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Shandong Zhengxiang Industrial and Mining Equipment Co., Ltd.

Effect of Alloying Elements and Impurities on Tin Bronze

(Summary description)Shandong Zhengxiang Industrial and Mining Equipment Co., LTD casting and production of various specifications of tin bronze parts, the same casting production of aluminum bronze, brass, high force brass, lead bronze and other copper base alloy, welcome to figure customized production.

Effect of Alloying Elements and Impurities on Tin Bronze

(Summary description)Shandong Zhengxiang Industrial and Mining Equipment Co., LTD casting and production of various specifications of tin bronze parts, the same casting production of aluminum bronze, brass, high force brass, lead bronze and other copper base alloy, welcome to figure customized production.

Information

Shandong Zhengxiang Industrial and Mining Equipment Co., Ltd. is a technical comprehensive enterprise integrating research, design, production, sales and after-sales of non-ferrous metal accessories. The company has advanced manufacturing, processing equipment and complete sets of special testing equipment. And can according to customer needs, various forms and standards of customized production, built a complete and scientific quality management system; There are perfect component testing, mechanical performance testing and other quality control systems, to provide you with high quality products.

. Phosphorus

It can improve the technological and mechanical properties of bronze. Tin-phosphor bronze is widely used as an elastic material.

The solubility of phosphorus in α solid solution of tin bronze is not large and decreases with increasing tin content and decreasing temperature. When tin content is greater than 0.5%, peritectic reaction occurs at 637℃, so the thermal working temperature of this bronze should not exceed 637℃, otherwise it will produce thermal embrittlement. Therefore, the phosphorus content in the processing of tin-phosphor bronze should not be greater than 0.5%.

When P content exceeds 0.3%, eutectic crystal of copper and copper phosphide will appear in the alloy structure. Phosphates have high hardness, wear resistance and good abrasivity. Together with the δ phase, they create the conditions necessary for bearing alloys, so the phosphorus content can be as high as 1.2% when casting wear-resistant tin bronze.

Phosphorus is a good deoxidizer for copper alloys, which can increase the fluidity of tin bronze, but increase the degree of anti-segregation. Phosphorus increases the strength, hardness, elastic limit, elastic modulus and fatigue strength of tin bronze. Fine-grained tin-phosphor bronze processed materials have higher strength, elastic modulus and fatigue strength than coarse-grained processed materials, but slightly lower plasticity. Annealing at 200℃ ~ 260℃ for 1 ~ 2 hours can further improve the strength, plasticity, elastic limit and elastic modulus of the processed products, and increase the elastic stability of the tin-phosphor bronze.

. Zinc

Zinc is a common addition to tin bronze. Zinc can be substantially dissolved in alpha solid solutions of copper-tin alloys. The processed tin bronzes containing zinc all have single-phase α solid solution structure.

Zinc has no obvious effect on the microstructure and mechanical properties of tin bronze, but can improve the fluidity of the alloy, reduce the crystallization temperature range and reduce the reverse segregation of tin bronze. In the processing of tin-phosphor bronze, the zinc content is less than 2%, which will not have harmful effects.

. Lead

Lead is actually not soluble in tin bronze, it has a separate phase exists, black inclusions distributed between dendrites, its distribution is not uniform, nickel can improve the distribution of lead, and can refine the organization.

Lead reduces the friction coefficient of tin bronze, significantly improves the wear resistance and machinability of the alloy, but reduces the mechanical properties. The mechanical properties can be further improved by adding 3% ~ 5% zinc to the copper-tin-lead alloy.

.Nickel

In the tin content is less than 8% of the alloy solid solution, can dissolve a certain amount of nickel, if the increase of nickel content, will make the new brittle phase in the alloy, reduce the plasticity, the plastic processing performance is bad. Some nickel-containing tin bronzes can be used for solution treatment and subsequent aging to improve the strength and hardness of the alloy.

The addition of nickel to tin bronze can reduce the crystallization temperature interval, improve the density of the casting, reduce segregation, improve the workability, mechanical properties and corrosion resistance. Adding less than 0.25% nickel to tin phosphor bronze can refine the grain and slightly improve the mechanical properties.

.Manganese

Manganese reduces the solubility of tin in α phase solid solution. Tin bronze containing appropriate amount of manganese can be improved by solution treatment and aging to improve strength and hardness. In melting, manganese is easy to form oxides, reduce the fluidity of the alloy, is the casting performance deteriorates.

. Iron

A small amount of iron can refine the grain of tin bronze, significantly delaying recrystallization and increasing strength and hardness. However, when the iron content exceeds 0.05%, there will be too much iron phase, which significantly reduces the corrosion resistance and deteriorates the process performance, so the allowable iron content for processing tin bronze is 0.02% ~ 0.05%.

. Titanium

Titanium forms TiSn compound solidly soluble in copper with tin, the amount of which increases with the increase of titanium content. Titanium increases the hardness and softening temperature of the annealed tin bronze materials, and also causes the alloy to harden obviously.

. Beryllium

Beryllium forms an intermetallic compound with tin, and gives the copper-tin-beryllium alloy a marked precipitation hardening.

 Longmen: zirconium, niobium, nickel

Trace zirconium, niobium, nickel can improve the mechanical properties of tin bronze and cold, hot titanium plastic processing properties.

. Tub: Aluminum, magnesium, and silicon

Small amounts of aluminum, magnesium, and silicon can be incorporated into the alpha solid solution of copper-tin alloys, improving the alloy's mechanical properties. However, they are easy to oxidize to form refractory oxides during casting, and reduce the fluidity and strength of tin bronze.

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