A foundry performing grain refinement of yellow brass either with boron or a proprietary grain refiner should ensure that the starting ingot contains a low level of iron, preferably less than the maximum solubility for the operating temperature.
5% to avoid hard spot formation in yellow brass and EnviroBrass III alloys.
Five alloys--pure copper (C80100), aluminum-bronze (C95400), high-zinc yellow brass (C85800), silicon-brass (C87500) and silicon-bronze (C87600)--were evaluated using these two castings.
4%) in yellow brass was found to be beneficial in reducing zinc oxide deposition on the molds without compromising the casting fluidity.
Leaded yellow brass (C85800 containing 1-5% lead) is a common plumbing alloy for permanent mold casting.
Table 3 compares the properties of this new high phosphorous brass, SeBiLOY III, and yellow brass.
The foundry learned that gating for the yellow brass permanent mold castings needed to be three times the size of gating for the red brass sand castings.
The yellow brass castings have a high cosmetic appeal, so they are ground, polished, buffed; chrome-plated and buffed again to a high finish luster.
Mike Regelbrugge, director of engineering at Globe Valve, says the fine appearance of the yellow brass permanent mold castings has helped his foundry's business as the quality level expected of plumbing castings has "ratcheted up over the last 100 years to the point that faucets are viewed as bathroom jewelry.
By focusing on the plumbing component market - faucets, handles and water softener valve bodies - for its yellow brass
castings, this 200-employee foundry has learned that appearance and pleasing the customer's eye sells just as much in its market as tensile strengths and microstructures.
The corrosion behavior of silicon brasses (C87500 and C87800), high-zinc yellow brass
(C85800), low-zinc yellow brass
(C85200), leaded-tin bronze (C83450) and silicon bronzes (C87600 and C87610) in permanent mold and sand-cast conditions was studied in soft water by M.