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Properties of phosphor bronze

Phosphor Bronze Plates and Strips

*Please contact us if you have any specific requests regarding chemical compositions, mechanical properties, and thicknesses.

Physical Properties

Alloy Number (unit) C5050 HRD200 C5111 C5102 C5191 C5212
Specific Gravity － 8.89 8.87 8.86 8.86 8.82 8.80
Coefficient of Thermal Expansion 10-6 /K 17.8 16.5 17.8 17.8 18.2 18.2
Thermal Conductivity W/m・K 205 152 84 71 67 63
Electrical Conductivity %IACS 38 32 20 15 14 12
Specific Heat J/Kg・K 377 377 377 377 375 377
Modulus of Elasticity (Tension) kN/m㎡ 118 122 110 110 115 110

Chemical Composition

Alloy No. Chemical Composition（%）
Sn P Fe Pb Zn Cu+Sn+P
C5050 1.0～1.7 ≦ 0.15 ≦ 0.10 ≦ 0.02 ≦ 0.20 ≧ 99.5
HRD200 1.7～2.3 ≦ 0.15
C5111 3.5～4.5 0.03～0.35
C5102 4.5～5.5
C5191 5.5～7.0
C5212 7.0～9.0

Mechanical Properties

Alloy No. Temper Tension Test Hardness Test
Thickness Category
㎜		 Tensile Strength
N/m㎡		 Elongation
%		 Thickness Category
㎜		 Vickers Hardness
HV*1
C5050 O ≧ 0.10 ,≦ 5.0 ≧ 240 ≧ 40 － －
1/4H ≧ 0.10 ,≦ 5.0 240～330 ≧ 30 ≧ 0.15 ,≦ 5.0 60～120
1/2H ≧ 0.10 ,≦ 5.0 330～450 ≧ 10 ≧ 0.10 ,≦ 5.0 90～155
H ≧ 0.10 ,≦ 5.0 390～500 ≧ 3 ≧ 0.10 ,≦ 5.0 120～165
EH ≧ 0.10 ,≦ 5.0 ≧ 460 － ≧ 0.05 ,≦ 5.0 ≧ 140
HRD200 O ≧ 0.10 ,≦ 5.0 ≧ 300 ≧ 30 ≧ 0.10 ,≦ 5.0 70～115
1/2H ≧ 0.10 ,≦ 5.0 400～500 ≧ 10 ≧ 0.10 ,≦ 5.0 125～165
H ≧ 0.10 ,≦ 5.0 450～550 ≧ 5 ≧ 0.10 ,≦ 5.0 150～185
EH ≧ 0.10 ,≦ 5.0 500～600 ≧ 2 ≧ 0.10 ,≦ 5.0 175～205
SH ≧ 0.10 ,≦ 5.0 600～700 － ≧ 0.10 ,≦ 5.0 185～215
C5111 O ≧ 0.10 ,≦ 5.0 ≧ 295 ≧ 38 － －
1/4H ≧ 0.10 ,≦ 5.0 345～440 ≧ 25 ≧ 0.15 ,≦ 5.0 80～150
1/2H ≧ 0.10 ,≦ 5.0 410～510 ≧ 12 ≧ 0.10 ,≦ 5.0 120～180
H ≧ 0.10 ,≦ 5.0 490～590 ≧ 7 ≧ 0.10 ,≦ 5.0 150～200
EH ≧ 0.10 ,＜ 0.20 570～660 － ≧ 0.05 ,≦ 5.0 170～220
≧ 0.20 ,≦ 5.0 ≧ 3
SH ≧ 0.10 ,≦ 5.0 ≧ 640 － ≧ 0.05 ,≦ 5.0 ≧ 200
C5102 O ≧ 0.10 ,≦ 5.0 ≧ 305 ≧ 40 － －
1/4H ≧ 0.10 ,≦ 5.0 375～470 ≧ 28 ≧ 0.10 ,≦ 5.0 90～160
1/2H ≧ 0.10 ,≦ 5.0 470～570 ≧ 15 ≧ 0.10 ,≦ 5.0 130～190
H ≧ 0.10 ,≦ 5.0 570～665 ≧ 7 ≧ 0.10 ,≦ 5.0 170～220
EH ≧ 0.10 ,＜ 0.20 620～710 － ≧ 0.05 ,≦ 5.0 190～230
≧ 0.20 ,≦ 5.0 ≧ 4
SH ≧ 0.10 ,≦ 5.0 ≧ 660 － ≧ 0.05 ,≦ 5.0 ≧ 200
C5191 O ≧ 0.10 ,≦ 5.0 ≧ 315 ≧ 42 － －
1/4H ≧ 0.10 ,≦ 5.0 390～510 ≧ 35 ≧ 0.10 ,≦ 5.0 100～160
1/2H ≧ 0.10 ,≦ 5.0 490～610 ≧ 20 ≧ 0.10 ,≦ 5.0 150～205
H ≧ 0.10 ,≦ 5.0 590～685 ≧ 8 ≧ 0.10 ,≦ 5.0 180～230
EH ≧ 0.10 ,＜ 0.20 635～720 － ≧ 0.05 ,≦ 5.0 200～240
≧ 0.20 ,≦ 5.0 ≧ 5
SH ≧ 0.10 ,≦ 5.0 ≧ 690 － ≧ 0.05 ,≦ 5.0 ≧ 210
C5212 O ≧ 0.10 ,≦ 5.0 ≧ 345 ≧ 45 － －
1/4H ≧ 0.10 ,≦ 5.0 390～510 ≧ 40 ≧ 0.10 ,≦ 5.0 100～160
1/2H ≧ 0.10 ,≦ 5.0 490～610 ≧ 30 ≧ 0.10 ,≦ 5.0 150～205
H ≧ 0.10 ,≦ 5.0 590～705 ≧ 12 ≧ 0.10 ,≦ 5.0 180～235
EH ≧ 0.10 ,＜ 0.20 ≧ 685 － ≧ 0.05 ,≦ 5.0 ≧ 210
≧ 0.20 ,≦ 5.0 ≧ 5
Note: The above standards are partially quoted from JIS H3110.
*1 Minimum test force is 1.961N

