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X12F1 steel

X12F1 steel

X12F1 steel: a classifier of steels and alloys. Below is systematized information on the purpose, chemical composition, types of supply, substitutes, critical point temperatures, physical, mechanical, technological and foundry properties for the brand — Steel X12F1.

General information on steel X12F1

The substitute for the following steels
Of steel grade: Х6ВФ, Х6В3ФМ.
Kind of delivery
Circle X12F1, bar stock, 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, master gears, knurling dies, draws, sections of complex shaped car body dies, complex hole punching dies for sheet metal forming, dies and punches of punching and punching dies with complex configuration of working parts, punches and dies of cold extrusion working at pressure up to 1400−1600 MPa.

Chemical composition of Kh12F1 steel

Chemical element %
Vanadium (V) 0.70−0.90
Silicon (Si) 0.15−0.35
Manganese (Mn) 0.15−0.40
Copper (Cu), not more 0.30
Nickel (Ni), not more than 0.35
Sulfur (S), not more than 0.030
Carbon (C) 1.25−1.45
Phosphorus (P), not more than 0.030
Chrome (Cr) 11.0−12.50

Process properties of steel X12F1

Forging temperature
The beginning 1160, the end 850. The sections up to 200 mm are subjected to low-temperature annealing with one subcooling.
Weldability
Not applicable for welded constructions.
Machinability
In the hot-rolled condition at NV 217−228 Kυ dv.spl. = 0.8, Kυ b.st. = 0.3.
Tendency to tempering ability
is not inclined
Floc-sensitivity
not sensitive
Grindability
satisfactory

Temperature of X12F1 steel critical points

Critical point °С
Ac1 810
Ac3 860
Ar3 780
Ar1 760
Mn 225

Impact toughness of steel X12F1

Impact toughness, KCU, J/cm2

Delivery condition, heat treatment KCU HRCe
1030−1050 С hardening, oil. Tempering at 200 °C with 1.5h dwell time. 24 63
Hardening at 1030−1050°C. Tempering at 300 C with holding for 1.5 hours. 29 60
Quenching at 1030−1050 С, oil. Tempering at 400 C with holding for 1.5 hours. 65 59
Quenching at 1030−1050°C, oil. Tempering at 450 C with holding for 1.5 hours. 73 59
Quenching at 1030−1050°C. Tempering 500 C with holding for 1.5 hours. 35 59

Hardness of steel X12F1

Delivery condition, heat treatment regime HRCe surface HB
Rings and strips annealed or high-temperatured   255
Samples. 1050−1100 C hardened, oil 61  
High tempering: heating from v<=100 deg/h to 760-790 C, cooling with furnace or in air.   207−255
Annealing: heating with v<=100 deg/h to 850-870 C, cooling with a furnace with v<=50 deg/h to 500-600 C, air   207−255
Isothermal annealing 850−870 C, cooling with v=40 deg/h to 700−720 C, holding for 3−4 h, cooling with v=50 deg/h to 550 C, air.   255
Heating at 650−670 C. Hardening at 1030−1050 С, oil. Tempering at 180−200 C, 1.5h, air (final heat treatment mode) 61−63  
Tempering at 650−670°C. Tempering at 1030−1050°C, saltpeter. Tempering at 400−420°C, 1.5h, air (final heat treatment mode) 58−59  
Tempering at 1050 С. Tempering at 180 °C. Test temperature 100 C. 64  
Tempering at 1050 C. Tempering at 180 C. Test temperature 200 C. 64  
Tempering at 1050 C. Tempering 180 C. Test temperature 300 C. 61  
Tempering at 1050 C. Tempering 180 C. Test temperature 400 C. 59  
Tempering at 1050 C. Tempering 180 C. Test temperature 500 C. 56  

Physical properties of steel X12F1

Test temperature, °С 20 100 200 300 400 500 600 700 800 900
Electrical resistivity (p, nominal value — m) 640                  

Heat resistance, red resistance of X12F1 steel

Heat resistance

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