Beryllium mill-products (rod, wire, pipe)
It is entirely possible that a sword of legendary Achilles was forged out of hardened beryllium copper.
Merits of bronze alloy Cu2Be
Grade: tinless, pressure-treated bronze. Cu2Be possesses high level of strength and durability, excellent antifriction characteristics, resistance to corrosion, perfect deformability. It is strengthened in hardened condition.
Industrial usage: manufacture of springs, elastic parts.
Percentage composition of alloy according to GOST 18175 -78
|Cu||96.9 — 98|
|Be||1.8 — 2.1|
|Ni||0.2 — 0.5|
Alloy hardness: HB 10 -1 = 130 — 150 MPа
Point of melting: 995°C
Tinless bronzes including Cu2Be alloy do not contain a scarce tin in its composition. However, they are often superior to other non-ferrous alloys by their consumption possibilities.
Tinless bronzes can be not only beryllium but manganese or aluminium as well, depending on the main alloying component. Beryllium coppers are manufactured in accordance with GOST 18175−78. This standard is applied to pressure-treated tinless bronzes which intended for a manufacture of sheet and flat mill-products.
Mechanical characteristics (temperature is 20°С).
|Range of sizes||GOST||
|Soft wire||15834 — 77||343−686||15−60|
|Hard wire||15834 — 77||735−1372|
R 10 9(Ohm-m)
a 10 -6 (1/Degree)
E 10— -5 (MPa)
|— differential deposit at a process of first crack appearing, %||å||— ultimate tensile strength (rupture strength), MPa||σv|
|— maximum shear stress, ultimate torsional strength, MPa||Jê||— elastic strength, MPa||σ0,05|
|— ultimate bending strength, MPa||σ bend||— conventional yield limit, MPa||σ0,2|
|— fatigue endurance limit during bending test with symmetrical load cycle, MPa||σ-1||— percentage elongation after rupture, %||δ5,δ4,δ10|
|— fatigue endurance limit during torsion test with symmetrical load cycle, MPa||J-1||— yield point (contraction), MPa||σc 0,05|
|— amount of load cycling||n||— relative shear, %||v|
|— specific electrical resistance, Ohm/m||R and ρ||— short ultimate tensile strength, MPa||sv|
|— standard module of elasticity HPa||E||— contraction ratio, %||ψ|
|— properties getting temperature, Degree||T||— impact hardness, which is established on specimens with concentrators in accordance with V and U types, J/cm2||KCU and KCV|
|— heating capacity of alloy (heat conduction coefficient), V/(m°С)||l||— permanent change of form — yield point (proportionality), MPa||sT|
|— specific heat of alloy (temperature range is 20°С), [J/(kg-deg)]||C||— Brinell hardness||HB|
|— density, kg/m3||pn and r||— Vicker’s hardness||HV|
|— lineal thermal expansion coefficient (in a temperature range of 20°С), 1/°С||a||— Rockwell hardness C||HRC|
|— long-time strength limit, MPa||σtТ||— Rockwell hardness B||HRB|
|— module of elasticity at a process of torsional shear, HPa||G||— Shore hardness||HSD|
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