Hitachi Metals, Ltd.

Hino Motors, Ltd.

Seiichi Endo

Koki Otsuka

Masanori Hara

Masahide Kawabata

Tsunehiro Kawata

Susumu Katsuragi

Yoshio Igarashi

Takashi Hattori

Masahiro Miyake

Precipitation-hardened, martensitic, cast stainless steel having a composition comprising, by mass, 0.08-0.18% of C, 1.5% or less of Si, 2.0% or less of Mn, 0.005-0.4% of S, 13.5-16.5% of Cr, 3.0-5.5% of Ni, 0.5-2.8% of Cu, 1.0-2.0% of Nb, and 0.12% or less of N, the amounts of C, N and Nb meeting the condition of &#x2212;0.2&#x2266;9 (C %+0.86N %)&#x2212;Nb %&#x2266;1.0, the rest being Fe and inevitable impurities, and having a structure in which Cu precipitates having an average particle size of 0.1-0.4 &#x3bc;m are dispersed in a tempered-martensite-based matrix.

Precipitation-hardened, martensitic, cast stainless steel having excellent machinability and its production method

A graphite-containing, heat-resistant cast iron for exhaust equipment members used at temperatures exceeding 800&#xb0; C., comprising 3.5-5.6% of Si and 1.2-15% of W on a weight basis, and having intermediate layers, in which W and Si are concentrated, in the boundaries of graphite particles and a matrix. An exhaust equipment member formed by this heat-resistant cast iron has an Atransformation point is 840&#xb0; C. or higher when measured from 30&#xb0; C. at a temperature-elevating speed of 3&#xb0; C./minute, and a thermal cracking life of 780 cycles or more in a thermal fatigue test, in which heating and cooling are conducted under the conditions of an upper-limit temperature of 840&#xb0; C., a temperature amplitude of 690&#xb0; C. and a constraint ratio of 0.25.

Heat-resistant cast iron and exhaust equipment member formed thereby

An integrally cast steel piston for internal engines, the cast steel having (a) a composition comprising 0.8% or less of C, 3% or less of Si, 3% or less of Mn,0.2% or less of S, 3% or less of Ni, 6% or less of Cr, 6% or less of Cu, and 0.01-3% of Nb, the balance being substantially Fe and inevitable impurities, or (b) a composition comprising 0.1-0.8% of C, 3% or less of Si, 3% or less of Mn, 0.2% or less of S, 10% or less of Ni, 30% or less of Cr, 6 % or less of Cu, and 0.05-8% of Nb, the balance being substantially Fe and inevitable impurities, by mass.

Internal engine piston and its production method

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Tochigi-ken, Japan

Seiichi Endo