The AK12 alloy (AL2)

Designation

Name	The value
Designation GOST Cyrillic	АК12
Designation GOST Latin	AK12
Transliteration	AK12
By chemical elements	-

Name	The value
Designation GOST Cyrillic	АЛ2
Designation GOST Latin	AL2
Transliteration	AL2
By chemical elements	-

Description

The AK12 alloy is used: for the manufacture of ingots and castings of different casting methods (sand casting, investment casting, gravity die casting, pressure casting); casting parts mining and metallurgical machinery; casting parts, metallurgical equipment (thin-walled open-casting devices, housings of pumps and other components with high integrity, operating at temperatures above +200 °C). casting parts of pipe fittings and drives thereto; castings of complex configuration, including large, operating at low to medium loads and pressures not exposed to temperatures above 150 °C.

Note

Aluminum foundry alloy of the system Al-Si-Mg.
Thermally neurocinema alloy with low strength properties, satisfactory corrosion resistance to air, fresh water, oil and fuel, and reduced in sea water. has high casting properties (high fluidity, a capacity and integrity, small casting shrinkage, not prone to hot cracking). To increase the strength and ductility of the alloy subjected to modification. Is prone to formation of large gas porosity. The alloy has the worst machinability compared to other aluminum alloys.
Alloy is not recommended for producing parts that require high surface finish after machining.

Standards

Name	Code	Standards
Castings with special properties (iron and steel)	В83	KSt 81-033:2009
Non-ferrous metals, including rare, and their alloys	В51	GOST 1583-93, OST 4.021.009-92, OST 4.021.010-92
Castings, non-ferrous metals and alloys	В84	OST 26-07-1114-74, OST 1 80029-83, OST 24.916.01-71, OST 5.9397-90

Chemical composition

Standard	Mn	Si	Fe	Cu	Al	Ti	Zn	Zr	Mg
GOST 1583-93	≤0.5	10-13	≤0.7	≤0.6	Rest	≤0.1	≤0.3	≤0.1	≤0.1
OST 24.916.01-71	≤0.5	10-13	≤0.8	≤0.6	Rest	-	≤0.3	-	≤0.1
KSt 81-033:2009	≤0.5	10-13	-	≤0.6	Rest	≤0.1	≤0.3	≤0.1	≤0.1

Al is the base.
According to GOST 1583-93, the iron content is specified for casting in sand molds and for investment models. The content of iron during casting in the mold is ≤ 1.0%, when casting under pressure ≤ 1.50%. The amount of impurities accounted for should be for sand casting and for investment models ≤ 2.10%, die casting ≤ 2.20%, die casting ≤ 2.70%.
According to KSt 81-033: 2009, the total content of Zr + Ni ≤ 0.12%.
According to OST 24.916.01-71, the iron content is specified for casting in sand molds and for investment models. The content of iron during casting in the mold is ≤ 1.0%, when casting under pressure ≤ 1.50%. The amount of allowable impurities should be for casting in sand molds and for investment models ≤ 2.30%, die casting ≤ 2.20%, die casting ≤ 2.80%. When using an alloy for the manufacture of parts working in the marine environment, the copper content should not exceed 0.30%.

Mechanical properties

σ_U, MPa	d	HB, MPa
Casting as supplied. Without heat treatment
≥147	≥4	≥50
≥157	≥2	≥50
≥157	≥1	≥50
Casting, sand casting, investment casting, gravity die casting of a modified alloy in delivery condition. Without heat treatment
≥147	≥4	≥50
Casting, sand casting, investment casting, gravity die casting of the modified alloy. Mode T2: Annealing at 290-310 °C, exposure of 2-4 hours
≥137	≥4	≥50
Casting as supplied. Mode T2: Annealing at 290-310 °C, exposure of 2-4 hours
≥147	≥3	≥50
≥147	≥2	≥50

Description mechanical marks

Name	Description
σ_U	Limit short-term strength
d	Elongation after rupture
HB	Brinell hardness number

Physical characteristics

Temperature	Е, HPa	r, kg/m³	R, Mr. · m
20	70	2650	548

A description of the physical symbols

Name	Description
l	Coefficient of thermal conductivity
С	Specific heat

Technological properties

Name	The value
Weldability	Alloy welded satisfactorily gas and organomegaly methods.
Corrosion resistance	To improve the corrosion resistance of the alloy is subjected to anodic oxidation.