CuZn20 C24000 Industrial Rolled

Transcription

1 Alloy Designation Brass Rolled Products EN DIN CEN/TS JIS C 2400 BS UNS KME offers a wide range of brass rolled products in the form of strips, sheets and discs in order to meet our customer s needs for industrial manufacturing or for the production of gift articles and decorative objects. Chemical Composition Weight percentage Cu % Zn Rest % Ni 0.5 % Sn 0.5 % Fe 0.05 % This alloy is in accordance with RoHS 2002/96/CE for electric & electronic equipments and 2002/53/CE for automotive industry Characteristics has excellent cold forming, good hot forming properties and is well suited for e.g. coinage, beating, embossing. This alloy has a higher strength than pure copper. has good welding and brazing properties as well as a good corrosion resistance and is not fragile to stress corrosion and dezincification. It is principally used in jewellery, metal goods, watch industry and in electronic industry for installation parts. We produce qualities with grain sizes below 5 µm if needed. The alloy type is listed in the USA by EPA to have good antimicrobial properties. Main Applications Architecture: Spandrels, Medallions, Ornamental Components Builders Hardware: Decorative Panels Consumer: Clock Dials, Plaques, Musical Instrument Parts Electrical: Battery Caps, Rotor Bars, AC Motors Industrial: Pump Lines, Welding Wire, Flexible Hose, Flexible Hose Bellows Other: Token. Jewellery and metal goods, Deep drawn parts Typical Application: Jewellery and metal goods, Deep drawn parts Preferred Applications Jewellery and Metal Goods Deep Drawn Parts Components for the Electrical Industry Stamped Parts Connectors xx xx x = well suited xx = particularly well suited Physical Properties Typical values in annealed temper at 20 C Density 8.67 g/cm³ Thermal expansion coefficient C C /K 10-6 /K Specific heat capacity J/(g K) Thermal conductivity 142 W/(m K) Electrical conductivity (1 MS/m = 1 m/(ω ²) 19 MS/m Electrical conductivity (IACS) 32.8 % Thermal coefficient of electrical resistance ( C) /K Modulus of elasticity ( 1 GPa = 1 kn/²) cold formed annealed GPa GPa Page 1

2 Page 2 Mechanical Properties (EN 1652) Temper Tensile Strength Rm Yield Strength Rp 0.2 * Elongation Minimum A 50 Hardness HV * MPa MPa % HV R270 annealed R R R * only for information Electrical Conductivity Electrical Conductivity [MS/m] 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. 16 R270 R320 R400 R480 Temper Fabrication Properties* Cold Forming Properties Max. 90% between annealings Hot Forming Properties at C Machinability (Rating 30) Electroplating Properties Hot Tinning Properties Soft Soldering, Brazing Resistance Welding Gas Shielded Arc Welding Laser Welding Excellent Good Less suitable Excellent Excellent Excellent Good Fair Fair Soft Annealing C Corrosion Resistance* Resistant to: has in general a good resistance to natural-, sea- and industrial atmosphere, water, water vapour, different saline solutions, many organic liquids, neutraland alkaline bonds. CuSn20 has a very low sensitivity to stress corrosion cracking. To avoid stress corrosion as much as possible, the alloy should be used in a stress relieved temper. CuSn20 is not sensitive to dezincification, that could occur in water with high chlorine content and low carbonate-hardness. Not resistant to: Oxidizing acids, hydrous sulphur components. * For more details call our technical service Stress Relieving Annealing C * For more details call our technical service

3 Page 3 Bending Properties : 0.5 relative Bending Radius R/T bending edge transvers to rolling direction bending edge in rolling direction 90 Bending Bending test according to EN ISO 7438 is done with 10 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 290 results, there the bend definition direction is contradictory. Bending Definition 0 R270 R320 R400 R480 Transverse = good way Parallel = bad way relative Bending Radius R/T Temper bending edge transvers to rolling direction bending edge in rolling direction 180 Bending 180 Parallel 90 Parallel 90 Transverse 180 Transverse Minimum Bending Radius Calculation 0 R270 R320 R400 R480 Temper To find out the minimum possible bending radius take the R/T value from the list. Example: R/T = 0.5 and thickness 0.3 Minimum radius = (R/T) x thickness = 0.5 x 0.3 = 0.15 Bending Properties* Temper Thickne ss Range Bending 90 Bending 180 Parallel Transvers Transvers Parallel R/T R/T R/T R/T R R R R , * Measured at sample width 10 according to EN 1654 Possible bending radius = (R/T) x thickness

