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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                  
Electrical resistivity (p, nominal value — m) 580                  
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        

Heat resistance, red resistance of steel X12MF

Heat resistance

Temperature, °C Time, h Hardness, HRCэ
150−170 1 63
490−510 1 59