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Steel 30ХН3А

VSt6ps VSt5sp VSt3kp VSt4kp VSt6sp VSt2kp Vst4ps St0 VSt2ps VSt3ps VSt5ps VSt2sp VSt3sp 18К 08ps 10ps 15К 18kp 20ps 35 55 05kp 08Ю 15kp 20 (20А) 22К 40 58 (55ПП) 08 10 (Art. 10) 12К 15pc 20К 25 45 60 08kp 10kp 15 16К 20kp 30 50 0cB 60С2 60C2XA 50XFA 60C2A 60C2CHFA 65C2VA 85 55XGR 65 70C3A 55С2 60Г 60C2H2A 65Г 70 75 SHKH15 SHKH15SG SH4 А12 А20 A40G А30 10XNDP 14G2AF 15G2AFDps 17GS 18G2AFps 09Г2 10G2BD 10ХСНД 12GS 15G2SFD 16GS 35GS 14CGS 15ХСНД 20ХГ2Ц 09G2S 10G2S1 14Г2 16G2AF 17G1S 25G2S 10Г2 14X2GMR 15KHF 18CR2N4MA 20Г 20X2H4A 20XGR 20KHN2M (20KHNM) 30Г 30CGS 30CRNI2MA 34CRNI3M 35Х 38CR2N3M 38XA 38CMA 3CR3M3F 40Х 40XFA 45CRN 50Г2 12XH2 15Х 20KHGSA 20XHN3A 25CGSA 30KHGSA 30CRNI2MOVA 33HS 35KHN1M2FA 38CR2NM 40Г 40CR2H2MA 40CRN 45Г 45CRNI2MOVA 50Х 12XH2A 18CGT 20CRNR 20CRNI4FA 25CGT 30Х 30CGSN2A 30KHN3A 34CRNI1M 35Г 36CR2NI2MOVA 38KH2NMF 38CRN 38CRNI3MA 40Г2 40CRNI2MA 45Г2 47GT 50XH 12CR2N4A 12XHN3A 15Г 18CR2N4VA 20Х 20XH 20XNR 30CGT 30ХН3М2ФА 35Г2 35CGSA 38CR2H2MA 38CRNI3MOVA 40HS 45Х 50Г

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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