BrA7

Details for chemical engineering, sliding contacts; semi-finished products (sheets, strips, tapes, rods, tubes, wire, forgings)

Classification

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

Chemical composition

Standard Fe, % Si, % Sn, % Mn, % Cu, % Zn, % Al, % Pb, % P, %
GOST 18175-78 < 0.5 < 0.1 < 0.1 < 0.5 90.9–94 < 0.5 6–8 < 0.03 < 0.01

Information on suppliers

Physical characteristics

Temperature, °C E\cdot 10^{9}, MPa \alpha\cdot 10^{6}, K^{-1} \varkappa, \frac{W}{m\cdot K} \rho, \frac{kg}{m^3} R\cdot 10^{-6}, \Omega\cdot m
20 120 80 7800 0.11
100 17.8

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers \sigma _{U}, MPa \sigma_{P}, MPa \epsilon_L, % Treatment
Tape solid 570–780 470–760 3–5
Alloy soft 440–500 65–75
Alloy solid 950–1030 2–4

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Alloy soft 65–75
Alloy solid 200–220

Casting and technological parameters

melting point, °C Hot working temperature, °C annealing temperature, °C
1040 750–850 600–700

Coefficients of Friction

coefficient of friction with lubrication
0.012

Analogues

Germany USA
2.092 ERCuAl-A1
2.092

Standards

Standard Description
GOST 18175-78
GOST 1048-16

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Sn % Tin
Mn % Manganese
Cu % Copper
Zn % Zinc
Al % Aluminium
Pb % Lead
P % Phosphorus

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)
\varkappa \frac{W}{m\cdot K} Coefficient of thermal conductivity (the heat capacity of the material)
\rho \frac{kg}{m^3} The density of the material
R\cdot 10^{-6} \Omega\cdot m Electrical resistivity

Description of mechanical properties

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

Description of the casting and technological parameters

Parameter Units of measurement Description
melting point °C The temperature at which solid crystalline body makes the transition to the liquid state and Vice versa
Hot working temperature °C The temperature at which the plastic-deformed metal recrystallizes during the pressure treatment
annealing temperature °C The temperature at which the processes return recrystallization and homogenization of the metal to reduce its hardness for subsequent machining