Steel 25Х3МФА-
Designation
| Name |
The value |
| Designation GOST Cyrillic |
25Х3МФА-А |
| Designation GOST Latin |
25X3MFA-A |
| Transliteration |
25H3MFA-A |
| The chemical elements |
25Cr3MoVN- |
Description
Steel 25Х3МФА AND used: for the production of workpieces in the form of forgings, sheets, sheet blanks, the sheet of stamped blanks, Cavanaugh-rolled billets (slabs), used for products of machinery and vessels, working under pressure and within the jurisdiction of the Gosatomenergonadzor.
Standards
| Name |
Code |
Standards |
| Bulls. Blanks. Slabs |
В31 |
TU 108.131-86 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
As |
V |
Mo |
Sn |
Sb |
Co |
| TU 108.131-86 |
0.22-0.27 |
≤0.015 |
≤0.012 |
0.3-0.6 |
2.8-3.3 |
0.17-0.37 |
≤0.4 |
The rest |
≤0.1 |
≤0.01 |
0.25-0.35 |
0.6-0.8 |
≤0.005 |
≤0.005 |
≤0.025 |
Fe is the basis.
According to TU 108.131-86 the chemical composition is given for steel grade 25X3MFA. In the chemical composition, deviations are allowed: for carbon -0.010%, for manganese, silicon, and vanadium ± 0.050% for each chromium ± 0.10%. In steel, the total content of phosphorus, antimony, and tin should not be more than 0.015%. Additional determination of the content of zinc, lead and bismuth is carried out. The results of the determination are not delivery, but are recorded in the certificate.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
Brinell hardness number, MPa |
| Billet heat-treated in the delivery condition on the other 108.131-86 |
| ≤600 |
≥430 |
540-735 |
≥14 |
≥50 |
≥490 |
187-229 |
| ≤600 |
≥390 |
≥490 |
≥14 |
≥50 |
- |
- |
| ≤600 |
≥430 |
540-735 |
≥14 |
≥50 |
≥490 |
187-229 |
| ≤600 |
≥390 |
≥490 |
≥14 |
≥50 |
- |
- |
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 |
