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Steel 25Kh2M1F

25X1MF 35CRM 20CR3MOVF 25X2M1F 38CR2MUA 30CRM 30CMA

Steel 25Kh2M1F

Steel 25Cr2M1F: a classifier 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 brand — Steel 25Kh2M1 °F.

General information on steel 25Kh2M1F

Delivery type
Round 25h2m1f, bars, including shaped: GOST 20072−74, GOST 2590−71, GOST 2591−71. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78. Strips GOST 103−76, GOST 4405−75. Forged and forged blanks GOST 1133−71, GOST 8479−70.
Application .
Fasteners operating at temperatures up to 535 ° C, flat springs, bolts, pins and other parts.

Chemical composition of steel 25Х2М1Ф

Chemical element %
Vanadium (V) 0.30−0.50
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.40−0.70
Copper (Cu), not more 0.20
Molybdenum (Mo) 0.90−1.10
Nickel (Ni), not more than 0.30
Sulfur (S), max. 0.025
Carbon (C) 0.22−0.29
Phosphorus (P), not more than 0.030
Chromium (Cr) 2.10−2.60

Mechanical properties of steel 25Kh2M1F

Heat treatment, delivery condition Section, mm σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HB
Rods. Normalization 1030−1050°C, air. Normalizing at 950−970°C, air. Tempering 680−720°C, air.
  90 670 780 12 50 49  
Normalization. Hardening. Tempering.
KP 490 100−300 490 655 13 40 54 212−248
KP 590 100−300 590 735 13 40 49 235−277
KP 685 <100 685 835 13 42 59 262−311
KP 685 100−300 685 835 12 35 49 262−311

Mechanical properties at elevated temperatures

t test,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Rods. Normalizing at 1030−1050°C, air. Tempering 650−660°C, 6 h, air. At 20 °C CV 285−302
20 780−1050 880−110 11−21 39−70 62
100 780−980 880−1010 13−18 38−60  
200 740−910 830−1010 12−14 51−62  
300 680−980 780−1080 12−17 48−60  
500 680−760 760−820 14−19 65−71 86
525 640−720 690−770 15−19 70−76 86
550 640−710 690−740 17 74 74
575 640−710 680−730 16−18 69−76 78
600 520−690 550−710 16−22 70−77 94
Sample diameter 6 mm, length 30 mm, forged. Strain rate 16 mm/minute. Strain rate 0.009 1/s
800 265 275 29 72  
850 255 265 35 86  
900 215 225 34 90  
950 125 140 40 93  
1000 83 93 60 92  
1100 53 61 61 81  
1200 32 37 55 84  
1250 27 28 58 100  

Mechanical properties depending on test temperature

Heat treatment, delivery condition t test,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
1030−1050 °C normalization, 650 °C tempering, 6 h.
Heat soaking at 550 °C, 3000 h. 20 840 960 15 54 65
Heat soak 550 °C, 3000 h. 550 610 640 14 59 84
Heat soak 550 °C, 6000 h. 20 810 910 13 54 63
Heat soak 550 °C, 6000 h. 550 580 600 15 60 126
Heat soak 575 °C, 3000 h. 20 720 850 14 58 66
Heat soak 575 °C, 3000 h. 550 530 580 15 66 127
Heat soak 575 °C, 6000 h. 20 570 700 18 66 111
Heat soak 575 °C, 6000 h. 550 450 500 17 69 167

Technological properties of steel 25Kh2M1F

Forging temperature
Beginning 1200, the end 800.
Weldability
Not applicable for welded structures.
Workability by cutting
In normalized and tempered condition at NV? 300 and σB = 1030 MPa K υ of fused steel. = 0.25, Kυ b.st. = 0.60.

Temperature of critical points of 25Cr2Mo1 °F steel

Critical point °С
Ac1 780
Ac3 870
Ar3 790
Ar1 700

Impact toughness of steel 25Х2М1Ф

Impact toughness, KCU, J/cm2

Delivery condition, heat treatment +20 -20 -40 -60
Normalization 1030−1050 C, normalization 950−970 C, tempering 650−660 C, 6 h, air. 98−225 88−137 69−137 59−108

Endurance limit of steel 25Х2М1Ф

σ-1, MPa n σB, MPa σ0, 2, MPa Heat treatment, state of steel
461 1Е+7 1080 980 Normalizing at 1040 C. Tempering 650 C, 6 h, air.

Heat resistance of steel 25Х2М1Ф

Medium Temperature, °С Test duration, h Depth, mm/year
Steam 550 500 0,18
Steam 550 300 0,25
Steam 550 100 0,51

Physical properties of steel 25Kh2M1F

Test temperature,°C 20 100 200 300 400 500 600 700 800 900
Modulus of normal elasticity, E, GPa 217 211 205 200 193 186 174      
Torsional shear modulus of elasticity G, GPa 82 79 72 74 71 66 57      
Steel density, pn, kg/m3 7800 7780 7750 7720 7680 7650 7600      
Thermal conductivity coefficient W/(m — °C)   33 32 30 29 28        
Electrical resistivity (p, nominal value — m) 270 360 420 500 590 710 840 970    
Test temperature,°C 20−100 20−200 20−300 20−400 20−500 20−600 20−700 20−800 20−900 20−1000
Coefficient of linear expansion (a, 10−6 1/°C) 12.5 12.9 13.3 13.7 14.0 14.7        
Specific heat capacity (C, J/(kg -°C)) 538 575 609 634 676 735