Alloy AK4 (1140)

Designation

Name The value
Designation GOST Cyrillic АК4
Designation GOST Latin AK4
Transliteration AK4
By chemical elements -
Name The value
Designation GOST Cyrillic 1140
Designation GOST Latin 1140
Transliteration 1140
By chemical elements 1140

Description

Alloy AK4 is used: for the manufacture of parts for jet engines.

Standards

Name Code Standards
Bars В55 GOST 21488-97, GOST Р 51834-2001, OST 1 90395-91, TU 1-2-83-77
Non-ferrous metals, including rare, and their alloys В51 GOST 4784-97
Bars and shapes В52 GOST 8617-81, GOST 13616-97, GOST 13617-97, GOST 13618-97, GOST 13619-97, GOST 13620-90, GOST 13621-90, GOST 13622-91, GOST 13623-90, GOST 13624-90, GOST 13737-90, GOST 13738-91, GOST 17575-90, GOST 17576-97, GOST 29296-92, GOST 29303-92, GOST Р 50066-92, GOST Р 50067-92, GOST Р 50077-92, OST 1 92093-83
Processing of metals by pressure. Forgings В03 OST 1 90073-85
Tubes of non-ferrous metals and alloys В64 TU 1-2-361-79, TU 1-2-69-77

Chemical composition

Standard Mn Si Ni Fe Cu Al Ti Zn Mg
GOST 4784-97 ≤0.2 0.5-1.2 0.8-1.3 0.8-1.3 1.9-2.5 Rest ≤0.1 ≤0.3 1.4-1.8
Al is the base.
According to GOST 4784-97, the mass fraction of each other impurity (not regulated) ≤ 0.05%, the total mass fraction of other impurities ≤ 0.10%.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % HB, MPa
Forgings supplied. Without heat treatment
≥260 ≥360 ≥3 ≥100
Forging cross-sections up to 300 mm and forming a cross-section up to 150 mm OST 1 90073-85. Mode T1: Quenching + artificial aging (in the cross section indicates the direction of the samples)
≥255 ≥355 ≥3 ≥100
≥265 ≥365 ≥4 ≥100
≥265 ≥365 ≥4 ≥100
≥275 ≥375 ≥5 ≥100
Profiles and pressed bars normal strength according to GOST 8617-81, GOST 21488-97 in the delivery condition (longitudinal samples)
- ≥355 ≥8 -

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
HB Brinell hardness number

Physical characteristics

Temperature Е, HPa r, kg/m3 l, W/(m · °C)
20 72 2770 180

A description of the physical symbols

Name Description
Е The normal elasticity modulus
r Density
l Coefficient of thermal conductivity
R UD. the resistivity