Alloy МА8
Designation
| Name |
The value |
| Designation GOST Cyrillic |
МА8 |
| Designation GOST Latin |
MA8 |
| Transliteration |
MA8 |
| The chemical elements |
CuAl8 |
Description
Alloy МА8 used: for the manufacture of semi-finished products (sheets, plates, rods, sheets, tubes, wire, stampings and forgings) by hot deformation; extruded sections with cross sectional area up to 12 cm2 and a diameter of the circumscribed circle of up to 150 mm; ingots and slabs intended for the production of articles of complex shape and welded constructions with maximum operating temperatures up to +200 °C — long, up to +250 °C — short-term.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
В52 |
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 19657-84, GOST 29296-92, GOST 29303-92, GOST Р 50066-92, GOST Р 50067-92, GOST Р 50077-92 |
| Non-ferrous metals, including rare metals, and their alloys |
В51 |
GOST 14957-76, OST 4.021.009-92 |
| Bars |
В55 |
GOST 18351-73 |
| Pipes from non-ferrous metals and alloys |
В64 |
GOST 19441-74 |
| Sheets and stripes |
В53 |
GOST 22635-77, OST 4.021.048-92, TU 1-9-203-77, TU 1-9-334-87, TU 1-9-388-73 |
Chemical composition
| Standard |
Mn |
Si |
Ni |
Fe |
Cu |
Al |
Zn |
Ce |
Mg |
Be |
| GOST 14957-76 |
1.3-2.2 |
≤0.1 |
≤0.007 |
≤0.05 |
≤0.05 |
≤0.1 |
≤0.3 |
0.15-0.35 |
The rest |
≤0.002 |
Mg is the basis.
According to GOST 14957-76 the mass fraction of other impurities is ≤ 0.30%. "Other impurities" include impurities whose permissible content limits are not indicated (≤), as well as impurities not included in the table, the content of which is not determined. Beryllium is not determined, but is introduced by calculation.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d |
Brinell hardness number, MPa |
| Rolled steel in the delivery state |
|
140-160 |
220-250 |
7-12 |
≥40 |
| Sheet metal in delivery condition according to GOST 22635-77, OST 4.021.048-92 (samples transverse) |
| 1-1.5 |
≥145 |
≥225 |
≥8 |
- |
| 1.5-3 |
≥135 |
≥215 |
≥6 |
- |
| 0.6-2.5 |
≥120 |
≥225 |
≥12 |
- |
| 2.5-10.5 |
≥110 |
≥215 |
≥10 |
- |
| Extruded GOST 19657-84 without heat treatment in the state of delivery |
|
- |
≥205 |
≥10 |
≥40 |
| Bars and rods, hot-pressed in the delivery condition without heat treatment according to GOST 18351-73 (longitudinal samples) |
| 100-160 |
- |
≥195 |
≥2 |
- |
| 160-200 |
- |
≥175 |
≥1 |
- |
| 5-50 |
- |
≥215 |
≥4 |
- |
| 50-100 |
- |
≥205 |
≥3 |
- |
| Tubes extruded in the state of delivery according to GOST 19441-74 (samples) |
| - |
- |
≥225 |
≥8 |
- |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d |
Elongation after rupture |
Physical characteristics
| Temperature |
Е, ГПа |
r, кг/м3 |
l, Вт/(м · °С) |
R, НОм · м |
| 20 |
42 |
1780 |
1339 |
51 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| С |
Specific heat |
