Designation
| Name |
The value |
| Designation GOST Cyrillic |
30Г2 |
| Designation GOST Latin |
30G2 |
| Transliteration |
30G2 |
| By chemical elements |
30Mn2 |
Description
Steel 30G2 used: for the manufacture of crankshafts, axle shafts, axles, clutch levers, fork gear shift, flange.
Note
Structural steel high-quality manganese.
Standards
| Name |
Code |
Standards |
| Bars and shapes |
В32 |
GOST 4543-71, GOST 14955-77, GOST 1050-2013, TU 14-1-2118-77, TU 14-11-245-88, TU 14-1-1271-75, TU 14-1-5228-93, TU 14-136-367-2008 |
| Bars and shapes |
В22 |
GOST 8319.0-75 |
| Blanks. Of the workpiece. Slabs |
В31 |
OST 3-1686-90, TU 14-1-5349-97, TU 14-1-4944-90 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| GOST 4543-71 |
0.26-0.35 |
≤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 |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
| Annealing in air at 880 °C + vacation at 600 °C, air cooling |
| ≤25 |
345 |
590 |
15 |
45 |
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 |
| y |
The relative narrowing |
Technological properties
| Name |
The value |
| Склонность к отпускной хрупкости |
inclined |
| Flock-sensitive sensitivity |
insensitive |
