C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/14
C22C 33/08 (2006.01) C21C 1/08 (2006.01) C21C 1/10 (2006.01)
Patent
CA 1250453
- 10 - Abstract There is disclosed a process for the production of cast iron with an intermediate structure of vermicular graphite, in which a GGG melt (for making cast iron with spherulitic graphite) is used as a starting melt, and such starting melt can be produced in a converter in an accurate and reproducible way, whereby there are constant sulphur and oxygen amounts. Proceeding from this data regarding the GGG melt, sulphur is additionally mixed with the melt and the amount added is determined in accordance with the formula: S = A . Mg - B, wherein, S = added amount of sulphur-containing material based on pure sulphur in % by weight, Mg = magnesium content of the starting melt in % by weight, A = magnesium factor: 0.9 ? A ? 1.2, B = sulphur constant: - 0.02 ? B ? + 0 05. The addition of sulphur to the starting melt is such as to increase the magnesium/sulphur ratio present in the starting melt so as to lie in the range 2:1 to 1:1, whereby the spherulitic graphite is converted into vermicular form. The accuracy and reproducibility of the proposed method is due mainly to the fact that in the first step of the process (production of the GGG starting melt), instablility factors are already eliminated by virtue of the known Georg Fischer production technique for making GGG. In addition, it is the only process known until now which is suitable for use in an automatic installation for the optional casting of GGG or GGV.
477099
Brandenberger Urs
Menk Werner
Fischer (georg) Aktiengesellschaft
Robic Robic & Associes/associates
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