7ХГ2ВМФ steel
7ХГ2ВМФ steel
7KhG2VMF steel: steel and alloys classifier. 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 7ХГ2ВМФ.
General information about 7ХГ2ВМФ steel
| Delivery type |
| 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. Forgings and forged blanks GOST 5950−74, GOST 1133−71, GOST 7831−78. |
| Application |
| Volumetric cold deformation dies and punching tools of a complex configuration used in the manufacture of products from non-ferrous alloys and low-strength structural steel. |
Chemical composition of 7ХГ2ВМФ steel
| Chemical element |
% |
| Vanadium (V) |
0.10−0.25 |
| Tungsten (W) |
0.55−0.90 |
| Silicon (Si) |
0.20−0.40 |
| Manganese (Mn) |
1.80−2.30 |
| Copper (Cu), not more than |
0.30 |
| Molybdenum (Mo) |
0.50−0.80 |
| Nickel (Ni), not more than |
0.35 |
| Sulfur (S), not more than |
0.030 |
| Carbon (C) |
0.68−0.76 |
| Phosphorus (P), not more than |
0.030 |
| Chromium (Cr) |
1.50−1.80 |
Mechanical properties of 7ХГ2ВМФ steel
Mechanical properties
| Heat treatment, delivery condition |
KCU, J/m2 |
HB |
HRCe |
| Annealed or high-tempered bars and strips |
|
<255 |
|
| Samples. Hardened at 840−880°C, air. |
|
|
>59 |
| Heating at 650−700°C. Tempering at 850−860°C, oil. Tempering at 140−160°C, 1.5h, air (final heat treatment) |
118−147 |
|
60−61 |
| Tempering at 650−700°C. Tempering at 850−860°C, air. Tempering 200 °C, 1.5h, air. |
137−157 |
|
58−59 |
| Tempering at 850 °C. Tempering at 200 °C, nitriding at 530 °C (ammonia dissociation rate 25−30%) 3 h, nitrided layer depth 0.07−0.08 mm |
|
|
HV 660−730 |
| Hardening at 850 °C. Tempering at 200 °C, nitriding at 530 °C (ammonia dissociation rate 25−30%) for 3 hours, nitrided layer depth 0.13−0.15 mm |
|
|
HV 1070−1100 |
Mechanical properties depending on the cross section
| Section, mm |
KCU, J/m2 |
HRCe |
| Quenching for fine grain. Tempering 150−160°C (sample location ½R) |
| 15 |
50 |
61 |
| 25 |
45 |
61 |
| 50 |
40 |
60 |
| 100 |
36 |
60 |
Technological properties of 7ХГ2ВМФ steel
| Forging temperature |
| Beginning 1160, the end 800. Slow cooling in the wells. |
Temperature of 7ХГ2ВМФ steel critical points
| Critical point |
°С |
| Ac1 |
765 |
| Ac3 |
825 |
| Ar3 |
430 |
| Ar1 |
310 |
| Mn |
160 |
Impact toughness of 7ХГ2ВМФ steel
Impact toughness, KCU, J/cm2
| Delivery condition, heat treatment |
KCU |
| Forging. Hardening on a fine grain (samples section of 25 mm). Tempering at 150 C |
59 |
| Forging. Quenching on the fine grain (samples with a section of 25 mm). Tempering 250 C |
78 |
| Forging. Quenching on the fine grain (samples of section of 25 mm). Tempering 300 C |
59 |
| Forging. Quenching on the fine grain (samples of section of 25 mm). Tempering 350 C |
59 |
| Forging. Quenching on the fine grain (samples with a section of 25 mm). Tempering 400 C |
157 |
Steel hardness 7ХГ2ВМФ
| Delivery condition, heat treatment regime |
HRCe surface |
| Hardening 850 C, air. Tempering at 150 °C. |
62 |
| Tempering 850 C, air. Tempering at 200° C. |
61 |
| Hardening 850 C, air. Tempering 250 C. |
59 |
| Hardening 850 °C, air. Tempering 300 C. |
58 |
| Tempering at 850 °C, air. Tempering 350 C. |
56 |
Endurance limit of 7XG2VMF steel
| σ-1, MPa |
n |
Heat treatment, steel condition |
| 700 |
1Е+6 |
HB 470 |
| 750 |
1Е+7 |
HB 530 |
