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6HS steel

6CrNiNG Steel

Steel 6HS: 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 6ÕÑ.

General information on 6CrS steel

Type of delivery
Round 6ÕÑ, bar stock, 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 5950−73, GOST 4405−75. Forged and forged blanks GOST 5950−74, GOST 1133−71, GOST 7831−78.
Application
Pneumatic chisels and punches of small sizes for cold stamping, chopping knives.

Chemical composition of 6ХС steel

Chemical element %
Vanadium (V), not more than 0.15
Tungsten (W), not more 0.20
Silicon (Si) 0.60−1.00
Manganese (Mn) 0.15−0.40
Copper (Cu), not more than 0.30
Molybdenum (Mo), not more than 0.20
Nickel (Ni), not more than 0.35
Sulfur (S), not more than 0.030
Titanium (Ti), not more than 0.03
Carbon (C) 0.60−0.70
Phosphorus (P), not more than 0.03
Chromium (Cr) 1.00−1.30

Mechanical properties of 6Cr steel

Mechanical properties depending on tempering temperature

t tempering temperature, °C σ0.2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HRCe
Hardening at 880 °C in oil. Tempering temperature 2 h.
200 2060   2     59
300 1910 2080 3 20 24 56
400 1760 1910 4 25 20 52
500 1250 1400 8 30 39 45
600 980 1070 20   46  

Mechanical properties as a function of test temperature

t test temperature,°C σB, MPa δ5, % ψ, % HB
Hardening with oil. Tempering at 600−620°C.
100 760 11 45 249
200 800     240
300 800 13   230
400 660 16   190
500 500 18 48 150
600 330 19 62 130
700 225 22 71 100

Technological properties of 6HS steel

Forging temperature
Beginning 1170, end 850. Cooling in the lined pit or under a layer of sand.

Steel 6HS critical point temperature.

Critical point °С
Ac1 770
Ac3 830
Mn 250

Impact toughness of 6Cr steel

Impact toughness, KCU, J/cm2

Delivery condition, heat treatment +20 -20 -60
Hardening 840−860 C, oil. Tempering 250 C.   24 21
Tempering at 840−860 С, oil. Isothermal soaking at 250 C. 343 13 12

Steel hardness 6HS

Delivery condition, heat treatment regime HRCэ surface HB
Rings and strips annealed or high-temperatured   229
Samples. Hardened 840−860 C, oil. St 57  
Heating at 700−750 C. Tempering at 840−860 С, oil. Tempering 240−270 С, air (final heat treatment mode) 53−56