What Are The Equivalent Grades of C93200 in Different Countries?
Publish Time: 2025-07-23 Origin: Site
C93200 is a tin bronze material, equivalent to British standard SAE660, German standard RG7, and similar to Chinese national standard 10-1 tin bronze. The other details are as follows:
1. Chemical composition (wt%)
Element | Content Range | Core Function |
Cu | 78.0 - 82.0% Matrix | Provide electrical conductivity / thermal conductivity |
Sn | 6.0 - 8.0% Reinforced Matrix | Enhance hardness and wear resistance |
Pb | 6.0 - 8.0% - Improves machinability | Provide self-lubrication capability |
Zn | 2.0 - 4.0% Deoxygenation | Reduce pore defects |
Fe、Ni | Impurities ≤ 1.0% | Control the impurity content to ensure performance |
Note: The high lead content makes it unsuitable for high-temperature (>150°C) or high shear stress scenarios.
C93200
Nut
Lead screw
Lead screw nut
2. Physical and Mechanical Properties
(1) Basic physical properties
Parameters | Value range |
Density | 8.8–9.1 g/cm³ |
Thermal conductivity (at 20°C) | 45–50 W/(m·K) |
Coefficient of linear expansion (20 - 200 °C) | 18.5 ×10⁻⁶/°C |
Electrical conductivity (IACS) | 15–18% |
(2) Mechanical properties (in the as-cast state)
Parameters | Typical value |
Tensile strength (σ_b) | 220–275 MPa |
Yield strength (σ_0.2) | 120–150 MPa |
Strain (δ) | 10–20% |
Hardness (HB) | 65–85 |
Impact toughness (KU₂) | 25–40 J |
(1) Self-lubrication
The lead phase is distributed as isolated particles in the matrix. During friction, a lubricating film is formed, resulting in a friction coefficient as low as 0.08 - 0.12 (in dry friction conditions).
Under conditions without lubricating oil, the lifespan is extended by 50% compared to babbitt alloy.
(2) Wear resistance and shock absorption
Wear resistance: When the PV value (pressure × speed) is ≤ 1.4 MPa·m/s, the wear rate is < 0.05 mm³/N·m.
Shock absorption: The damping coefficient is 5 times that of steel, effectively reducing mechanical vibration noise.
(3) Machinability
Cutting property: The soft phase of lead reduces the cutting force by 30%, and the surface roughness Ra can reach 1.6 μm.
4. Summary
SAE 660 is a cost-effective, self-lubricating, and easy-to-machine classic bronze. It is suitable for the production of lead screws because SAE 660 bronze is a standard copper nut material with excellent mechanical properties and wear resistance, making it suitable for applications in lead screws. The use of this material can enhance the load capacity of ball screws and optimize their PV performance.
Welcome to contact us for more information.