Beryllium Copper 275C UNS C82800

Lead-freeUNS C82800 Highest Strength and Hardness BeCu Grade Lowest Pouring Temperature BeCu Excellent Wear Resistance

Highest-strength BeCu alloy UNS C82800 with maximum hardness; wear resistance; and fluidity. Lowest pouring temperature of BeCu alloys. Forms: shot and ingot.

Solidus

1,625°F (885°C)

Liquidus

1,710°F (932°C)

Density

0.292 lbs/in³ (8.09 g/cm³)

Primary Elements

Cu · Be · Co · Si · Ti

Nominal Composition

0.07% Ti, 0.3% Si, 0.5% Co, 2.7% Be, 96.43% Cu

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Product Overview

Beryllium Copper 275C (UNS C82800) offers the highest strength and hardness of all the standard BeCu casting alloys combined with excellent wear resistance and outstanding fluidity in the liquid state. The high beryllium content gives 275C its superior hardness and wear resistance after age hardening while the excellent fluidity allows extremely fine detail reproduction in ceramic mold and pressure casting processes. A key practical advantage of 275C is that it has the lowest pouring temperature of all the BeCu casting alloys – this lower processing temperature reduces energy consumption; minimizes beryllium oxidation during melting and pouring; and allows almost any type of molding process to be used including wax-based investment; ceramic shell; sand; and pressure casting. Beryllium safe handling protocols apply to all operations. Forms: 1/2 and down polished shot; 1/2 x 14 mesh unpolished shot; and 2-5 lb ingot.

Available Forms

1/2" and Down Polished Shot, 1/2" X 14 Mesh Unpolished Shot, 2-5 Ingot

Product Code

4971

Technical Info

Thermal Properties

Melting Point (Solidus)1,625°F (885°C)

Melting Point (Liquidus)1,710°F (932°C)

Physical Properties

Density (imperial)0.292 lbs/in³

Density (metric)8.09 g/cm³

Primary ElementsCu · Be · Co · Si · Ti

SpecificationUNS C82800

Lead FreeYes

Key Features

Highest Strength and Hardness BeCu GradeLowest Pouring Temperature BeCuExcellent Wear Resistance

Nominal Composition

96.43% Cu
2.7% Be
0.5% Co
0.3% Si
0.07% Ti

Frequently Asked Questions

Common technical inquiries regarding Beryllium Copper 275C UNS C82800

The higher beryllium content in 275C shifts the alloy composition closer to a beryllium-rich region of the Cu-Be phase diagram where the liquidus temperature is lower than at the compositions used in 20C and lower-Be grades. This means the alloy becomes fully liquid at a lower absolute temperature reducing the required pouring temperature. For the foundry this translates to lower furnace energy requirements; less wear on refractory crucibles and molds; and reduced beryllium vaporization and oxidation at the melt surface.

Ceramic mold and lost wax investment casting benefit most from 275C's excellent fluidity because these processes produce the finest surface detail and tightest dimensional tolerances. The alloy's ability to fill thin sections; sharp internal corners; and textured surfaces in ceramic molds enables the production of precision mold inserts for plastic injection molding where surface texture must be reproduced at a microscopic level. Pressure casting also benefits from the combination of fluidity and low pouring temperature producing dense castings with fine detail.

Age-hardened BeCu 275C C82800 achieves Rockwell C hardness of approximately 38-46; comparable to many P20 and H13 tool steels used in plastic injection mold tooling. The critical advantage of BeCu over tool steel in mold applications is not hardness but thermal conductivity: BeCu conducts heat approximately 4-6 times better than tool steel; dramatically reducing mold cooling time and improving production cycle rates. For molds where cycle time is the economic bottleneck; BeCu 275C inserts in critical heat-extraction zones of an otherwise steel mold represent a standard engineering practice.