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Steel 8X3

8Cr3 Steel

Steel 8X3: 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 8X3.

General information on 8X3 steel

Substitute for the brand
steel 7Х3.
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 5950−73, GOST 4405−75. Forged and forged blanks GOST 5950−74, GOST 1133−71, GOST 7831−78.
Application
The tool (punches, dies) hot upsetting the fastener and blanks of carbon and low-alloy constructional steels on the horizontal forging machines, parts of punches (dies. punches, ejectors) for hot pressing and extrusion, bending, trimming and punching dies.

Chemical composition of steel 8X3

Chemical element %
Vanadium (V), not more 0.15
Tungsten (W), not more 0.20
Silicon (Si) 0.15−0.35
Manganese (Mn) 0.15−0.40
Copper (Cu), not more 0.30
Molybdenum (Mo), max. 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) 0.75−0.85
Phosphorus (P), not more than 0.030
Chrome (Cr) 3.20−3.80

Mechanical properties of steel 8X3

Mechanical properties

Heat treatment, delivery condition σ0.2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HRCe
Annealing at 650−700°C. Tempering at 820−850°C, oil. Tempering 480−550°C. 1420−1520 1470−1570 6−9 18−20 20−24 44−48

Mechanical properties depending on tempering temperature

t tempering temperature, °C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HRCe
Tempering at 870 °C, oil, tempering time 2 h.
300 1800 1980 3   20 55
400 1630 1710 6 10 23 52
500 1270 1340 8 25 34 44

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 500 °C, 2 h.
200 1080 1270 8 27 46
300 1030 1220 10 28 54
400 930 1110 15 47 49
500 640 800 20 65 44

Technological properties of 8X3 steel

Forging temperature
Beginning 1160, the end 800. Slow cooling in the wells.

Steel 8X3 critical point temperature

Critical point °С
Ac1 785
Ac3 830
Ar3 770
Ar1 750
Mn 370