6/24/2014
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Materialsheet DIN 1705 Rg 7 Gunmetal (Comp. norms: SAE 660, ISO CuSn7Pb7Zn4, CuSn7) Main elements (nom. values) Cu Sn Pb Zn
81-85 % 6-8 % 5-7 % 3-5 %
Max. impurities: Ni 2,0 % (can be part of the C u-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 leadcontent), 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 Hµm
Turning
http://www.lagermetall.com/bronze/redmet2.aspx
Hard metal 16 Qual. H20 4
Raµm 4 1
Nose radius mm
Cutting Speed m/min
Feeding mm/revs
0,4 0,8
285-360
0,15 0,08
1/2
6/24/2014
Lagermetall Drilling Ø 2-60mm
High speed Boring tool
70
0,08-0,40
Milling Ø 63 mm 6 cuts
Hard metal 16 Qual. H20 4
4 1
Rpm 1200
mm/min 800 550
Milling Ø 100 mm 8 cuts
Hard metal 16 Qual. H20 4
4 1
1000
1000 675
Milling Ø 160 mm 12 cuts
Hard metal 16 Qual. H20 4
4 1
650
1100 700
Milling Ø 200 mm 14 cuts
Hard metal 16 Qual. H20 4
4 1
500
850 550
Lagermetall AB • Boskärsgatan 23 • 702 25 Örebro, SWEDEN • Tel. +46 (0)19 20 96 60 • Fax +46 (0)19 12 38 55 •
[email protected]
http://www.lagermetall.com/bronze/redmet2.aspx
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