Chemical Composition
C69800 silicon brass is a high-performance copper-zinc alloy primarily composed of copper (Cu), zinc (Zn), and silicon (Si), with minor amounts of other elements to optimize performance. Its typical chemical composition is approximately 80%-83% copper, 14%-17% zinc, and 2.5%-4% silicon. Additionally, trace amounts of manganese (Mn) and iron (Fe) may be added to enhance strength and corrosion resistance. The addition of silicon significantly improves the alloy's casting and mechanical properties, enabling it to excel in complex working conditions.
Physical and Mechanical Properties
C69800 silicon brass combines high strength with excellent processability. Its tensile strength reaches 500-600 MPa, its elongation is approximately 10%-20%, and its hardness ranges from HB 150-180. The strengthening effect of silicon gives the alloy superior wear resistance and fatigue resistance compared to ordinary brass. While its thermal and electrical conductivity are slightly lower than pure copper, it still meets most industrial needs. Furthermore, silicon brass offers excellent corrosion resistance, particularly in seawater, weakly acidic, and alkaline environments, and is not susceptible to stress corrosion cracking.
Typical Applications
1. Shipbuilding and Offshore Engineering: Commonly used in the manufacture of seawater pumps, valves, propeller bushings, and other components, it offers outstanding resistance to seawater corrosion.
2. Machinery Manufacturing: Suitable for wear-resistant parts such as high-load gears and bearing bushings, balancing strength and friction reduction.
3. Chemical Equipment: This material is preferred for pipe fittings and valves operating in corrosive media.
4. Electrical and Electronics: Silicon brass is an ideal choice for conductive components or grounding devices requiring both electrical conductivity and corrosion resistance.
Processing and Process Characteristics
C69800 silicon brass can be processed by various methods, including casting, forging, and cutting. The fluidity of silicon makes it particularly suitable for precision casting. During welding, care must be taken to control heat input to avoid intergranular corrosion. Inert gas shielded welding is recommended.
C69800 silicon brass, with its excellent comprehensive properties, has become a reliable material choice for demanding environments. Its balanced mechanical properties, corrosion resistance, and processability make it a key component in multiple industrial sectors, particularly suitable for applications requiring both strength and durability.
The company has a cluster of leading copper processing production lines in China, including:
German imported precision copper tube production line (annual output of 30,000 tons)
Japanese technology copper foil rolling line (thinnest up to 6μm)
Fully automatic copper bar continuous extrusion line
Intelligent copper sheet and strip finishing mill unit
Digitalized control and management of the whole production process is realized through MES system, and the dimensional accuracy of the products can reach ±0.01mm.
