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PRODUCT DATA of CDA 170
MaterialCDA 170
Chemical Composition1.8% Be, 0.3% Co + Ni, Rem. Cu
EXPERIENCE IN PRACTICE
Equivalent DesignationsASTM B194; BS 2870; BS 2873; CB101; CDA170; Beryllium-Copper 1.8%
Space ExperienceGood
PHYSICAL PROPERTIES
Specific Gravity8.25
ELECTRICAL PROPERTIES
Electrical Conductivity18 to 38 %IACS
Remark:Solution treated has the lowest conductivity.
THERMAL PROPERTIES
Thermal Conductivity84 to 150 W/m.K
Thermal Expansion Coefficient17 μstrain/°C
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
Atmospheric CorrosionGenerally good
Stress Corrosion StatusHigh Resistance to SCC: Table 1
Remark:High resistance only when solution treated/work hardened, then precipitation hardened
Data Quality: Design Data
SPECIAL RECOMMENDATIONS
Special RecommendationsThe 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.
Lessons LearnedDo use non-spark tooling including chisels, spanners, shovels etc