High Performance Alloys. Characteristics. Stamped parts connectors Relay springs Semiconductor components. Density 8.8 g/cm³

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1 Alloy Designation High Performance Alloys EN CuNi3Si DIN CEN/TS UNS Chemical Composition percentage Cu Rest % Ni 3 % Si.65 % Mg.15 % This alloy is in accordance with RoHS 22/96/CE for electric & electronic equipments and 22/53/CE for automotive industry. We have developed a wide range of high performance alloys with excellent properties regarding conductivity, strength, corrosion behaviour, bend ability and relaxation properties. STO alloys are the first choice materials for high-end applications and products. Characteristics CuNi3Si 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 bend ability, 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 15 C are excellent. In combination with a tin coating even at temperatures around 15 C (3.h) the tin coating does not peel off. The electrical and thermal conductivity is good. Welding, soldering and brazing properties are good too. Main Applications Automotive Switches and Relays, Contacts, Connectors, Terminals Electrical Switches and Relays, Contacts, Connectors, Terminals, Components for the electrical industry, Stamped parts, Semiconductor Components, Preferred Applications Electrical industry Components Stamped parts connectors Relay springs Semiconductor components xx xx xx xx xx x = well suited xx = particularly well suited Physical Properties Typical values in annealed temper at 2 C Density 8.8 g/cm³ Thermal expansion coefficient 2.. C /K Specific heat capacity.399 J/(g K) Thermal conductivity 19 W/(m K) Electrical conductivity (1 MS/m = 1 m/(ω ²) 23 MS/m Electrical conductivity (IACS) 4 % Thermal coefficient of electrical resistance (.. C) /K Modulus of elasticity (1 GPa = 1 kn/²) cold formed 1 GPa Page 1

2 Mechanical Properties (EN 1652) Temper Tensile Strength Rm Yield Strength Minimum Rp.2 Elongation Minimum A 5 Hardness MPa MPa % HV R R R Other tempers on request *only for information ** additional effort in production Electrical Conductivity HV * E. Conductivity [MS/m] R62 R65 R69 Temper Electrical conductivity is strongly influenced by chemical composition. A high level of cold deformation and small grain size decrease the electrical conductivity moderately. Minimum conductivity level can be specified. Fabrication Properties* Cold Forming Properties Machinability (Rating 2) Electroplating Properties Hot Tinning Properties Soft Soldering, Brazing Resistance Welding Gas Shielded Arc Welding aser Welding Soft Annealing ess suitable Fair ess suitable C, 1.. 3h Corrosion Resistance* CuNi3Si has good corrosion resistance in natural atmosphere. It is insensitive to stress corrosion cracking. * For more details call our technical service Stress Relieving Annealing * For more details call our technical service C, 1.. 3h Bend Fatigue (at room temperature) The fatigue strength gives an indication about the resistance to variations in applied tension. It is measured under syetrical alternating load. The maximum bending load for 1 7 load cycles without crack is measured. Dependent on the temper class it is approximately 1/3 of the tensile strength R m. Page 2

3 Bending Properties :.5 rel. Bending Radius R/T Bending bending edge transvers to rolling direction bending edge in rolling direction Bending test according to EN ISO 7438 is done with 1 wide samples. Smaller samples in general as well as lower thickness allow a lower bending radius without cracks. If needed we supply bending optimized temper classes that far exceed standard quality. Please take care when comparing with ASTM E 29 results, there the bend definition direction is contradictory. Bending Definition 1 R62 R655 R69 Transverse = good way = bad way 1 Bending Properties* Temper Bending 9 Bending 1 9 Transverse Transvers Transvers 9 1 Transverse R/T R/T R/T R/T R62.5 R R * Measured at sample width 1 according to EN 1654 Possible bending radius = (R/T) x thickness Minimum Bending Radius Calculation To find out the minimum possible bending radius take the R/T value from the list. Example: R/T =.5 and thickness.3 Minimum radius = (R/T) x thickness =.5 x.3 =.15 Softening Resistance Vickers Hardness HV R62 at 4 C R62 at 45 C R65 at 5 C Time [s] After short time heat treatment Vickers Hardness is measured. The diagram shows typical values. Page 3

4 Relaxation Properties R C R75 15 C R75 2 C 1 R C R75 15 C R75 2 C 1 R C R75 15 C R75 2 C 1 R C R75 15 C R75 2 C 1 5% of Rp.2 5% of Rp.2 Transverse % of Rp.2 % of Rp.2 Transverse Stress relaxation is tested with cantilever bending test equipment. This method is taking short time relaxation into account. so that the values achieved are very realistic, while other test methods like tube test pretend better properties from the achieved values. Relaxation values give an indication about stress relieve of strip under tension for a certain time and temperature. As it is measured on plain strip. the behaviour of deformed parts may differ. nevertheless the ratio between the different tempers remains the same. Typical test sample thickness is.3.6. Page 4

5 Camber Customized Tolerances Evenness Rolling direction Our products are produced in accordance with relevant norms EN 1652 / EN Customer specific tolerances for,, Camber, Transverse Flatness, Evenness, Twist and Coil set can be defined. We will be happy to meet your demands. EN 1652 defines only camber. Tolerance [] EN [] KME Standard [] KME Precision [] Coil set Twist ±.18 ±.5 ± ±.22 ±.7 ±.5 Rolling direction angle ±.25 ±.15 ± ±. ±.15 ± ±.4 ±.17 ± ±.4 ±.2 ± ±.4 ±.22 ±.12 h h Transverse Flatness ±.5 ±.25 ± ±.6 ±. ± ±.7 ±.45 ± ±. ±.5 ± ±.12 ±.6 ±. h Evenness Tolerance [] [] Roughness Ra [µm] [] On request > 2. Tolerance Standard / Precision [] [] / / / / / / / / / / / / / / / / / / / / / / / / / Page 5

6 Formats Dimension* Coil Strip thickness (other thicknesses on request) Strip width Outside diameter (Standard) (Deep-Drawing Quality) per Traverse wound strip Drums: wood, plastic, metal, flangeless TECSTRIP _multicoil Inner diameter for thickness Inner diameter 4 for thickness Maximum weight Outer diameter maximum Sheet 6.35 ength Sheets in standard dimensions e.g. 1, x 2, on stock Sheet > 6.35 ength Sheets in standard dimensions e.g. 1, x 2, Plate ength Disc Diameter * Some combinations might not be possible Page 6

7 Surface coatings & Special Treatments * Dimension Hot-Dip tinned and STO 28M Tin-Silver STO 13 Thermic Sn Tin ayer µm Different thickness per side possible Electroplating Tin, Silver, Gold, Cu-Flash, Ni-Flash, Selective plating Other coatings on request Profiled strips STO Multigauge Other width on request Surface with extra low residual carbon content possible. Protection with oil or adhesive foil on request * Further details you find at Standards for copper and copper alloys EN 1652 EN 1654 Plate, sheet, strip and circles for general purposes Strip for springs and connectors EN 1758 Strip for lead frames EN Hot-dip tinned strip EN Copper plate, sheet and strip for electrical purposes EN Electrolytically tinned strip Page 7 CuNi3Si_11_218