Designation
| Name |
The value |
| Designation GOST Cyrillic |
30Х2НМФА |
| Designation GOST Latin |
30X2HMFA |
| Transliteration |
30H2NMFA |
| By chemical elements |
30Cr2НMoV |
| Name |
The value |
| Designation GOST Cyrillic |
30Х2НМФ |
| Designation GOST Latin |
30X2HMF |
| Transliteration |
30H2NMF |
| By chemical elements |
30Cr2НMoV |
Description
30Х2НМФА steel is used: for the manufacture of forgings (forgings of IV and V groups) gears and wheel gears, shafts, bushings and clips gear couplings compressor machines; forged blanks shafts of compressors and gas turbines; performance parts high strength and toughness, working in conditions of alternating loads (crankshafts, gears, connecting rods, etc.); parts of large cross section requiring high hardenability.
Note
Alloy structural steel vysokokachestvennoj.
Often steel parts 30Х2НМФА applied nitriding.
Standards
| Name |
Code |
Standards |
| Bars and shapes |
В32 |
TU 14-1-950-74 |
| Processing of metals by pressure. Forgings |
В03 |
TU НЗЛ 318-88, TU НЗЛ 342-89 |
| Blanks. Of the workpiece. Slabs |
В31 |
TU НЗЛ 341-93 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| 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 |
0.18-0.28 |
≤0.03 |
0.4-0.5 |
≤0.2 |
| TU НЗЛ 342-89 |
0.27-0.34 |
≤0.025 |
≤0.025 |
0.3-0.6 |
1.6-2 |
0.17-0.37 |
1.4-1.8 |
Rest |
≤0.3 |
0.18-0.28 |
- |
0.4-0.55 |
- |
Fe is the basis.
According to TU 14-1-950-86, TU NZL 318-88, TU NZL 342-89 the chemical composition is given for steel grade 30Х2НМФА.
Mechanical properties
| Section, mm |
t отпуска, °C |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
KCU, kJ/m2 |
HB, MPa |
| 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) |
| ≤450 |
- |
687-883 |
≥803 |
≥14 |
≥35 |
≥490 |
- |
| ≤400 |
- |
736-931 |
≥852 |
≥13 |
≥35 |
≥490 |
- |
| Forging parts gear compressor machines heat-treated in the delivery condition on the other NZL 318-88 (longitudinal samples) |
| 800-1000 |
- |
640-930 |
≥735 |
≥12 |
≥40 |
≥440 |
255-311 |
| 600-800 |
- |
675-930 |
≥785 |
≥12 |
≥40 |
≥440 |
262-311 |
| 400-600 |
- |
735-981 |
≥835 |
≥12 |
≥40 |
≥490 |
269-321 |
| 400 |
- |
785-981 |
≥880 |
≥12 |
≥45 |
≥590 |
285-321 |
| Bars and strip hot rolled and forged on the other 14-1-950-86. Quenching in oil with 890-910 °C + vacation, air cooling or oil |
| 25 |
610-660 |
≥834 |
≥1030 |
≥12 |
≥55 |
≥981 |
302-341 |
| 25 |
560-625 |
≥981 |
≥1177 |
≥10 |
≥45 |
≥687 |
341-388 |
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 |
