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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