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Steel 40Х10С2М

40Cr10Cr2M Steel

Steel 40Kh10S2M: 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 brand — Steel 40X10C2M.

General information on steel 40Kh10S2M

Delivery type
Bar stock, including shaped: GOST 5949−75, GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 18907−73. Calibrated rod GOST 7417−75, GOST 8559−75, GOST 8560−78. Grinded rod and silver GOST 14955−77, GOST 18907−73. Strip GOST 4405−75, GOST 103−75. Forged and forged blanks GOST 1133−71.
Application
Valves of aircraft engines, automotive and tractor diesel engines, engine mounting parts. Steel is heat-resistant and heat-resistant martensitic class has high mechanical properties up to 600 ° C, but at a long exposure at 500 ° C and especially at 600 ° C, impact toughness drops sharply to 150 kJ/m2.

Chemical composition of steel 40X10C2M

Chemical element %
Silicon (Si) 1.9−2.6
Manganese (Mn), not more 0.8
Copper (Cu), not more than 0.30
Molybdenum (Mo) 0.7−0.9
Nickel (Ni), not more than 0.6
Sulfur (S), max. 0.025
Titanium (Ti), not more than 0.2
Carbon (C) 0.35−0.45
Phosphorus (P), not more than 0.030
Chrome (Cr) 9.0−10.5

Mechanical properties of steel 40Х10С2М

Mechanical properties at elevated temperatures

t test,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Hardening at 1100 °C, oil. Tempering at 800 °C, water.
20 670 940 19 41 29
100 570 840 14 26  
200 510 820 18 39 69
300 520 830 15 36 81
400 480 760 13 24 85
500 455 660 21 41 87
600 370 430 30 71 113
700 200 220 41 92  
Hardening 1010−1050 °C, oil. Tempering at 750 °C, oil (short-term tests)
20   930 10 35  
600   390 18 85  
700   160 27 96  
800   59 30 98  
900   34 48 98  

Mechanical properties depending on tempering temperature

t tempering temperature, °C σB, MPa δ5, % ψ, % KCU, J/m2 HB
Hardening 950−1050°C.
200 1780 3 8 39 555
300   12 20   540
400         570
500         545
600 1400 22 68   400
700 850 50   58 250

Mechanical properties of the bar

Heat treatment, delivery condition Section, mm σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Rods. Tempering at 1010−1050°C, air or oil. Tempering 720−780°C, oil. 60 735 930 10 35 20

Mechanical properties depending on heat treatment

Heat treatment, delivery condition σ0.2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Heat soaking at 500 °C, 1000 h 670 930 16 33 17
Tempering at 1100 °C, oil. Heat soak 500 °C, 3000 h. 660 900 17 42 29
Tempering 800 °C, 3 h, water. Heat soaking 500 °C, 5000 h. 670 910 14 25 16

Technological properties of 40Х10С2М steel

Forging temperature
Beginning temperature 1200, ending temperature 850. Sections up to 350 mm are cooled in the pits.
Weldability
Difficult-to-weld. Welding method RDS, heating and subsequent heat treatment is necessary.
Tendency to temper.
is not prone to
Flocculation sensitivity
is not sensitive

Steel 40Х10С2М critical point temperature

Critical point °С
Ac1 810
Ac3 950
Ar3 845
Ar1 700

Physical properties of steel 40Х10С2М

Test temperature,°C 20 100 200 300 400 500 600 700 800 900
Modulus of normal elasticity, E, GPa 214 211 205 202 196 187 172 151 129  
Steel density, pn, kg/m3 7620 7610             7430  
Thermal conductivity coefficient W/(m — °C) 17 18 20 22 22 24 25 26    
Electrical resistivity (p, nominal value — m)   906 958 1010 1062 1114 1166 1216    
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) 10.0 11.0 11.0 11.0       11.0    
Specific heat capacity (C, J/(kg -°C))       532 561 586