Desofin - Expected Results for Various Copper Alloys
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Alloy Class and General Parameters
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Yellow Brass
(Over 17% Zn. Sn less than 6%. Under 2%
total Al, Mn, Ni, Fe, Si. Pb less than 0.5%
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100 grams
per metric
ton
(5 grams
per 100 lb.)
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Grain refinement occurs when copper
content is between 57 and 63 percent.
Optimal grain refinement occurs when
copper content is 59.5 percent and
aluminum content is 0.6 percent. See
Notes 1 and 2.
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Leaded Yellow Brass
(Over 17% Zn. Sn less than 6%. Under 2%
total Al, Mn, Ni, Fe, Si. Pb more than 0.5%
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100 grams
per metric
ton
(5 grams
per 100 lb.)
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High Strength Yellow Brass (Manganese
Bronze)
(Over 17% Zn. Over 2% total Al, Mn. Sn, Ni,
Fe. Si less than 0.5%. Pb less than 0.5%.
Sn less than 6%)
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100 grams
per metric
ton
(5 grams
per 100 lb.)
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May reduce
grain if Sn + Fe is
less than 0.5%
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Red Brass
(2% to 8% Zn. Sn less than Zn. Pb under
0.5%)
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200 grams
per metric
ton
(9 grams
per 100 lb.)
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Use without AL tubes. Add to transfer
ladle along with phos copper. If high
oxygen occurs, add Mn before
adding DesofinTM .
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Aluminum Bronze
(Al 5% to 15%. Fe up to 10% - with or without
Mn or Ni. Si less than 0.5%
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200 grams
per metric
ton (9
grams per
100 lb.)
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If high oxygen occurs, add Mn before
adding DesofinTM .
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Tin Bronze
(Sn 2% to 20%. Zn less than Sn. Pb under
0.5%)
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200 grams
per metric
ton (9
grams per
100 lb.)
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Use without Al tubes. Add to transfer
ladle along with phos copper.
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Notes:
1. If Sn + Fe is greater than 0.5%, intermetallic compounds will form that will leave "comet tails" when casting is polished.
2. Miller & Engelhardt Desofin, Ltd. recommends use of "B-2" yellow brass alloy with DesofinTM for permanent molding applications. B-2 alloy composition: Cu 59.5 to
61.5%; Pb 0% to 3.0%; Al 0.5% to 0.7%, Ni 1%; Sn + Fe 0.5 % max, Mn 0.02% max, Si 0.02% max, Zn balance.
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