Designation
| Name |
The value |
| Designation GOST Cyrillic |
А20 |
| Designation GOST Latin |
A20 |
| Transliteration |
A20 |
| By chemical elements |
- |
Description
Steel A20 is used: for the manufacture of small parts and machines, lightly loaded parts of complex configuration requirements of high dimensional accuracy and surface quality; after carburizing and cyanidation — lightly loaded parts, which are tejavanija wear resistance and high surface quality.
Note
Sulfur carbon steel high machinability.
Standards
| Name |
Code |
Standards |
| Bars and shapes |
В32 |
GOST 1414-75, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-11-245-88 |
| Bars and shapes |
В22 |
GOST 2590-2006, GOST 2591-2006, GOST 2879-2006 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
| GOST 1414-75 |
0.17-0.25 |
0.08-0.15 |
≤0.06 |
0.7-1 |
≤0.25 |
0.15-0.35 |
≤0.25 |
Rest |
≤0.25 |
Fe is the basis.
Mechanical properties
| Section, mm |
σU, MPa |
d5, % |
y, % |
HB, MPa |
| The hot rolled, without heat treatment |
|
≥450 |
≥20 |
≥30 |
≤168 |
| Rental of calibrated and full hard without heat treatment |
|
≥530 |
≥7 |
- |
≤217 |
Description mechanical marks
| Name |
Description |
| σU |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
| HB |
Brinell hardness number |
Technological properties
| Name |
The value |
| Weldability |
does not apply to welded structures |
| Склонность к отпускной хрупкости |
tend not |
| The temperature of forging |
Start - 1180 °C, the end - 850 °C. |
| Flock-sensitive sensitivity |
sensitive |
