Alloy Designation STOL 94 High Performance STOL Alloys EN CuNi2,5SiZn DIN CEN/TS 13388 UNS Chemical Composition percentage Cu # Rest % Ni 1... 4. % Si.8.. 1. % Zn max. 2. % Sn max. 1. % Ag max..5 % Mg max..2 % Fe max..1 % We have developed a wide range of high performance alloys with excellent properties regarding conductivity, s trength, corrosion behavi our, bendability and relaxation properties. STOL alloys are the first choice materials for high-end a pplications and products. Characteristics STOL 94 is a NiSi alloy that is available in cold worked and precipitation hardened tempers. It combines maximum strength with excellent bend ability, good electrical conductivity, excellent resistance against relaxation. No peeling at long-term up to 13 C. a nd higher. Pa rti al s ubstitute for copper-beryllium alloys. Pb max..5 % # Cu + sum of named elements min. 99.5 % This alloy is in accordance with RoHS 22/96/CE for electric & electronic equipments and 22/53/CE for automotive industry. Main Applications Automotive: Switches and Relays, Terminals, Contacts, Connectors Electrical: Switches and Relays, Terminals, Contacts, Connectors Preferred Applications Spring Contact Fuse Box Le a dframe Current carrying Capacity High temperatures 13 C xx xx xx xx x = well suited xx = particularly well suited Physical Properties Typi ca l va lues in a nnealed temper at 2 C Density 8.85 g/cm³ Thermal expansion coefficient 2.. 3 C 17 1-6 /K Specific heat capacity.399 J/(g K) Thermal conductivity 185 W/(m K) El e ctri cal conductivity (1 MS/m = 1 m/(ω ²) 25 MS/m Electrical conductivity (IACS) 43 % Thermal coefficient of electrical resistance (.. 1 C) 1-3 /K Modul us of elasticity ( 1 GPa = 1 kn/²) cold formed 132 GPa Page 1
Mechanical Properties Temper - US Temper - Code Tensile Strength Rm Yield Strength Minimum Rp.2 Elongation Minimum A 5 Hardness HV * MPa MPa % HV R36-1 / 8 Hard - H 36.. 43 25 14 1.. 13 R41-1 / 4 Hard - H1 41.. 47 36 9 125.. 155 R46-1 / 2 Hard - H2 46.. 52 41 7 135.. 165 R52-3 / 4 Hard - H3 52.. 58 46 5 145.. 175 R58 - Extra Hard - H6 58.. 65 52 4 17.. 2 R62-1 / 2 Hard - TM1 62.. 72 54 16 18.. 24 R66-1 / 2 Hard - TM2 66..75 59 1 2.. 25 R75 - Hard - TM4 75.. 83 68 8 21.. 26 R8 - SHM - TM5 > 8 75 5 > 21 *only for information Electrical Conductivity 38 36 34 32 3 28 26 24 22 2 E. Conductivity [MS/m] El ectri cal conductivity i s strongly i nfluenced 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 Hot Forming Properties at 75.. 95 C Machinability (Rating 2) Electroplating Properties Hot Ti nning Properties Soft Sol dering, Brazing Resistance Welding Ga s Shielded Arc Welding La s er Welding Soft Annealing Temper Excellent Less suitable Fair Less suitable 25.. 65 C, 1.. 3h Corrosion Resistance* Resistant to: CuNi2,5SiSn has a good resistance in in natural and industrial atmosphere. Practically resistant against stress corrosion cracking * For more details call our technical service Stress Relieving Annealing 15.. 2 C, 1.. 3h * For more details ca ll our technical service Page 2
Bending Properties :.5 rel. Bending Radius R/T 8 7 6 5 4 3 2 1 bending edge transvers to rolling direction bending edge in rolling direction 9 Bending Bending test according to EN ISO 7438 is done with 1 wide samples. Smaller samples in general as well as lower thickness allow a l ower bending ra dius without cracks. If needed we supply bending optimized temper classes that far exceed standard quality. Pl ease ta ke care when comparing with ASTM E 29 results, there the bend definition direction is contradictory. Bending Definition rel. Bending Radius R/T 8 7 6 5 4 3 2 R36 R41 R46 R52 R58 R62 R66 R75 R8 bending edge transvers to rolling direction bending edge in rolling direction 18 Bending Transverse = good way Parallel = bad way 18 Parallel 9 Parallel 9 Transverse 18 Transverse 1 Bending Properties* Temper R36 R41 R46 R52 R58 R62 R66 R75 R8 Bending 9 Bending 18 Parallel Transvers Transvers Parallel 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 Mi ni mum radius = (R/T) x thickness =.5 x.3 =.15 R/T R/T R/T R/T R36.5.5 R41.5,5.5 1 R46.5.5 1 1.5 3 R52.5 1 2 2.5 3.5 R58.5 1 2.5 3 5 R62.5 1 1.5 R66.5 1 1 1.5 2 R75.5 2 2 3 4 R8.5 2 3 4 5 * Measured at sample width 1 according to EN 1654 / Possible bending radius = (R/T) x thickness Page 3
