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Steel 40X15H7G7F2MS

X27YU5T CRN70VMTUF CHN78T CRN70VMYUT CHN80TBU CRN35VT CHN70U CRN35VTU CHN77TUR 20X23H18 31Х19Н9МВБТ 40Х13 20Х13 20X25H20C2 40Х15Н7Г7Ф2МС 10X23H18 12Х25Н16Г7АР 15X12VNMF 20Х20Н14С2 37X12H8G8MFB 40X9C2 20X23H13 30Х13 40CR10CR2M 45Х14Н14В2М 13Х11Н2В2МФ

40Х15Н7Г7Ф2МС steel

40Cr15N7H7F2MS steel: a classifier 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 40Cr15N7G7F2MS.

General information about the steel 40Х15Н7Г7Ф2МС

Delivery type
Bar stock, including shaped: GOST 5949−75, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78. Grinded rod and silversilver GOST 14955−77. Strip GOST 4405−75, GOST 103−76. Forged and forged blanks GOST 1133−71.
Application
Fasteners operating at 650 ° C. Steel is alloyed, of the outtense class, heat-resistant, dispersion-hardening.

Chemical composition of steel 40Х15Н7Г7Ф2МС

Chemical element %
Vanadium (V) 1.5−1.9
Tungsten (W), not more 0.2
Silicon (Si) 0.9−1.4
Manganese (Mn) 6.0−8.0
Copper (Cu), not more than 0.30
Molybdenum (Mo) 0.65−0.95
Nickel (Ni) 6.0−8.0
Sulfur (S), max. 0.020
Carbon (C) 0.38−0.47
Phosphorus (P), not more than 0.035
Chrome (Cr) 14.0−16.0

Mechanical properties of 40X15N7H7F2MS steel

Mechanical properties at elevated temperatures

t test,°C σ0, 2, MPa σB, MPa δ5, % ψ, %
Heating at 1170−1190°C with water or air. Aging at 800 °C, 8−10 h, air.
20 600 1000 15 15
300 550 810 13 26
400 540 780 12 23
500   700 12 23
600 500 640 9 23
700 430 520 8 32
800 280 380 8 17
900   250 7 18
1000   160 6 21
Heating at 1180 °C, holding for 1 hour in water. Heating at 1000 °C, holding for 1 h, air.
20 480 940 30 28
600 360 640 16 24

Mechanical properties of the bar

Heat treatment, delivery condition Section, mm σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
1170−1190°C hardening, water or air. Aging at 780−820°C. 8−10 hrs. ageing, air. 60 590 880 15 15 29

Mechanical properties at 20 °C, depending on heat treatment

Heat treatment, delivery condition σ0.2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
1180 °C, 1 h, water hardening. Heating at 1000 °C, 1 h, air.
Heat soaking at 700 °C, 100°C 510 930 22 18 24
Heat soaking 700 °C, 500 °C 490 880 19 17 20
Heat soaking 700 °C, 2000 °C 470 810 18 15 20

Mechanical properties in the long term strength test

Creep strength, MPa Creep rate, %/h t test,°C Ultimate long-term strength, MPa Test duration, h t test, h
240 0.2/100 500 320 1000 600
230 0.2/100 600 180 1000 700
155 0.2/100 700 84 1000 800
80 0.2/100 800 250 10000 600
130 0.2/100 650 110 10000 700
120 0.2/1000 650 50 10000 800
80 0.2/10000 650 >137 75 800

Technological properties of 40X15N7H7F2MS steel

Forging temperature
Beginning 1160, end 1000.

Endurance limit of steel 40Х15Н7Г7Ф2МС

σ-1, MPa n σB, MPa σ0, 2, MPa Heat treatment, state of steel
510 1Е+7 1000 600 after heat treatment — heating at 1170−1190 C, water or air; aging at 800 C, 8−10 h, air.

Physical properties of steel 40Х15Н7Г7Ф2МС

Test temperature, °С 20 100 200 300 400 500 600 700 800 900
Modulus of normal elasticity, E, GPa 185   187 157 147 147 147 118 118  
Steel density, pn, kg/m3 7800 7770 7720 7680 7630 7580 7530      
Thermal conductivity coefficient W/(m — °C)   14 16 18 20 22 24 26    
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) 17.0 17.7 18.4 19.1 20.5 20.8