Looser Bronze 65

Looser Bronze 65 (LB 65) – CuSn12-C-GS/GC/GZ DIN EN 1982

Looser Bronze 65 is a hard and tough material with high wear resistance and good antifriction properties. It is insensitive to shock and is seawater-resistant, corrosion-resistant and cavitation-resistant.

Example uses

Continuous casting and centrifugal casting:

Highly loaded, high-speed worm gear rims for general gear manufacture. Particularly well-suited to lift and escalator drives owing to high safety. Spindle nuts moved under load, highly loaded plain bearings in machine tools.
Highly loaded sliding plates and wear plates, thrust washers and piston-pin bushings, pistons and pump bodies for oil and water hydraulics, highly loaded coupling blocks. Sliding speeds up to v = 20 m/s are permitted with hydrodynamic lubrication.
Sliding speeds up to v = 20 m/s are permitted with hydrodynamic lubrication.

Mould casting:

Particularly suitable for structural parts which must simultaneously withstand surface pressures and shocks and are subject to frictional wear, e.g. highly loaded coupling, articulated or slide blocks and spindle nuts moved under load, worm gears subject to low and moderate load.

Chemical composition (DIN EN 1982:2017-11)

Element	Cu*	Sn	Ni	Pb	P	Zn	Fe	Mn	Sb	S	AI	Si
Min. [%]	85	10.7	-	-	-	-	-	-	-	-	-	-
Max. [%]	89	13	2	0.7	0.6	0.5	0.2	0.2	0.15	0.05	0.01	0.01

Mechanical properties (DIN EN 1982:2017-11)

		Continuous casting-GC	Centrifugal casting-GZ
Yield point R_p0,2	[N/mm²]	≥ 150	≥ 150
Tensile strength R_m	[N/mm²]	≥ 300	≥ 280
Brinell hardness	[HB]	≥ 90	≥ 90
Elongation at fracture A	[%]	≥ 6	≥ 6
Bending fatigue strength* R_bw	[N/mm²]	± 90	± 90
Modulus of elasticity** E	[kN/mm²]	90	90

* Guideline value with 10⁸ load cycles and at 20°C / ** Guideline value

The sample bar is removed from the casting in the case of centrifugal castings and continuous castings. The sample position – e.g. lengthwise or crosswise sample – must be agreed between orderer and manufacturer: the values specified in the table apply only to wall thicknesses up to 50 mm for the blank casting. In the case of wall thicknesses over 50 mm, with the wall thickness of the blank casting being the decisive factor, it must be anticipated that the strength and hardness values are lower. This applies in particular to the yield point.
It must not be expected that the strength and hardness values are uniformly high at all points of the casting. In general, the values in the outer layers will be higher than in the core zone.

Worm-gear loading characteristics (c values)

	Centrifugal casting	Mould casting
Continuous operation without cooling	7,5 N/mm² with v = 2 m/s 2 N/mm² with v = 8 m/s	6 N/mm² with v = 2 m/s 2,5 N/mm² with v = 4 m/s
Continuous operation with cooling	8 N/mm² with v = 2 m/s 10 N/mm² with v = 8 m/s	6,5 N/mm² with v = 2 m/s 7,5 N/mm² with v = 4 m/s
Short duty cycle [ED]	40 N/mm² (ED max. 5%)	30 N/mm² (ED max. 5%)

Physical properties (GUideline values)

Coefficient of thermal expansion	[10^-6/K]	18,5	Electrical conductivity	[m/Wmm²]	6.2
Thermal conductivity	[W/mK]	54	Specific gravity	[kg/dm³]	8.6

Standards

DIN EN 1982	CuSn12-C-GS/GC/GZ	DIN 1705	G-CuSn10 (G-SnBz10)
DIN 1705	G/GC/GZ-CuSn12	ASTM	Alloy C 90500, C 90700
VSM 10810	G-CuSn10 (GBz10)	SAE	CA 905 B (65)

Material designation

DIN EN 1982			DIN 1705
Abbreviated designation	Number	Casting method	Abbreviated designation	Number
CuSn12-C-GS	CC483K-GS	GS or G	G-CuSn12	2.1052.01
CuSn12-C-GZ	CC483K-GZ	GZ	GZ-CuSn12	2.1052.03
CuSn12C-GC	CC483K-GC	GC	GC-CuSn12	2.1052.04

GS = G = Sand casting; GZ = Centrifugal casting; GC = Continuous casting

Machinability

Can be machined satisfactorily by metal cutting, easily welded, easily soldered and conditionally suitable for brazing.

Sliding partners

Surface-hardened shafts are advisable owing to the high hardness and wear resistance (min. HRC 56–58). They should be neatly ground and they should have an ultra-finely-ground finish if subject to very high loads. Cast iron with spheroidal graphite is also a suitable shaft material. Edge pressure must be avoided.

Looser Bronze 65 – Availability

Over 280 sizes of tubular, round, flat and rectangular bars.
Additional sizes – specifically edge profiles – are available at short notice.
Centrifuged rings and bushings pre-turned to the rough sizes or contour.
Edge profiles sawn to the required sizes from baseplates.
Special continuous-casting production processes for hollow and solid profiles as of 1,000 kg per size.
Ready-to-install parts in accordance with customer drawing.

We will be more than pleased to advise you.

Subject to technical modifications; no responsibility is accepted for the accuracy of this information.

Links

Additional information can be found in this Looser Bronzen catalogue or under download.

Material data sheet
Looser Broonze 65
PDF

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