Description

STOL® 76M is an optimized CuNiSi alloy that can be hardened by cold forming and by precipitation of NiSi-phases during a heat treatment. It has excellent bendability, excellent hot and cold forming properties, a high strength and a good corrosion resistance. Due to the NiSi-precipitations the relaxation properties, even at temperatures up to 150°C are excellent. In combination with a tin coating even at temperatures around 150°C (3.000h) the tin coating does not peel off.

Equivalent Materials

Properties

General

Density ρ

8.9 g/cm³ at 20 °C

Mechanical

Bendability 180°, bw r180,bw

0.5 [-] at 20 °C

r = x t, t <0.5mm

Bendability 180°, gw r180,gw

1 [-] at 20 °C

r = x t, t <0.5mm

Bendability 90°, bw r90,bw

0 [-] at 20 °C

r = x t, t <0.5mm

Bendability 90°, gw r90,gw

0 [-] at 20 °C

r = x t, t <0.5mm

Elastic modulus E

118 - 135 GPa at 20 °C

depending on the condition

Elongation A50 A50

9 - 11 % at 20 °C

Hardness, Vickers HV

125 - 155 [-] at 20 °C

Tensile strength Rm

410 - 470 MPa at 20 °C

Yield strength Rp0.2 Rp0.2

360 MPa at 20 °C

Thermal

Coefficient of thermal expansion α

1.68E-5 1/K at 300 °C

for 20°C to the mentioned temperature

Specific heat capacity cp

377 J/(kg·K) at 20 °C

Thermal conductivity λ

260 W/(m·K) at 20 °C

Electrical

Specific Electrical conductivity

57 % IACS

Chemical properties

Element

Weight %

Comment

Cu

-

Balance

Ni

1.4 - 1.7 %

Zn

0.35 - 0.5 %

Si

0.2 - 0.35 %

Sn

0.02 - 0.3 %

More

Technological properties

Application areas

Automotive: Switches and Relays, Contacts, Connectors, Terminals, Press fits. Electrical: Switches and Relays, Contacts, Connectors, Terminals, Press fits, Components for the electrical industry, Stamped parts, Semiconductor Components.

Brazing

Excellent

Cold Forming

Excellent

Corrosion properties

STOL® 76M has good corrosion resistance, The alloy is insensitive to stress corrosion cracking

Heat Treatment

Soft Annealing 250-650°C, 1-3h - Stress Relieving Annealing 150-200°C, 1-3h

Hot forming

at 750-950°C, excellent

Machining

Rating 20, less suitable

Other

This alloy is in accordance with RoHS 2002/96/CE for electric & electronic equipments and 2002/53/CE for automotive industry.

Plating

Electroplating is excellent

Processing history

Temper: R410

Welding

Gas Shielded Arc Welding: Excellent, Laser Welding: Fair

This material data has been provided by KME Germany.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.