C72900 Copper Nickel Tin (spinodal)

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Overview

C72900 is a high strength alloy which attains its properties from aging via spinodal decomposition after cold working. The alloy can achieve strength levels similar to beryllium copper, but with much better resistance to thermal stress relaxation, especially at temperatures above 200 F, making it a viable alternative in a number of applications. In addition to selective hardening capabilities, C72900 contains no beryllium and is both ecologically neutral and fully recyclable without restriction.

Physical Properties

ENGLISH UNITS METRIC UNITS
Annealing Range (Min) 1515 °F
Density 0.323 lb/in³
Electrical Conductivity (Age Hardened) 7.8% IACS @ 68 °F
Thermal Conductivity 17 Btu/ft²/ft·hr/°F @ 68 °F
Coefficient of Thermal Expansion 9.1 per °F (68-572 °F)
Modulus of Elasticity (Tension) 18 ksi
Modulus of Rigidity (Tension) 7 ksi
Melting Point (Solidus) 1,620 °F
Melting Point (Liquidus) 1,880 °F
Annealing Range (Min) 824 °C
Annealing Range (Max) -18 °C
Density 8.94 gm/cm³
Electrical Conductivity (Age Hardened) 0.05 MS·cm @ 20 °C
Thermal Conductivity 29 W/m·K @ 20 °C
Coefficient of Thermal Expansion 16.4 per °C (20-300 °C)
Modulus of Elasticity (Tension) 128 Mpa
Modulus of Rigidity (Tension) 51 Mpa
Melting Point (Solidus) 882 °C
Melting Point (Liquidus) 1,027 °C

Round Wire

ENGLISH UNITS METRIC UNITS
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)		 MILL LIMITS
(inch)
Min Max
Annealed TB00 64.0 85.0 .0010 - .1285 inch
1/4 Hard TD01 75.0 100
1/2 Hard TD02 85.0 110
3/4 Hard TD03 95.0 120
Hard TD04 100 130
Spring TD08 122 145
Special Spring TD12 135 155
TS TX00 120 150
1/4 TS TS01 130 160
1/2 TS TS01 145 175
3/4 TS TS03 155 185
Hard TS TS04 165 195
Spring TS TS08 175 205
Special Spring TS TS12 180 225
AM TM00 95.0 115
1/2 HM TM02 105 125
HM TM04 115 135
XHM TM06 130 150
XHMS TM08 150 180
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)		 MILL LIMITS
(mm)
Min Max
Annealed TB00 440 590 .0254 - 3.264 mm
1/4 Hard TD01 510 690
1/2 Hard TD02 580 760
3/4 Hard TD03 650 830
Hard TD04 680 900
Spring TD08 840 1,000
Special Spring TD12 930 1,070
TS TX00 820 1,040
1/4 TS TS01 890 1,110
1/2 TS TS01 990 1,210
3/4 TS TS03 1,060 1,280
Hard TS TS04 1,130 1,350
Spring TS TS08 1,200 1,420
Special Spring TS TS12 1,240 1,560
AM TM00 650 800
1/2 HM TM02 720 870
HM TM04 790 940
XHM TM06 890 1,040
XHMS TM08 1,030 1,250

Square Wire

ENGLISH UNITS METRIC UNITS
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)		 MILL LIMITS
(inch)
Min Max
Annealed TB00 64.0 85.0 .0100 - .0808 inch 
1/4 Hard TD01 75.0 100
1/2 Hard TD02 85.0 110
3/4 Hard TD03 95.0 120
Hard TD04 100 130
Spring TD08 122 145
Special Spring TD12 135 155
TS TX00 120 150
1/4 TS TS01 130 160
1/2 TS TS01 145 175
3/4 TS TS03 155 185
Hard TS TS04 165 195
Spring TS TS08 175 205
Special Spring TS TS12 180 225
AM TM00 95.0 115
1/2 HM TM02 105 125
HM TM04 115 135
XHM TM06 130 150
XHMS TM08 150 180
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)		 MILL LIMITS
(mm)
Min Max
Annealed TB00 440 590 .2540 - 1.905 mm
1/4 Hard TD01 510 690
1/2 Hard TD02 580 760
3/4 Hard TD03 650 830
Hard TD04 680 900
Spring TD08 840 1,000
Special Spring TD12 930 1,070
TS TX00 820 1,040
1/4 TS TS01 890 1,110
1/2 TS TS01 990 1,210
3/4 TS TS03 1,060 1,280
Hard TS TS04 1,130 1,350
Spring TS TS08 1,200 1,420
Special Spring TS TS12 1,240 1,560
AM TM00 650 800
1/2 HM TM02 720 870
HM TM04 790 940
XHM TM06 890 1,040
XHMS TM08 1,030 1,250

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