Harada JIS C5240HQ Phosphor Bronze – High Strength, Bendable, Hot‑Dip Tin Plated

Due to the global trend toward smaller and thinner electronic components, demand for phosphor bronze with higher strength and bendability has been increasing as the base material. To meet such needs, Harada has added a newly developed material to its products line-up, a high quality phosphor bronze (HQ).

This grade can be hot-dip tin plated.

Properties

General

Property	Value
Relative density	8.78 [-]

Mechanical

Property	Value	Comment
Bendability 90°, bw	0 [-]	H Temper
	1.5 [-]	EH Temper
	2 [-]	SH Temper
	3.3 [-]	ESH Temper
Bendability 90°, gw	0 [-]	H Temper
	0 [-]	EH Temper
	0.8 [-]	SH Temper
	1.6 [-]	ESH Temper
	2.5 [-]	XSH Temper
Elastic modulus	105 GPa
Elongation	2 %	XSH Temper
	2.4 %	ESH Temper
	9.2 %	SH Temper
	15.3 %	EH Temper
	25.6 %	H Temper
Flexural modulus	100 GPa
Hardness, Vickers	223 [-]	H Temper
	245 [-]	EH Temper
	267 [-]	SH Temper
	285 [-]	ESH Temper
	305 [-]	XSH Temper
Tensile strength	693 MPa	H Temper
	800 MPa	EH Temper
	890 MPa	SH Temper
	1000 MPa	ESH Temper
	1058 MPa	XSH Temper
Yield strength	558 MPa	H Temper \| for spring material (Kb0.1)
	585 MPa	EH Temper \| for spring material (Kb0.1)
	657 MPa	H Temper, RP02
	661 MPa	SH Temper \| for spring material (Kb0.1)
	718 MPa	ESH Temper \| for spring material (Kb0.1)
	783 MPa	EH Temper, RP02
	877 MPa	SH Temper, RP02
	883 MPa	XSH Temper \| for spring material (Kb0.1)
	988 MPa	ESH Temper, RP02
	1044 MPa	XSH Temper, RP02

Thermal

Property	Value
Coefficient of thermal expansion	1.84e-05 1/K
Melting point	845 - 1000 °C
Specific heat capacity	375 J/(kg·K)
Thermal conductivity	50 W/(m·K)

Electrical

Property	Value
Specific Electrical conductivity	10 % IACS

Chemical properties

Property	Value	Comment
Iron	0.01 %	max.
Lead	0.01 %	max.
Other	99.8 %	min. \| Cu+Sn+P
Phosphorus	0.04 - 0.2 %
Tin	9 - 11 %
Zinc	0.01 %	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

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

Tolerances

Thickness	Internal Controlled Specification	JIS Standard (H3110,H3130)
0.05∼0.08mm	±0.002	±0.005
0.09∼0.15mm	±0.002	±0.008
0.16∼0.25mm	±0.003	±0.013
0.26∼0.30mm	±0.004	±0.018

High-Quality Phosphor Bronze HQ – JIS C5210HQ Harada VDM Alloy 31 Plus® – Advanced Nickel‑Iron‑Chromium‑Molybdenum Alloy with Superior Corrosion Resistance

Metal