Wieland-K75® Rolled Products CuCrSiTi C18070 Material Designation Chemical Composition (Reference) Typical Applications EN no EN standard Cr 0.3 % UNS* C18070 Ti 0.1 % Si 0.02 % Cu balance · Components for the electrical industry · Stamped parts ·Connectors · Relay springs · Semiconductor components * Unified Numbering System (USA) Physical Properties* Electrical Conductivity MS/m %IACS 45 78 Thermal Conductivity W/(m·K) 310 Coefficient of Electrical Resistance** 10-3/K 3.0 Coefficient of Thermal Expansion** 10-6/K 18.0 Density 8.88 g/cm3 Modulus of Elasticity GPa Specific Heat J/(g·K) Poisson’s Ratio 138 0.385 0.34 * Reference values at room temperature ** Between 0 and 300 °C Fabrication Properties Corrosion Resistance Capacity for Being Cold Worked good Machinability less suitable Capacity for Being Electroplated good Wieland-K75® is resistant to pure water vapour and non oxidizing acids and alkalis as well as neutral saline solutions. The material is insensitive to stress corrosion cracking. Capacity for Being Hot-Dip Tinned good Soft Soldering good Resistance Welding fair Gas Shielded Arc Welding excellent Laser Welding fair Mechanical Properties K75 R400 R460 54 R530 R550 Tensile Strength Rm MPa 400–480 460–540 52 530–610 550–630 Yield Strength Rp0.2 MPa ≥ 300 ≥ 370 50 ≥ 460 ≥ 520 Elongation A50mm % ≥8 ≥ 548 ≥2 ≥7 (140–170) 46 (150–190) (150–190) Hardness HV (for information only) (120–150) El. conductivity (MS/m) Temper 44 42 R400 R460 R530 R550 Temper 54 6 52 5 50 48 46 44 42 R400 R460 R530 Temper K75 6 90° Bendability (Strip Thickness t ≤ 0.5 K75 mm) K75 R550 Rel. bending radius r/t El. conductivity (MS/m) Electrical Conductivity 4 3 180° bending edge –I rolling direction bending edge II rolling direction 2 1 0 R400 R460 R530 Temper R550 Wieland-K75® CuCrSiTi C18070 K75 160 180 150 170 140 160 130 150 Vickers Hardness HV Vickers Hardness HV Resistance K75 to Softening 120 110 100 Temper R460 400 °C 450 °C 500 °C 90 80 70 0 5 10 15 20 Time (min) 25 30 Vickers hardness after heat treatment (typical values) 140 130 120 Temper R530 400 °C 450 °C 500 °C 110 100 90 0 5 10 15 20 Time (min) 25 30 K75 Thermal Stress Relaxation Stress remaining after thermal relaxation as a function of Larson-Miller parameter (F. R. Larson, J. Miller, Trans ASME74 (1952) 765–775) given by: P = (20 + log(t))*(T + 273)*0.001. Time t in hours, temperature T in °C. Example: P = 9 is equivalent to 1.000 h/118 °C. Measured on stress relief annealed specimens parallel to rolling direction. Total stress relaxation depends on the applied stress level. Furthermore, it is increased to some extent by cold deformation. 100 Residual Stress (%) 90 80 70 60 50 40 Temper R400, R460, R530, R550 7.0 8.0 9.0 10.0 Larson-Miller parameter P 11.0 Fatigue Strength The fatigue strength is defined as the maximum bending stress amplitude which a material withstands for 107 load cycles under symmetrical alternate load without breaking. It is dependent on the temper tested and is about 1/3 of the tensile strength Rm. · Standard coils with outside diameters up to 1400 mm · Traverse-wound coils with drum weights up to 1.5 t · Multicoil up to 5 t Wieland-Werke AG Dimensions Available · Hot-dip tinned strip · Contour-milled strip ·Sheet · Strip and sheet with protective coating www.wieland.com Graf-Arco-Str. 36, 89079 Ulm, Germany, Phone +49 731 944 2030, Fax +49 731 944 4257, [email protected] This printed matter is not subject to revision. No claims can be derived from it unless there is evidence of intent or gross negligence. The product characteristics are not guaranteed and do not replace our experts’ advice. · Strip thickness from 0.10 mm, thinner gauges on request · Strip width from 3 mm, however min. 10 x strip thickness 10/14 Bm (R+G) Types and Formats Available