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4X5MFS steel

4X5MFS Steel

Steel 4X5MFS: 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 4Kh5MFS.

General information about 4X5MFS steel

Substitute for the brand
Steel grade: 4Х5МФ1С, 4Х4ВМФС.
Delivery type
Round 4h5mfs, sheet 4h5mfs, bars, 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. Forged and forged blanks GOST 5950−74, GOST 1133−71, GOST 7831−78.
Application
Small hammer dies, large (section greater than 200 mm) hammer and press inserts during hot deformation of structural steels and nonferrous alloys in terms of large-scale production, die casting molds of aluminum as well as zinc and magnesium alloys.

Chemical composition of 4X5MFS steel

Chemical element %
Vanadium (V) 0.30−0.50
Silicon (Si) 0.90−1.20
Manganese (Mn) 0.20−0.50
Copper (Cu), not more 0.30
Molybdenum (Mo) 1.20−1.50
Nickel (Ni), not more than 0.35
Sulfur (S), max. 0.030
Carbon (C) 0.32−0.40
Phosphorus (P), not more than 0.030
Chrome (Cr) 4.50−5.50

Mechanical properties of 4X5MFS steel

Mechanical properties depending on tempering temperature

t tempering temperature, °C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HRCe
Tempering at 1000 °C in oil. Tempering temperature 2 h.
500 1420 1720 12 45 49 50
550   1670 10 50 56 48
600 1350 1490 13 53 59 45
650 960 1080 15 60 79 34

Mechanical properties as a function of test temperature

t test temperature,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HRCe
Tempering at 1000 °C, oil. Tempering at 560 °C, 2 h.
20 1570 1710 12 54 51 50
300 1320 1540 12 48 61 50
400 1270 1470 12 49 62 52
500 1130 1370 10 52 55 47
550 1160 1290 12 50 50 44

Technological properties of 4X5MFS steel

Forging temperature
Beginning 1180, the end 850. Delayed cooling in the wells.

Steel 4Х5МФС critical point temperature

Critical point °С
Ac1 840
Ac3 870
Ar3 810
Ar1 735
Mn 300

Impact toughness of 4X5MFS steel

Impact toughness, KCU, J/cm2

Delivery condition, heat treatment +20 -40 -70
Hardening, tempering 600 C. 29 20 10

Steel hardness 4Х5МФС

Delivery condition, heat treatment regime HRCэ surface HB
Ruts and strips annealed or high-temperatured   241
Samples. Hardening 1000−1020 C, oil. Tempering 550 C. St. 48  
Heating at 700−750 С. Tempering at 1000−1020°C. Tempering 530−560 С. Tempering 500−520 С (final heat treatment mode) 49−51  

Physical properties of 4X5MFS steel

Temperature of test, °C 20 100 200 300 400 500 600 700 800 900
Steel density, pn, kg/m3 7750 7724 7697 7670 7641 7600 7573 7546 7520 7495
Thermal conductivity coefficient W/(m — °C) 29 30 30 31 33 31 30 28 26 27
Electrical resistivity (p, nominal value — m) 480                  

Heat resistance, red resistance of 4X5MFS steel

Heat resistance

Temperature, °C Time, h Hardness, HRCэ
590 2 47