Relaxation Properties Remaining Stress [%] Remaining Stress [%] Remaining Stress [%] Remaining Stress [%] 1 9 8 7 6 5 4 3 2 1 1 9 8 7 6 5 4 3 2 1 1 9 8 7 6 5 4 3 2 1 1 9 8 7 6 5 4 3 2 1 R75 125 C R75 15 C R75 2 C 1 1 1 1 Time [h] R75 125 C R75 15 C R75 2 C 1 1 1 1 Time [h] R75 125 C R75 15 C R75 2 C 1 1 1 1 Time [h] R75 125 C R75 15 C R75 2 C 1 1 1 1 Time [h] Initial Stress: 5% of Rp.2 Parallel Rolling Direction Initial Stress: 5% of Rp.2 Trans verse Rolling Direction Initial Stress: 8% of Rp.2 Parallel Rolling Direction Initial Stress: 8% of Rp.2 Trans verse Rolling Direction Stress relaxation is tested with ca nti lever 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 ti me a nd 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
Softening Resistance Vickers Hardness HV 24 22 2 18 16 14 12 1 8 R66 at 5 C After short time heat treatment Vickers Hardness is measured. The diagram shows typical values. 6 4 1 3 6 18 3 18 36 18 Time [s] 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 l oad cycl es without cra ck is measured. Dependent on the temper class it is approximately 1/3 of the tensile strength R m. Page 5
Camber Customized Tolerances Evenness L Rolling direction Our products are produced in accordance with relevant norms EN 1652 / EN 1654. 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 ca mber. Tolerance L [] EN 1652 35 [] KME Sta ndard [] KME Preci s ion [] Coil set Twist.1...2 ±.18 ±.5 ±.4.21...3 ±.22 ±.7 ±.5 L Rolling direction angle.31...4 ±.25 ±.15 ±.6.41...5 ±.3 ±.15 ±.8.51...6 ±.4 ±.17 ±.1.61...7 ±.4 ±.2 ±.1.71...85 ±.4 ±.22 ±.12 h h Transverse Flatness.86.. 1.3 ±.5 ±.25 ±.15 1.31.. 2. ±.6 ±.3 ±.2 2.1.. 3. ±.7 ±.45 ±.25 3... 4. ±.1 ±.5 ±.25 4... 6. ±.12 ±.6 ±.3 h L Evenness Tolerance Roughness Ra [µm] [] [] [] 7.. 2 21.. 5 51.. 1.1...5 +.1 +.2 +.3.5.. 1. +.15 +.25 +.35.13...18.1.. 2..2...3.1.. 2..35...46.1.. 2. On request > 2. Tolerance Standard / Precision [] [] 1.. 5 51.. 1 11.. 2 21.. 35 351.. 7 7.. 1,25*.1.. 1. +.2 / +.1 +.3 / +.2 +.4 / +.3 +.6 / +.4 +1. / +.5 -.2.. 1. +.2 / +.1 +.3 / +.2 +.4 / +.3 +.6 / +.4 +1. / +.5 +2. 1.1.. 2. +.3 / +.2 +.4 / +.2 +.5 / +.4 +1. / +.6 +1.5 / +.7 +2. 2.1.. 3. +.5 / +.3 +.6 / +.3 +.7 / +.5 +1.2 / +.7 +2. / +.9 +3. 3.1.. 6. +2. / - +2.3 / - +2.5 / - +3. / - +4. / - +6. Page 6
Formats Dimension* Coi l Strip thickness (other thicknesses on request).1.. 6. Strip width Outside diameter (Standard) (Deep-Drawing Quality) per 3.. 1.25 1.4 8.4 8. 12. Tra vers e wound s trip Drums: wood, plastic, metal, flangeless.2.. 1.5 8.. 6. 3.. 1.5 TECSTRIP _multicoil Inner diameter 3 for thickness Inner diameter 4 for thickness Maximum weight.18...8 15.. 5.15...8.41...8 5. Outer diameter maximum 1.6 Sheet.3.. 6.35 6.35 Length Sheets i n s tandard dimensions 5..1.25 2.. 6.5 2.8.. 8. e.g. 1, x 2, on stock Sheet 6.35.. 9.5 > 6.35 Length Sheets i n s tandard dimensions 5.. 2.45 2.. 7.5 1. e.g. 1, x 2, Plate 9.5.. 15 Length 4.5 15. 8. Disc.3.. 15 Diameter 2.. 3.1 1. * Some combinations might not be possible Page 7
Surface coatings & Special Treatments * Dimension Hot-Di p tinned a nd 33 STOL 28M Tin-Silver STOL 13 Thermic Sn Tin Layer 1.5.4.. 2 µm Different thickness per side possible Electroplating 4 2.5 Tin, Silver, Gold, Cu-Flash, Ni-Flash, Selective plating Other coa tings on request Profi l ed s trips STOL Multigauge 15.. 9.23.. 1 Other wi dth on request Surface with extra low resi dual carbon content possible. Protection with oil or a dhesive foil on request * Further details you find at www.kme.com Standards for copper and copper alloys EN 1652 Plate, sheet, strip and circles for general purposes EN 1654 Strip for s prings and connectors EN 1758 Strip for lead frames EN 13148 Hot-dip tinned s trip EN 13599 Copper plate, sheet and strip for electrical purposes EN 14436 Electrolytically ti nned strip Page 8 STOL(R)_94_23_5_218