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Features of Beryllium Copper

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(1) Forms, features and applications of Beryllium Copper Products

Properties for Strip applications at a glance

Properties for Strip applications at a glance

Properties for Rod applications at a glance

Properties for Rod applications at a glance

(2) Chemical composition and Physical Properties

Chemical Composition

NGK AlloyChemical Composition (wt%)Major FeaturesForm
25 Be
Ni+Co
Ni+Co+Fe
Cu+Be+Ni+Co+Fe		 1.80-2.00
min.0.20
max.0.60
min.99.5		 High strength
High Fatigue strength
High electrical conductivity
Wear resistance
Nonmagnetic		 Cold worked
Strip, Bar, Wire
Hot Worked
Plate, Rod
8·11 Be
Ni
Cu+Be+Ni		 0.20-0.60
1.40-2.20
99.5min.		 High electrical conductivity
High fatigue strength
High strength
Nonmagnetic
7 Be
Ni+Co
Al
Cu+Be+Ni+Co+Al		 0.20-0.40
1.80-2.50
max.0.60
min.99.0		 Cold worked
Strip

Physical Properties

ItemNGK Alloy 25NGK Alloy 8·11NGK Alloy 7
Melting Point (solidus) °C 865 1004 1050
Melting Point (liquidus) °C 980 1070 1081
Density g/cm3 at 20°C 8.26 8.75 8.71
Specific Heat J/(kg·K) at 20°C 419 419 419
Thermal Expansion Coefficient /°C at 20~300°C 17.8x10-6 17.6x10-6 17.6x10-6
Thermal Conductivity W/(m·K) at 20°C 83.7-130 167-260 148-194
Electrical Conductivity %IACS at 20°C 25 63·55 38
Modulus of Elasticity kN/mm2 127 132 127
Modulus of Rigidity kN/mm2 49 52 49
Poison's Ratio 0.3 0.3 0.3
Magnetic Permeability µ(µ=1+4pk) 1.000042 1.000031 1.000027

(3) Properties and Tolerances of High Strength Material (Alloy 25)

