Designation
| Name |
The value |
| Designation GOST Cyrillic |
45ГЛ |
| Designation GOST Latin |
45GL |
| Transliteration |
45GL |
| By chemical elements |
45Mn |
Description
Steel 45GL used: for the manufacture of castings of blocks, wheels, sprockets, jaw clutch, the large gear rims and other parts requiring high hardness and strength.
Standards
| Name |
Code |
Standards |
| Steel castings |
В82 |
GOST 977-88, TU 24-1-12-181-75 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Si |
Fe |
| GOST 977-88 |
0.4-0.5 |
≤0.04 |
≤0.04 |
0.8-1.2 |
0.2-0.5 |
Rest |
Fe is the basis.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d |
y, % |
KCU, kJ/m2 |
| Hardening in air, 840-860 °C + vacation at 600-650 °C, air cooling |
| 100 |
≥334 |
≥628 |
≥13 |
≥20 |
≥285 |
| Normalization at 870-890 °C + vacation at 570-600 °C, air cooling |
| 100 |
≥334 |
≥579 |
≥14 |
≥25 |
≥285 |
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 |
Technological properties
| Name |
The value |
| Weldability |
limited weldability |
| Склонность к отпускной хрупкости |
tend not |
| Flock-sensitive sensitivity |
not sensitive |
| Machinability |
After quenching and tempering at NV 241-278 and blower SB=850-980 MPa Kn TV.SPL.=0,63 Kn b.St.=0.55 |