A low-thermal expansion cast steel having an average linear thermal expansion coefficient of less than 4.0.times.10.sup.-6 /.degree. C. in a range of room temperature to 100.degree. C. and excellent machinability has a chemical composition (by mass) comprising 0.4-0.8% of C, 0.5% or less of Si, 1.0% or less of Mn, 0.01-0.3% of S, 30-40% of Ni, and 0.005-0.1% of Mg, the balance being substantially Fe and inevitable impurities, the contents of S and Mn satisfying S.ltoreq.(1/4) Mn or (1/4) Mn Una extensión bajo-termal echó el acero que tenía un coeficiente linear medio de la extensión termal de menos que 4.0.times.10.sup.-6 /.degree. C. en una gama de la temperatura ambiente a 100.degree. La C. y la manufacturabilidad excelente tiene una composición química (por la masa) el abarcar de 0.4-0.8% de C, de 0.5% o de menos del silicio, de 1.0% o de menos del manganeso, de 0.01-0.3% de S, de 30-40% del Ni, y de 0.005-0.1% del magnesio, el equilibrio que es substancialmente FE e impurezas inevitables, el contenido de S y manganeso que satisface S.ltoreq.(1/4) el manganeso o (1/4) manganeso

 
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~ 00026