Dura-Bar 4512 HRDS is a high silicon ductile iron intended for use at elevated temperatures or when a part is subjected to thermal cycling, such as permanent mold applications. The ferritic structure remains stable so that no significant transformation takes place minimizing stresses that lead to cracks and distortion of the finished part.
The microstructure consists of Type I & Type II nodular graphite as specified in ASTM A247. The matrix will be predominantly ferrite. Chill carbides are less than 5% in any field at 100x and are well dispersed.
Heat Treat Response
Dura-Bar 4512 HDRS is not intended for hardening. The matrix structure may be softened slightly by heating to 1400° F and furnace cooling to 400° F.