BrO8S12 (BrOS8-12)

responsible for bearings operating at high pressures

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Bronze	Tin cast bronze

Chemical composition

Standard	Fe, %	Sn, %	Mg, %	Bi, %	Cu, %	Ni, %	Al, %	Pb, %	P, %	S, %
Standard	Fe, %	Sn, %	Mg, %	Bi, %	Cu, %	Ni, %	Al, %	Pb, %	P, %	S, %
	< 0.2	7–9	< 0.02	< 0.005	76.155–82	< 1.5	< 0.02	11–13	< 0.05	< 0.05

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Physical characteristics

Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\rho$ , $\frac{kg}{m^3}$
Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\rho$ , $\frac{kg}{m^3}$
20	0.735		9100
100		17.1

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{Y}$ , $MPa$	$\sigma_{0.5}$ , $MPa$	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{Y}$ , $MPa$	$\sigma_{0.5}$ , $MPa$	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	Treatment
Casting				in sandy form	145–175	100	3–8	98–137
Casting				in chill mold	145–195	115

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Casting		in chill mold	78.5–118
Casting		in sandy form	68.5–98

Casting and technological parameters

melting point, °C	linear shrinkage, %	the temperature of the casting, °C
melting point, °C	linear shrinkage, %	the temperature of the casting, °C
940	1.4	1150

Coefficients of Friction

coefficient of friction with lubrication	coefficient of friction without lubrication
coefficient of friction with lubrication	coefficient of friction without lubrication
0.005	0.1

Standards

Standard	Description
Standard	Description
OST 24.916.01-71

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Sn	%	Tin
Mg	%	Magnesium
Bi	%	Bismuth
Cu	%	Copper
Ni	%	Nickel
Al	%	Aluminium
Pb	%	Lead
P	%	Phosphorus
S	%	Sulfur

Description of physical characteristics

Parameter	Units of measurement	Description
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
Parameter	Units of measurement	Description
$\sigma_{Y}$	$MPa$	Yield strength
$\sigma_{0.5}$	$MPa$	Tensile stress required to produce a total elongation of 0.5%
$\sigma _{U}$	$MPa$	Ultimate tensile strength
$KCU\cdot 10^{3}$	$\frac{J}{m^2}$	Impact toughness

Description of the casting and technological parameters

Parameter	Units of measurement	Description
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
linear shrinkage	%	The difference between model dimensions and the model casting
the temperature of the casting	°C	The temperature of the molten polymer is extruded from the heating cylinder into the mold