4 Sanitary and Antimicrobial Properties Marc Solioz, University of Bern Copper has been recognised as a hygienic material since the dawn of civilisation and, in the last two centuries, the anecdotal evidence has been supported by scientific research showing that copper is antimicrobial, i.e. it inhibits the growth of harmful pathogens - bacteria, moulds, algae, fungi and viruses. Due to its high copper content of about 80% provides the antimicrobial properties of copper to inhibit the growth of bacteria, viruses and fungi which are in contact for a short period of time on copper containing surfaces. Copper surfaces have sanitizing properties and self-sanitizing activity that make it attractive for hygienic and sanitary use e.g. in hospitals, nursing homes and other healthcare facilities or public buildings. The effect has been verified in recent scientific studies on a range of disease-causing organisms including MRSA, Clostridium difficile, E.coli, Listeria monocytogenes, Influenza A (H1N1) and Aspergillus niger. Picture: Copper coin (Irish penny) on an agar plate with cells of E. coli bacteria For more details please contact our technical service. Softening Resistance Vickers Hardness HV R480 at 400 C R480 at 500 C Time [s] After short time heat treatment Vickers Hardness is measured. The diagram shows typical values. 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 10 7 load cycles without crack is measured. Dependent on the temper class it is approximately 1/3 of the tensile strength R m. Page 4

5 Relaxation Properties Values from CuZn30 Thermal stress relieved will have lower remaining stress Remaining Stress [%] R C R C R C Initial Stress: 80% of Rp 0.2 Parallel Rolling Direction Time [h] 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 Page 5

6 Page 6 Brass Processing KME Alloy Machining Mechanical Polishing Electro Polishing 305 CuZn CuZn CuZn CuZn CuZn CuZn CuZn CuZn CuZn39Pb CuZn CuSn3Zn9 CuSn2Zn10 Brazing Gas Welding Gas Shielded Arc Welding Resistance Welding = excellent 2 = good 3 = fair 4 = less suitable Laser Welding Phase Diagram Copper Zink (after Struers Scientific Instruments)

7 Page 7 Camber Customized Tolerances Evenness h L 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 h L Range [] EN [] KME Standard [] KME Precision [] Coil set Twist ±0.018 ±0.005 ± ±0.022 ±0.007 ±0.005 L angle ±0.025 ±0.015 ± ±0.030 ±0.015 ± ±0.040 ±0.017 ± ±0.040 ±0.020 ± ±0.040 ±0.022 ±0.012 h h Transverse Flatness h L Evenness Tolerance Range [] Range [] ±0.050 ±0.025 ± ±0.060 ±0.030 ± ±0.070 ±0.045 ± ±0.100 ±0.050 ± ±0.120 ±0.060 ±0.030 Roughness Ra [µm] [] On request > 2.0 Tolerance Standard / Precision Range [] Range [] , / / / / / / / / / / / / / / / / / / / / / / / / /

8 Page 8 Formats Dimension* Coil Strip thickness (other thicknesses on request) Strip width Outside diameter Weight (Standard) Weight (Deep-Drawing Quality) Weight per ,000 1,400 8,400 8, Traverse wound strip Weight Drums: wood, plastic, metal, flangeless ,500 TECSTRIP _multicoil Inner diameter 300 for thickness Inner diameter 400 for thickness Maximum weight Outer diameter maximum ,000 1,600 Sheet 6.35 Length Weight Sheets in standard dimensions e.g. 1,000 x 2,000 on stock , ,500 2, ,000 Sheet > 6.35 Length Weight Sheets in standard dimensions e.g. 1,000 x 2, , ,500 10,000 Plate Length Weight ,000 15,000 8,000 Disc Diameter Weight ,000 10,000 * Some combinations might not be possible

9 Page 9 Surface coatings & Special Treatments * Dimension Hot-Dip tinned and STOL 28M Tin-Silver STOL 13 Thermic Sn Tin Layer µm Different thickness per side possible Electroplating Tin, Silver, Gold, Cu-Flash, Ni-Flash, Selective plating Other coatings on request Profiled strips STOL Multigauge Other width on request Bright and polished appearance GS1 Surface Quality Skin passed material 1, 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 EN 1758 EN EN EN Plate, sheet, strip and circles for general purposes Strip for springs and connectors Strip for lead frames Hot-dip tinned strip Copper plate, sheet and strip for electrical purposes Electrolytically tinned strip

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