Designation
| Name |
The value |
| Designation GOST Cyrillic |
42ХМФА |
| Designation GOST Latin |
42XMFA |
| Transliteration |
42HMFA |
| By chemical elements |
42CrMoV |
| Name |
The value |
| Designation GOST Cyrillic |
42ХМФ |
| Designation GOST Latin |
42XMF |
| Transliteration |
42HMF |
| By chemical elements |
42CrMoV |
Description
42ХМФА steel is used: for the manufacture of hot rolled long products; crankshafts KAMAZ; various loaded parts operating at temperatures up to +450 °C.
Note
Structural steel high quality chrome-molybdenum-vanadium.
Standards
| Name |
Code |
Standards |
| Bars and shapes |
В22 |
GOST 2591-2006 |
| Bars and shapes |
В32 |
TU 14-1-5083-91, TU 14-1-5520-2005, TU 14-1-4702-89 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Mo |
| TU 14-1-5083-91 |
0.4-0.45 |
0.007-0.025 |
≤0.025 |
0.5-0.8 |
1-1.3 |
0.17-0.37 |
≤0.3 |
Rest |
≤0.3 |
0.08-0.12 |
0.35-0.45 |
| TU 14-1-5520-2005 |
0.4-0.44 |
0.015-0.03 |
≤0.025 |
0.5-0.8 |
1-1.3 |
0.17-0.37 |
≤0.3 |
Rest |
≤0.3 |
0.08-0.12 |
0.35-0.45 |
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
KCU, kJ/m2 |
HB, MPa |
| Bars hot rolled (154х154±2) steel 42ХМФА to the engine crankshaft on the other 14-1-5083-91. Quenching in oil from 860 °C to + Vacation at 580 °C, cooling in oil (in the section specified cutting direction and cross-section samples) |
| Поперечный 25х25 |
≥716 |
≥835 |
≥7 |
≥25 |
≥392 |
255-277 |
| Продольный 25х25 |
≥716 |
≥835 |
≥12 |
≥42 |
≥784 |
255-277 |
| Rolled steel heat-treated on the other 14-1-5520-2005 (longitudinal samples) |
| Образец 25х25 мм |
≥715 |
≥830 |
≥12 |
≥42 |
≥784 |
- |
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 |
Technological properties
| Name |
The value |
| Macrostructure and pollution |
The macrostructure of bars on the other 14-1-5520-2005 when checking on the etched templeto or fracture should not have shrink holes, porosity, bubbles, cracks, delamination, inclusions, placenow and must comply with: - Central porosity ≤ 3 points; - Point nonuniformity ≤ 3 score; - square of phase separation ≤ 2 points; - Pousada liquation ≤ 2 points; - phase separation of the strips ≤ 1 point. Pollution steel non-metallic inclusions should be (on the average score/maximum score): - Sulphides (S) ≤ a 3.0/3.0 points; - point Oxides and stroke (FROM, OS) ≤ 3,0/5,0 GPA - fragile Silicates, plastic, non-deformable (CX, SP, SN) ≤ a 3.0/4.0 score. |
| Microstructure |
The size of austenitic grain bars on the other 14-1-5520-2005 should be no larger than 6 rooms. |
| Particularities of production of goods |
Bars on the other 14-1-5520-2005 put the definition of hardenability - the Hardness HRC at a distance of 9 mm from the hardened end ≥ 55, at a distance of 24 mm ≥ 40, at a distance of 48 mm ≥ 30. |
