3X2V8F steel
3Cr2V8 °F Steel
Steel 3Cr2V8F: grade 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 grade — Steel 3X2V8 °F.
General information about 3X2V8 °F steel
| Steel substitute for the following grades |
| Steel grades: 4Х5В2ФС, 4Х2В2МФС, 5Х3В3МФС. |
| Delivery type |
| Forging 3х2v8f, circle 3х2v8f, strip 3х2v8f, bars, 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. Forgings and forged blanks GOST 5950−74, GOST 1133−71, GOST 7831−78. |
| Application |
| Heavy-duty press tools (small final punch inserts, dies and punches for punching, etc.) for hot deformation of alloyed structural steels and heat-resistant alloys, die-casting molds of copper alloys. |
Chemical composition of steel 3Х2В8Ф
| Chemical element |
% |
| Vanadium (V) |
0.20−0.50 |
| Tungsten (W) |
7.50−8.50 |
| Silicon (Si) |
0.15−0.40 |
| Manganese (Mn) |
0.15−0.40 |
| Copper (Cu), not more than |
0.030 |
| Molybdenum (Mo), max. |
0.50 |
| Nickel (Ni), not more than |
0.35 |
| Sulfur (S), not more than |
0.030 |
| Carbon (C) |
0.30−0.40 |
| Phosphorus (P), not more than |
0.030 |
| Chromium (Cr) |
2.20−2.70 |
Mechanical properties of 3Cr2V8 °F steel
Mechanical properties depending on tempering temperature
| t tempering temperature, °C |
σ0.2, MPa |
σB, MPa |
δ5, % |
ψ, % |
KCU, J/m2 |
HRCe |
| Tempering at 1130 °C, oil. Tempering temperature 2 h. |
| 600 |
|
1720 |
10 |
41 |
20 |
52 |
| 625 |
1460 |
1640 |
7 |
28 |
25 |
50 |
| 650 |
1390 |
1530 |
12 |
36 |
20 |
48 |
| 675 |
1310 |
1430 |
10 |
36 |
25 |
45 |
Technological properties of steel 3Х2В8Ф
| Forging temperature |
| Beginning 1200, the end 900. Cooling to 750 C in the air, then in the sand. |
| Weldability |
| Not applicable for welded structures. |
| The machinability by cutting |
| At HB 200−220 and σB = 710 MPa Kυ of solid steel. = 0.9, K υ b.st. = 0.45. |
| The tempering capacity |
| inclined |
| Flocke sensitivity |
| sensitive |
Temperature of critical points of 3Cr2V8 °F steel
| Critical point |
°С |
| Ac1 |
800 |
| Ac3 |
850 |
| Ar3 |
750 |
| Ar1 |
690 |
| Mn |
380 |
Steel hardness 3Х2В8Ф
| Delivery condition, heat treatment regime |
HRCe surface |
HB |
HV |
| Rings and strips annealed or high-temperatured |
|
241 |
|
| Samples. Hardened 1075−1125 C, oil |
St. 49 |
|
|
| Heating at 840−860 С. Hardening 1120−1160 C, oil. Tempering 660−680 C, air (treatment for increased heat resistance) |
40−45 |
|
|
| Tempering at 840−860 С. Tempering 1070−1100 C, oil. Tempering 620−650 C, air. Processing for increased strength and tempering resistance. |
42−45 |
|
|
| Section up to 400 mm. Tempering at 1080−1100 C, oil or air. Tempering 580−590 C, cooling with furnace. Tempering 540−550 C, cooling with furnace |
|
402−475 |
|
| Tempering 700−750 С. Tempering 1130−1150 C, oil. Tempering 640−660 C. Tempering 600−620 C. |
44−48 |
|
|
| Tempering at 1150 C. Tempering 620 C. Nitriding 530 C. Ammonia dissociation degree 25−30%, 3h, layer thickness 0.07−0.08 mm. |
|
|
1000−1080 |
| Hardening 1150 С. Tempering 620 C. Nitriding 530 C. Ammonia dissociation degree 25−30%, 6 h, layer thickness 0,10−0,12 mm. |
|
|
1100−1600 |
| Hardening 1140 С. Tempering 650 C. Test temperature 400 C. |
47 |
|
|
| Tempering 1140 C. Tempering 650 C. Test temperature 500 C. |
43 |
|
|
| Hardening 1140 C. Tempering 650 C. Test temperature 550 C. |
41 |
|
|
| Hardening 1140 C. Tempering 650 C. Test temperature 600 C. |
33 |
|
|
| Tempering 1140 C. Tempering temperature 650 C. Test temperature 650 C. |
28 |
|
|
| Tempering at 1140 C. Tempering 650 C. Test temperature 700 C. |
22 |
|
|
Heat resistance of steel 3Х2В8Ф
| Medium |
Temperature, °C |
Test duration, h |
Depth, mm/year |
Resistance group or grade |
| Air |
500 |
4 |
0,0705 |
3 |
| Air |
600 |
1 |
0,193 |
6 |
Physical properties of 3Cr2V8 °F steel
| Test temperature,°C |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| Modulus of normal elasticity, E, GPa |
224 |
218 |
211 |
204 |
196 |
187 |
177 |
|
|
|
| Thermal conductivity coefficient W/(m — °C) |
|
25 |
27 |
29 |
40 |
46 |
50 |
|
|
|
| Electrical resistivity (p, nominal value — m) |
|
250 |
200 |
170 |
140 |
120 |
|
|
|
|
Heat resistance, red resistance of steel 3Х2В8Ф
Heat resistance
| Temperature, °C |
Time, h |
Hardness, HRCэ |
| 630−650 |
3 |
45−51 |
