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UNS C51900 R350

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Description

CuSn6 provides an excellent combination of strength, cold formability and hardness. It is wear resistant, has good corrosion resistance and soldering properties. Due to its high strength and good spring properties combined with good machining properties it is used for all kind of springs, Bourdon tubes or flexible metal tubes.

Equivalent Materials

This material data has been provided by Matmatch.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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Properties

General

PropertyTemperatureValue

Density

23.0 °C

8.8 g/cm³

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Mechanical

PropertyTemperatureValueComment

Bendability 90°, bw

23.0 °C

0 [-]

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r = x t, t <0.5mm

Bendability 90°, gw

23.0 °C

0 [-]

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r = x t, t <0.5mm

Elastic modulus

23.0 °C

102 - 118 GPa

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depending on the condition

Elongation A50

23.0 °C

45 %

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Hardness, Vickers

23.0 °C

80 - 120 [-]

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Tensile strength

23.0 °C

350 - 420 MPa

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Yield strength Rp0.2

23.0 °C

300 MPa

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max.

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100.0 °C

1.8E-5 1/K

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for 20°C to the mentioned temperature

200.0 °C

1.85E-5 1/K

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for 20°C to the mentioned temperature

Specific heat capacity

23.0 °C

377 J/(kg·K)

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Thermal conductivity

23.0 °C

75 W/(m·K)

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Electrical

PropertyTemperatureValueComment

Electrical conductivity

23.0 °C

9.00E+6 - 1.50E+7 S/m

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min.

Specific Electrical conductivity

15.5 % IACS

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min.

Chemical properties

PropertyValueComment

Copper

Balance

Iron

0.1 %

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max.

Lead

0 - 0.02 %

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Nickel

0 - 0.2 %

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Other

0 - 0.2 %

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Phosphorus

0.01 - 0.4 %

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Tin

5.5 - 7 %

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Zinc

0 - 0.2 %

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Technological properties

Property
Application areas

Electrical: Miniaturized Connectors, Contact Springs, Relais Springs, Electrical Flexing Contact Blades, Terminals, Switch Parts, Fuse Clips, Electronic Connectors, Resistance Wire, Electromechanical Spring Components, Electrical Flexing Contact Blades, Wire Brushes, Switch Parts, Electronic and Precision Instrument Parts. Fasteners: Lock Washers, Cotter Pins, Fasteners. Industrial: Bourdon Tube, Bellows, Textile Machinery, Perforated Sheets, Springs, Sleeve Bushing, Clutch Disks, Beater Bar, Chemical Hardware. General: Stamped parts, Connectors, Contact springs, Spring elements, Ultra high strength spring elements, Membranes, Switch elements, Fixed contacts.

Brazing

Good

Cold Forming

Max. 70 % between annealings, excellent

Corrosion properties

CuSn6 has a good resistance to seawater, different agents and industrial atmosphere and has a good resistance to tarnishing. It is in a large extend resistant to pitting corrosion. Even in seawater the laminar attack is higher than localized corrosion.

Heat Treatment

Temper: R350

Hot forming

at 750-850°C, limited

Machining

Rating 20, less suitable

Other

This alloy is in accordance with RoHS 2002/96/CE for electric & electronic equipments and 2002/53/CE for automotive industry.

Plating

Electroplating is excellent

Welding

Gas Shielded Arc Welding: Good, Laser Welding: Good