Patent ID: 6344095
Filing Date: 2002-02-05
Classification: C22C

Abstract:
A low-thermal expansion cast steel with excellent machinability consisting essentially of 0.3-0.9% by mass of Cg 25-40% by mass of Ni, 1.0% or less by mass of Mn, 0.01-0.3% by mass of S, 1.5% or less by mass of Si and 0.005-0.1% by mass of Mg, and having an area ratio of 0.03-3% of graphite and an area 0.002-0.3% of granular MnS in an austenitic matrix structure, whereby said cast steel has an average linear thermal expansion coefficient of less than 4.0Ã—10âˆ’6/Â° C. in a range of room temperature to 100Â° C.