Bronze bars
Bronze is a hard material with better anti-corrosive properties.
Alloys offered:
- CuSn7Zn4Pb7: semi-hard bronze, resistant to corrosion in seawater, has good sliding properties and good wear resistance, under working conditions not exceeding 200°C, it is the most widely used bronze on the market
- CuSn12): hard bronze, with high resistance to corrosion, impact and cavitations, has excellent performance under heavy loads and high pressures (up to 80 MPa)
- CuSn10Pb10: the bronze that best combines machining and sliding properties.
COMMON AREAS OF USE FOR BRONZE BARS
CuSn7Zn4Pb7:
Cusn7Zn4Pb7 automotive fittings, washers, bearings, crane bearings, bushings, diesel engine screw bushings, couplings, press lever bearings, fuel pump bushings, general purpose bushings, hydraulic press main liner, press bushings, hydraulic press filler box, machine tool bushings and bearings, main spindle bearings, pump rotors, water pump bushings
CuSn12:
bearings, bushings in heavy-duty machines with low rotational speed, gear wheels, gearboxes, valve bodies, speed reducers, bevel gears
Cusn10Pb10:
nuts, motor washers, brackets, applications requiring resistance to acidic sulphite fluids, bearing plates, bearings, high speed and high pressure bushings, corrosion resistant castings, crankshafts, high load and high speed bearings, rotors, machine parts, pressure resistant sealed castings, pumps, sliding guides for steel mills, large bearings for ships
ALLOYS COMMONLY USED IN BRONZE BARS
- EXECUTION STANDARD:
STANDARD NAME DESCRIPTION EN 1982 Copper and copper alloys, ingots and cast products
- Chemical composition:
CuSn7Zn4Pb7 Cu Ni P Pb Sn Zn Al Fe S Sb Si Min 81,0 - - 5,0 6,0 2,0 - - - - - Max 85,0 2,0 0,10 8,0 8,0 5,0 0,01 0,2 0,01 0,3 0,01 CuSn12 Cu Ni P Pb Sn Zn Al Fe S Sb Si Min 85,0 - - - 11,0 - - - - - - Max 88,5 2,0 0,6 0,7 13,0 5,0 0,01 0,2 0,005 0,15 0,01 CuSn10Pb10 Cu Ni P Pb Sn Zn Al Fe S Sb Si Min 78,0 - - 8,0 9,0 - - - - - - Max 82,0 2,0 0,10 11,0 11,0 2,0 0,01 0,25 0,10 0,5 0,01
- Physical properties:
ALLOY DENSITY SPECIFIC HEAT COEFFICIENT OF THERMAL EXPANSION THERMAL CONDUCTIVITY ELECTRICAL CONDUCTIVITY MODULUS OF ELASTICITY Cusn7Zn4Pb7 kg/dm3 J/(g*K) 10-&sup6; K W/(m*K) MS/m (20ᵒC) 8,8 0,356 18,5 64 7,5 - Cusn12 8,6 0,376 18,5 54 6,2 95 Cusn10Pb10 9,0 0,376 18,7 54 6,0 -
- Mechanical properties:
ALLOY CASTING PROCESS MECHANICAL RESISTENCE
RM (MPA)YIELD STRENGTH 0,2%, RPO,2 (MPA) ELONGATION (%) HARDNESS HB Cusn7Zn4Pb7 Continuous casting (GC) 260 120 12 70 Centrifugal casting (GZ) 260 120 12 70 Cusn12 Continuous casting (GC) 300 150 6 90 Centrifugal casting (GZ) 280 150 5 90 Cusn10Pb10 Continuous casting (GC) 220 110 8 70 Centrifugal casting (GZ) 220 110 6 70
