Caro Bronze – CuSn8P DIN EN 12163/12167/12449

The high quality sliding material Caro Bronze is a drawn tin bronze with special alloy purity and high tin and phosphorus content. The complex, qualitatively demanding manufacturing process with multiple cold drawing operations produces a tribologically advantageous, fine-grained, homogeneous structure, which provides the following positive material properties:

Excellent sliding and emergency running properties.
Insensitive to shock and impact stress.
High wear and fatigue strength.
High resistance to erosion and cavitation.
Corrosion and seawater resistance.

Caro Bronze is an ideal material for highly stressed plain bearings. The mechanical values remain practically unchanged up to 280°C. The manufacturing technology used for Caro Bronze guarantees tubes and bars of great precision and tight tolerances. This allows the smallest machining allowances. This means low material usage and reduced machining costs.

Chemical composition (DIN EN 12163:2016-11)

Element	Cu	Sn	P	Ni	Zn	Fe	Pb	Other
Min. [%]	-	7.5	0.2	-	-	-	-	-	CuSn8P
Max. [%]	Rest	8.5	0.4	0.3	0.3	0.1	0.05	0.2	CW459K
Min. [%]	-	7.5	0.01	-	-	-	-	-	CuSn8
Max. [%]	Rest	8.5	0.4	0.2	0.2	0.1	0.02	0.2	CW453K

Mechanical properties

		R460S Tubes till ID Ø 107,9 mm	H130S Tubes bigger than ID Ø 108,0 mm	R450S Round, Square, Flat, Hexagonal
Yield point R_p0,2	[N/mm²]	≥ 280	-	≥ 280
Tensile strength R_m	[N/mm²]	≥ 460	-	≥ 450
Brinell hardness	[HB]	-	≥ 130	-
Elongation at fracture A	[%]	≥ 30	-	≥ 26
Modulus of elasticity* E	[N/mm²]	115	115	115

* Guideline value

Notes:

In accordance with DIN EN 12449 respectively 12163 are different tempers properties for tubes and round bars defined. The listed condition from 460 N/mm² respectively 450 N/mm² is a great advantage for most applications between hardness and anti-friction property. Different parameters can be agreed and customer wishes can be considered.

Physical properties (Guideline values)

Coefficient of thermal expansion	[10^-6/K]	17	Electrical conductivity	[m/Wmm²]	5
Thermal conductivity	[W/mK]	59	Specific gravity	[kg/dm³]	8.8

Standards

DIN EN 12163/12449/12167	CuSn8P	ASTM	Alloy C 52100
DIN 17662/17671/17672	CuSn8	SAE	CA 521
AFNOR	UE 9 P	BS	Alloy PB 104

Material designation

DIN EN 12163		DIN 17662
Abbreviated designation	Number	Abbreviated designation	Nummer
CuSn8P/CuSn8	CW459K/CW453K	CuSn8	2.1030

Forms of delivery

	Range [mm]	Tolerance [mm]
Round bars	Ø 3 – 30 Ø 32 – 90 Ø 102 – 125	h9 h10 0 / -0,3
Square bars	all	h11
Hexagonal bars	all	h11
Flat bars	all	according to DIN 1759 material group II

Example uses

Thin-walled plain bearings and sliding elements for the highest demands.
Spindle nuts, gear wheels, worm wheels, pinions.
Corrosion and wear-resistant structural parts such as bolts, screws and nuts.
Piston pumps, construction machinery, agricultural machinery, engine manufacturing, vehicle construction, mining machinery, printing machines, injection moulding machines, compressors, earthmoving machinery, gear manufacturing, wagon construction, eccentric and toggle drives, machine tools, hydraulic systems, shipbuilding, aerospace, industrial furnace construction, chemical industry, jig making, packaging machines, pneumatic systems, apparatus construction, locks and weir systems.

Manchinability

Caro Bronze bars and tubes are precisely cold drawn with small diameter tolerances and are very suitable for processing on dispensing machines.
This tough, high strength material is not one of the easily machinable copper alloys and can form longer flow chips when turning. Hence the choice of cutting materials and the cutting geometry are of the utmost importance for the machining result. Ask for our machining sheet for Caro Bronze.
This alloy is suitable for welding; however, structural changes in the weld area cannot be avoided. Hard soldering is preferable. Corrosion-resistant, solid compounds can be achieved, preferably with low-melting silver solders.

Sliding partners

As mating materials, hardened steels are required for higher loads. For many practical applications, the surface roughness should not exceed around Rz = 2-4 microns.

Caro Bronze - Availability

- Over 225 sizes of tubular, round, flat, rectangular and hexagonal bars are available.
- Custom production with different strengths and delivery dimensions.
- 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 uner download.

Material data sheet
Caro Bronze
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