AL9 (AK7ch)

For the manufacture of shaped castings; The alloy has a high tightness.

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Aluminum, aluminum alloys	Foundry aluminum alloys

Chemical composition

Standard	Fe, %	Si, %	Be, %	Sn, %	Mg, %	Mn, %	Cu, %	Zn, %	Al, %	Pb, %
Standard	Fe, %	Si, %	Be, %	Sn, %	Mg, %	Mn, %	Cu, %	Zn, %	Al, %	Pb, %
GOST 1583-93	< 1.5	6–8	< 0.1	< 0.01	0.2–0.4	< 0.5	< 0.2	< 0.3	89.6–93.8	< 0.05

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Physical characteristics

Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	$c\cdot 10^{-3}$ , $\frac{J}{kg\cdot K}$	$R\cdot 10^{-6}$ , $\Omega\cdot m$
Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	$c\cdot 10^{-3}$ , $\frac{J}{kg\cdot K}$	$R\cdot 10^{-6}$ , $\Omega\cdot m$
20	0.7			2660		45.7
100		21.8	155		880

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{Y}$ , $MPa$	$\sigma_{0.5}$ , $MPa$	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{Y}$ , $MPa$	$\sigma_{0.5}$ , $MPa$	Treatment
Casting				in sandy form	170	120	2
Casting				in chill mold	230	140	4

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Alloy			45–70

Casting and technological parameters

linear shrinkage, %
linear shrinkage, %
1

Analogues

USA	Germany
USA	Germany
323	G-AlSi7Mg

Standards

Standard	Description
Standard	Description
GOST 1583-93
GOST 2171-90	GOST 2171-90
GOST 2685-75
GOST Р 55375-2012

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Be	%	Beryllium
Sn	%	Tin
Mg	%	Magnesium
Mn	%	Manganese
Cu	%	Copper
Zn	%	Zinc
Al	%	Aluminium
Pb	%	Lead

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)
$\varkappa$	$\frac{W}{m\cdot K}$	Coefficient of thermal conductivity (the heat capacity of the material)
$\rho$	$\frac{kg}{m^3}$	The density of the material
$c\cdot 10^{-3}$	$\frac{J}{kg\cdot K}$	The specific heat of the material (range 20°C–T)
$R\cdot 10^{-6}$	$\Omega\cdot m$	Electrical resistivity

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

Description of the casting and technological parameters

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
linear shrinkage	%	The difference between model dimensions and the model casting