Machinery's Handbook, 31st Edition
Wrought CopperS AND COPPER Alloys Strength of Copper-Zinc-Tin Alloys (US Government Tests)
525
Percentage of
Percentage of
Percentage of
Tensile Strength
Tensile Strength
Tensile Strength
Copper Zinc Tin lb/in 2 MPa 45 50 5 15,000 103.4 60 20 20 10,000 68.9 75 20 5 45,000 310.3 50 45 5 50,000 344.7 65 30 5 50,000 344.7 75 15 10 45,000 310.3 50 40 10 15,000 103.4 65 25 10 42,000 289.6 75 10 15 43,000 296.5 55 43 2 65,000 488.2 65 20 15 30,000 206.8 75 5 20 41,000 282.7 MPa Copper Zinc Tin lb/in 2 MPa Copper Zinc Tin lb/in 2 55 40 5 62,000 427.5 65 15 20 18,000 124.1 80 15 5 45,000 310.3 55 35 10 32,500 224.0 65 10 25 12,000 82.7 80 10 10 45,000 310.3 55 30 15 15,000 103.4 70 25 5 45,000 310.3 80 5 15 47,500 327.5 60 37 3 60,000 413.7 70 20 10 44,000 303.4 85 10 5 43,500 299.9 60 35 5 52,500 362.0 70 15 15 37,000 255.1 85 5 10 46,500 320.6 60 30 10 40,000 275.8 70 10 20 30,000 206.8 90 5 5 42,000 289.6 Copper-Silicon and Copper-Beryllium Alloys Everdur.— This copper-silicon alloy is available in five slightly different nominal com positions for applications that require high strength, good fabricating and fusing quali- ties, immunity to rust, free-machining and a corrosion resistance equivalent to copper. The following table gives the nominal compositions and tensile strengths, yield strengths, and percent elongations for various tempers and forms. Table 4. Nominal Composition and Properties of Everdur
Strength
Nominal Composition
Tensile
Yield
Desig. No.
Elongation (%)
Temper a
Cu Si
Mn Pb Al
ksi
MPa
ksi 15 18 18 40 60 10 40 15 50
MPa
A 52 HRA 50 CRA 52 CRHH 71
359 345 359 490 600 262 345 359 586 310
103 124 124 276 414
35 b 40 35 10
655 95.80 3.10 1.10
CRH 87 3 H 70 − 85 483 − 586 38 − 50 262 − 345 17 to 8 b 276 7 XHB 75 − 85 517 − 586 45 − 55 310 − 379 8 to 6 b AP HP 38 50 69 35
651 98.25 1.50 0.25
A 52 H 85 AC 45
103 345
35 b
661 95.60 3.00 1.00 0.40
13 to 8 b
6552 94.90 4.00 1.10 637 90.75 2.00
15
7.25 A 75 − 90 517 − 621 37.5 − 45 259 − 310 12 to 9 b a Symbols used are HRA for hot-rolled and annealed tank plates; CRA for cold-rolled sheets and strips; CRHH for cold-rolled half hard strips; abd CRH for cold-rolled hard strips. For round, square, hexagonal, and octagonal rods: A for annealed; H for hard; and XHB for extra-hard bolt temper (in coils for cold-heading). For pipe and tube: AP for annealed; and HP for hard. For castings: AC for as cast. b Percent elongation in 4 times the diameter or thickness of the specimen. All other values are percent elongation in 2 inches. Designation numbers are those of the American Brass Co. The values given for tensile srength, yield strength, and elongation are all minimum values. Where ranges are shown, the first values given are for the largest diameter or largest size specimens. Yield strength values were determined at 0.50 percent elongation under load. Copper-Beryllium Alloys.— Alloys of copper and beryllium present health hazards. Particles produced by machining may be absorbed into the body through the skin, the mouth, the nose, or an open wound, resulting in a condition requiring immediate medi- cal attention. Working of these alloys requires protective clothing or other shielding in a monitored environment. Copper-beryllium alloys involved in a fire give off profuse toxic fumes that must not be inhaled.
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