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Steel 40ХН

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Description

Steel 40ХН

Steel 40ХН: 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 40XN.

General information about steel 40ХН

Substitute brand
Steel: 45ХН, 50ХН, 38ХГН, 40Х, 35ХГФ, 40ХНР, 40ХНМ, 30ХГВТ.
Delivery type
Circle 40xn, pipe 40xn, long products, including shaped: GOST 4543−71, GOST 259071, GOST 2591−71, GOST 2879−69, GOST 10702−78. Calibrated bar GOST 7417−75, GOST 8560−78, GOST 10702−78, GOST 4543−71. Polished bar and silver bar GOST 4543−71, GOST 14955−77. Thick sheet TU 14−1-1930−77. Strip GOST 103−76. Forgings and forged billets GOST 1133−71, GOST 8479−70, GOST 4543−71. Rolls OST 24.013.21−85. Pipes OST 14−21−77.
Application
Circle 40xn, axles, shafts, connecting rods, gear wheels, excavator shafts, couplings, pinion shafts, spindles, bolts, levers, rods, cylinders and other critical loaded parts subjected to vibration and dynamic loads, which are subject to increased strength and toughness requirements… Rolls of rail and structural steel mills for hot rolling of metal.

Chemical composition of steel 40ХН

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.50−0.80
Copper (Cu), no more 0.30
Nickel (Ni) 1.00−1.40
Sulfur (S), no more 0.035
Carbon (C) 0.36−0.44
Phosphorus (P), no more 0.035
Chromium (Cr) 0.45−0.75

Mechanical properties of steel 40ХН

Mechanical properties

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Bar. Hardening 820 ° C, water or oil. Vacation 500 ° C, water or oil.
  25 785 980 eleven 45 69  
Forgings. Normalization
KP 315 100−300 315 570 fourteen 35 34 167−207
KP 315 300−500 315 570 12 thirty 29 167−207
KP 315 500−800 315 570 eleven thirty 29 167−207
Forgings. Hardening. Vacation.
KP 345 300−500 345 590 fourteen 38 49 174−217
KP 395 <100 395 615 17 45 59 187−229
KP 395 100−300 395 615 fifteen 40 54 187−229
KP 395 300−500 395 615 thirteen 35 49 187−229
KP 395 500−800 395 615 eleven thirty 39 187−229
KP 440 <100 440 635 sixteen 45 59 197−235
KP 440 100−300 440 635 fourteen 40 54 197−235
KP 440 300−500 440 635 thirteen 35 49 197−235
KP 440 500−800 440 635 eleven thirty 39 197−235
KP 490 <100 490 655 sixteen 45 59 212−248
KP 490 100−300 490 655 thirteen 40 54 212−248
KP 540 <100 540 685 fifteen 45 59 223−262
KP 540 100−300 540 685 thirteen 40 49 223−262
KP 590 <100 590 735 fourteen 45 59 235−277
KP 590 100−300 590 735 thirteen 40 49 235−277

Mechanical properties at elevated temperatures

test t, ° C σ B, MPa δ 5 ,% ψ,%
Normalization at 850 ° C.
20 790 eighteen 48
200 750   50
300 690 20  
400 540 25 65
500 480 25 79
600 350 27 85
Sample 6 mm in diameter, 30 mm long, forged and normalized. The deformation rate is 50 mm / min, the deformation rate is 0.03 1 / s.
700 225 36 92
800 130 57 96
900 91 71 100
1000 62 75 100
1100 45 76 100
1200 31   100

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Hardening 820 ° С, oil.
400 1220 1370 ten 41 32 387
500 1080 1160 fourteen 51 46 302
600 760 910 20 60 83 241

Mechanical properties depending on the section

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% HB
Normalization 870−925 ° С, hardening 790 ° С, oil. Vacation 540 ° C.
40 780 960 eighteen 58 325
80 730 920 20 54 302
120 710 910   50 300

Technological properties of steel 40ХН

Forging temperature
Beginning 1250, end 830. Sections up to 50 mm are cooled in air, 50−200 mm — in a mold, 201−300 mm — with a furnace.
Weldability
difficult to weld. RDS, submerged-arc ADS, EShS. Heating and subsequent heat treatment are required.
Machinability by cutting
In the hot-rolled state at HB 166−170 and σ B = 690 MPa K υ tv.spl. = 1.0, K υ b.st. = 0.9.
Tendency to release ability
inclined
Flock sensitivity
hypersensitive

Temperature of critical points of steel 40ХН

Critical point ° C
Ac1 735
Ac3 768
Ar3 700
Ar1 660
Mn 305

Impact strength of steel 40ХН

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -20 -40 -60
Forging 200X30 mm. Hardening. Vacation. 116 116 93 80

Endurance limit of steel 40ХН

σ -1, MPa τ -1, MPa n σ B, MPa σ 0.2, MPa Heat treatment, steel condition
490 294   980 780 HB 300−320
441 274   880 690 HB 270−300
392 235   780 570 HB 200−240
314−392   1E + 7   790 Normalization. HB 197.

Hardenability of steel 40ХН

Hardness HRCэ.

Distance from the end, mm / HRC e
1.5 3 4.5 6 nine 12 fifteen 21 27 33
52.5−58.5 51.5−58.0 49.5−57 48−56 41.5−54.5 35.5−49 32.5−43.5 28−37.5 26.5−33.5 26−31.5
Amount of martensite,% Crit. Diam. in water, mm Crit. Diam. in oil, mm Crete. hardness, HRCэ
50 60−112 37−76 44−47
90 40−89 18−56 50−53

Physical properties of steel 40ХН

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 200                  
Density of steel, pn, kg / m 3 7820 7800 7710 7840 7700          
Thermal conductivity coefficient W / (m ° С)   44 43 41 39 37        
Test temperature, ° С 20−100 20−200 20−300 20−400 20−500 20−600 20−700 20−800 20−900 20−1000
Linear expansion coefficient (a, 10−6 1 / ° С) 11.8 12.3 13.4 14.0            

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