C521 Bronze (CuSn8)

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Overview

Alloy C521 is a high tin alloy of the phosphor bronze family. The additional tin relative to the more commonly used C510 results in higher mechanical properties with a modest reduction in electrical conductivity. Applications include electronic parts, springs, contacts, switch parts and fasteners.

Physical Properties

Annealing Range (Min) 900 °F
Annealing Range (Max) 1250 °F
Density 0.318 lb/in³
Electrical Resistivity (Annealed) 79.8 Ω·cir-mil/ft @ 68 °F
Electrical Conductivity (Annealed) 13% IACS @ 68 °F
Thermal Conductivity 36 Btu/ft²/ft·hr/°F @ 68 °F
Coefficient of Thermal Expansion 10.1 per °F (68-572 °F)
Modulus of Elasticity (Tension) 16 ksi
Modulus of Rigidity (Tension) 6 ksi
Melting Point (Solidus) 1,700 °F
Melting Point (Liquidus) 1,900 °F
Annealing Range (Min) 482 °C
Annealing Range (Max) 677 °C
Density 8.94 gm/cm³
Electrical Resistivity (Annealed) 13.26 µΩ·cm @ 20 °C
Electrical Conductivity (Annealed) 0.08 MS·cm @ 20 °C
Thermal Conductivity 62 W/m·K @ 20 °C
Coefficient of Thermal Expansion 18.2 per °C (20-300 °C)
Modulus of Elasticity (Tension) 110 Mpa
Modulus of Rigidity (Tension) 41 Mpa
Melting Point (Solidus) 927 °C
Melting Point (Liquidus) 1,038 °C

Round Wire

TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)
MILL LIMITS
(inch)
Min Max
Annealed   53.0 68.0 .0010 - .1285 inch
1/4 Hard H01 74.0 91.0
1/2 Hard H02 95.0 115
3/4 Hard H03 113 135
Hard H04 125 150
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
Annealed   360 470 .0254 - 3.264 mm
1/4 Hard H01 510 630
1/2 Hard H02 650 800
3/4 Hard H03 770 940
Hard H04 860 1,040

Square Wire

TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)
MILL LIMITS
(inch)
Min Max
Annealed   53.0 68.0 .0100 - .0808 inch 
1/4 Hard H01 74.0 91.0
1/2 Hard H02 95.0 115
3/4 Hard H03 113 135
Hard H04 125 150
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
Annealed   360 470 .2540 - 1.905 mm
1/4 Hard H01 510 630
1/2 Hard H02 650 800
3/4 Hard H03 770 940
Hard H04 860 1,040

Rolled Flat

TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)
MILL LIMITS
(inch)
Min Max
Annealed   53.0 67.0 Thickness:
.0100 - .0500 inch

Width:
.0150 - .2500 inch
1/2 Hard H02 69.0 84.0
Hard H04 85.0 100
Extra Hard H06 97.0 112
Spring H08 105 119
Extra Spring H10 110 122
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
Annealed   360 470 Thickness:
.2540 - 1.905 mm

Width:
.3810 - 6.350 mm
1/2 Hard H02 470 580
Hard H04 580 690
Extra Hard H06 660 780
Spring H08 720 830
Extra Spring H10 750 850

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