Spheroidal graphite cast iron member having improved mechanical

Details Spheroidal graphite cast iron member having improved mechanical Spheroidal graphite cast iron member having improved mechanical

1993-02-25

1994-09-13

Yee, Deborah

Metal treatment

Stock

Ferrous

148902, 148543, C21D 500, C22C 3704

Patent

active

053465610

ABSTRACT:
The spheroidal graphite cast iron member having a surface layer portion mostly composed of a ferrite phase and having a thickness of at least 1 mm, and an inner portion composed of a pearlite phase and a ferrite phase, the surface layer portion having a ferritization ratio of 70% or more which is larger than that of the inner portion by at least about 15% is produced by (a) pouring a spheroidal graphite cast melt into a casting mold; (b) removing the casting mold by shake-out after the completion of solidification of the melt, while substantially the entire portion of the resulting cast iron product is still at a temperature of its A.sub.1 transformation point or higher; (c) when the temperature difference between the surface layer portion and the inner portion has become 40.degree.-60.degree. C., introducing the cast iron product into a uniform-temperature furnace kept at 750.degree.-900.degree. C., where the cast iron product is held for such a time period as to produce the surface layer portion having a ferritization ratio of 70% or more which is larger than that of the inner portion by at least about 15%; and (d) transferring the cast iron product into a cooling furnace to cool the cast iron product at a cooling speed of 15.degree.-100.degree. C./min.

REFERENCES:
patent: 3860459 (1975-01-01), Thomas et al.
patent: 4990194 (1991-02-01), Obata et al.

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