Materialsheet DIN 1705 Rg 7 Gunmetal
(Comp. norms: SAE 660, ISO CuSn7Pb7Zn4, CuSn7)
Main elements (nom. values)
- Cu 81-85 %
- Sn 6-8 %
- Pb 5-7 %
- Zn 3-5 %
Max. impurities:
- Ni 2,0 % (can be part of the Cu-cont.)
- Mn 0,2 %
- P 0,05 %
- Sb 0,2 %
- S 0,1 %
- Övr. 0,1 %
Mekaniska egenskaper
Sträckgräns (Rp N/mm 2 ): 120-150 N/mm 2
Brottgräns (Rm N/mm 2) ): 270-330 N/mm 2
Förlängning i % A 5 : 16-26 %
Hårdhet/Brinell: 70-85 HB
(Alla värden = Nominella värden)
Mechanical properties
Yield stress (Rp N/mm 2 ): 120-150 N/mm 2
Tensile strength (Rm N/mm 2 ): 270-330 N/mm 2
Elongation in %, A 5 : 16-26 %
Hardness/Brinell: 70-85 HB
Density ~ 8,8
Mating material: Min. surface hardness 165 HB Rec. surface roughness < 1 Ra.
Other information
Rg7 is not suited for welding. Soldering (hard-soldering) is not to recommend (due to its lead-content), but is possible. It is possible to glue. Easy to machine. Few sensitive to edge pressure.
Examples on areas of use
All sorts of bearings and sliding elements for general applications and medium stress. Saltwater resistant.
Guidelines for turning, drilling and milling of Rg 7 ( R ot g uß 7) Gunmetal
(normal working conditions is presumed)
| Work operations |
|
Surface
roughness |
Nose radius
mm |
Cutting Speed
m/min |
Feeding
mm/revs |
| Hµm |
Raµm |
| Turning |
Hard metal
Qual. H20 |
16
4 |
4
1 |
0,4
0,8 |
285-360 |
0,15
0,08 |
| Drilling Ø 2-60mm |
High speed
Boring tool |
|
|
|
70 |
0,08-0,40 |
| Milling Ø 63 mm 6 cuts |
Hard metal
Qual. H20 |
16
4 |
4
1 |
|
Rpm
1200 |
mm/min
800
550 |
| Milling Ø 100 mm 8 cuts |
Hard metal
Qual. H20 |
16
4 |
4
1 |
|
1000 |
1000
675 |
| Milling Ø 160 mm 12 cuts |
Hard metal
Qual. H20 |
16
4 |
4
1 |
|
650 |
1100
700 |
| Milling Ø 200 mm 14 cuts |
Hard metal
Qual. H20 |
16
4 |
4
1 |
|
500 |
850
550 |