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4CrMoFS steel

R6M5K5 Р18 R9M4K8 Р9 45CRNIM 60XH 75CSMF 9Х2 55Х 60CSMF 7X2CMF 9X2MF 60CR2SMF 75CRM 90XMF 60XG 75CRMOV 90XF CB4F 9XVG. CVG 9HS 9Х1 У10 У12 У7 U10A U12A U7A У8 U8A U9A У9 27Х2Н2М1Ф 4X5MFS 6XV2C 7XG2VMF Х12 X12MF 40X5MF 4XV2C 5CHEV2C 6CVG X12VM X12F1 3CR2V8F 4CMFS 5CGM 6HS 8Х3 X6VF. 3Х2Н2МВФ 4Х2НМФ 4X5MF1S 5CRNIM 7Х3

4CrMoFS Steel

4CrMFS Steel: 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 4KhMFS.

General information on 4KhMFS 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. Forged and forged blanks GOST 5950−74, GOST 1133−71, GOST 7831−78.
Application
Hammer dies of steam and pneumatic hammers with weight of the falling parts up to 3 tons at deformation of alloyed structural and stainless steels, pressing tools for treatment of aluminum alloys, inserts and punches for upsetting on horizontal forging machines.

Chemical composition of 4CrMoFS steel

Chemical element %
Vanadium (V) 0.30−0.50
Silicon (Si) 0.50−0.80
Manganese (Mn) 0.50−0.80
Copper (Cu), not more 0.30
Molybdenum (Mo) 0.90−1.20
Nickel (Ni), not more than 0.35
Sulfur (S), max. 0.030
Carbon (C) 0.37−0.45
Phosphorus (P), not more than 0.030
Chromium (Cr) 1.50−1.80

Mechanical properties of 4CrMoFS steel

Mechanical properties depending on tempering temperature

t tempering temperature, °C σ0.2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HRCe
Hardening 920 °C, oil Tempering temperature 2 h.
300 1570 2060 10 41 29 51
400 1370 1660 11 38 29 49
500 1340 1610 12 47 39 47
600 1180 1260 14 53 78 42
650 820 880 22 63 157 30

Mechanical properties as a function of test temperature

t test temperature,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Quenching at 920 °C in oil. Tempering at 560 °C, 2 h.
300 1250 1390 11 44 44
400 1180   12 49 49
500 1180 1270 13 55  
600 950 1070 14 63 53
Stamping section up to 500 mm. Hardening 950 °C, oil. Tempering 550°C
10 1280 1450 7 20 20
300 1190 1340 8 27 54
600 760 900 10 45 59

Technological properties of 4XMFS steel

Forging temperature
Beginning 1150, the end 850. Delayed cooling in the wells.

Steel 4CrMoFS critical point temperature

Critical point °С
Ac1 760
Ac3 805
Ar3 710
Ar1 630
Mn 280

Steel hardness 4KhMFS

Delivery condition, heat treatment regime HRCэ surface HB
Rings and strips annealed or high-temperatured   241
Samples. Quenched 920−930 C, oil. 56  
Heating at 700−750 C. Hardening 910−930 C, oil. Tempering 580−620 C. Tempering 550−580 C. (Final heat treatment mode). 45−48  
Tempering 700−750 С. Tempering 910−930 C, oil. Tempering 630−660 C. Tempering 580−600 C (final heat treatment) 40−44  
Tempering at 910−930°C. Tempering 580−600 C (for hammer dies, section up to 300 mm) 42−47  
Quenching at 910−930°C. Tempering at 600−620°C (for hammer dies with a cross-sectional area over 300mm) 40−43  
920−950°C hardening. Tempering at 530−550°C (for presses, section up to 300mm) 47−49  
Quenching at 920−950°C. Tempering at 580−600°C (for presses, section over 300mm) 44−46  

Heat resistance, red resistance of steel 4XMFS

Heat resistance

Temperature, °С Time, h Hardness, HRCэ
650 4 42