X12MF steel
X12MF steel
X12MF Steel: Handbook of steels and alloys. Below is systematized information on the purpose, chemical composition, types of supply, substitutes, critical point temperature, physical, mechanical, technological and foundry properties for the brand — Steel X12MF.
General information on X12MF steel
| The substitute for the following steel grades |
| X12MF steel grade: Х6ВФ, Х12Ф1, Х12ВМ. |
| Kind of delivery |
| Cr12mf round, Cr12mf band, Cr12mf sheet, sections, including shaped: GOST 5950−73, GOST 2590−71, GOST 2591−71. Calibrated bar GOST 5950−73, GOST 7417−75, GOST 8559−75, GOST 8560−78. Grinded rod and silversilver GOST 5950−73, GOST 14955−77. Strip GOST 4405−75. Forged and forged blanks GOST 5950−74, GOST 1133−71, GOST 7831−78. |
| Application |
| Complex shaped profiling rollers, sections of complex shaped die body, complex hole punching dies for sheet metal forming, reference gears, rolling dies, draws, dies and punches of punching dies with complex configuration of working parts, dies of the active part of electric machines. |
Chemical composition of X12MF steel
| Chemical element |
% |
| Vanadium (V) |
0.15−0.30 |
| Silicon (Si) |
0.10−0.40 |
| Manganese (Mn) |
0.15−0.45 |
| Copper (Cu), not more |
0.30 |
| Molybdenum (Mo) |
0.40−0.60 |
| Nickel (Ni), not more than |
0.35 |
| Sulfur (S), not more than |
0.030 |
| Carbon (C) |
1.45−1.65 |
| Phosphorus (P), not more than |
0.030 |
| Chrome (Cr) |
11.00−12.50 |
Mechanical properties of X12MF steel
Mechanical properties depending on test temperature
| t test temperature, °C |
σB, MPa |
δ5, % |
ψ, % |
| Samples with diameter of 10 mm, length 50 mm, forged and annealed. Strain rate 1.1 mm/min, strain rate 0.0004 1/s. |
| 700 |
140 |
44 |
68 |
| 800 |
125 |
|
58 |
| 900 |
81 |
46 |
54 |
| 1000 |
46 |
|
49 |
| 1100 |
25 |
48 |
48 |
| 1200 |
8 |
3 |
14 |
Technological properties of X12MF steel
| Forging temperature |
| Beginning 1140, end 850. Cooling in wells or thermostats. |
| Weldability |
| Not applicable for welded constructions. |
| Machinability |
| In the hot-rolled condition at HB 217−228 and σB = 710 MPa Kυ dv.spl. = 0.80, Kυ b.st. = 0.3. |
| The tempering capacity |
| inclined |
| Grindability |
| satisfactory |
Temperature of X12MF steel critical points
| Critical point |
°С |
| Ac1 |
810 |
| Ac3 |
860 |
| Ar3 |
780 |
| Ar1 |
760 |
| Mn |
225 |
Impact toughness of steel X12MF
Impact toughness, KCU, J/cm2
| Delivery condition, heat treatment |
KCU |
HRCe |
| Hardening at 1000−1030 С, oil. Tempering at 200 °C with 1.5h dwell time. |
43 |
63 |
| Tempering at 1000−1030°C in oil. Tempering at 300 °C with holding for 1.5 hours. |
64 |
61 |
| Tempering at 1000−1030°C. Tempering at 400 °C with holding for 1.5 hours. |
54 |
60 |
| Tempering at 1000−1030°C in oil. Tempering at 500 °C with holding for 1.5 hours. |
30 |
60 |
| Tempering at 1000−1030°C in oil. Tempering 550 C with holding for 1.5 hours. |
|
52 |
Hardness of the steel X12MF
| Delivery condition, heat treatment regime |
HRCe surface |
HB |
| Rings and strips annealed or high-temperatured |
|
255 |
| Samples. Hardened at 970 C, oil. Tempering 180 C. |
61 |
|
| Hardening at 1020 °C, air. Tempering at 200 C. |
63 |
|
| Hardening 1020 C, air. Tempering at 300 °C. |
61 |
|
| Hardening 1020 C, air. Tempering at 400 °C. |
60 |
|
| Hardening 1020 C, air. Tempering at 500 °C. |
61 |
|
| Isothermal annealing: heating at 850−870 C, cooling at 40 deg/h to 700−720 C, holding for 3−4 h, cooling at 50 deg/h to 550 C, air. |
|
255 |
| Heating at 650−700 C. Tempering at 1000−1030 С, oil. Tempering 190−210 C, 1.5h, air (final heat treatment mode) |
61−63 |
|
| Heating at 650−700°C. Tempering at 1000−1030°C, saltpeter. Tempering at 320−350°C, 1.5h, air (final heat treatment mode) |
58−59 |
|
Tensile strength of steel X12MF
| σ-1, MPa |
Heat treatment, state of steel |
| 800 |
HRCe 60 |
| 650 |
HRCэ 56 |
Physical properties of X12MF steel
| Test temperature,°C |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| Steel density, pn, kg/m3 |
7700 |
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| Electrical resistivity (p, nominal value — m) |
580 |
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| Test temperature,°C |
20−100 |
20−200 |
20−300 |
20−400 |
20−500 |
20−600 |
20−700 |
20−800 |
20−900 |
20−1000 |
| Coefficient of linear expansion (a, 10−6 1/°C) |
10.9 |
|
|
11.4 |
|
12.2 |
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Heat resistance, red resistance of steel X12MF
Heat resistance
| Temperature, °C |
Time, h |
Hardness, HRCэ |
| 150−170 |
1 |
63 |
| 490−510 |
1 |
59 |
