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Gunmetal (Copper-Tin-Zinc cast alloys)
DIN 1705 bzw. DIN EN 1982 
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| Alloy | EN number |
Density ca. |
Composition in % of weight |
Properties and use |
| CuSn7Zn3Ni2PS-C DIN EN 1982 (EC7) |
CC471K | 8.8 | Cu 85,0 - 92,3 Sn 5,4 - 8,0 Zn 1,0 - 3,5 Ni 1,1 - 2,5 P 0,03 - 0,06 S 0,2 - 0,6 Pb < 0,09 |
The EC7 material represents an equivalent lead-free alternative to the standard alloy RG7 (CC493K). The material can thus be used for the same applications as the lead containing standard alloy. At medium hardness, it has good emergency running properties and sufficient wear resistance. Also suitable for use with unhardened shafts and light edge pressures. Easy to machine, creating short shavings, good corrosion resistance (also in sea water), soft and (conditionally) hard solderable. The main areas of application are plain bearings and bushes for general mechanical engineering. |
| Important tempers |
Tensile Strength Rm N/mm² |
Yield Stress Rp0,2 N/mm² |
Elongation A % |
Hardness HB |
|
| GC |
≥ 260 |
≥ 120 |
≥ 12 |
≥ 70 |
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| Product with information obligations to REACH-Legislation | |||||
Comparable Specifications:: CuSn7ZnPb, 2.1090, DIN 1705 (Rg7) C93200 UNS EC7 - alternative for Rg7 (CC493K) |
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| Alloy | EN number |
Density ca. |
Composition in % of weight |
Properties and use |
| CuSn5Zn5Pb5-C DIN EN 1982 (Rg5) |
CC491K | 8.7 | Cu 83,0 - 87,0 Sn 4,0 - 6,0 Zn 4,0 - 6,0 Pb 4,0 - 6,0 |
Construction material. The main areas of application are water and steam fitting housings up to 255 °C, pump housings and thin-walled, intricate castings and machined parts for mechanical and apparatus engineering and shipbuilding. Is usually replaced as a bearing material with Cu Sn7 Zn4 Pb7-C today. |
| Important tempers |
Tensile Strength Rm N/mm² |
Yield Stress Rp0,2 N/mm² |
Elongation A % |
Hardness HB |
|
| GZ GC |
≥ 250 ≥ 250 |
≥ 110 ≥ 110 |
≥ 13 ≥ 13 |
≥ 65 ≥ 65 |
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| Product with information obligations to REACH-Legislation | |||||
Comparable Specifications:: CuSn5ZnPb, 2.1096, DIN 1705 (Rg 5) C83600 UNS LG2, BS 1400 |
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| Alloy | EN number |
Density ca. |
Composition in % of weight |
Properties and use |
| CuSn7Zn4Pb7-C DIN EN 1982 (Rg7) |
CC493K | 8.8 | Cu 81,0 - 86,0 Sn 5,2 - 8,0 Zn 2,0 - 5,0 Pb 5,0 - 8,0 |
Most common, low-budget gunmetal alloy for plain bearings. Still has good dry-running properties and sufficient wear resistance at medium hardness. Also suitable when unhardened shafts and light edge pressure are used. Short-chipping material, good machinability, good corrosion resistance (even in seawater), soft solderable and to a limited extent hard solderable. The main areas of application are plain bearings and bearing bushings for general mechanical engineering.. |
| Important tempers |
Tensile Strength Rm N/mm² |
Yield Stress Rp0,2 N/mm² |
Elongation A % |
Hardness HB |
|
| GZ GC |
≥ 260 ≥ 260 |
≥ 120 ≥ 120 |
≥ 12 ≥ 12 |
≥ 70 ≥ 70 |
|
| Product with information obligations to REACH-Legislation | |||||
Comparable Specifications:: CuSn7ZnPb, 2.1090, DIN 1705 (Rg 7) C93200 UNS |
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| Alloy | |
Density ca. |
Composition in % of weight |
Properties and use |
| CuSn10Zn (Rg10) DIN 1705 No longer included in DIN EN 1982 norm. |
2.1086 | 8.7 | Cu 86,0 - 89,0 Sn 9,0 - 11,0 Zn 1,0 - 3,0 Pb ≤ 1,5 |
This hard gunmetal alloy is used for more demanding fittings, plain bearing shells and bushes, also for worm wheels with low sliding speeds. It has only moderate dry-running properties. |
| Important tempers |
Tensile Strength Rm N/mm² |
Yield Stress Rp0,2 N/mm² |
Elongation A % |
Hardness HB |
|
| G | ≥ 260 |
≥ 130 |
≥ 15 |
≥ 75 |
|
| Product with information obligations to REACH-Legislation | |||||
Comparable Specifications:: C90500 UNS G 1, BS 1400 |
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We also supply Plain Bearings to DIN 1850.
We supply:
GZ
GC
G resp. GS
GK resp. GM
GC
G resp. GS
GK resp. GM
= Centrifugal casting
= Continuous casting
= Sand casting
= Gravity die casting
= Continuous casting
= Sand casting
= Gravity die casting