tailieunhanh - Materials Selection Deskbook 2011 Part 7

Tham khảo tài liệu 'materials selection deskbook 2011 part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Table . Various Grades of Copper 28 Alloy Alloying Elements by wt Thermal Conductivity Btu ft2-hr F ft Ultimate Tensile Strength ton annealed hard worked Tough-Pitch High- Conductivity . 1036 oxygen 229 14 20 Tough-Pitch . 1038 9 oxygen 228 14 20 Tough-Pitch Arsenical . 1173 oxygen As 102 14 21-23 Deoxidized . 1172 p 126-175 14 20 Deoxidized Arsenical . 1171 p As 102 14 21-23 Oxygen-Free High-Conductivity Trace 229 14 20 Silver-bearing Ag oxygen 228 14 22 Chromium Copper Cr 100 15 29 Tellurium Copper Te 208 15 Beryllium Copper About 2 Be with other elements Co Ni Cr 50 33 75 78 Materials Selection Deskbook Properties and Selection of Materials 79 The approximate tensile strength is 14 ton at ordinary temperatures and its strength decreases with increasing temperature. Typical mechanical properties of copper as a function of temperature are given in Table . Copper retains high impact strength and increases its tensile strength under low temperatures including cryogenic applications. Typical data are given in Table . Along with high mechanical properties copper improves its conductivity in the range of lower temperatures at -160 C 400 -190 C 450 and -252 c 1600 kcal m C hr . It softens in the temperature range of 200 to 220 C as shown in Figure . The casting properties of copper are rather fair but copper can be readily stretched flattened rolled welded and brazed. For chemical plant work welded or brazed joints have become almost universal. Copper does not form protective oxide films. Therefore its corrosion resistance is poor against most acids and salts. Many gases-haloids sulfurous anhydride sulfur vapors hydrogen sulfide carbon dioxide ammoniumdestroy copper. However copper is highly corrosion resistant to alkali solutions. Brasses These are alloys containing more than 50 of copper used to overcome the softness low tensile strength and high casting

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