Hitachi Metals, Ltd.

Tomonori Sakuta

Kenichi Inoue

Masahide Kawabata

Kana Morishita

Susumu Katsuragi

Morishita Kana

A heat-resistant, austenitic cast steel having excellent machinability comprising by mass 0.4-0.55% of C, 1-2% of Si, 0.5-1.5% of Mn, 18-27% of Cr, 8-22% of Ni, 1.5-2.5% of Nb, 0.01-0.3% of N, 0.1-0.2% of S, and 0.02-0.15% of Al, the balance being Fe and inevitable impurities, a machinability index I represented by the following formula: I=100&#xd7;S+75&#xd7;Al+0.75&#xd7;Mn&#x2212;10&#xd7;C&#x2212;2&#xd7;Nb&#x2212;0.25&#xd7;Cr&#x2212;0.15&#xd7;Ni&#x2212;1.2&#xd7;N, wherein each element symbol represents % by mass of each element in the cast steel, meeting the condition of &#x2212;3.0&#x2266;I&#x2266;+14.0, and an exhaust member made thereof.

Heat-resistant, austenitic cast steel having excellent machinability and exhaust member made thereof

A heat-resistant, cast ferritic steel having excellent machinability comprising by mass 0.32-0.48% of C, 0.85% or less of Si, 0.1-2% of Mn, 1.5% or less of Ni, 16-23% of Cr, 3.2-5% of Nb, Nb/C being 9-11.5, 0.15% or less of N, 0.05-0.2% of S, and 0.01-0.08% of Al, the balance being Fe and inevitable impurities, and an exhaust member made thereof.

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Miyako-gun, Japan

Tomonori Sakuta