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Steel 20ХН2М (20ХНМ)

Description

Steel 20ХН2М (20ХНМ)

Steel 20ХН2М (20ХНМ): brand of steels and alloys. Below is the systematized information on the purpose, chemical composition, types of supplies, substitutes, temperature of critical points, physical, mechanical, technological and casting properties for the grade — Steel 20ХН2М (20ХНМ).

General information about steel 20ХН2М (20ХНМ)

Substitute brand
steel: 20HGR, 15HR, 20HNR, 25HGNR.
Delivery type
Long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 4543−71, GOST 7417−75, GOST 8559−75, GOST 8560−78. Polished bar and silver bar GOST 14955−77, GOST 4543−71. Strip GOST 103−76. Forgings and forged billets GOST 4543−71, GOST 1133−71. Pipes OST 14−21−77.
Application
Gears, axle shafts, satellites, cams, hinges and other parts.

Chemical composition of steel 20ХН2М (20ХНМ)

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.40−0.70
Copper (Cu), no more 0.30
Molybdenum (Mo) 0.20−0.30
Nickel (Ni) 1.60−2.00
Sulfur (S), no more 0.035
Carbon (C) 0.15−0.22
Phosphorus (P), no more 0.035
Chromium (Cr) 0.40−0.60

Mechanical properties of steel 20ХН2М (20ХНМ)

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Transverse samples. Hardening 860 ° C, malso. Exposure on vacation 2 h.
200 1210 1420 five 21 38
600 970 1010 12 42 52

Mechanical properties versus test temperature

Section, mm test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Transverse samples. Hardening 860 ° C, oil. Vacation 200 ° С, 2 h, air.
eleven 20 1210 1420 five 21 38
8 -40 1260 1470 4 21  
8 -70 1280 1480 4 21  
Transverse samples. Hardening 860 ° C, oil. Vacation 600 ° C, 2 h, air.
eleven 20 970 1010 12 42 52
8 -40 1010 1060 eleven 27  
8 -70 1030 1090 eleven 23  

Mechanical properties of the bar

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB HRC e
Hardening 860 ° C, oil. Hardening 780 ° С, oil. Vacation 200 ° C, water or oil.
fifteen 685 880 eleven 50 78    
Cementation 930−950 ° С, air. Hardening 810−830 ° С, oil. Vacation 180−200 ° C, air.
<30 930 1180 eleven 50 78 341 57−63
30−50 830 1080 ten 40 59 250−320 57−63

Technological properties of steel 20ХН2М (20ХНМ)

Forging temperature
Beginning 1200, end 800. For workpieces with a cross section of more than 60 mm, slow cooling.
Weldability
RDS with heating and subsequent heat treatment.
Tendency to release ability
not inclined
Flock sensitivity
sensitive

Temperature of critical points of steel 20ХН2М (20ХНМ)

Critical point ° C
Ac1 720
Ac3 825

Impact strength of steel 20ХН2М (20ХНМ)

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -40 -70
Workpieces with a cross section of 11 mm. Guenching 860 C, oil. Vacation at a temperature of 300 C, 2 hours. 75 50 37
Workpieces with a cross section of 11 mm. Guenching 860 C, oil. Vacation at a temperature of 400 C, 2 hours 87 63 54
Workpieces with a cross section of 11 mm. Guenching 860 C, oil. Vacation at a temperature of 500 C, 2 hours 158 84 63

Hardenability of steel 20ХН2М (20ХНМ)

Hardening 810 C. Hardness for strips of hardenability HRCe.

Distance from the end, mm / HRC e
4 6 12 eighteen 24 thirty 36 48
35.5−46.5 35−46.5 27−38.5 22−34 21−30 20.5−29.5 19.5−29.5 28
 

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