Designation
| Name |
The value |
| Designation GOST Cyrillic |
12Г2МФТ |
| Designation GOST Latin |
12G2MFT |
| Transliteration |
12G2MFT |
| By chemical elements |
12Mn2MoVTi |
Description
12Г2МФТ steel is used: for the manufacture of electro-welded anchor chains increased accuracy; details of railway bridges North of execution.
Note
Rolled steel 12Г2МФТ thickness up to 40 mm is characterized by not only higher strength but also higher performance of fracture toughness in a wide temperature range.
Standards
| Name |
Code |
Standards |
| Bars and shapes |
В32 |
TU 3-867-85 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
| TU 3-867-85 |
0.12-0.17 |
≤0.03 |
≤0.035 |
1.4-1.7 |
≤0.3 |
0.2-0.4 |
≤0.3 |
Rest |
≤0.3 |
0.02-0.05 |
0.02-0.05 |
0.1-0.17 |
Fe is the basis.
According to TU 3-867-85 the chemical composition is presented for steel grade 12Г2МФТ-СШ. In the finished bars, with all the requirements of technical specifications, deviations in chemical composition are allowed: by carbon +0.010%, for silicon ± 0.050%, for manganese ± 0.050%, for titanium ± 0.020%.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d |
y, % |
KCU, kJ/m2 |
| Bars gorjachekatanye on the other 3-867-85. Normalization at 890-910 °C + Vacation at 600-650 °C, air cooling (KCU at -40 °C) |
| 25 |
≥245 |
≥490 |
≥22 |
≥55 |
≥784 |
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 |
| Macrostructure and pollution |
The macrostructure of the steel on the other 3-867-85 intended for the production of bars, checking on the etched templeto should not have residues shrinkage, porosity, bubbles, cracks, delamination, inclusions and placenow visible to the naked eye. Allowed the Central porosity, point heterogeneity and phase separation in the square no more than 2 points; pousadela liquation not more than 1 score. Macrostructure of steel shall have no common boundary segregation, subcortical bubbles and intergranular cracks. |
| Particularities of production of goods |
Steel brand 12Г2МФТ-SSH is melted in basic open-hearth furnaces with the processing of liquid synthetic slag. Bars shall withstand the bend test specimens on the mandrel with a thickness equal to two diameters of the rod at an angle of 180°. The bending point should be no cracks, tears, delamination and fracture. Bars on the other 3-867-85 are supplied in heat-treated (Normalizing + Tempering). |
