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Beryllium Copper Alloy 25 (UNS C17200/CDA 172)
Technical Data Sheet
| Chemical Composition Limits | ||||
| Weight % | Cu | Al | Be | Co |
| AMS 4533 CDA 172 |
Rem | 0.20 | 1.8-2.0 | 0.2 min |
CDA 172 Beryllium Copper is commonly used due to it's high strength and hardness compared to other commercial copper alloys. CDA 172 strength and hardness is similar to that of steel. To achieve it's high strengths whilst still maintaining acceptable levels of toughness for many industrial applications CDA 172 is age hardened. Toughness, fatigue strength, corrosion resistance etc can be modified and controlled by either underaging or overaging during the precipitation hardening process of the alloy.
Typical Mechanical Properties
| Material | Condition | Size | Tensile strength ksi | Yield Strength ksi | Elongation 2" % | Hardness |
| CDA 172 Round Bar | Sol + Precipitation heat treated ( TF00 formerly AT) | 165 | 140 | 4 | 36-45 HRC | |
| CDA 172 Round Bar | Sol Treated, Cold Worked + Precipitation Heat Treated (TH04, formerly HT) | < 0.375" | 182 | 157 | 3 | 37-45 |
| CDA 172 Round Bar | Sol Treated, Cold Worked + Precipitation Heat Treated (TH04, formerly HT) | 0.375" - 1.00" | 180 | 154 | 3 | 37-45 |
| CDA 172 Round Bar | Sol Treated, Cold Worked + Precipitation Heat Treated (TH04, formerly HT) | 1.00" - 2.00" | 177 | 150 | 3 | 37-45 |
Physical Properties
Density - 0.298 lb/in3 at 68 F
Coefficient of Thermal Expansion - 9.9 ·10-6 per oF (68-572 F)
Thermal Conductivity - 62 - 70 Btu · ft/(hr · ft2·oF)at 68 F
Relative Magnetic Permeability (u) - 1.003
Modulus of Elasticity in Tension - 18500 ksi
Machinability Rating - 0%
Typical Uses of CDA 172 (AMS 4533, AMS 4534, AMS 4535, AMS 4650, AMS 4651)
Oil & Gas -
Instrument Housings, Flex Shafts, MWD & LWD Components, Bearings, Bushings, Valve Components, Pump Shafts
Aerospace - Landing Gear Bushings, Aircraft Components, Cryogenics
Automotive - RWMA Tooling, Plastic Molds, Electronic Components
Electrical - Contact Bridges, Clips, Spring Connectors, Current Carrying Navigational Instruments, Relay Parts, Electrical Switch and Relay Blades, Connectors, Switch Parts, Fuse Clips
Fasteners - Bolts, Screws, Roll Pins, Retaining Rings, Lock Washers,Belleville Washers, Fasteners, Washers
Other Industrial - Flexible Metal Hose, Non Sparking Safety Tools, Shafts, Pump Parts, Rolling Mill Parts, Bearings, Bushings, Valve Seats, Valve Stems, Diaphragms, Housings for Instruments, Wear Plates onHeavy Equipment, Bourdon Tubes, Bellows, Springs, WeldingEquipment, Spline Shafts, Valves, Pumps, Springs,Electrochemical
Ordinance -
Firing Pins
Availability
CDA 172 is available in Sheet, Plate, Bar, Strip, Pipe, Rod, Forgings, Extrusions, Tube, Wire. CDA 172 Foil (Shim) is available in various thicknesses. View stock list for further information. Foil Stock List. For all other stock availability contact Sales.
Specifications
| Bar | AMS 4650, AMS 4651, AMS 4533, ASTM B194, ASTM B196, MIL C 21657, SAE J463, SAE J461 |
| Extrusions | ASTM B570 |
| Forgings | AMS 4650, ASTM B570 |
| Plate | ASTM B194 |
| Rod | AMS 4650, AMS 4534, AMS 4651, AMS 4533, ASTM B196, MIL C 21657, SAE J463, SAE J461 |
| Rod, Forging | AMS 4650 |
| Sheet | ASTM B 194 |
| Strip | ASTM B 194, SAE J463, SAE J461 |
| Tube Seamless | AMS 4535, ASTM B643 |
| Wire | AMS 4725, ASTM B197, SAE J463, J461 |
| Other | UNS C17200 |
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Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.
