Steel 27ХН3М2ФА (27ХН3М2Ф)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
27ХН3М2ФА |
| Designation GOST Latin |
27XH3M2FA |
| Transliteration |
27HN3M2FA |
| The chemical elements |
27CrН3Mo2V |
| Name |
The value |
| Designation GOST Cyrillic |
27ХН3М2Ф |
| Designation GOST Latin |
27XH3M2F |
| Transliteration |
27HN3M2F |
| The chemical elements |
27CrН3Mo2V |
Description
27ХН3М2ФА steel is used: for the manufacture of forgings of shafts of compressors and gas turbines.
Standards
| Name |
Code |
Standards |
| Bulls. Blanks. Slabs |
В31 |
TU 108.11.389-87, TU НЗЛ 341-93 |
| Metal forming. Forgings |
В03 |
TU НЗЛ 342-89 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Mo |
| TU 108.11.389-87 |
0.24-0.3 |
≤0.02 |
≤0.02 |
0.2-0.6 |
1.35-1.75 |
0.17-0.37 |
3.25-3.75 |
The rest |
≤0.3 |
0.08-0.18 |
0.45-0.6 |
| TU НЗЛ 342-89 |
0.24-0.3 |
≤0.02 |
≤0.02 |
0.2-0.45 |
1.35-1.75 |
0.17-0.37 |
3.25-3.75 |
The rest |
≤0.3 |
0.08-0.18 |
0.45-0.6 |
Fe is the basis.
According to TU NZL 342-89 the chemical composition is given for steel grade 27HN3M2FA. For the steel of electroslag remelting 27ХН3М2ФА-Ш, manganese content in the range of 0.20-0.60% is allowed.
According to TU 108.11.389-87, the chemical composition is given for steel grade 27HN3M2FA of the initial melting produced in open-hearth or electric-arc furnaces with subsequent processing at the out-of-furnace refining and vacuuming plant (the casting is carried out in a vacuum). It is allowed to smelt the parent metal in a sour open-hearth furnace by a duplex process or in the main electric arc furnace with a vacuum casting. Deviations in chemical composition are allowed: by carbon ± 0.010%, by silicon ± 0.020%, by manganese ± 0.020%, by molybdenum ± 0.020%, by chromium ± 0.050%, by nickel -0.10%, by vanadium +0.020%. After the ESR, a determination of sulfur is made, which should not be more than 0.015%.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
| 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) |
| ≤550 |
687-883 |
≥803 |
≥14 |
≥35 |
≥490 |
| ≤500 |
736-931 |
≥852 |
≥13 |
≥35 |
≥490 |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |
Technological properties
| Name |
The value |
| Weldability |
Difficult weldability. |
| Propensity to temper brittleness |
Malosolone. |
| Forging temperature |
Start - 1200 °C, the end of - 900 °C. |
| Flock-sensitive sensitivity |
A highly sensitive. |
