LEAD-FREE REPLACEMENT BRONZE ALLOYS
Silicon brass is a copper alloy that removes lead from the product and adds a small amount of silicon
(2%-4%) to improve the performance of the alloy during the manufacturing processes. Silicon brass
provides good manufacturing capabilities for casting, forging, and machining. This alloy is
naturally corrosion resistant and its high-temperature performance is very good.
BISMUTH TIN BRONZE
Bismuth tin bronze is a copper alloy which typically contains 1-3% bismuth, although some can contain
over 6% Bi. This bronze alloy is very corrosion-resistant, making it suitable for use in
environments such as the ocean. Bismuth tin bronzes are more malleable, thermally conductive, and
polish better than regular brasses.
HIGH TIN BRONZE
The bronze alloys which are described as tin bronzes have long been recognized for their low lead
content (less than 0.25% lead) and high strength characteristics. These alloys from C90300 through C91000 and C91300 are not materially different than those produced more than 3,500
years ago in Europe and China. These high tin bronze alloys are strong and have high wear resistance
and low friction resistance, which make them ideal for bearings, as well as in valves and fittings
where pressure tightness is necessary. In today’s world, these proven alloys are all green with
their low-lead content.
Aluminum bronze is the highest strength standard copper-based alloy. Concast produces C95400, C95500 and C95900 in standard sizes of rounds, tubes, and rectangles. Aluminum in
conjunction with iron and nickel in C95500 acts as a strengthener in these alloys. All of the
aluminum bronzes can be heat treated, further increasing tensile strengths.
C89520, or Envirobrass II, is a lead-free metal alloy created with the
concern in mind that water delivery systems should not interfere with water quality. For many years,
brass has been the choice for plumbing equipment such as meters and valves. But even high-quality
brass contains 8% lead. Envirobrass II alloys offer the foundry industry modern, environmentally
friendly alloys that are able to meet the stringent requirements of current water purity
regulations. Federal regulations limit the amount of lead permitted in public drinking water.
Envirobrass II removes the concern of lead leaching into drinking water from in-line plumbing
LEAD-FREE BEARING BRONZE
Apart from providing excellent anti-friction and anti-wear properties for bearing alloys, lead is
considered an environmentally hazardous material. Lead content in bearing bronze varies depending on
the application and, in some cases, is fairly low. However, disposal of waste material from
fabrication processes, disposal of used bearings, and contamination of lubricants can cause serious
environmental and health concerns. Regulations prohibit the use of lead in plumbing applications as
well as bearing materials.
As an answer to these concerns, another subcategory of lead-free replacement bronze alloys has been
noted in the bronze industry, titled lead-free bearing bronze. This lead-free, environmentally
friendly copper-based bearing material is designed for high speed/load applications. Bronzes in this
group of alloys, also noted above, include C89835, C90300, C95400, C95500 and C95900.
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