Designation
| Name |
The value |
| Designation GOST Cyrillic |
50Г2 |
| Designation GOST Latin |
50G2 |
| Transliteration |
50G2 |
| By chemical elements |
50Mn2 |
Description
50Г2 steel is used: for the manufacture of gears, friction disks, gear shafts and other parts working in abrasion.
Note
Structural steel high-quality manganese.
Standards
| Name |
Code |
Standards |
| Sheets and strips |
В23 |
GOST 103-2006 |
| Bars and shapes |
В32 |
GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 1050-2013, TU 14-1-2118-77, TU 14-11-245-88, TU 14-136-367-2008 |
| Bars and shapes |
В22 |
GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006 |
| Processing of metals by pressure. Forgings |
В03 |
GOST 8479-70, ST ЦКБА 010-2004 |
| Blanks. Of the workpiece. Slabs |
В31 |
OST 3-1686-90, TU 14-1-4944-90 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| GOST 4543-71 |
0.46-0.55 |
≤0.035 |
≤0.035 |
1.4-1.8 |
≤0.3 |
0.17-0.37 |
≤0.3 |
Rest |
≤0.3 |
≤0.05 |
≤0.03 |
≤0.15 |
≤0.2 |
Fe is the basis.
According to GOST 4543-71 the content in high-quality steel is regulated: P≤0,025%; S≤0.025%; Сu≤0.30%; in high-grade steel: P≤0,025%; S≤0.015%; Сu≤0.25%. In accordance with the order, the content of Mn = 1,2-1,6% can be established.
Mechanical properties
| Section, mm |
t отпуска, °C |
sT|s0,2, MPa |
σU, MPa |
d5, % |
d10 |
y, % |
KCU, kJ/m2 |
HB, MPa |
| Quenching in oil from 840 °C to + vacation at 650 °C, air cooling |
| ≤25 |
- |
420 |
730 |
11 |
- |
35 |
- |
- |
| Normalization |
| 100-300 |
- |
315 |
570 |
14 |
- |
35 |
334 |
167-207 |
| Quenching in oil from 820 °C to + leave + excerpt leave after 30 minutes, cooling in oil |
| - |
400 |
1200 |
1320 |
- |
5 |
37 |
- |
- |
| Normalization |
| ≤80 |
- |
- |
810 |
10 |
- |
40 |
- |
241 |
| 100 |
- |
315 |
570 |
17 |
- |
38 |
382 |
167-207 |
| Quenching in oil from 820 °C to + leave + excerpt leave after 30 minutes, cooling in oil |
| - |
500 |
980 |
1130 |
- |
12 |
43 |
- |
- |
| Normalization at 810-830 °C, cooling in air + vacation at 400-500 °C, air cooling |
| 300-500 |
- |
- |
680 |
12 |
- |
30 |
- |
241 |
| Normalization |
| 100-300 |
- |
345 |
590 |
17 |
- |
40 |
530 |
174-217 |
| Quenching in oil from 820 °C to + leave + excerpt leave after 30 minutes, cooling in oil |
| - |
600 |
680 |
830 |
- |
15 |
57 |
- |
- |
| Normalization |
| 100 |
- |
345 |
590 |
18 |
- |
45 |
579 |
174-217 |
| 100 |
- |
395 |
615 |
17 |
- |
45 |
579 |
187-229 |
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 |
| d10 |
Elongation after rupture |
| y |
The relative narrowing |
| KCU |
Toughness |
| HB |
Brinell hardness number |
Physical characteristics
| Temperature |
l, W/(m · °C) |
a, 10-6 1/°C |
| 100 |
41 |
113 |
| 200 |
40 |
122 |
| 300 |
38 |
122 |
| 400 |
36 |
- |
| 500 |
35 |
123 |
| 600 |
- |
147 |
| 800 |
- |
147 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| G |
Modulus of elasticity shear torsion |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
Technological properties
| Name |
The value |
| Weldability |
does not apply to welded structures. |
| Склонность к отпускной хрупкости |
inclined |
| The temperature of forging |
Start - 1200 °C, the end - 750 °C-800. Of the workpiece cross-section up to 100 mm are cooled in air, 101-200 mm - mulde, 201-300 mm in a sealed mulde. |
| Flock-sensitive sensitivity |
insensitive |
