Alloy aluminum AL21

Chemical composition

Al	Aluminum	Rest
Fe	Iron	<0.6
Si	Silicon	<0.5
Mg	Magnesium	0.8 — 1.3
Mn	Manganese	0.15 — 0.25
Cu	Copper	4.6 — 6.0
Ni	Nickel	2.6 — 3.6
Cr	Chromium	0.1 — 0.2
Zn	Zinc	<0.3
Ot	Total impurities	<1.3

For the manufacture of shaped castings. Technical requirements GOST 2685−75 Cast aluminum alloys. Stamps

Classification

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

Chemical composition

Standard	Fe, %	Si, %	Mg, %	Mn, %	Cr, %	Cu, %	Zn, %	Ni, %	Al, %
Standard	Fe, %	Si, %	Mg, %	Mn, %	Cr, %	Cu, %	Zn, %	Ni, %	Al, %
GOST 2685-75	< 0.6	< 0.5	0.8–1.3	0.15–0.25	0.1–0.2	4.6–6	< 0.3	2.6–3.6	87.35–91.75

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Physical characteristics

Temperature, °C	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$
Temperature, °C	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$
20		117.6	2830
100	22.9

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	Treatment
Alloy					180–210		1
Casting				in sandy form	220	200	1.5

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Alloy			65–75

Casting and technological parameters

linear shrinkage, %
linear shrinkage, %
1.3

Standards

Standard	Description
Standard	Description
GOST 2685-75

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mg	%	Magnesium
Mn	%	Manganese
Cr	%	Chrome
Cu	%	Copper
Zn	%	Zinc
Ni	%	Nickel
Al	%	Aluminium

Description of physical characteristics

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$\alpha\cdot 10^{6}$	$K^{-1}$	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

Description of mechanical properties

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