Tin bronze grades and applications in common use
Tin bronze has higher mechanical properties, better corrosion resistance, antifriction and good casting properties. Small sensitivity to overheat and gas, good welding performance, non - ferromagnetism. Tin bronze is a non-ferrous metal alloy with minimum shrinkage, which is used to produce castings with complex shapes, clear Outlines and low air tightness requirements. Tin phosphorus bronze is corrosion-resistant in the atmosphere, seawater, fresh water and steam, and is widely used in steam boilers and Marine ship parts. Tin bronze is more resistant to corrosion in the atmosphere, seawater, fresh water and steam than brass. Phosphor tin bronze has good mechanical properties and can be used as wear - resistant and elastic parts of high precision working machine. Leaded tin bronze is commonly used as wear - resistant parts and sliding bearings. Zinc-tin bronze can be used as high air tightness casting.
Common tin bronze brands include QSN4-3, QSN4-4-2.5, QSN6.5-0.1, QSN6.5-0.4, etc. In industry, deformed tin bronze is mostly used as elastic element and wear - resistant and antimagnetic parts.
As a result, the tin content of industrial tin bronze is generally 3% to 14%.5% tin bronze is suitable for cold working, 5%~7% tin bronze is suitable for hot working, and more than 10%Sn bronze is suitable for casting. Due to the large crystallization interval and the slow diffusion of tin in copper, the actual as-cast structure deviates greatly from the equilibrium diagram. Intracrystalline segregation and a small amount of &delta formed in the solid state; The phase can be eliminated after a long period of uniform annealing at high temperature (650-700℃) and repeated pressure machining. At the same time, after alloying treatment, the plasticity of the alloy will also be improved obviously. In addition to Sn, tin bronze generally contains small amounts of Zn, Pb, P, Ni and other elements.
Phosphorus effectively deoxidizes, increases alloy fluidity, and improves alloy strength, hardness, elastic modulus, fatigue strength, and wear resistance. Tin phosphor bronze is one of the elastic materials widely used in industry. The phosphorus content of deformed tin bronze should not exceed 0.5%, otherwise it will affect the hot cracking during processing.
The crystallization range of tin bronze was narrowed obviously after adding zinc, because the fluidity of alloy in liquid state was improved. In addition, it can promote deoxidation and degassing during smelting, reduce the tendency of reverse segregation, improve the density of alloy, and reduce the degree of in-grain segregation. Zinc is highly soluble in tin bronze & Alpha; In the phase, the alloying strength is increased, the mechanical properties are improved and the production cost is reduced.
Lead is added to tin bronze castings to increase air tightness, such as in valve bodies or pumps. This is because lead does not dissolve in tin bronze, and the free phase is distributed among the crystal branches during solidification, so segregation of tin bronze is easy to occur, but the density of casting can be increased. In addition, lead can improve the wear reduction and cutting property of the alloy, but reduce the mechanical property of the alloy. Because lead causes hot brittleness of the material, tin - zinc - lead bronze can only deform in cold state. Such alloys are often used as corrosion-resistant, wear-resisting and easily-cut bushing, bearing bushing, etc.
Zillion Copper Technology Co., LTD specializes in the production of various copper alloy products: tin bronze, aluminum bronze, phosphor bronze, brass, etc., and at the same time, processing finished bushing, sleeve, bearing shell, sliding foot copper plate, sliding block, copper division...Welcome to inquire, 13584281751 Mr. SVEN.