DIN 1705

6/24/2014

Bushings

Lagermetall

Cast bronze

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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]

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