HRD125 Harada Low‑Tin Phosphor Bronze – Exceptional Conductivity & Workability

Phosphor bronze is a ternary alloy produced by adding tin to copper and deoxidizing with phosphorus. It has good workability, fatigue-endurance and corrosion-resistance. While phosphur bronze with higher tin content shows high strength and excellent elasticity, phosphor bronze with lower tin content has high electrical and thermal conductivity. Harada's low tin phosphor bronze "HRD125" demonstrates high electrical conductivity, and its outstanding workability for bending under appropriate conditions is suited for manufacturing in various shapes.

This grade can be hot-dip tin plated.

Properties

General

Property	Value
Relative density	8.89 [-]

Mechanical

Property	Value	Comment
Bendability 90°, bw	0 [-]	O Temper \| Ts=280 N/mm2
	0 [-]	1/4H Temper \| Ts=298 N/mm2
	1 [-]	1/2H Temper \| Ts=354 N/mm2
	1.5 [-]	H Temper \| Ts=409 N/mm2
	2 [-]	EH Temper \| Ts=484 N/mm2
Bendability 90°, gw	0 [-]	O Temper \| Ts=280 N/mm2
	0 [-]	1/4H Temper \| Ts=298 N/mm2
	0 [-]	1/2H Temper \| Ts=354 N/mm2
	0 [-]	H Temper \| Ts=409 N/mm2
	1.3 [-]	EH Temper \| Ts=484 N/mm2
Elastic modulus	110 GPa
Elongation	3 %	min. \| H Temper \| for thickness 0.1-5 mm
	10 %	min. \| 1/2H Temper \| for thickness 0.1-5 mm
	30 %	min. \| 1/4H Temper \| for thickness 0.1-5 mm
	40 %	min. \| O Temper \| for thickness 0.1-5 mm
Flexural modulus	100 GPa
Hardness, Vickers	60 - 120 [-]	1/4H Temper \| for thickness 0.15-5 mm
	90 - 155 [-]	1/2H Temper \| for thickness 0.1-5 mm
	120 - 165 [-]	H Temper \| for thickness 0.1-5 mm
	140 [-]	min. \| EH Temper \| for thickness 0.05-5 mm
Tensile strength	240 MPa	min. \| O Temper \| for thickness 0.1-5 mm
	240 - 330 MPa	1/4H Temper \| for thickness 0.1-5 mm
	330 - 450 MPa	1/2H Temper \| for thickness 0.1-5 mm
	390 - 500 MPa	H Temper \| for thickness 0.1-5 mm
	460 MPa	min. \| EH Temper \| for thickness 0.1-5 mm

Thermal

Property	Value
Coefficient of thermal expansion	1.78e-05 1/K
Melting point	1075 °C
Thermal conductivity	205 W/(m·K)

Electrical

Property	Value
Specific Electrical conductivity	40 % IACS

Chemical properties

Property	Value	Comment
Iron	0.1 %	max.
Lead	0.02 %	max.
Other	99.5 %	min. \| Cu+Sn+P
Phosphorus	0.15 %	max.
Tin	1 - 1.7 %
Zinc	0.2 %	max.

Technological properties

Property

Application areas

The grade is particularly suitable for electronics (connectors, lead frames, lead terminals, transistor terminals, etc.), electrical (relay and switch contacts, rotary switch slides and contacts, fuse clips, etc.), automotive (bearing frames, hydraulic equipment caps, packing, bearings, clutch disks, electrical parts, etc.) and others (bellows, slides, blades, plate springs, corrosion-proof machinery equipment, diaphragms, etc.)

Coating

Standard product specification of a HOT-DIP-tinned strip.

Base material thickness (mm)	0.1~0.8
Plating thickness (μm)	0.7~8.0
Width (mm)	8.0~170
Coil unit weight (kg/mm)	1.0 / 2.0 / 4.0/ 8.0
Coil inside diameter (mm)	250φ / 300φ / 400φ / 500φ
Plating material	Pure tin
Plating base material	Phosphor bronze

*Width means the slit width after plating.

*Different plating thickness for each side is possible.

* We can accommodate our products to individual specifications other than the above standard specifications. Please feel free to call us.

Other

Hardness Vickers note: Minimum test force is 1.961 N

Please contact the supplier if you have any specific requests regarding chemical compostions, mechanical properties, and thickness.

Tolerances

Thickness (mm)		Tolerance (Width)
Thickness (mm)		≤ 400	> 400, and up to 650
> 0.05	≤ 0.08	± 0.005	-
> 0.08	≤ 0.15	± 0.008	-
> 0.15	≤ 0.25	± 0.013	-
> 0.25	≤ 0.4	± 0.018	-
> 0.4	≤ 0.55	± 0.020	± 0.045
> 0.55	≤ 0.7	± 0.025	± 0.05
> 0.7	≤ 0.9	± 0.030	± 0.06
> 0.9	≤ 1.2	± 0.035	± 0.07
> 1.2	≤ 1.5	± 0.045	± 0.08
> 1.5	≤ 2	± 0.05	± 0.09
> 2	≤ 3	± 0.06	± 0.10
> 3	≤ 5	± 0.08	± 0.12
> 5	≤ 7	± 0.10	-

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