Alloy AK8M (АЛ32)

Designation

Name	The value
Designation GOST Cyrillic	АК8М
Designation GOST Latin	AK8M
Transliteration	AK8M
By chemical elements	-

Name	The value
Designation GOST Cyrillic	АЛ32
Designation GOST Latin	AL32
Transliteration	AL32
By chemical elements	-

Description

Alloy AK8M used: for the manufacture of ingots and shaped castings by various casting methods (sand casting, investment casting, gravity die casting, pressure casting).

Note

Aluminum foundry alloy of the system Al-Si-Cu. The alloy has high integrity.

Standards

Name	Code	Standards
Non-ferrous metals, including rare, and their alloys	В51	GOST 1583-93, TU 48-26-10-77
Castings, non-ferrous metals and alloys	В84	OST 1 80029-83

Chemical composition

Standard	Mn	Si	Fe	Cu	Al	Ti	Zn	Zr	Mg
GOST 1583-93	0.3-0.5	7.5-9	≤0.7	1-1.5	Rest	0.1-0.3	≤0.3	≤0.1	0.3-0.5

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 casting in mold is ≤ 0.80%, when casting under pressure ≤ 0.90%. The amount of allowable impurities should be for casting in sand molds and for investment models ≤ 0.90%, casting in chill molds ≤ 1.00%, injection molding ≤ 1.10%.

Mechanical properties

σ_U, MPa	d	HB, MPa
Casting molding. Without heat treatment
≥255	≥2	≥70
Casting molding. Mode T2: Annealing at 270-290 °C (excerpt 5-8 hours)
≥235	≥2	≥60
Casting. Mode T1: Artificial aging without prior tempering at 190-210 °C (excerpt 5-8 hours)
≥176	≥0.5	≥60
≥196	≥1.5	≥70
≥284	≥1	≥90
Casting. Mode T5: two-stage heating: 500-510 °C (extract 4-6 h), 510-520 °C (delay of 4-8 hours), quenching in water + incomplete artificial aging at 145-155 °C (extract 10-15 hours)
≥235	≥2	≥60
≥255	≥2	≥70
Casting. T6 mode: Quenching in water from 510-520 °C (extract 2-8 h) + Complete artificial aging at 165-175 °With (extract 8-16 h)
≥245	≥1.5	≥60
≥265	≥2	≥70
Casting. Mode T7: two-stage heating: 500-510 °C (extract 4-6 h), 510-520 °C (delay of 4-8 hours), quenching in water with a temperature of 80-100 °C+ stabilizing vacation at 225-235 °C (aging for 3-5 hours)
≥225	≥2	≥60
≥245	≥2	≥60

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
20	71	2650

A description of the physical symbols

Name	Description
l	Coefficient of thermal conductivity
С	Specific heat