Designation
| Name |
The value |
| Designation GOST Cyrillic |
20ГЛ |
| Designation GOST Latin |
20GL |
| Transliteration |
20GL |
| By chemical elements |
20Mn |
Description
The 20GL steel is used: for the manufacture of disks, sprockets, gear rims, drums and other parts, which are requirements for strength and toughness, working under static and dynamic loads; for the manufacture of 3-th group casting parts of pipe fittings in North version with the testing of impact toughness KCU-60≥300 kJ/m2 (3.0 kgs·m/cm2) operating at temperatures of the working medium from -60 up to +350 °C without restriction of the nominal working pressure; responsible cast parts of automatic coupler and trucks of freight and passenger cars, electric and disulphoton and locomotives.
Note
Cold-resistant steel.
Standards
| Name |
Code |
Standards |
| Castings with special properties (iron and steel) |
В83 |
GOST 21357-87 |
| Steel castings |
В82 |
GOST 977-88, OST 24.920.01-80, TU 24.05.486-82, ST ЦКБА 014-2004 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
| GOST 977-88 |
0.15-0.25 |
≤0.04 |
≤0.04 |
1.2-1.6 |
- |
0.2-0.4 |
- |
Rest |
- |
| TU 24.05.486-82 |
0.17-0.25 |
≤0.04 |
≤0.04 |
1.1-1.4 |
≤0.3 |
0.3-0.5 |
≤0.3 |
Rest |
≤0.3 |
| GOST 21357-87 |
0.17-0.25 |
≤0.02 |
≤0.02 |
1.1-1.4 |
≤0.3 |
0.3-0.5 |
≤0.3 |
Rest |
≤0.3 |
Fe is the basis.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d |
y, % |
KCU, kJ/m2 |
HB, MPa |
| Annealing in air with 870-890 °C + vacation at 620-650 °C, air cooling |
| 100 |
≥334 |
≥530 |
≥14 |
≥25 |
≥383 |
- |
| Normalization at 880-900 °C + vacation at 600-650 °C, air cooling |
| 100 |
≥275 |
≥540 |
≥18 |
≥25 |
≥491 |
143-187 |
| Casting parts well.d. composition. Normalizing or normalizing + vacation |
| - |
294-343 |
≥490 |
≥20 |
≥30 |
≥490 |
- |
| - |
≥343 |
≥510 |
≥18 |
≥25 |
≥490 |
- |
| Casting. Quenching in water from 920-940 °C + vacation at 600-620 °C, air cooling (KCU-60) |
| - |
≥400 |
≥500 |
≥15 |
≥30 |
≥3 |
- |
| Casting. Normalization at 920-940 °C, air cooling (KCU-60) |
| - |
≥300 |
≥500 |
≥20 |
≥35 |
≥3 |
- |
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 |
| d |
Elongation after rupture |
| y |
The relative narrowing |
| KCU |
Toughness |
| HB |
Brinell hardness number |
