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Elmedur B2Pb

Product catalog summary

Material Overview: Elmedur B2Pb is a precipitation hardened alloy known for its good thermal conductivity and high hardness. It features excellent machinability due to its lead content. The chemical composition includes Beryllium (2.0%), Cobalt (0.4%), Lead (0.4%), with Copper as the balance.

Product Forms: Available in round, square, and flat bars, discs, rings, and forged pieces.

Heat Treatment:

Solution Annealing: 750–800 °C for 1/2 hour, cooled in water, achieving a maximum hardness of 210 HV.
Precipitation Hardening: Conducted at 325 °C for a minimum of 2 hours, cooled in water or air, reaching approximately 400 HV.

Mechanical Properties:

Hardness: Ranges from 360–430 HV depending on the cross-section and treatment.
Tensile Strength: Between 1,150–1,500 N/mm².
Yield Strength: Between 1,000–1,400 N/mm².
Elongation: Minimum of 1–3% depending on the condition.

Physical Properties:

Density: 8.3 g/cm³.
Thermal Conductivity: Ranges from 120 W/m•K at 20 °C to 230 W/m•K at 300 °C.
Coefficient of Thermal Expansion: 17.0•10^-6 K^-1 from 0–300 °C.

Applications: Used in spring contacts and the watch industry.

Machining Recommendations:

Turning and Milling: Use of Tungsten Carbide or HSS tools with specific cutting speeds and rake angles.
Drilling: Twist drills with an enlarged twist angle are recommended for better chip flow.

Standards and Tolerances: Complies with DIN EN 12 163, 12 165, and 12 167 for various forms.

Health and Safety: Contains beryllium, cobalt, and nickel; inhalation of dust and steam should be avoided. Follow R-phrases and S-phrases during machining.

Additional Notes: The datasheet provides reference values and does not guarantee specific properties unless agreed upon in writing.

Catalog excerpts

Elmedur B2PbTechnical Datasheet Short-Name Precipitation hardened alloy with good thermal conductivity and high hardness. Very good machinability due to the lead content. Spring contacts Watch industry Round-, square- and flat -bars, discs, rings and forged pieces (available sizes can be found in our current stock list) Elmedur B2Pb I Wieland Duro

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Elmedur B2Pb Technical Datasheet Machining (Reference values) Conditions: solution annealed Restance to tempering of Elmedur B2 Cutting speed m/min. Rake angle as to required surface finish as to required surface finish Chips breaker Hardness of Elmedur B2 at elevated temperatures Cutting speed m/min. Rake angle Feed (mm/min) Precipitation hardening behaviour at 598 K (325 °C) of Elmedur B2 from the solution annealed condition 30 0 0,1 1 Time of precipitation, hardening in hours *) Brinell hardness at R.T. after 5 hrs. annealing; cooling in air For a better ship flow, drills with an enlarged...

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Elmedur B2Pb

Elmedur B2Pb

Catalog excerpts

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