The AK7 alloy

Designation

Name	The value
Designation GOST Cyrillic	АК7
Designation GOST Latin	AK7
Transliteration	AK7
By chemical elements	-

Description

The AK7 alloy used: for the manufacture of various ingots and shaped castings by various casting methods (sand casting, investment casting, gravity die casting, pressure); casting of parts of metallurgical equipment.

Note

Aluminum foundry alloy of the system Al-Si-Mg.
Heat-treatable alloy with good strength properties, but with reduced toughness and corrosion resistance.
Technological characteristics of the alloy close to alloy grade Ak7ch.

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
Castings, non-ferrous metals and alloys	В84	OST 1 80029-83, OST 5.9397-90

Chemical composition

Standard	Mn	Si	Ni	Fe	Cu	Al	Ti	Zn	Zr	Mg
GOST 1583-93	0.2-0.6	6-8	≤0.3	≤1.1	≤1.5	Rest	-	≤0.5	-	0.2-0.5
KSt 81-033:2009	≤0.5	6-8	-	-	≤0.2	Rest	≤0.05	-	≤0.01	0.2-0.4

Al is the base.
According to GOST 1583-93, the iron content is specified for casting in sand molds and for investment models. The iron content for molding in the mold is ≤ 1.20%, when casting under pressure ≤ 1.30%. The amount of impurities accounted for should be for casting in sand molds and for investment models ≤ 3.10%, casting in chill molds ≤ 3.20%, injection molding ≤ 3.30%.
According to KSt 81-033: 2009, the total content of Zr + Ni ≤ 0.15%.

Mechanical properties

σ_U, MPa	d	HB, MPa
Casting as supplied. Without heat treatment
≥127	≥0.5	≥60
≥157	≥1	≥60
≥147	≥0.5	≥65
≥167	≥1	≥50
Casting. Mode T5: Quenching in water from 530-540 °C (extract 2-7 h) + artificial aging at 145-155 °C (extract 1-3 hours)
≥176	≥0.5	≥75
≥196	≥0.5	≥75

Description mechanical marks

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