Thickness Tolerances

C5050・HRD200・C5111・C5102・C5191・C5212（Phosphor Bronze）
Unit：mm
Thickness Our Achievements Tolerance (width)
≦ 400
≧ 0.05 ≦ 0.08 ±0.002 ±0.005
＞ 0.08 ≦ 0.15 ±0.005 ±0.008
＞ 0.15 ≦ 0.25 ±0.007 ±0.013
＞ 0.25 ≦ 0.4 ±0.010 ±0.018
＞ 0.4 ≦ 0.55 ±0.012 ±0.020
＞ 0.55 ≦ 0.7 ±0.015 ±0.025
＞ 0.7 ≦ 0.9 ±0.020 ±0.030
＞ 0.9 ≦ 1.2 ±0.025 ±0.035
Note: The above standards are partially quoted from JIS H3110. Double the above values when changing the tolerance from (±) to only (+) or (-)

Phosphor Bronze Plates and Strips for Springs

*Please contact us if you have any specific requests regarding chemical composition, mechanical properties, and thicknesses.

Physical Properties

Alloy Number (unit) C5210 C5240
Specific Gravity － 8.80 8.78
Coefficient of Thermal Expansion 10-6 /K 18.2 18.4
Thermal Conductivity W/m・K 63 50
Electrical Conductivity %IACS 12 10
Specific Heat J/Kg・K 377 375
Modulus of Elasticity（Tension） kN/m㎡ 110 105

Chemical Composition

Alloy No. Chemical Composition（%）
Sn P Fe Pb Zn Cu+Sn+P
C5210 7.0～9.0 0.03～0.35 ≦ 0.10 ≦ 0.02 ≦ 0.20 ≧ 99.5
C5240 9.0～11.00 0.03～0.35 ≦ 0.10 ≦ 0.02 ≦ 0.20 ≧ 99.5

