A.2.2. Beryllium-Copper (CDA 170)
PRODUCT
Type			Metal Alloy
Chemical Composition			1.8% Be, 0.3% Co + Ni, Rem. Cu
Manufacturer	NGK BERYLCO UK Ltd. UNIT "E" Houston Park, Montford street, Salford M5 2RP UK			Tel: +44 (0)161 745 7162 Fax: +44 (0)161 745 7520 Email: enquiries@ngkberylco.co.uk www.ngkberylco.co.uk/europe.htm
EXPERIENCE & AVAILABILITY
Development Status			Commercial Product
Cost Range			Low
Lot Reproducibility			ASTM B194, BS 2870, BS 2873, CB101
Space Experience			Good
GENERAL PROPERTIES (Physical, Mechanical, Thermal, Electrical, Optical)
Nature			Typical Value		Remarks
Specific Gravity			8.25		@ Room Temperature
Ultimate Tensile Strength			460 to 1500 MPa		@ Room Temperature
Proof Stress (0.2%)			125 to 1100 MPa		@ Room Temperature
Elongation at Break			2 to 50%		@ Room Temperature
Thermal Conductivity			84 to 150 W m^-1 °C^-1		@ Room Temperature
Thermal Expansion Coefficient			17 x 10^-6 °C^-1		@ Room Temperature
PROPERTIES RELEVANT TO SPACE USE
Nature		Typical Value				Type of Test
Corrosion		Generally good.
Stress Corrosion		High resistance only when solution treated/work hardened, then precipitation hardened.
SPECIAL RECOMMENDATIONS
· The alloy is age-hardeneable and the heat treatment is as follows: - solution treat 760 - 820°C – Water Quench - age 315 - 350°C – Air Cool · Solution treatment may be from 10 to 30 minutes for light materials (i.e. wire or strip), extending up to several hours for bulky castings. Precipitation hardening normally requires 2 hours at 310°C or 30 minutes at 350°C. · Fabrication methods involving either welding, brazing or high temperature soldering should be performed whilst the alloy is in the soft condition and then followed by the solution and ageing treatments.