Steel 9Х2МФ (9Х2МФА)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
9Х2МФ |
| Designation GOST Latin |
9X2MF |
| Transliteration |
9H2MF |
| The chemical elements |
9Cr2MoV |
| Name |
The value |
| Designation GOST Cyrillic |
9Х2МФА |
| Designation GOST Latin |
9X2MFA |
| Transliteration |
9H2MFA |
| The chemical elements |
9Cr2MoV |
Description
9Х2МФ steel is used: for the manufacture of working rolls of cold rolling of metals, in particularly severe conditions; the work rolls of wire cogging and section rolling mills; other important products with improved service characteristics.
Standards
| Name |
Code |
Standards |
| Machines and equipment for metallurgical and foundry industry |
Г44 |
OST 24.013.04-90, OST 24.013.20-90, OST 24.013.21-85 |
| Sectional and shaped rolling |
В32 |
TU 14-19-100-90 |
| Metal forming. Forgings |
В03 |
TU 4121-002-33902054-2004 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Mo |
| OST 24.013.04-90 |
0.85-0.95 |
≤0.03 |
≤0.03 |
0.2-0.7 |
1.7-2.1 |
0.25-0.5 |
≤0.5 |
The rest |
≤0.25 |
0.1-0.2 |
0.2-0.3 |
| TU 14-19-100-90 |
0.85-0.95 |
≤0.01 |
≤0.025 |
0.2-0.35 |
1.7-2.1 |
0.25-0.45 |
≤0.3 |
The rest |
≤0.25 |
0.1-0.3 |
0.2-0.3 |
Fe is the basis.
According to OST 24.013.04-90 the chemical composition is given for steel grade 9X2MF.
According to TU 14-19-100-90 the chemical composition is given for steel grade 9Х2МФ-Ш. The total content of nickel and copper should not be more than 0.50%. Permissible deviations from the norms of chemical composition - according to GOST 5950.
Mechanical characteristics
| sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
| A sample with a diameter of 6 mm, length 30 mm forged and annealed. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s |
| ≥100 |
≥135 |
≥47 |
≥91 |
| ≥105 |
≥135 |
≥51 |
≥95 |
| ≥41 |
≥50 |
≥53 |
≥100 |
| ≥21 |
≥30 |
≥75 |
≥100 |
| ≥11 |
≥12 |
≥71 |
≥100 |
| ≥125 |
≥160 |
≥45 |
≥83 |
Description mechanical marks
| Name |
Description |
| 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 |
Physical characteristics
| Temperature |
r, кг/м3 |
l, Вт/(м · °С) |
С, Дж/(кг · °С) |
| 20 |
7840 |
- |
- |
| 100 |
- |
37 |
440 |
| 200 |
- |
34 |
460 |
| 300 |
- |
32 |
500 |
| 400 |
- |
32 |
570 |
| 500 |
- |
32 |
680 |
| 600 |
- |
30 |
800 |
| 700 |
- |
23 |
940 |
| 800 |
- |
20 |
1100 |
| 900 |
- |
14 |
500 |
| 1000 |
- |
- |
500 |
| 1200 |
- |
- |
500 |
A description of the physical symbols
| Name |
Description |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
Technological properties
| Name |
The value |
| Weldability |
Does not apply to welded structures. |
| Propensity to temper brittleness |
Inclined. |
| Forging temperature |
Start - 1180 °C, the end - of 800 °C. the cross Sections up to 300 mm are cooled in the pit. |
| Flock-sensitive sensitivity |
Sensitive. |
| Workability by cutting |
In the annealed condition with NV 170-207 and blower SB=610 MPa Kn TV.SPL.=0,85 Kn b.St.=0,80. |
| Macrostructure and contamination |
In microtracker steel bars under the control of the etched templeto should not be the remnants of shrinkage and podnasadochnogo looseness, birdhouses, cracks, subcortical bubbles, delaminations, placenow, foreign non-metallic and slag inclusions, visible without using the magnifying devices. Allowed the Central porosity, point heterogeneity, liquation Pousada segregated square, common spotted liquation - small 1 mark for each parameter; layer-by-layer crystallization and the light loop - no more than 3 points. |
| Microstructure |
Microstructure of steel bars shall conform to the following standards: microporosity is not allowed; carbide liquation - not more than 2 points; structural (carbide) banding - no more than 4 points. |
