SEFREFINER is normally sold in capsules of 25 & 50 grams. It is a whitish Powder packed in Aluminum Sheet.
200 grams of SEFREFINER is recommended per metric ton of melted brass to be inoculated. This equates to one 50 gram capsule for each 250 kilograms of melted brass.
Best casting results will occur with clean yellow brass ingot. Otherwise the basic Scrap Brass must be free of inclusions which are identified by a visual check of the polished surface. Good grain refinement usually occurs when the copper content is between 56 and 62 percent.
Optimal grain refinement usually occurs when the copper content is 59.5 percent the aluminum content is 0.6 percent.
SEFREFINER has been used to lower the casting temperatures and increase the castability and fluidity.
METHOD OF USE
As a safety precaution, care should be taken to preheat the SEFREFINER capsules on the furnace rim, shelf, etc. so they are free of any moisture.
Any adjustments to the Aluminum or Zinc content of the melt should be made prior to adding SEFREFINER. The surface of the melt should be reasonably free of slag.
SEFREFINER should be added to the melt by immersing the capsules about 50 cm-75cm (approx 25 inches or 2 feet) below the liquid metal surface using a bell shaped plunger.
Depending on the alloy composition, the use of SEFREFINER can result in the following casting benefits:
. Improved fluidity of the metal to be cast.
. Lower casting temperatures are possible depending on the size of the part to be cast and the type of mold to be used.
. Cracking tendencies of the parts to be cast are greatly reduced and most often, cracks are eliminated.
. The occurrence of Sinks/Misruns/Cold Shuts are greatly reduced.
. Lead is more uniformly distributed in the fine grain structure of alloy.
Using SEFREFINER can result in the following savings:
. Cost of purchasing fine grained ingot gets reduced.
. Casting scrap is reduced.
. Finishing and rework costs are reduced.
. Energy is saved resulting from lower casting temperatures.