Designation
| Name |
The value |
| Designation GOST Cyrillic |
30Х2НВА |
| Designation GOST Latin |
30X2HBA |
| Transliteration |
30H2NVA |
| By chemical elements |
30Cr2НW |
Description
30Х2НВА steel is used: for the manufacture of heavily loaded machine parts (shafts, axles, gears).
Note
Structural alloy steel with reduced Nickel content.
Standards
| Name |
Code |
Standards |
| Classification, nomenclature and General rules |
В20 |
OST 1 90005-91 |
| Blanks. Of the workpiece. Slabs |
В31 |
TU 1-92-156-90 |
| Bars and shapes |
В32 |
TU 14-1-1885-85, TU 14-1-950-74 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| TU 14-1-1885-85 |
0.27-0.34 |
≤0.015 |
≤0.025 |
0.3-0.6 |
1.6-2 |
0.17-0.37 |
1.4-1.8 |
Rest |
≤0.25 |
- |
- |
- |
1.2-1.6 |
| TU 14-1-950-74 |
0.27-0.34 |
≤0.025 |
≤0.025 |
0.3-0.6 |
1.6-2 |
0.17-0.37 |
1.4-1.8 |
Rest |
≤0.25 |
≤0.05 |
≤0.03 |
≤0.15 |
1.2-1.6 |
Fe is the basis.
According to TU 14-1-1885-85 the chemical composition is given for steel grade 30Х2НВА-ВД. To ensure the required grain size, it is allowed to introduce vanadium in the steel smelting at the rate of its content in steel no more than 0.10%, the content of which in steel is not determined. The presence of molybdenum up to 0.15%, titanium up to 0.030% is not a defective feature. In the steel, partial replacement of tungsten with residual molybdenum is allowed from the calculation: one part by weight of molybdenum replaces three parts by weight of tungsten, while the content of tungsten in steel should not be less than 0.70%. The allowable variation in manganese content in steel is ± 0.010%.
Mechanical properties
| Section, mm |
t отпуска, °C |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
KCU, kJ/m2 |
HB, MPa |
HRC |
| Bars and strip hot rolled and forged. Quenching in oil with 850-870 °C + vacation, air cooling or oil |
|
540-560 |
≥980 |
≥1180 |
≥10 |
≥45 |
≥785 |
341-388 |
- |
| Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91 |
| - |
- |
- |
- |
- |
- |
- |
331-363 |
36-39 |
| Bars and strip hot rolled and forged. Quenching in oil with 850-870 °C + vacation, air cooling or oil |
|
580-620 |
≥835 |
≥980 |
≥12 |
≥55 |
≥1177 |
302-341 |
- |
| Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91 |
| - |
- |
- |
980-1130 |
- |
- |
- |
285-341 |
30-36 |
| Bars of steel 30Х2НВА on the other 14-1-1885-85. Quenching in oil with 850-870 °C + Vacation, air cooling or oil. In the graph KCU KCU values are shown along the fiber/KCU across the grain |
| 25 |
540-560 |
≥980 |
≥1180 |
≥10 |
≥45 |
≥785/- |
341-387 |
- |
| 25 |
580-620 |
≥835 |
≥980 |
≥12 |
≥55 |
≥1177/- |
302-341 |
- |
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 |
| HB |
Brinell hardness number |
| HRC |
Rockwell hardness (indenter diamond spheroconical) |
Technological properties
| Name |
The value |
| Macrostructure and pollution |
Macrostructure of steel when testing for the breaks in the longitudinal direction and transverse templeto selected from rolled, should not have shrinkage, porosity, bubbles, cracks, delamination, inclusions and placenow and defects of fracture, listed in Annex 3 GOST 10243. The Central porosity, point heterogeneity and phase separation in the square should not exceed 1 points; layer-by-layer crystallization and the bright loop - 3 points reference scales GOST 10243. All other defects under GOST 10243, are not allowed. Pollution steel non-metallic inclusions should be according to the average score is not higher (in points): oxides of point 1,5, 2,0 stroke oxides, silicates fragile 1,0, 1,0 silicates plastic, silicates, non-deformed 2,5, 2,5 sulfides, nitrides stroke and point 1,0. |
