Bronze Alloy Typical Applications
- General purpose bushes & bearings
- Bearings for lifting tackle
- Automotive fittings
- Fuel & water pump bushings
- Valve & slide seating rings
- Hydraulics
- Fittings
- Thrust washers
Product Description
SigmaBronze 7 is a leaded continuously cast copper based alloy that is suitable for a variety of applications that are under medium loads whilst using adequate lubrication. This alloy offers good sliding and dry running properties and is not subject to dezincification and has a reasonable resistance to brine making it suitable for pump and valve components. SigmaBronze 7 can be used as an alternative to SAE660 in many applications but has the advantage of being available in metric sizes.
Corrosion resistance
Reasonable corrosion resistance
Related material specifications
• SAE660 • BS1400 LB4
Key features
• Excellent machining properties
• Used in bushes and bearings under medium loads
• Higher running speeds
• Good wear resistance
• Excellent anti-friction qualities
• A versatile bronze that can be used in many applications
Weldability
Not recommended but SigmaBronze 7 is soft-solderable and to some extent also brazable.
Machinability
Excellent machinability
Chemical Composition (weight %) | ||||||||||||
Cu | Al | Fe | Ni | P | Pb | Si | Sn | Zn | S | Sb | ||
min | 81.00 | 5.00 | 5.40 | 2.00 | ||||||||
max | 85.00 | 0.01 | 0.20 | 2.00 | 0.10 | 8.00 | 0.01 | 8.00 | 5.00 | 0.10 | 0.30 | |
Mechanical Properties (actual properties according to specification chosen) | |
Hardness Brinell | min. 70 min. 260 min. 120 min. 12 |