Mechanical Properties

Alloy No. Temper Tension Test Elastic Limit Test of Spring Hardness Test
Thickness Category
mm		 Tensile Strength
N/m㎡		 0.2% Yield Strength
N/m㎡		 Elongation
%		 Thickness Category
mm		 Elastic Limit of Spring
(Kb0.1)
N/m㎡		 Thickness Category
mm		 Vickers Hardness
HV*1
C5210 1/2H ≧ 0.10
≦ 1.6		 470～610 ≧ 260 ≧ 27 ≧ 0.15
≦ 1.6		 ≧ 245 ≧ 0.10
≦ 1.6		 140～205
H ≧ 0.10
≦ 1.6		 590～705 ≧ 450 ≧ 20 ≧ 0.15
≦ 1.6		 ≧ 390 ≧ 0.10
≦ 1.6		 185～235
EH ≧ 0.10
≦ 1.2		 685～785 ≧ 580 ≧ 11 ≧ 0.15
≦ 1.6		 ≧ 460 ≧ 0.10
≦ 1.2		 210～260
SH ≧ 0.10
≦ 1.2		 735～835 ≧ 640 ≧ 9 ≧ 0.15
≦ 1.6		 ≧ 510 ≧ 0.10
≦ 1.2		 230～270
ESH ≧ 0.10
≦ 0.40		 770～885 ≧ 690 ≧ 5 ≧ 0.15
≦ 1.6		 ≧ 560 ≧ 0.10
≦ 0.4		 245～285
C5240 H ≧ 0.10
≦ 1.6		 650～750 ≧ 510 ≧ 11 ≧ 0.15
≦ 1.6		 ≧ 430 ≧ 0.10
≦ 1.6		 200～240
EH ≧ 0.10
≦ 0.80		 750～850 ≧ 630 ≧ 9 ≧ 0.15
≦ 1.6		 ≧ 510 ≧ 0.10
≦ 0.8		 230～270
SH ≧ 0.10
≦ 0.40		 850～950 ≧ 750 ≧ 5 ≧ 0.15
≦ 1.6		 ≧ 570 ≧ 0.10
≦ 0.40		 250～300
ESH ≧ 0.10
≦ 0.40		 ≧ 950 ≧ 870 － ≧ 0.15
≦ 1.6		 ≧ 630 ≧ 0.10
≦ 0.40		 ≧ 270
XSH ≧ 0.10
≦ 0.40		 ≧ 1000 ≧ 930 － ≧ 0.15
≦ 1.6		 ≧ 700 ≧ 0.10
≦ 0.40		 ≧ 290
Note: The above standards are partially quoted from JIS H3130.
*1 Minimum test force is 1.961N

Thickness Tolerances

C5210・C5240
Unit：mm
Thickness Our Achievements Tolerance (width)
≦ 400
≧ 0.05 ≦ 0.08 ±0.002 ±0.005
＞ 0.08 ≦ 0.15 ±0.005 ±0.008
＞ 0.15 ≦ 0.25 ±0.007 ±0.013
＞ 0.25 ≦ 0.4 ±0.010 ±0.018
＞ 0.4 ≦ 0.55 ±0.012 ±0.020
＞ 0.55 ≦ 0.7 ±0.015 ±0.025
＞ 0.7 ≦ 0.9 ±0.020 ±0.030
＞ 0.9 ≦ 1.2 ±0.025 ±0.035

HQ Phosphor Bronze with High Strength and Bending Workability

As electronic devices and parts become smaller and thinner, the need for high strength and precision in the phosphor bronze as the base material also increases.

To meet these needs, we have established a production system for High Quality phosphor bronze with high bending workability (HQ series) in addition to our existing lineup.


Physical Properties

The HQ series is a phosphor bronze with improved mechanical properties through controlling the machining process. It has the same alloy composition as regular phosphor bronze and its physical properties are maintained.
Alloy Number (unit) C5191 C5210 C5240
Specific Gravity － 8.82 8.80 8.78
Linear Expansion Coefficient 10-6 /K 18.2 18.2 18.4
Thermal Conductivity W/m・K 67 63 50
Electrical Conductivity %IACS 14 12 10
Specific Heat J/Kg・K 375 377 375
Modulus of Elasticity（Tension） kN/m㎡ 115 110 105

Chemical Composition

【Harada's Management Standard】The chemical composition of the HQ series is the same as conventional phosphor bronze. We make use of its advantages as a specialized manufacturer of phosphor bronze to manage impurities even more strictly.
Specifications Sn P Pb Zn Fe Cu+Sn+P
C5191 5.5～7.0 0.03～0.20 0.01max 0.01max 0.01max 99.8min
C5210 7.0～9.0 0.03～0.20 0.01max 0.01max 0.01max 99.8min
C5240 9.0～11.0 0.04～0.20 0.01max 0.01max 0.01max 99.8min
Standard ― 0.03～0.35 0.02max 0.20max 0.10max 99.5min

Product Size

HQ phosphor bronze is developed with the below tempers and thicknesses. Please contact us for inquiries about other sizes.
Type Thickness Temper
H EH SH ESH XSH
C5191HQ 0.05～0.30mm ○ ○ ○ ― ―
C5210HQ ○ ○ ○ ○ ○
C5240HQ ○ ○ ○ ○ ○

