The difference between lead tin bronze and tin bronze

Differences between lead-tin bronze and tin bronze Phosphor bronze. Tin phosphor bronze has higher corrosion resistance, wear resistance, no sparks when punching out. It is used for bearings at medium speeds and heavy loads, and the working temperature is 250 ° C. It has self-aligning and no deflection Sensitivity, uniform bearing capacity, high bearing capacity, radial load at the same time, self-lubricating and maintenance-free. Lead in lead bronze is not actually dissolved in copper-tin alloy. It is distributed in the branches as single-phase black inclusions. Intergranular. The distribution of lead in the ingot is not easy to be uniform, usually adding a small amount of nickel can improve its distribution and refine the structure. Lead reduces the friction coefficient of tin bronze, improves wear resistance and machinability, but slightly reduces mechanical properties. In copper tin 3% to 5% zinc is often added to lead alloys to further improve the mechanical properties. Add 0.02% to 0.1% zirconium or 0.02% to 0.1% boron, especially 0.02% to 0.02% .2% rare earth elements can refine lead particles and make them evenly distributed, so as to improve the structure, casting and mechanical properties of lead-containing tin bronze. Ensure that it has strong fatigue resistance at the same time. The hard-wired electrical structure of the jack reed of tin phosphor bronze, no rivet connection or no friction contact, can ensure good contact, good elasticity, and smooth insertion. The alloy has excellent properties Machining performance and chip forming performance can quickly shorten the processing time of parts processing. Lead bronze has good lubricating performance, good shock resistance, wear resistance, corrosion resistance, easy processing and casting, and is widely used in bearings and bushings. (Bushing), pressing (packing), submerged motor parts, but the strength is not enough, please do not use it on force components such as gears, worms, etc. Among them, LBC2 and LBC3 have high strength and are suitable for medium and high speed and heavy load bearings. LBC4 is suitable for medium-speed and medium-load bearings. LBC5 contains a lot of lead, which is suitable for medium-high-speed and low-load occasions, and has the characteristics of high temperature resistance. SAE660 is suitable for medium-speed and medium-load bearings. This specification is more common in the United States and Canada. The continuous casting specifications of the above products are limited, and a special small amount can be gravity cast, but the mechanical properties and quality are still better than those of foreign continuous casting. To sum up, the introduction of lead tin bronze and tin bronze can be understood the difference.