C172 Beryllium Copper (CuBe2)

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Overview

Beryllium Copper alloys combine formability with very high strength properties when aged. Applications are in springs, connectors, switches and automotive parts. Special heat treating of the wire at the mill produces a “Mill Hardened” (HM) tempered Beryllium Copper wire which can then be formed and used without additional heat treatment.

Physical Properties

Annealing Range (Min) 1425 °F
Annealing Range (Max) 1475 °F
Density 0.298 lb/in³
Electrical Resistivity (Annealed) 47.1 Ω·cir-mil/ft @ 68 °F
Electrical Conductivity (Annealed) 22% IACS @ 68 °F
Thermal Conductivity 62 Btu/ft²/ft·hr/°F @ 68 °F
Coefficient of Thermal Expansion 9.9 per °F (68-572 °F)
Modulus of Elasticity (Tension) 19 ksi
Modulus of Rigidity (Tension) 7 ksi
Melting Point (Solidus) 1,700 °F
Melting Point (Liquidus) 1,900 °F
Annealing Range (Min) 774 °C
Annealing Range (Max) 802 °C
Density 8.94 gm/cm³
Electrical Resistivity (Annealed) 7.84 µΩ·cm @ 20 °C
Electrical Conductivity (Annealed) 0.13 MS·cm @ 20 °C
Thermal Conductivity 107 W/m·K @ 20 °C
Coefficient of Thermal Expansion 17.8 per °C (20-300 °C)
Modulus of Elasticity (Tension) 131 Mpa
Modulus of Rigidity (Tension) 50 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 TB00 58.0 78.0 .0010 - .1285 inch
1/4 Hard TD01 90.0 115
1/2 Hard TD02 110 135
3/4 Hard TD03 130 155
Hard TD04 140 165
AT TF00 160 200
1/4 HT TH01 175 210
1/2 HT TH02 185 215
3/4 HT TH03 190 230
HT TH04 195 230
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
Annealed TB00 390 540 .0254 - 3.264 mm
1/4 Hard TD01 620 800
1/2 Hard TD02 750 940
3/4 Hard TD03 890 1,070
Hard TD04 960 1,140
AT TF00 1,100 1,380
1/4 HT TH01 1,200 1,450
1/2 HT TH02 1,270 1,490
3/4 HT TH03 1,310 1,590
HT TH04 1,340 1,590

Square Wire

TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)
MILL LIMITS
(inch)
Min Max
Annealed TB00 58.0 78.0 .0100 - .0808 inch 
1/4 Hard TD01 90.0 115
1/2 Hard TD02 110 135
3/4 Hard TD03 130 155
Hard TD04 140 165
AT TF00 160 200
1/4 HT TH01 175 210
1/2 HT TH02 185 215
3/4 HT TH03 190 230
HT TH04 195 230
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
Annealed TB00 390 540 .2540 - 1.905 mm
1/4 Hard TD01 620 800
1/2 Hard TD02 750 940
3/4 Hard TD03 890 1,070
Hard TD04 960 1,140
AT TF00 1,100 1,380
1/4 HT TH01 1,200 1,450
1/2 HT TH02 1,270 1,490
3/4 HT TH03 1,310 1,590
HT TH04 1,340 1,590

Rolled Flat

TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)
MILL LIMITS
(inch)
Min Max
Annealed TB00 60.0 78.0 Thickness:
.0100 - .0500 inch

Width:
.0150 - .2500 inch
1/4 Hard TD01 75.0 88.0
1/2 Hard TD02 85.0 100
Hard TD04 100 130
AT TF00 165 195
1/4 HT TH01 175 205
1/2 HT TH02 185 215
HT TH04 195 220
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
Annealed TB00 410 540 Thickness:
.2540 - 1.905 mm

Width:
.3810 - 6.350 mm
1/4 Hard TD01 510 610
1/2 Hard TD02 580 690
Hard TD04 680 900
AT TF00 1,130 1,350
1/4 HT TH01 1,200 1,420
1/2 HT TH02 1,270 1,490
HT TH04 1,340 1,520

Round Wire - Pretempered

TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)
MILL LIMITS
(inch)
Min Max
1/8 Hard TL00 90.0 120  
1/4 Hard TL01 110 140 Most sizes available
1/2 Hard TL02 135 160 .0808" and below
Hard TL04 150 175 .0571" and below
Extra Hard TL06 165 190 .0403" and below
Spring TL08 180 205 .0253" or below
Special Spring TL10 195 230 .0100" and below
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
1/8 Hard TL00 620 830  
1/4 Hard TL01 750 970  
1/2 Hard TL02 930 1,110 2.05mm and below
Hard TL04 1,030 1,210 1.45mm and below
Extra Hard TL06 1,130 1,320 1.02mm and below
Spring TL08 1,240 1,420 0.64mm and below
Special Spring TL10 1,340 1,590 0.25mm and below

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