Mechanical Properties

The below are typical examples of HQ and Harada’s average.
Alloy No. Temper Symbol Tensile Strength　N/m㎡ 0.2% Yield Strength　N/m㎡ Elongation　% Hardness HV Elastic Limit of Spring　N/m㎡
C5191 H Standard 590～685 － 8min 180～230 －
HQ 630 614 22.6 203 －
Harada’s average 620 600 17.6 202 －
EH Standard 635～720 － 5min 200～240 －
HQ 699 697 13.7 214 －
Harada’s average 690 662 11.0 213 －
SH Standard 690min － － 210min －
HQ 744 739 12.7 222 －
Harada’s average 725 710 8.3 216 －
C5210 H Standard 590～705 450min 20min 185～235 390min
HQ 616 569 35.3 197 469
Harada’s average 615 549 28.6 193 462
EH Standard 685～785 580min 11min 210～260 460min
HQ 721 694 23.2 229 563
Harada’s average 724 684 17.0 228 554
SH Standard 735～835 640min 9min 230～270 510min
HQ 778 773 13.3 242 632
Harada’s average 771 756 11.4 240 627
ESH Standard 770～885 690min 5min 245～285 560min
HQ 845 834 9.3 258 648
Harada’s average － － － － －

XSH

*

 Standard 835～1000 － 1min － 630min
HQ 979 968 2.1 285 706
Harada’s average － － － － －
C5240 H Standard 650～750 510min 11min 200～240 430min
HQ 693 657 25.6 223 558
EH Standard 750～850 630min 9min 230～270 510min
HQ 800 783 15.3 245 585
SH Standard 850～950 750min 5min 250～300 570min
HQ 890 877 9.2 267 661
ESH Standard 950min 870min － 270min 630min
HQ 1000 988 2.4 285 718
XSH Standard 1000min 930min － 290min 700min
HQ 1058 1044 2.0 305 883
Note: The above standards are partially quoted from JIS H3130. Applicable thicknesses are ≥0.05mm and ≤0.3mm.
*Internal standards are shown because the products are not standardized by JIS H3130(2018)

Thickness Tolerances

C5240
Unit：mm
Thickness Our Achievements Standard
≧ 0.05㎜ ,≦ 0.08㎜ ±0.002㎜ ±0.005㎜
＞ 0.08㎜ ,≦ 0.15㎜ ±0.005㎜ ±0.008㎜
＞ 0.15㎜ ,≦ 0.25㎜ ±0.007㎜ ±0.013㎜
＞ 0.25㎜ ,≦ 0.30㎜ ±0.008㎜ ±0.018㎜
Note: The above standards are partially quoted from JIS H3130.

Super-High Strength Phosphor Bronze HC5270

In order to meet the high expectations for higher strength phosphor bronze than ever before, we have carried out research and development of product characteristics and developed the ultra high strength phosphor bronze “HC5270” with a higher tin content of 12%.

We will continue to work to earn the trust of our valued customers by supplying the products required.

Physical Properties

Alloy Number (unit) HC5270
Specific Gravity － 8.75
Coefficient of Thermal Expansion 10-6 /K 18.4
Thermal Conductivity W/m・K 41
Electrical Conductivity %IACS 8.5
Specific Heat J/Kg・K 368
Modulus of Elasticity（Tension） kN/m㎡ 103
Poisson's ratio ー 0.33

Chemical Composition

【Harada's Management Standard】We make use of its advantages as a specialized manufacturer of phosphor bronze to manage impurities even more strictly.
Chemical Composition（%）
Sn P Pb Zn Fe Cu+Sn+P
11.0～13.0 0.03～0.20 0.01max 0.01max 0.01max 99.8min

Product Size

The table below shows the tempers and thicknesses we offer. Please contact us for inquiries about other sizes.
Thickness Temper
H EH SH ESH XSH
0.05～0.20mm ○ ○ － － －
0.05～0.15mm － － ○ ○ ○

Mechanical Properties

HC5270 as a typical example
Temper Symbol Tensile Strength N/m㎡ 0.2% Yield Strength N/m㎡ Elongation % Hardness HV
H Standard 750～850 620min 9min 230～270
HC5270 812 765 15.5 255
EH Standard 850～950 740min 5min 250～290
HC5270 895 842 8.7 267
SH Standard 950～1050 860min 1min 270～310
HC5270 1001 949 2.3 291
ESH Standard 1050min 980min ー 285min
HC5270 1109 1075 1.5 307
XSH Standard 1140min 1060min ー 310min
HC5270 1213 1167 1.5 354

Thickness Tolerances

Unit:mm
Thickness Our Achievements Standard
≧ 0.05 ,≦ 0.08 ±0.002 ±0.005
＞ 0.08 ,≦ 0.15 ±0.005 ±0.008
＞ 0.15 ,≦ 0.20 ±0.007 ±0.013