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Beryllium Copper Wrought

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Properties and Tolerance of Rod and Wire

Properties of Rod

Alloy Temper Symbol 1) Diameter or Distanse of Subtense Tensile 2) Hardness 3) Electrical conductivity 5)
(%IACS)		 Heat treatment °C × hrs
Tensile strength N/mm2 Elongation % Vickers Hv 4)(0.2min.) Rockwell
HRB HRC
25 Age Hardenable
O C1720B-O 1 incl. 6 and under 410 - 590 - 90 - 190 - - 17min. -
6 over 35 and under 410 - 590 - 90 - 190 45 - 85 - 17min. -
H C1720B-H 1 incl. 6 and under 645 - 900 - 180 - 300 - - 15min. -
6 over 35 and under 590 - 900 - 175 - 330 80 - 103 - 15min. -
After Age hardening
OT C1720B-OT 1 incl. 6 and under 1100 - 1380 - 300 - 400 - - 22min. 315°C × 3h
6 over 35 and under 1100 - 1380 - 300 - 400 - 34 - 40 22min. 315°C × 3h
HT C1720B-HT 1 incl. 6 and under 1270 - 1650 - 340 - 440 - - 22min. 315°C × 2h
6 over 35 and under 1210 - 1620 - 330 - 430 - 37 - 45 22min. 315°C × 3h 6)
25-K Age Hardenable
H BeCuBK-H 1 incl. 6 and under 645 - 900 - 180 - 300 - - 15min. -
After Age Hardening
HT BeCuBH-HT 1 incl. 6 and under 1270 - 1650 - 340 - 440 - - 22min. 315°C × 2h
11 Age Hardenable
H BeCuB11-H 1 incl. 6 and under 490 - 635 - 130 - 190 - - 30min. -
After Age Hardening
HT BeCuB11-HT 1 incl. 6 and under 760 - 965 - 230 - 280 - - 50min. 450°C × 2h
10 Age Hardenable
H BeCuB10-H 3 incl. 6 and under 490 - 635 - 130 - 190 - - 20min. -
After Age Hardening
HT BeCu10-HT 3 incl. 6 and under 760 - 965 - 230 - 280 - - 48min. 480°C × 2h

1) B:Bar and Rod.
2),3) When hardness values are specified, tensile values shall be not specified
4) Vickers hardness are for design guidance only
5) Electrical conductivity are for design guidance only
6) 315°C x 2h when diameter or distance of subtense are under 19mm.

Properties of Wire

Alloy Temper Symbol 1) Tensile Electrical conductivity 2)(%IACS) Heat treatment °C × hrs
Diameter mm Tensile strength N/mm2) Elongation %
25 Age Hardenable
O C1720W-O 0.3min. 390 - 540 - - -
1/4H C1720W-1/4H 0.1min. 620 - 805 - - -
3/4H C1720W-3/4H 0.1min. 835 - 1070 - - -
After age hardening
OT C1720W-OT 0.3min. 1100 - 1380 - 20min. 315°C×3h
1/4HT C1720W-1/4HT 0.1min. 1210 - 1450 - 20min. 315°C×2h
3/4HT C1720W-3/4HT 0.1min. 1300 - 1590 - min. 20 315°C×1h

Tolerance of Rod, Wire

Rod (Machined) Wire
Diameter Tolerance Diameter Tolerance
1.0 incl. 2.5 and under +, -0.02 0.1 incl. 0.25 and under +, -0.005
2.5 over 3.5 and under +, -0.02 0.25 over. 0.3 and under +, -0.008
3.5 over 5 and under +, -0.02 0.3 over. 0.5 and under +, -0.010
5 over 10 and under +, -0.03 0.5 over. 1 and under +, -0.015
10 over 22 and under +, -0.04 1 over 2 and under +, -0.020
22 over 35 and under +, -0.10 2 over 3.5 and under +, -0.025
35 over 40 and under +, -0.12

Bar/Plate

Physical Properties of Beryllium Copper

Items Unit High Strength Alloy
BeA - 25 BeA - 165
Specific Gravity 8.26
Melting Points °C 865 - 980
Coefficent of Thermal Expansion (20 - 200°C) 17 × 10-6
Thermal Conductivity cal/cm2/cm/sec/°C 0.26 - 0.31
Volume Resistivity µΩ-cm 6.0 - 7.8
Electrical Conductivity lACS% 22 - 29
Specific Heat (30 - 300°C) cal/g/°C 0.1
Modulus of Elasticity kN/mm2 127
Magnetism none
Items Unit High Conductive Alloy
BeA - 10 BeA - 11 BeA - 50
Specific Gravity 8.75 8.75 8.83
Melting Points °C 1029 - 1070 1004 - 1070 1020 - 1110
Coefficent of Thermal Expansion (20 - 200°C) 17.6 × 10-6 17.6 × 10-6 17.6 × 10-6
Thermal Conductivity cal/cm2/cm/sec/°C 0.49 - 0.62 0.49 - 0.62 0.49 - 0.62
Volume Resistivity µΩ-cm 3.1 - 3.6 2.9 - 3.4 2.9 - 3.4
Electrical Conductivity lACS% 50 - 60 50 - 60 50 - 60
Specific Heat (30 - 300°C) cal/g/°C 0.1 0.1 0.1
Modulus of Elasticity kN/mm2 132 132 132
Magnetism none none none

Mechanical Properties of Beryllium Copper

Alloy Temper T/S 0.2% Yield Strength Elongation Hardness
N/mm2 N/mm2 % HR
BeA - 25 A 410 - 590 135 - 205 35 - 60 B 45 - 85
H 590 - 900 520 - 725 10 - 20 B 88 - 103
AT 1100 - 1375 930 - 1205 2 - 8 C 34 - 45
HT 1205 - 1470 1030 - 1375 2 - 5 C 37 - 45
BeA - 165 A 410 - 590 135 - 205 35 - 60 B 45 - 85
AT 980 - 1245 865 - 1060 2 - 10 C 32 - 40
BeA - 10 A 235 - 390 135 - 205 20 - 35 B 20 - 50
AT 685 - 835 490 - 685 10 - 25 B 92 - 105
BeA - 11 A 235 - 390 135 - 205 20 - 35 B 20 - 50
AT 685 - 885 490 - 685 10 - 25 B 92 - 105
BeA - 50 A 235 - 390 135 - 205 20 - 35 B 20 - 50
AT 685 - 835 490 - 685 8 - 20 B 92 - 105

A : Solution Annealed
AT : Solution Annealed + Age Hardened
H : Solution Annealed + Cold Worked
HT: Solution Annealed + Cold Worked + Age Hardened

Comperison of Mechanical Properties

Alloy T/S Rockwell Hardness Elongation Electrical Conductivity Thermal Cond.
N/mm2 R&C Scale % %IACS cal/cm2/cm/°C
BeA - 25 1175 C38 2 25 0.25
BeA - 50 785 B96 15 55 0.45
Aluminum Bronze 735 B90 18 10 0.13
Copper-Chromium Alloy 540 B75 15 80 0.77
High Strength Brass 590 B80 15 20 0.22
Phosphor Bronze 490 B70 20 10 0.13
18-8 Stainless Steel 635 B80 55 2 0.04
Steel 490 B70 50 8 0.1

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