BrB2.5

for the manufacture of springs and elastic members;

Classification

Country Section Category
CIS, Russia, Ukraine Bronze Pressureless bronze plated

Chemical composition

Standard Fe, % Si, % Be, % Cu, % Ni, % Al, % Pb, %
TU 48-21-96-72 < 0.15 < 0.15 2.3–2.6 96.4–97.5 0.2–0.5 < 0.15 < 0.005

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ $$\rho$$, $$\frac{kg}{m^3}$$
20 133 16.6 8230

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\epsilon_L$$, % Treatment
Alloy soft 580 25
Alloy solid 1350 1–2

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Alloy soft 130
Alloy solid 360

Standards

Standard Description
TU 48-21-96-72

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Be % Beryllium
Cu % Copper
Ni % Nickel
Al % Aluminium
Pb % Lead

Description of physical characteristics

Parameter Units of measurement Description
$$E\cdot 10^{9}$$ $$MPa$$ Elastic modulus
$$\alpha\cdot 10^{6}$$ $$K^{-1}$$ Coefficient of thermal (linear) expansion (range 20°C–T)
$$\rho$$ $$\frac{kg}{m^3}$$ The density of the material

Description of mechanical properties

Parameter Units of measurement Description
$$\sigma _{U}$$ $$MPa$$ Ultimate tensile strength
$$\epsilon_L$$ % Elongation at break (longitudinal)