UNS C70318 boway

Alternative and trade names
boway 70318
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Description

Very high strength combined with excellent electrical and thermal conductivity. Very good stress relaxation resistance, good solderability as well as good bending formability for this strength level. Not sensitive against stress corrosion cracking.

Equivalent Materials

This material data has been provided by Ningbo Boway Alloy Material.

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

PropertyValue

Density

8.85 g/cm³

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Dimension

PropertyValue

Dimensions

Strip thickness 0.08 - 0.20 mm, other gauges on request. Strip width from 9 mm. Electroplated and Hot-dip tinned strip available.

Mechanical

PropertyValueTesting StandardComment

Bendability 90°, bw

1 [-]

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EN ISO 7438

R690 (TM02) | bending thickness: 0.08-0.2 mm & bending width: 10 mm

1.5 [-]

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EN ISO 7438

R770 (TM04) | bending thickness: 0.08-0.2 mm & bending width: 10 mm

2 [-]

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EN ISO 7438

R840 (TM06) | bending thickness: 0.08-0.2 mm & bending width: 10 mm

Bendability 90°, gw

0.8 [-]

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EN ISO 7438

R690 (TM02) | bending thickness: 0.08-0.2 mm & bending width: 10 mm

1.5 [-]

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EN ISO 7438

R770 (TM04) | bending thickness: 0.08-0.2 mm & bending width: 10 mm

2 [-]

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EN ISO 7438

R840 (TM06) | bending thickness: 0.08-0.2 mm & bending width: 10 mm

Elastic modulus

130 GPa

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Elongation

1 %

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min. | R840 (TM06), A50

4 %

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min. | R770 (TM04), A50

6 %

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min. | R690 (TM02), A50

Hardness, Vickers

200 [-]

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min. | R690 (TM02) | For reference only

220 [-]

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min. | R770 (TM04) | For reference only

240 [-]

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min. | R840 (TM06) | For reference only

Poisson's ratio

0.33 [-]

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Tensile strength

690 - 830 MPa

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R690 (TM02)

770 - 900 MPa

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R770 (TM04)

840 - 970 MPa

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R840 (TM06)

Yield strength

680 MPa

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min. | R690 (TM02)

750 MPa

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min. | R770 (TM04)

810 MPa

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min. | R840 (TM06)

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

1.76e-05 1/K

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average value between 20-300°C

Specific heat capacity

380 J/(kg·K)

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Thermal conductivity

20 °C

190 W/(m·K)

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Electrical

PropertyTemperatureValue

Electrical conductivity

20 °C

0.0029 S/m

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Specific Electrical conductivity

20 °C

50 % IACS

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Chemical properties

PropertyValueComment

Cobalt

0.9 %

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Copper

Balance

Other

0.5

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max.

Silicon

0.9 %

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Technological properties

Property
Application areas

Application target:

Signal ConnectorWell suitable
Power ConnectorSuitable
Miniaturized ConnectorSuitable
Switch / RelayWell suitable
SemiconductorNot recommended


Well suited for BTB-Connectors, particularly for USB Type-C, relay springs, high speed connectors and others

Chemical composition

The chemical composition is the nominal composition of the alloy

Coating

Electroplating: Good


Hot dip tinning: Good

Cold Forming

Good

Machining

Less suitable

Packaging size

Standard coils with outside diameters up to 1300 mm. Traverse-wound coils with drum weights up to 500 Kg. Multiple-coil up to 3 tons

Soldering general

Soft soldering: Suitable

Testings

Fatigue strength:

The fatigue strength is defined as the maximum bending stress amplitude which a material withstands for 10.000.000 load cycles under symmetrical alternate load without breaking. It depends on the temper selected and can be estimated typically by 1/3 of tensile strength. For solid solution fine grain materials fatigue strength might increase up to 0,5 * of tensile strength.


Bending test:

90° bend test According to EN ISO 7438, 180° bend test acc. to ASTM B820, shown values might show orange- peel, however no crack.

Welding

Laser welding: Good


Resistance welding: Good