Steel KH12MF
Designation
| Name |
The value |
| Designation GOST Cyrillic |
Х12МФ |
| Designation GOST Latin |
X12MF |
| Transliteration |
H12MF |
| The chemical elements |
Cr12MoV |
Description
Steel KH12MF apply: when required a larger viscosity than that of steel grade 12X — for the manufacture of cold stamps high resistance to abrasion (mainly with working part rounded), not exposed to strong shocks and jolts; die plates and dies, eyes for the calibration metal rod under the knurling thread; bending and forming dies, complex dies sections body, which in the hardening should not be subjected to significant volume changes and warping; matrices and punches blanking and cutting dies; stampings of the active parts of electrical machines and electromagnetic systems of electric devices.
For the manufacture of rollers for the forming of complex shapes; sections of the different stamping dies complex forms; complex matrices dinoprostone in sheet metal forming, master gears, rolling dies, dies, matrices and punches blanking, cutting dies (including combined and sequential) with a complex configuration working parts; stampings of the active parts of electrical machines.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
В22 |
GOST 1133-71, GOST 2590-2006, GOST 2591-2006 |
| Sheets and stripes |
В33 |
GOST 4405-75, TU 14-1-1481-76, TU 14-131-971-2001 |
| Sectional and shaped rolling |
В32 |
GOST 5950-2000, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-781-73, TU 14-11-245-88 |
| Bulls. Blanks. Slabs |
В31 |
OST 24.952.01-89 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| GOST 5950-2000 |
1.45-1.65 |
≤0.03 |
≤0.03 |
0.15-0.45 |
11-12.5 |
0.1-0.4 |
≤0.4 |
The rest |
≤0.3 |
0.15-0.3 |
≤0.03 |
0.4-0.6 |
≤0.2 |
Fe is the basis.
Mechanical characteristics
| σB, MPa |
d5, % |
y, % |
| Samples of 10 mm diameter, 50 mm length, forged and annealed. The rate of deformation of 1.1 mm/min, strain rate of 0.0004 1/s |
| ≥140 |
≥44 |
≥68 |
| ≥125 |
- |
≥58 |
| ≥81 |
≥46 |
≥54 |
| ≥46 |
- |
≥49 |
| ≥25 |
≥48 |
≥48 |
Description mechanical marks
| Name |
Description |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
Physical characteristics
| Temperature |
r, кг/м3 |
R, НОм · м |
a, 10-6 1/°С |
| 20 |
7700 |
580 |
- |
| 300 |
- |
- |
109 |
| 600 |
- |
- |
114 |
| 800 |
- |
- |
122 |
A description of the physical symbols
| Name |
Description |
| 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 - 1140 °C, the end - 850 °C. Cooling in the pits or thermostats. |
| Workability by cutting |
In hot-rolled condition in NV 217-228 blower SB=710 MPa Kn TV.SPL.=0,80 Kn b.St.=0,3. |
| Grindability |
Satisfactory. |
