What Is CuSn8PbP
CuSn8PbP, material number CW460K, is a copper-tin-lead-phosphorus alloy, commonly called leaded phosphor bronze, covered by EN 12449 for seamless round tubes for general purposes. The combination of tin, lead, and phosphorus gives the alloy high strength, good spring properties, and excellent bearing performance.
Chemical Composition
The composition limits are tin 7.5 to 9 percent, phosphorus 0.2 to 0.4 percent, lead 0.1 to 0.5 percent, iron maximum 0.1 percent, nickel maximum 0.3 percent, zinc maximum 0.3 percent, and other elements total maximum 0.2 percent, with copper as remainder. Density is 8.8 g per cubic centimeter.
Mechanical Properties
In the R460 condition the tensile strength is 460 MPa with 0.2 percent proof strength of 280 MPa and elongation of 30 percent. In the R550 condition the tensile strength is 550 MPa with proof strength of 480 MPa and elongation of 12 percent. In the R620 condition the tensile strength is 620 MPa with proof strength of 540 MPa and elongation of 5 percent. Vickers hardness ranges from 130 to 165 HV in H130, 165 to 195 HV in H165, and 180 HV in H180.
Key Properties
The alloy provides high strength and hardness with good fatigue resistance, excellent wear resistance, and good corrosion resistance in atmospheric and marine environments. The lead addition improves machinability and antifriction behavior.
Applications
CuSn8PbP seamless tubes are used for bearings and bushings, wear rings, pump components, precision instruments, springs, and corrosion-resistant hardware requiring strength and wear resistance.
Frequently Asked Questions
Q: What is the tin content of CW460K?
A: 7.5 to 9 percent.
Q: What standard covers this grade?
A: EN 12449 for seamless round tubes.
Q: What conditions are available?
A: R460, R550, and R620 with H130, H165, and H180 hardness.
Q: What is the density?
A: 8.8 g per cubic centimeter.
Q: What applications use CuSn8PbP tube?
A: Bearings, bushings, wear rings, and instrument parts.
Q: Why is phosphorus added?
A: It strengthens the alloy and improves spring properties.
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