Copper Alloys Silicon Bronze C64700

Product Data Sheets – Copper Alloys

Silicon Bronze  UNS-C64700

C64700 is a copper nickel silicon alloy, known as a silicon bronze, which is typically used in resistance welding electrodes, for brazing and as fasteners.

It is a precipitation hardening alloy, which can also be cold worked for higher strength.

Chemical Composition

% Maximum, unless shown as range or minimum

Copper Iron Lead Nickel Silicon Zinc
Min/Max
Remainder
0.10
0.10
1.6-2.2
0.40-0.8
0.50
Nominal
97.5
1.9
0.6

(1) Copper value includes Silver

(2) Nickel value includes Cobalt

Note: Copper + Sum of named elements, 99.5% minimum

Applicable Specifications

Product Specification
Bar
ASTM B411
Rod
ASTM B411
Wire
ASTM B412

Common Fabrication Processes

No information available

Fabrication Properties

No information available

 Mechanical Properties

in the TF00 (precipitation hardened) Temper – Room Temperature 20°C

Form
Diameter
distance between surfaces
Tensile Strength
Yield Strength
0.5% extension under load
Elongation in 4D
mm
Minimum MPa
Minimum MPa
Minimum %
Round Rod
2.38-38.1
620
515
8
38.2-50.8
550
485
8
Hexagonal & Octagonal Bar
3.18-38.1
620
515
8
38.2-50.8
550
485
8
Square Bar
4.78-25.4
620
515
8
25.4-38.1
550
485
8
Rectangular Bar
4.78-38.1
550
485
8
Round, Hexagon & Octagonal Wire
1.02-19.0
620
515
5
Square Wire
< 4.775 thick
620
515
5
Rectangular Wire
< 31.75 wide
620
485
5

Physical Properties

Property
Metric Units
Density
8.91 g/cm³ @ 20°C
Specific Gravity
8.91
TF00 Resistivity (precipitation hardened)
0.34836-0.5854 ohms . g/m2
TF00 Conductivity (precipitation hardened)
44.0-26.0 % IACS

Tempers Most Commonly Used

TB00
Solution Heat Treated
TF00
Precipitation Hardened
TD00
Solution Heat Treated and Cold Worked, 1/8 Hard
TD01
Solution Heat Treated and Cold Worked, 1/4 Hard
TD02
Solution Heat Treated and Cold Worked, 1/2 Hard
TD03
Solution Heat Treated and Cold Worked, 3/4 Hard
TD04
Solution Heat Treated and Cold Worked, Full Hard

Typical Uses

 

Electrical

Resistance Welding Electrodes (electrical conductivity, oxidation resistance, resistance to thermal softening), Motor Rotor Bar (electrical resistivity, brazability)

 

Fasteners

Fasteners (electrical conductivity, high strength, heat treatable)

 

Industrial

Brazing Rod, Welding Rod (electrical and thermal conductivity, resistance to thermal softening)

 

The technical advice and recommendations made in this Product Data Sheet should not be relied or acted upon without conducting your own further investigations, including corrosion exposure tests where needed. Please consult current editions of standards for design properties. Austral Wright Metals assumes no liability in connection with the information in this Product Data Sheet. Austral Wright Metals supplies a comprehensive range of stainless steels, copper alloys, nickel alloys and other high performance metals for challenging service conditions. Our engineers and metallurgists will be pleased to provide further data and applications advice.

 

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