Performance and characteristics of aluminum bronze 9-4 bearings
The performance and characteristics of aluminum bronze 9-4 bearings are: high mechanical properties, good wear resistance in the atmosphere, fresh water and sea water, good casting performance, high air tightness, good wear resistance, not easy to braze, and good casting performance.
Main applications: important castings that require high strength and good corrosion resistance. It is one of the main materials for manufacturing ship propellers. It can also be used as wear-resistant and working parts below 400℃.
Characteristics and application scope of aluminum bronze 9-4 copper bearings: It is an iron-containing aluminum bronze with high strength and friction reduction, good corrosion resistance, good pressure processing in hot state, electric welding and gas welding, but poor brazing performance. QAl9-4 aluminum bronze can be used as a substitute for high-tin wear-resistant bronze.
Grade: QAl9-4
China ISC: T61720
Corresponding standard: GB /T 5231-2012 Processing copper and copper alloy grades and chemical composition
Classification: Copper and copper alloy
Performance: High strength, corrosion resistance, weldability
Label: Aluminum bronze
Features: Iron-containing aluminum bronze. It has high strength and friction reduction, and good corrosion resistance. It has good pressure processing properties under hot conditions, and can be spot welded and gas welded, but the brazing properties are not good. It can be used as a substitute for high-tin wear-resistant bronze.
Application: High-strength corrosion-resistant parts, pipe fittings working in steam media, and parts on seagoing vessels.
Scope:
①This standard specifies the grades and chemical compositions of processed copper and copper alloys
②This standard applies to copper and copper alloy processed products produced by pressure processing and the ingots and billets used therein
Composition%:
Tin Sn: 0.1
Zinc Zn: 1.0
Lead Pb: 0.01
Phosphorus P: 0.01
Aluminum Al: 8.0～10.0
Iron Fe: 2.0～4.0
Manganese Mn: 0.5
Silicon Si: 0.1.
Impurities: 1.7
Nickel Ni: 0.5
Copper Cu: Remainder
Physical properties:
Density g/cm³: 7.5
Upper critical point (liquid phase point) °C: 1041.4
Linear expansion coefficient 10^-6°K^-1/20~100°C: 16.2
Thermal conductivity W/(m.K)20°C: 58.62
Resistivity 10^-6Ω.m20°C: 0.123
Conductivity %IACS: 6.58. The unit is 10^6m/(Ω·m2)
Approximate standards:
China GB: QAl9-4; China ISC: T61720
Japan: JIS: C6191; C61900
US ASTM: 87Cu-9Al-2Fe; US UNS: C61900
International Organization for Standardization ISO: CuAl9Fe4; Digital grade: C61900
Russian GOST: БрАЖ9-4
Australian AS: 619B; C61900
