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75% FeSi-Ca+Ba
In Gray Iron:
Recent
literature has shown once again that effects obtained from the combined
addition of two alloying elements are often greater than the added effects
of the individual elements. This same type of synergistic effect has long
been recognized with regard to the role of Calcium and Barium in cast iron
inoculation. The combination of Calcium and Barium in 75% FeSi-Ca+Ba provides
a potent nucleating effect with about 40% less 75% FeSi-Ca+Ba needed to
obtain equivalent chill depths produced by the use of standard inoculating
grade ferrosilicons. At similar addition rates 75% FeSi-Ca+Ba produced
dramatically lower chill depths than standard inoculants at all Carbon
equivalent levels. 75% FeSi-Ca+Ba is particularly useful in higher strength
3.6-3.8 Carbon equivalent irons, in which inoculation would be expected
to have the greatest effect on improvement of mechanical properties. The
combination of Calcium and Barium minimizes undercooling and promotes eutectic
solidification with Type A graphite and a pearlitic matrix. The comparatively
high Silicon content of this alloy further serves to increase eutectic
cell count, ensuring optimum properties from a given iron analysis. Because
the alloy is based on 75% ferrosilicon, its reaction with liquid is exothermic,
ensuring excellent dissolution and consistency of results.
In Ductile Iron: Alloys
containing over 70% silicon have long been the favored inoculation
material for ductile iron. In special carbide prone work, many commercial
foundries have reported increased nucleation and elimination of chill
because of the more potent effect of Calcium plus Barium. During a
two day trial in a commercial foundry comparing a Calcium plus Barium
alloy, a regular Calcium bearing ferrosilicon and a high Aluminum European
inoculant, the Calcium plus Barium alloy produced nodule counts 18%
higher than either of the other two alloys. 75% FeSi-Ca+Ba can be
used in all grades of ductile iron.
Specifications
Chemical
Analysis: |
Sizing: |
3/8"x20M |
Silicon |
70.0-79.0% |
Calcium |
0.8-1.50% |
Barium |
0.8-1.50% |
Aluminum |
1.50% max |
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Effective
Date: 5/12/08 |
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Please
Note:
Product specifications are subject to change
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