Bronze

Bronze Bars produced in continuous casting.

The Bronze bars are produced in horizontal continuous casting. This process consists in making the liquid bronze come out by gravity through a cooling shell placed horizontally, on the bottom of the melting furnace. This production method guarantees absolute absence of defects inside the bar. The bronze in bars can be produced in continuous casting even with hollow section (tubes) thanks to the low melting temperature of this metal.

Centrifugal Bronze: the bronze bushings of medium and large sizes are normally produced by centrifugal casting. This process consists in pouring the liquid bronze in shells which rotate at a controlled speed and which determine the outside diameter of the bronze bushings, while the inside diameter (thickness of the bronze bushings) is determined by the quantity of bronze poured into the shell. The centrifugal bronze, thanks to the compression effect due to the centrifugation, is extremely compact and free from any kind of impurity.

Bronzo alloys and features:
The most commonly used Bronze is an alloy of Copper (Cu) and Tin (Sn) which, added in varying percentages up to 12%, increases the mechanical strength and the resistance to corrosion of this alloy in a proportional way. The bronze is plastically workable, therefore it can be extruded, rolled, forged, pressed and drawn. Obviously in alloys with higher percentages of tin, by increasing the hardness and the mechanical strength, the malleability decreases.

Another important type of bronze is the one obtained from the alloy Copper (Cu) – Aluminium (Al), also called Aluminium Bronze. The percentage of aluminium normally ranges from 5% to 12% also with the addition of Iron (Fe), Nickel (Ni) and Manganese (Mn). The main characteristic of this bronze alloy is the remarkable mechanical strength and the excellent resistance to corrosion. As for the tin bronzes, the percentage of aluminium is directly proportional to the mechanical strength and inversely proportional to the ductility, therefore, up to 8% of aluminium, this bronze is still cold deformable to obtain tubes, sheets and wires.
Up to 10% it is hot deformable and over 10% it is possible to obtain alloys with high wear resistance and very low ductility. As for these alloys, it is also important to remember the characteristics of the other elements, that are Iron (Fe), which increases the ultimate tensile strength refining the crystal grain, Nickel (Ni), which improves the resistance to corrosion.

We have a well-stocked warehouse of bronze bars in round, rectangular and square sections in the different below listed standards alloys:

Bronze G Cu Sn12 UNI 7013/2 (referenced from the old Standard as B.14) available in:

• Continuous casting round bars from Ø15mm. to Ø300mm. in standard length of 3.000 mm.
• Continuous casting round tubes from out.Ø30/ins.Ø15mm. to out.Ø250/ins.Ø190 mm. in standard length of 3.000 mm.
• Centrifugal castings with sizes up to out.Ø2.000mm. and length on request. The centrifugal bronze bushings are always rough-turned both on the outside and inside diameter and the length is cut to the required size.
• Rectangular bars with sizes from ≠30 x 15mm. to ≠300 x 100mm. in standard length of 3.000 mm.
• Square bars with sizes from ≠20 x 20mm. to ≠ 100 x 100mm. in standard length of 3.000mm.

Bronze G Cu Sn5 Zn5 Pb5 UNI 7013/8 and Bronze G Cu Sn7 Zn4 Pb6 UNI 7013/7 ( also called Bronze 85.5.5.5. and Bronze Sn7 )
This quality of bronze is also available in:

• Continuous casting round bars from Ø15mm. to Ø300mm. in standard length of 3.000 mm.
• Continuous casting round tubes from out.Ø30/ins.Ø15mm. to out.Ø250/ins.Ø190mm. in standard length of 3.000mm.
• Centrifugal bushings with sizes up to out.Ø2000mm. and length on request. The centrifugal bronze bushings are always rough-turned both on the outside and inside diameter and the length is cut to the required size.
• Rectangular bars with sizes from ≠25 x 15mm. to ≠300 x 100mm. in standard length of 3.000mm.
• Square bars with sizes from ≠20 x 20mm. to ≠100 x 100mm. in standard length of 3’000mm.

Aluminium Bronze Cu Al11 Fe4 Ni4 UNI 5275 (also called Aluminium Bronze BRAL or XANTAL) available in:

• Continuous casting round bars from Ø15mm. to Ø300mm. in standard length of 3.000 mm.
• Continuous casting round tubes from out.Ø30/ins.Ø15mm. to out.Ø250/ins.Ø190mm. in standard length of 3.000mm.
• Continuous casting round tubes from out.Ø30/ins.Ø15mm. to out.Ø250/ins.Ø190mm. in standard length of 3.000mm.
• Centrifugal bushings with sizes up to out.Ø2.000mm. and length on request. The centrifugal bronze bushings are always rough-turned both on the outside and inside diameter and the length is cut to the required size.
• Rectangular bars with sizes from ≠20 x 10mm. to ≠300 x 100mm. in standard length of 3.000 mm.
• Square bars with sizes from ≠20 x 20mm. to ≠100 x 100mm. in standard length of 3’000mm.

On request there are also other types of bronze, such as:
Lead Bronze, Nickel Bronze 25%, Phosphor Bronze, etc …

We can develop customized profiles, of any size and shape.
All bars in Bronze can be supplied cut to size (see “Services” in the technical catalogue)

All bronze commercialized by Commerciale Fond is produced by foundries with “Quality System” certified in accordance with the Standard UNI EN ISO 9001-2008.