Properties of Strip

AlloyTemperDesignation 8)Tensile test 1)
Tensile strength (N/mm2)Yield strength 0.2% offset (N/mm2)Elongation (%)
25 Age Hardenable 6) Before age hardening
O C1720P-OｷC1720R-O 410 - 540 - min. 35
1/4H C1720P-1/4HｷC1720R-1/4H 510 - 620 - min. 10
1/2H C1720P-1/2HｷC1720R-1/2H 590 - 695 - min. 5
H C1720P-HｷC1720R-H 685 - 835 - min. 2
After age hardening
OT C1720P-OTｷC1720R-OT 1100 - 1380 4) min. 960 min. 3
1/4HT C1720P-1/4HTｷC1720R-1/4HT 1180 - 1400 4) min. 1030 min. 2
1/2HT C1720P-1/2HTｷC1720R-1/2HT 1240 - 1440 4) min. 1100 min. 2
HT C1720P-HTｷC1720R-HT 1270 - 1480 4) min. 1140 min. 1
Mill Hardened 6) (Standard) OM C1720P-OMｷC1720R-OM 685 - 885 5) min. 480 min. 18
1/4HM C1720P-1/4HMｷC1720R-1/4HM 735 - 930 5) min. 550 min. 10
1/2HM C1720P-1/2HMｷC1720R-1/2HM 815 - 1010 5) min. 650 min. 8
HM C1720P-HMｷC1720R-HM 910 - 1110 5) min. 750 min. 6
XHM C1720P-XHMｷC1720R-XHM 1100 - 1290 5) min. 930 min. 2
XHMS C1720P-XMHSｷC1720R-XMHS 1210 - 1400 5) min. 1030 min. 2
Mill Hardened 6)
TypeB (Good formability)		 OMB C1720P-OMBｷC1720R-OMB 640 - 760 5) 480 - 660 min. 16
1/4HMB C1720P-1/4HMBｷC1720R-1/4HMB 760 - 830 5) 550 - 760 min. 15
1/2HMB C1720P-1/2HMBｷC1720R-1/2HMB 830 - 930 5) 660 - 860 min. 12
HMB C1720P-HMBｷC1720R-HMB 930 - 1030 5) 760 - 930 min. 9
XHMB C1720P-XHMBｷC1720R-XHMB 1070 - 1210 5) 930 - 1170 min. 4
XHMSB C1720P-XMHSBｷC1720R-XMHSB 1210 - 1310 5) 1030 - 1240 min. 3
Mill Hardened 6) 7)
TypeS (Excellent formability)		 HM - TypeS C1720P-HM-TypeSｷC1720R-HM-TypeS min. 960 790 - 940 9 - 25
XHM - TypeS C1720P-XHM-TypeSｷC1720R-XHM-TypeS min. 1060 930 - 1070 6 - 22
AlloyTemperDesignation 8)Hardness test 2)Electrical conductivity
3)
(%IACS)		Heat treatment
Vickers hardness HV
25 Age Hardenable 6) Before age hardening
O C1720P-OｷC1720R-O 90 - 160 - -
1/4H C1720P-1/4HｷC1720R-1/4H 145 - 220 - -
1/2H C1720P-1/2HｷC1720R-1/2H 180 - 240 - -
H C1720P-HｷC1720R-H 210 - 270 - -
After age hardening
OT C1720P-OTｷC1720R-OT 350 - 400 min. 22 3hr.at315°C
1/4HT C1720P-1/4HTｷC1720R-1/4HT 360 - 430 min. 22 2.5hr.at315°C
1/2HT C1720P-1/2HTｷC1720R-1/2HT 370 - 440 min. 22 2hr.at315°C
HT C1720P-HTｷC1720R-HT 380 - 450 min. 22 2hr.at315°C
Mill Hardened 6) (Standard) OM C1720P-OMｷC1720R-OM 220 - 270 min. 20 -
1/4HM C1720P-1/4HMｷC1720R-1/4HM 235 - 285 min. 17 -
1/2HM C1720P-1/2HMｷC1720R-1/2HM 260 - 310 min. 17 -
HM C1720P-HMｷC1720R-HM 295 - 345 min. 17 -
XHM C1720P-XHMｷC1720R-XHM 340 - 390 min. 17 -
XHMS C1720P-XMHSｷC1720R-XMHS 360 - 410 min. 17 -
Mill Hardened 6)
TypeB (Good formability)		 OMB C1720P-OMBｷC1720R-OMB 190 - 250 min. 16 -
1/4HMB C1720P-1/4HMBｷC1720R-1/4HMB 215 - 280 min. 16 -
1/2HMB C1720P-1/2HMBｷC1720R-1/2HMB 255 - 310 min. 16 -
HMB C1720P-HMBｷC1720R-HMB 280 - 340 min. 17 -
XHMB C1720P-XHMBｷC1720R-XHMB 330 - 390 min. 17 -
XHMSB C1720P-XMHSBｷC1720R-XMHSB 360 - 410 min. 20 -
Mill Hardened 6) 7)
TypeS (Excellent formability)		 HM - TypeS C1720P-HM-TypeSｷC1720R-HM-TypeS 285 - 370 min. 17 -
XHM - TypeS C1720P-XHM-TypeSｷC1720R-XHM-TypeS 315 - 395 min. 17 -
  1. Values are applicable to thickness 0.1 mm and over.
  2. Values are applicable to thickness 0.1 mm and over.
  3. Electrical conductivity is for design guidance only.
  4. The upper limits of tensile strength after age hardening are for design guidance only.
  5. The upper limits of tensile strength of mill hardened strip are for design guidance only.
  6. See page 12 for bending formability.
  7. Contact us for purchase instructions.
  8. P and R in column "Designation" represent "strip cut to length" and "strip in coils"

Tolerances

Thickness tolerance(mm)

Specified thicknessTolerance
OverUp to and including
from 0.050 0.08 ±0.004
0.08 0.1 ±0.005
0.1 0.15 ±0.006
0.15 0.2 ±0.008
0.2 0.25 ±0.010
0.25 0.4 ±0.015
0.4 0.55 ±0.020
0.55 0.7 ±0.025
0.7 0.9 ±0.030
0.9 1.2 ±0.035
1.2 1.5 ±0.045
1.5 2.0 ±0.050
  • *note) When the tolerance is specified either plus or minus side only, the same range of tolerance shall be applied. In case of strip cut to length tolerance shall be determined individually.

Length tolerance(mm)

X axis:Speciied length; Y axis: Speciied thickness;Tolerance
OverUp to and includingmax. 1000
from 0.05 0.55 +8
-0
0.55 2.0 +10
-0

Width tolerance(mm)

X axis:Speciied width; Y axis: Speciied thickness;Tolerance
Strip cut to lengthStrip in coils
OverUp to and includingmax. 200max. 100Over 100 up toand including 200
from 0.050 0.55 +2
-0		 ±0.1 ±0.2
0.55 2.0 +2
-0		 ±0.2 ±0.3
  • *note) When the tolerance is specified either plus or minus side only, the same range of tolerance shall be applied.

