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Steel 38KH2N2MA

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 38KH2N2MA

Steel 38Х2Н2МА: 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 brand — Steel 38X2H2MA.

General information about steel 38X2H2MA

Delivery type
Circle 38x2n2ma, 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, GOST 1051−73. Polished bar and silver bar GOST 14955−77. Strip GOST 103−76. Forgings and forged billets GOST 1133−71, GOST 8479−70. Pipes OST 14−21−77.
Application
Shafts, connecting rods, bolts, studs and other large, especially critical, heavy-loaded parts of complex configuration, used in an improved condition.

Chemical composition of steel 38X2H2MA

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.25−0.50
Copper (Cu), no more 0.30
Molybdenum (Mo) 0.20−0.30
Nickel (Ni) 1.30−1.70
Sulfur (S), no more 0.025
Carbon (C) 0.33−0.40
Phosphorus (P), no more 0.025
Chromium (Cr) 1.30−1.70

Mechanical properties of steel 38Х2Н2МА

Mechanical properties

Heat treatment, delivery condition σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Bar. Hardening 870 ° С, oil. Vacation 580 ° C, air or oil.
  930 1080 12 50 78  
Forgings. Hardening. Vacation.
KP 440 440 635 eleven thirty 39 197−235
KP 735 735 880 thirteen 40 59 277−321
KP 785 785 930 12 40 59 293−331

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 850 ° С, oil.
200 1520 1810 eleven 46 44 53
300 1420 1630 ten 45 37 49
400 1350 1470 ten 46 39 46
500 1190 1240 thirteen 55 68 40
600 880 960 17 64 137 32

Mechanical properties depending on the section

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% δ 10 ,% ψ,% KCU, J / m 2
Hardening 860 ° C, oil. Vacation 560 ° С, water
Sample cutting location — center thirty 860 1000 19   64 137
Sample cutting location — center 50 830 970 sixteen   61 144
Sample cutting location — center 80 750 900 eighteen   61 150
Sample cutting location — center 120 740 900 19   60 144
Sample cutting location — edge 120 770 940 eighteen   61 151
Sample cutting location — center 200 750 900 17   52 66
Sample cutting location — edge 200 770 930 17   57 72
Hire. Hardening 950 ° С, oil. Vacation 580−600 ° C.
Sample cutting location — center 500 760 930   fifteen 52 57
Sample cutting location — edge 500 770 960   17 55 53
The sample is cut in the center. Cross samples 500 740 930   eleven   23
The sample was cut out at the edge. Cross samples 500 760 930   eleven 23 22
Sample cutting location — center 700 740 900   17 51 45
Sample cutting location — edge 700 740 930   17 52  
The sample is cut in the center. Cross samples 700 790 900       fifteen
The sample was cut out at the edge. Cross samples 700 730 880   eleven 20 57
Sample cutting location — center 900 710 850   7 sixteen 26
Sample cutting location — edge 900 700 890   sixteen 49 46
The sample is cut in the center. Cross samples 900 690 730     6 20
The sample was cut out at the edge. Cross samples 900 700 870   eleven 22 24

Technological properties of steel 38Х2Н2МА

Forging temperature
Start 1200, end 800. Cooling is slow.
Weldability
not applicable for welded structures.
Tendency to release ability
not inclined
Flock sensitivity
sensitive

Temperature of critical points of steel 38X2H2MA

Critical point ° C
Ac1 753
Ac3 790
Ar3 490
Ar1 370
Mn 320

Impact strength of steel 38X2H2MA

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -40 -50
Blanks with a cross section of 30 mm. Guenching 860 C, oil. Vacation 560 С, water. 137 129 122
Workpieces with a cross section of 50 mm 144 138 112
Workpieces with a section of 80 mm 150 93 85
Workpieces with a section of 120 mm 144 76 73
Workpieces with a section of 200 mm 66 34  

Endurance limit of steel 38X2H2MA

σ -1, MPa n σ B, MPa σ 0.2, MPa
363 5E + 6   880
300 5E + 6 720 520

Hardenability of steel 38Х2Н2МА

Hardening 845 C. Hardness for strips of hardenability HRCe.

Distance from the end, mm / HRC e
1.5 3 five nine thirteen 20 25 thirty 40 50
51.5−59 51.5−59 50.5−59 49.5−58 49.5−58 47.5−57 46.5−57 45.5−56 44.5−56 42.5−56
Crit. Diam. in oil, mm Crete. hardness, HRCэ
100 53

Short-term thermal strength of steel 38Х2Н2МА

Test temperature, ° С s 0.2, MPa σ B, MPa d 5 ,% y,%
100 820 930 17 64
200 860 910 sixteen 64
300 730 880 sixteen 65
400 690 780 eighteen 73
500 570 620 22 80
600 340 400 35 82

Physical properties of steel 38Х2Н2МА

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 213 206 194 180 174 164 157 141 129  
Torsional shear elastic modulus G, GPa 84 80 76 71 67 63 59 59 48  
Thermal conductivity coefficient W / (m ° С) 38 37 35 35 33 32 thirty 28 28  
Ud. electrical resistance (p, Nom. m) 322 398 482 592 740 910 1090 1300    
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) 11.9 12.5 13.1 13.3 13.8 14.1 14.6 11.8    
Specific heat (C, J / (kg ° C)) 490 502 523 532 565 560 615 670    

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