Beryllium copper  is a copper-based alloy containing beryllium (Be0.2～2.75%wt%), which is widely used in all beryllium alloys.
Its consumption has exceeded 70% of the total consumption of beryllium in the world today. Beryllium copper is a precipitation hardening alloy, which has high strength, hardness, elastic limit and fatigue limit after solution aging treatment, and has a small elastic hysteresis.
And has corrosion resistance (corrosion rate of beryllium bronze alloy in seawater: (1.1-1.4)×10-2mm/year. Corrosion depth: (10.9-13.8)×10-3mm/year.) After corrosion, the strength of beryllium copper alloy , Elongation rate has no change, so it can be maintained for more than 40 years in the water return,
Beryllium copper alloy is an irreplaceable material for the submarine cable repeater structure.
In the medium: the annual corrosion depth of beryllium copper at a concentration of less than 80% (at room temperature) is 0.0012 to 0.1175mm, and the corrosion is slightly accelerated if the concentration is greater than 80%. Wear resistance, low temperature resistance, non-magnetic, high conductivity, impact and no sparks. At the same time, it has good fluidity and the ability to reproduce fine patterns. Due to the many superior properties of beryllium copper alloy, it has been widely used in manufacturing.
Beryllium copper grades:
　1. China: QBe2, QBe1.7
　　2. America (ASTM): C17200, C17000
　　3. United States (CDA): 172, 170
　　4. Germany (DIN): QBe2, QBe1.7
　　 5. Germany (digital system): 2.1247, 2.1245
　　6. ​​Japan: C1720, C1700