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6XVG steel

6XVG steel

Steel 6KhVG: Handbook 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 6KhVG.

General information on 6XVG steel

Type of delivery
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
Complex shaped punches for cold piercing predominantly shaped holes in sheet and strip material, small dies for hot stamping, mainly when minimum dimensional change during quenching is required.

Chemical Composition of 6XVG Steel

Chemical element %
Tungsten (W) 0.50−0.80
Silicon (Si) 0.15−0.35
Manganese (Mn) 0.90−1.20
Copper (Cu), not more than 0.30
Molybdenum (Mo), not more than 0.30
Nickel (Ni), not more than 0.35
Sulfur (S), not more than 0.030
Carbon (C) 0.55−0.70
Phosphorus (P), not more than 0.030
Chromium (Cr) 0.50−0.80

Mechanical properties of 6XVG steel

Mechanical properties depending on tempering temperature

t tempering temperature, °C σ0.2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HRCe
Hardening at 870 °C in oil. Tempering temperature 2 h.
200 1820 1852 2 3 26 56
300 1700 2009 1 5 14 55
400 1470 1690 7 26 20 51
450 1450 1570 10 38 46 46
500 1270 1390 10 30 30 40
550 1180 1270 11 20 40 34

Mechanical properties as a function of test temperature

t test temperature,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Hardening at 870 °C in oil. Tempering at 450 °C, 2 h.
200 1240 1460 10 40 51
300 1180 1440 14 49 46
400 1100 1390 11 55 41
500 810 880 15 72 44

Technological properties of 6XVG steel

Forging temperature
Beginning 1160, the end 850. Slow cooling in the wells.

Temperature of 6XVG steel critical points

Critical point °С
Ac1 780
Ac3 795
Ar3 695
Ar1 675
Mn 280

6XVG steel hardness

Delivery condition, heat treatment regime HRCe surface HB
Rings and strips annealed or high-temperatured   217
Samples. Hardened 850−900 C, oil. St. 58  
Annealing 800−820 C, cooling 50 deg/h to 600 C, air   217
Tempering 700−750 C. Tempering 860−900 C, oil. Tempering 200−250 C, air 54−57  
Heating at 700−750°C. Tempering at 860−900 C, oil. Tempering 450−480 C, air 46−49