Machinery's Handbook, 31st Edition
526 Copper-Beryllium Alloys These alloys contain copper, beryllium, cobalt, and silver, and fall into two groups. One group, whose beryllium content is greater than one percent, is characterized by its high strength and hardness, and the other, whose beryllium content is less than one percent, by its high electrical and thermal conductivity. The alloys have many applications in the electrical and aircraft industries or wherever strength, corrosion resistance, conductivity, non-magnetic and nonsparking properties are essential. Beryllium copper is obtainable in the form of strips, rods and bars, wire, platers, bars, billets, tubes, and casting ingots. Composition and Properties: Table 5 lists some of the more common wrought alloys and gives some of their mechanical properties. Table 5. Wrought Copper–Beryllium Properties
Yield Strength 0.2% Offset
Elongation % in 2 inch (5.08 cm)
Tensile Strength
Alloy a
Form Temper b
Heat Treatment
ksi
MPa
ksi
MPa
A
60–85 414–586 20–30 138–207 85–130 586–896 75–105 517–724
35–60 10–20
25
1 ⁄
2 H or H
Rod, Bar, and Plate
AT 3 hr at 600 ° F (316 ° C)
3–10
or mill heat treated 165–190 1138–1310 145–175 1000–1207 ° F (316 ° C) or mill heat treated 175–215 1207–1482 150–200 1034–1379
2–5
1 ⁄ 2 HT or HT 2 hr at 600
A
58–78 400–538 20–35 138–241 90–115 621–793 70–95 483–655 110–135 758–931 90–110 621–758 130–155 896–1069 110–135 758–931 165–190 1138–1310 145–175 1000–1207 175–205 1207–1413 160–190 1103–1310 190–215 1310–1482 175–200 1207–1379 195–220 1344–1517 180–205 1241–1413 115–165 793–1138 95–145 655–1000 60–85 414–586 20–30 138–207 85–130 586–896 75–105 517–724
35–55 10–35 5–10
1 ⁄ 1 ⁄ 3 ⁄
4 H 2 H 4 H
2–8 3–8 2–5 1–3 1–3 2–8
Wire
AT 3 hr at 600 ° F (316 ° C) 1 ⁄ 4 HT 2 hr at 600 ° F (316 ° C) 1 ⁄ 2 HT 2 hr at 600 ° F (316 ° C) 3 ⁄ 4 HT 2 hr at 600 ° F (316 ° C) XHT Mill heat treated
A
35–60 10–20
165
1 ⁄
2 H or H
Rod, Bar, and Plate
AT 3 hr at 650 ° F (343 ° C)
4–10
or mill heat treated 150–180 1034–1241 125–155 862–1069 ° F (343 ° C) or mill heat treated 165–200 1138–1379 135–165 931–1138
2–5
1 ⁄ 2 HT or HT 2 hr at 650
A
35–55 241–379 20–30 138–207 65–80 448–552 55–75 379–517
20–35 10–15 10–25
10
1 ⁄
2 H or H
Rod, Bar, and Plate
AT 3 hr at 900 ° F (482 ° C)
or mill heat treated 100–120 689–827 80–100 552–689 ° F (482 ° C) or mill heat treated 110–130 758–896 100–120 689–827
8–20
1 ⁄ 2 HT or HT 2 hr at 900
A
35–55 241–379 20–30 138–207 65–80 448–552 55–75 379–517
20–35 10–15 10–25
50
1 ⁄
2 H or H
Rod, Bar, and Plate
AT 3 hr at 900 ° F (482 ° C)
or mill heat treated 100–120 689–827 80–100 552–689 ° F (482 ° C) or mill heat treated 110–130 758–896 100–120 689–827
8–20
1 ⁄ 2 HT or HT 2 hr at 900
A
35–55 241–379 20–30 138–207 65–80 448–552 55–75 379–517
20–35 10–15 10–25
35
1 ⁄
2 H or H
Rod, Bar, and Plate
AT 3 hr at 900 ° F (482 ° C)
or mill heat treated 100–120 689–827 80–100 552–689 ° F (482 ° C) or mill heat treated 110–130 758–896 100–120 689–827
1 ⁄ 2 HT or HT 2 hr at 900 8–20 a Composition (in percent) of alloys is as follows: alloy 25: 1.80–2.05 Be, 0.20–0.35 Co, balance Cu; alloy 165: 1.6–1.8 Be, 0.20–0.35 Co, balance Cu; alloy 10: 0.4–0.7 Be, 2.35–2.70 Co, balance Cu; alloy 50, 0.25–0.50 Be, 1.4–1.7 Co, 0.9–1.1 Ag, balance Cu; alloy 35, 0.25–0.50 Be, 1.4–1.6 Ni, balance Cu. b Temper symbol designations: A, solution annealed; H, hard; HT, heat treated from hard; At, heat treated from solution annealed.
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