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Steel 30ХН3А

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Description

Steel 30ХН3А

Steel 30ХН3А: 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 30XN3A.

General information about steel 30ХН3А

Substitute brand
steel: 30Х2ГН2, 25Х2ГНТА, 34ХН2М.
Delivery type
Long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78. Polished bar and silver bar GOST 14955−77. Strip GOST 103−76. Forgings and forged billets GOST 1133−71. Pipes OST 14−21−77.
Application
Rims of driven wheels of traction gears of electric trains, gears and other improved parts. It can be used at a temperature of -80 ° C (wall thickness no more than 100 mm).

Chemical composition of steel 30ХН3А

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.30−0.60
Copper (Cu), no more 0.30
Nickel (Ni) 2.75−3.15
Sulfur (S), no more 0.025
Carbon (C) 0.27−0.33
Phosphorus (P), no more 0.025
Chromium (Cr) 0.60−0.90

Mechanical properties of steel 30ХН3А

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HRC e
Hardening 820 ° С, oil.
200 1460 1620 8 50 80 52
300 1400 1530 7 50 59 50
350 1290 1430 8 50 47 48
400 1180 1290 ten 52 54 45
500 920 1070 17 60 107 38
600 780 890 21 64 157 33

Mechanical properties depending on the section

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Hardening 820 ° С, oil. Vacation 580−600 ° С, air.
20 830 930 20 66 147 390
40 810 910 20 65 147 380
60 780 880 20 62 142 370
80 730 850 20 61 132 360

Mechanical properties of the bar

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HRC e
Hardening 820 ° С, oil. Vacation 530 ° C, water or oil. 25 785 980 ten 50 78  
Hardening 850 ° С, oil. five 1420 1670 thirteen 50 66 50
Vacation 200 ° C, air. 20 1370 1670 12 45 49 49

Mechanical properties depending on from temp. trials and vacations

test t, ° C vacation t, ° С σ 0.2, MPa σ B, MPa δ 5 ,% ψ,%
Hardening 820 ° С, oil.
300 20 1390 1540 8 56
300 250   1460 12 57
400 20 1270 1320 nine 59
400 250   1250 thirteen 65
400 400   730 17 75
500 20 1030 1140 12 62
500 250   1090 thirteen 67
500 400   730 17 76
500 500   305 34 82

Technological properties of steel 30ХН3А

Forging temperature
Beginning 1220, end 800. Sections up to 100 mm are cooled in air, 101−300 mm — in a pit.
Weldability
limited. Welding methods: RDS, EShS. Heating and subsequent heat treatment are required.
Tendency to release ability
inclined
Flock sensitivity
sensitive

Temperature of critical points of steel 30ХН3А

Critical point ° C
Ac1 700
Ac3 800
Ar3 680
Ar1 610
Mn 305

Impact strength of steel 30ХН3А

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -40 -60
Hardening 820 С, oil, tempering 200 С 79 76 73
Hardening 820 С, oil, tempering 250 С 80 70 74
Hardening 820 С, oil, tempering 300 С 61 44 37
Quenching 820 С, oil, tempering 400 С 51 37 27
Hardening 820 С, oil, tempering 500 С 122 87 72
Quenching 820 С, oil, tempering 600 С 192 182 179

Endurance limit of steel 30ХН3А

σ -1, MPa σ B, MPa Heat treatment, steel condition
510 1330 Tempering 830 С, oil. Vacation 430 C.
420 950 Tempering 830 С, oil. Vacation 580 C.
480 1050  
372 830  

Hardenability of steel 30ХН3А

Tempering 870 C.

Distance from the end, mm / HRC e
1.5 6 12 eighteen 24 thirty 36 42
53 53.5 53 52.5 52 52.5 52.5 51.5
Amount of martensite,% Crit. Diam. in water, mm Crit. Diam. in oil, mm Crete. hardness, HRCэ
  40 20 42
50   100  

Physical properties of steel 30ХН3А

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 215 207 195 187 175 171        
Torsional shear elastic modulus G, GPa 84 81 76 72 67 65        
Density of steel, pn, kg / m 3 7850 7830 7800 7770 7730 7700 7670 7690 7650 7600
Thermal conductivity coefficient W / (m ° С) 34 35 36 36 36 35 31 28 27  
Ud. electrical resistance (p, Nom. m) 268 317 387 469 567 681 817 981    
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) 10.8 11.5 12.2 12.8 13.2 13.5        
Specific heat (C, J / (kg ° C)) 494 504 518 536 558 587 657 703 695 687

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