Alloy Alsi9 (АЛ4)

Designation

Name	The value
Designation GOST Cyrillic	АК9ч
Designation GOST Latin	AK9ch
Transliteration	AK9ch
By chemical elements	-

Name	The value
Designation GOST Cyrillic	АЛ4
Designation GOST Latin	AL4
Transliteration	AL4
By chemical elements	-

Description

Ak9ch alloy used: for the manufacture of ingots and shaped castings by various casting methods (sand casting, investment casting, gravity die casting, pressure casting); details of medium and high loading; casting parts of valves and actuators; castings of high-and medium-load and high integrity in all ways, except for the molding.

Note

Aluminum foundry alloy of the system Al-Si-Mg. The alloy has high integrity.
Heat-treatable alloy with good strength properties. For corrosion resistance and technological characteristics of the alloy close to alloy grade AK12.

Standards

Name	Code	Standards
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 5.9397-90

Chemical composition

Standard	Mn	Si	Ni	Fe	Cu	Al	Zn	Sn	Pb	Mg	Be
GOST 1583-93	0.2-0.5	8-10.5	≤0.1	≤0.6	≤0.3	Rest	≤0.3	≤0.01	≤0.05	0.17-0.3	≤0.1

Al is the base.
According to GOST 1583-93, the total content of zirconium and titanium is ≤ 0.15%. The iron content is indicated for casting in sand molds and for investment models. The content of iron during casting into the mold is ≤ 0.90%, when casting under pressure ≤ 1.00%. The amount of allowable impurities should be for casting in sand molds and for investment models ≤ 1.10%, casting in chill molds ≤ 1.40%, injection molding ≤ 1.50%.

Mechanical properties

σ_U, MPa	d	HB, MPa
Casting (gravity die casting, pressure, liquid die forging, gravity die casting and sand casting of modified alloy). Mode T1: Artificial aging at 170-180 °C (excerpt 5-17 hours)
≥196	≥1.5	≥60
Casting (sand casting, investment casting, gravity die casting, pressure). Without heat treatment
≥147	≥2	≥50
Castings of the modified alloy. T6 mode: Quenching in water from 530-540 °C (extract 2-6 h) + Artificial aging at 170-180 °C (extract 10-15 hours)
≥225	≥3	≥70
≥235	≥3	≥70
Casting. T6 mode: Quenching in water from 530-540 °C (extract 2-6 h) + Artificial aging at 170-180 °C (extract 10-15 hours)
≥225	≥2	≥70
≥235	≥3	≥70

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	468

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.
Machinability	The alloy is well processed by cutting and grinding.
Corrosion resistance	To improve the corrosion resistance of the casting is subjected to anodic oxidation.