Tin bronze alloy is bronze with tin as the main alloying element. The tin content is generally between 3 and 14%, and it is mainly used to make elastic components and wear-resistant parts. ROCHO provides tin bronze melting processes, andtin bronze induction melting furnace, equipment repair and parts replace, coil repair facilities, and installation services.
Melting properties of tin bronze
The most harmful impurities in tin bronze are aluminium, silicon and magnesium, when their content exceeds 0.005%, the resulting SiO2, MgO and Al2O3 oxide inclusions can contaminate the solution and reduce certain aspects of the alloy's properties. Deformed tin bronze contains no more than 8% tin and sometimes added elements such as phosphorus, lead and zinc. Phosphorus is a good deoxidiser and also improves fluidity and wear resistance. When melting tin-zinc bronze, due to the relatively low boiling point of zinc and the greater affinity for oxygen, the melt should be deoxidised before being cast into the furnace for melting, so that the zinc can supplement the deoxidation, thus helping more to avoid the risk of SnO2. As a result of the combined deoxidation of zinc and phosphorus in the melt, the 2ZnO.P2O5 produced is easier to separate from the melt, and it helps to improve the fluidity of the melt.
Melting process for tin bronze
The use of a dry charge, or even pre-heating the charge before melting, reduces or even avoids the absorption of gases by the melt. A suitable ratio of new metal to old process material also helps to stabilise the quality of the melt. The amount of old material used should not exceed 20% to 30%. Melts that are slightly contaminated by impurities can be oxidised by blowing in air or by adding an oxidising agent such as copper oxide CuO.
Old material heavily contaminated with certain impurity elements can be brought up to quality by refining with solvents or inert gases, including remelting treatments. Suitable charging and melting sequences, including melting in an industrial frequency induction furnace with strong stirring of the melt, help to reduce and avoid the occurrence of segregation.
The addition of the right amount of nickel to the melt helps to accelerate the solidification and crystallisation rate of the melt, which has a certain effect on reducing and avoiding segregation. Similar additives, such as zirconium and lithium, can also be chosen. A mixed melting method of melting copper and lead separately and then injecting the melt of lead into the copper melt at 1150 to 1180°C can be adopted without the use of solvents.
The covering agent used when melting tin bronze containing zinc should likewise include materials containing carbon such as charcoal. For continuous casting, a furnace discharge temperature of 100-150°C above the liquid phase line of the alloy is appropriate.
ROCHO INDUCTION provides medium frequency induction heating power control systems, induction melting furnaces, thermocouples, graphite crucibles etc, we designed specifically to melt tin bronze in order to hold and maintain the molten bronze at a certain temperature, uniformly circulate the metal in the furnace to produce a uniform chemical composition and temperature and provide the most accurate overall temperature control. If you have a requirement for melting metal, please contact us to get a latest quote.
