-01

Other References: