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What Are The Equivalent Grades of C93200 in Different Countries?

Views: 5 Author: Site Editor 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

3. Core Performance Advantages‌

‌(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.

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What Are The Equivalent Grades of C93200 in Different Countries?

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