X6VF steel
Cr6VF steel
X6VF Steel: Handbook 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 grade — Steel X6VF.
General information on X6VF steel
| The substitute for the following steels |
| X12F1, X12M, 9X5 °F. |
| Kind of delivery |
| 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. Tape GOST 2283−79, GOST 23522−79. Tape GOST 4405−75. Forgings and forged blanks GOST 5950−74, GOST 1133−71, GOST 7831−78. |
| Application |
| Thread rolling tools (rollers and dies), hand hacksaw blades, razors, dies, punches, gear knives and other tools for cold rolling, for woodworking milling tools. |
Chemical composition of Х6ВФ steel
| Chemical element |
% |
| Vanadium (V) |
0.50−0.80 |
| Tungsten (W) |
1.10−1.50 |
| Silicon (Si) |
0.15−0.35 |
| Manganese (Mn) |
0.15−0.40 |
| Copper (Cu), not more than |
0.30 |
| Molybdenum (Mo), max. |
0.30 |
| Nickel (Ni), not more than |
0.35 |
| Sulfur (S), not more than |
0.030 |
| Carbon (C) |
1.05−1.15 |
| Phosphorus (P), not more than |
0.030 |
| Chromium (Cr) |
5.50−6.50 |
Process properties of Cr6VF steel
| Forging temperature |
| Beginning 1100, end 850. Slow cooling in wells or thermostats. |
| Weldability |
| Not applicable for welded structures. |
| Tendency to temperability |
| is not prone to |
| Grindability |
| At HRCe 57−59 — satisfactory; HRCe 59−61 — reduced; HRC 63−65 — low. |
Temperature of critical points of Х6ВФ steel
| Critical point |
°С |
| Ac1 |
815 |
| Ac3 |
845 |
| Ar3 |
755 |
| Ar1 |
625 |
| Mn |
150 |
Impact toughness of steel X6VF
Impact toughness, KCU, J/cm2
| Delivery condition, heat treatment |
KCU |
HRCe |
| Hardening at 1000 C in oil. Tempering at 200 °C, 1.5h. |
83 |
59 |
| Tempering at 1000 °C in oil. Tempering at 300 °C, 1.5 h. |
92 |
57 |
| Tempering at 1000 °C in oil. Tempering at 400 °C, 1.5 h. |
83 |
56 |
| Tempering at 1000 °C in oil. Tempering at 500 °C, 1.5 h. |
74 |
55 |
| Tempering at 1000 °C in oil. Tempering 550 C., 1.5 h. |
83 |
54 |
| Billet thickness or diameter up to 120 mm. Quenching at 990 C, oil or molten salts at 160 C. Tempering at 160 C. |
69−98 |
63−65 |
| Billet with thickness or diameter up to 120 mm. Quenching at 990 °C, oil or molten salts at 160 °C. Tempering 200 C. |
|
59−61 |
| Billet thickness or diameter up to 120 mm. Quenching at 990 C, oil or molten salts at 160 C. Tempering at 290 C. |
88−98 |
57−59 |
Hardness of Х6ВФ steel
| Delivery condition, heat treatment regime |
HRCe surface |
HB |
| Ruts and strips, annealed or high-temperatured |
|
241 |
| Samples. Quenched 980−1000 C, oil |
St. 62 |
|
| Annealing — heating at 30 deg/h to 840 °C, holding for 3 hours, cooling at 30 deg/h to 550 °C, further cooling at any rate |
|
187−228 |
| Isothermal annealing 830−850 C, cooling 50 deg/h to 700−720 C, 2−3 h, cooling 50 deg/h to 550 C, air. |
|
241 |
| Heating 650−700 C. Quenching at 980−1000 C, oil, alkali, saltpeter. Tempering at 150−170 C, 1.5 hours, air (final heat treatment mode). |
63−64 |
|
| Heating 650−700 С. Quenching at 980−1000°C, oil, alkali, saltpeter. Tempering 280−300 C, 1,5h, air (final heat treatment mode) |
57−59 |
|
| Tempering at 1000 C, tempering at 180 C. Test temperature 100 C. |
64 |
|
| Tempering at 1000 C, tempering at 180 C. Test temperature 200 C. |
64 |
|
| Tempering at 1000 C, tempering at 180 C. Test temperature 300 C. |
61 |
|
| Tempering at 1000 C, tempering at 180 C. Test temperature 400 C. |
59 |
|
| Tempering at 1000 C, tempering at 180 C. Test temperature 500 C. |
56 |
|
Hardenability of steel Х6ВФ
| Distance from end face, mm / HRCe |
| |
| |
| Heat treatment |
Crit. dia. in oil, mm |
Critical hardness, HRCe |
| Hardening at 1000−1050°C. |
80 |
63−64 |
| Hardening 950 C. |
|
59−61 |
Heat resistance, red resistance of steel Х6ВФ
Heat resistance
| Temperature, °С |
Time, h |
Hardness, HRCэ |
| 150−170 |
1 |
63 |
| 480−500 |
1 |
59 |
