Abstract The method of producing a nodular cast iron casting comprising the melting of a cast iron bath of low sulphur content and near eutectic composition with a chill value of no more than eight thirty-seconds inch as measured by a standard wedge test. The bath is preconditioned by adding a rare earth and an alkaline earth containing alloy in an amount sufficient to increase the chill value from 50 to 150 percent and then pouring the bath into a mold having at least one reservoir and a dam skimmer gate with the reservoir containing from one-fourth to 1 1/4 percent by weight of a magnesium alloy. The last mentioned alloy is sufficient in amount to retain at least 0.01 percent magnesium in the metal from the bath which passes through the alloy so as to produce a casting containing nodular graphite.
Inventors
👤 W Moore
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-05 17:00
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
64 words
The method of claim 1, wherein said cast iron bath has a carbon content from 3.30 to 4.00 percent, a silicon content from 1.0 to 3.0 percent, a manganese content from 0.20 to 1.00 percent, and a phosphorous content from 0.02 to 0.10 percent, said cast iron in said bath or after said pre-conditioning step having a sulphur content from 0.005 to 0.06 percent.
Claim 2
Dependent Claim
21 words
The method of claim 2, wherein said rare earth comprises cerium or neodymium and said alkaline earth comprises calcium or barium.
Claim 3
Dependent Claim
17 words
The method of claim 3, wherein said cerium is cerium fluoride and said calcium is calcium silicide.
Claim 4
Dependent Claim
17 words
The method of claim 3, wherein said magnesium alloy is magnesium silicon alloy or magnesium nickel alloy.
Claim 5
Dependent Claim
33 words
The method of claim 4, wherein the volume of said alloy in said reservoir will occupy no less than 25 percent and no more than 50 perceNt of the volume of said reservoir.