English Aurubis Stolberg Advanced Phosphor Bronze Alloys Advanced Phosphor Bronze opens up new possibilities for applications Phosphor Bronze alloys are regarded as very important copper materials due to their excellent properties, such as the combination of high strength with sufficient electrical conductivity and high resistance to wear and corrosion. They are the preferred material for the production of electrical contact parts thanks, in particular, to their unusual springiness and outstanding fatigue strength. Aurubis Stolberg is now offering advanced phosphor bronze alloys to meet the constantly increasing demands on modern contact materials. Composition and metallurgy Advanced phosphor bronze alloys are bronze materials with a tin content of between 3.5 and 9 % and CuSnZn9, which also contain small amounts of nickel and iron. The strength of conventional bronze materials stems from the impact of solid solution hardening that is achieved by the alloy’s tin content. In addition to this solid solution strengthening, the processing of advanced phosphor bronze alloys into semi-finished products results in precipitation hardening due to the formation of nickel and iron phosphides during a special annealing process. The chemical composition and physical properties of advanced phosphor bronze with 4 and 8 % tin are shown in the following table. * Unified numbering system Copper Tin Iron Nickel Phosphorus Zinc Density Electr. conductivity Thermal conductivity Therm. Expan sion coeff. E-module AURUBIS STOLBERG PNA 284 CuSn4 UNS* S51100 PNA 294 CuSn4 Adv. UNS* C51180 PNA 283 CuSn8 UNS* C52100 PNA 293 CuSn8 Adv. UNS* C52180 PNA 299 CuSn3Zn9 Adv. UNS* C42520 Residue 3.5 – 4.9 < 0,10 – 0.03 – 0.35 – 8.85 g/cm3 12.0 MS/m Residue 3.50 – 4.90 0.05 – 0.20 0.05 – 0.20 0.01 – 0.35 – 8.85 g/cm3 11.6 MS/m Residue 7.0 – 9.0 < 0.10 – 0.03 – 0.35 – 8.80 g/cm3 7.5 MS/m Residue 7.00 – 9.00 0.05 – 0.20 0.05 – 0.20 0.01 – 0.35 – 8.80 g/cm3 7.4 MS/m 88.0 – 91.0 1.50 – 3.00 0.05 – 0.20 0.05 – 0.20 0.01 – 0.20 Residue 8.80 g/cm3 17 MS/m 100 W/mK 90.6 W/mK 62.4 W/mK 67 W/mK 130 W/mK 18.0 10-6K-1 17.8 10-6K-1 18.2 10-6K-1 18.5 10-6K-1 18.4 10-6K-1 120 GPa 110 GPa 110 GPa 115 GPa 110 GPa Strength and electrical conductivity The strength compared with conventional bronze can be increased on account of the additional strengthening caused by the aforementioned nickel and iron precipitation. Since the additionally discharged iron and nickel are precipitated in the form of the aforementioned phosphide, the electrical and thermal conductivity does not appreciably decline compared with iron-free and nickel-free bronze with the same tin content. New areas of application are the result of the increased strength of these advanced phosphor bronze alloys. With still good workability, a modified CuSn8 bronze can achieve tensile strength of more than 900 N/mm², which today is normally confined to CuBe alloys. The advanced CuSn8 bronze thus presents both an economically and ecologically interesting alternative to CuBe materials. With modified CuSn4 (CuSn4 Adv.), it is for instance possible in this way to achieve the strength of conventional CuSn6 while maintaining the conductivity of conventional CuSn4. The alloy CuSn3Zn9Adv. offers the strength and processing properties of conventional CuSn4 but with much higher conductivities. This combination of possible spring force and conductivity enables new possibilities for the connector designer. FIG. 1: Yield strength and electrical conductivity of copper alloys AURUBIS STOLBERG Workability Also when processed into complex punching/ bending parts, these materials have a technolo gical advantage in the form of a favourable stress condition, lower particle size and thus improved flexibility. Additionally, advanced phosphor bronze alloys have excellent properties for punching and electroplating. They can also be very well soft and hard soldered and are suitable for resistance welding. Delivery programme DIMENSIONS: As for the conventional phosphor bronze alloys, Aurubis Stolberg supplies advanced phosphor bronzes in the following dimensions and coil weights • Strip thickness: 0.1 to 3.0 mm • Strip width: 10 to 600 mm • Spec. coil weight: up to 15 kg/mm SURFACE FINISH: The following surface finishes can be delivered • blank • hot-dip tinned • electroplated SHAPES: • coil (eye-to-sky or eye-to-wall) • ContiCoil • traverse wound (with or without core) APB_03/12 EN FIG. 2: Bendability of bronze alloys, here for example a 90° bend in parallel with the rolling direction Contact Aurubis Stolberg GmbH & Co KG Fon Fax Zweifaller Straße 150 D – 52224 Stolberg E-mail:[email protected] Webwww.aurubis.com/stolberg + 49 2402 1241-0 + 49 2402 1241-2927
© Copyright 2025 Paperzz