Camber tolerance(mm)

Specified WidthMaximum value
OverUp to and includingOver 1000 length
From 4 13 4
13 50 3
50 100 2
100 200 1
Camber tolerance(mm)

(4) Properties and Tolerances of High Electrical Conductivity Material (Alloy 8 and Alloy 11)

Properties of Strip

AlloyTemperDesignation 5)Tensile test 1)Hardness test 2)Electrical conductivity
3)
(%IACS)
Tensile strength
(N/mm2)		Yield strength 0.2%offset (N/mm2)Elongation (%)Vickers hardness HV
8 HT 6) BeCuP08-HTｷBeCuR08-HT 700 - 870 4) min. 600 min. 5 210 - 260 min. 60
11 HT 6) BeCuP11-HTｷBeCuR11-HT 760 - 965 4) min. 655 min. 5 230 - 280 min. 50
  1. Values are applicable to thickness 0.1 mm and over.
  2. Values are applicable to thickness 0.1 mm and over.
  3. Electrical conductivity is for design guidance only.
  4. The upper limits of tensile strength are for design guidance only.
  5. P and R in column "Designation" represent "strip cut to length" and "strip in coils".
  6. "HT" is equivalent to "HM" under JIS (Japanese Industrial Standards)

Tolerances

Thickness tolerance of Alloy 8(mm)

  • *Standard thickness is only available for Alloy 8.
Specified thicknessTolerance
0.08 ±0.006
0.10 ±0.008
0.12 ±0.008
0.15 ±0.008
0.18 ±0.009
0.20 ±0.009
0.25 ±0.010
0.30 ±0.015

Thickness tolerance of Alloy 11(mm)

Specified thicknessTolerance
OverUp to and including
form 0.08 0.10 ±0.006
0.10 0.15 ±0.008
0.15 0.20 ±0.009
0.20 0.25 ±0.010
0.25 0.40 ±0.015
0.40 0.55 ±0.020
0.55 0.70 ±0.025
0.70 0.90 ±0.030
0.90 Up to 1.20 ±0.040
  • *note) When the tolerance is specified either plus or minus side only, the same range of tolerance shall be applied.
    In case of strip cut to length tolerance shall be determined individually.

Length tolerance(mm)

X axis:Speciied length; Y axis: Speciied thickness;Tolerance
FromUp to and includingmax. 1000
0.08 2.0 +10
-0

Width tolerance(mm)

X axis:Speciied width; Y axis: Speciied thickness;Tolerance
Strip cut to lengthStrip in coils
OverUp to and includingmax. 200max. 100Over 100 up toand including 200
from 0.08 0.55 +2
-0		 ±0.1 ±0.2
0.55 2.0 +2
-0		 ±0.2 ±0.3
  • *note) When the tolerance is specified either plus or minus side only, the same range of tolerance shall be applied.

Camber tolerance(mm)

Specified WidthMaximum value
OverUp to and includingOver 1000 length
From 4 13 4
13 50 3
50 100 2
100 200 1
Camber tolerance(mm)

(5) Properties and Tolerances of Midrange Material (Alloy 7)

Properties of Strip

AlloyTemperDesignation 5)Tensile test 1)Hardness test 2)Electrical conductivity
3) (%IACS)
Tensile strength
(N/mm2)		Yield strength 0.2%offset (N/mm2)Elongation (%)Vickers hardness HV
7 1/2HT BeCuP07-1/2HTｷBeCuR07-1/2HT 670 - 800 4) 550 - 760 min. 10 195 - 250 min. 38
HT BeCuP07-HTｷBeCuR07-HT 765 - 900 4) 686 - 834 min. 8 220 - 275 min. 33
EHT BeCuP07-E2HTｷBeCuR07-EHT 870 - 1000 4) 750 - 930 min. 4 250 - 310 min. 30
  1. Values are applicable to thickness 0.1 mm and over.
  2. Values are applicable to thickness 0.1 mm and over.
  3. Electrical conductivity is for design guidance only.
  4. The upper limits of tensile strength are for design guidance only.
  5. P and R in column "Designation" represent "strip cut to length" and "strip in coils".

Tolerances

Thickness tolerance of Alloy 7(mm)

  • *Standard thickness is only available for Alloy 7
Specified thicknessTolerance
0.08 ±0.006
0.10 ±0.006
0.12 ±0.006
0.15 ±0.008
0.18 ±0.010
0.20 ±0.010
0.25 ±0.010
0.30 ±0.015
0.35 ±0.015
0.40 ±0.015

Length tolerance(mm)

X axis:Speciied length; Y axis: Speciied thickness;Tolerance
FromUp to and includingmax. 1000
0.08 0.4 +10
-0

Width tolerance(mm)

X axis:Speciied width; Y axis: Speciied thickness;Tolerance
Strip cut to lengthStrip in coils
FromUp to and includingmax. 200max. 100Over 100 up to and including 200
0.08 0.40 +2
-0		 ±0.1 ±0.2
  • *note) When the tolerance is specified either plus or minus side only, the same range of tolerance shall be applied.

Camber tolerance(mm)

Specified WidthMaximum value
OverUp to and includingOver 1000 length
From 4 13 4
13 50 3
50 100 2
100 200 1
Camber tolerance(mm)

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