Designation
| Name |
The value |
| Designation GOST Cyrillic |
20ХН3МФА |
| Designation GOST Latin |
20XH3MFA |
| Transliteration |
20HN3MFA |
| By chemical elements |
20CrН3MoV |
| Name |
The value |
| Designation GOST Cyrillic |
20ХН3МФ |
| Designation GOST Latin |
20XH3MF |
| Transliteration |
20HN3MF |
| By chemical elements |
20CrН3MoV |
Description
20ХН3МФА steel is used: for the manufacture of forgings of shafts of compressors and gas turbines, responsible for heavy-loaded parts operating at temperatures up to +500 °C.
Note
Structural steel high-quality hromonikelemolibdenovyh.
Standards
| Name |
Code |
Standards |
| Blanks. Of the workpiece. Slabs |
В31 |
TU НЗЛ 341-93 |
| Processing of metals by pressure. Forgings |
В03 |
TU НЗЛ 342-89 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Mo |
| TU НЗЛ 342-89 |
0.2-0.25 |
≤0.02 |
≤0.02 |
0.4-0.7 |
1.4-1.8 |
0.2-0.45 |
3-3.5 |
Rest |
≤0.3 |
0.06-0.12 |
0.4-0.6 |
Fe is the basis.
According to TU NZL 342-89 the chemical composition is given for steel grade 20ХН3МФА.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
KCU, kJ/m2 |
| Forged billet shafts of compressors and gas turbines, heat-treated in the delivery condition on the other NZL 342-89 (longitudinal samples, in the column of the delivery condition specified strength) |
| ≤350 |
590-785 |
≥705 |
≥15 |
≥35 |
≥490 |
| ≤250 |
687-883 |
≥803 |
≥14 |
≥35 |
≥490 |
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 |
| KCU |
Toughness |
Technological properties
| Name |
The value |
| Weldability |
Does not apply to welded structures. |
| Склонность к отпускной хрупкости |
Tend not. |
| The temperature of forging |
Start - 1200 °C, the end - of 800 °C. the cross Sections up to 100 mm was cooled in the pit, over 100 mm are subjected to low temperature annealing. |
| Flock-sensitive sensitivity |
Excessively sensitive. |
