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Steel 38KHN3MFA

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 38KHN3MFA

Steel 38KHN3MFA: 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 38HN3MFA.

General information about steel 38HN3MFA

Delivery type
Circle 38khn3mfa, forging 38khn3mfa, long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 1051−73, 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, GOST 8479−70. Pipes OST 14−24−77.
Application
The most critical heavy-duty parts operating at temperatures up to 400 ° C.

Chemical composition of steel 38KhN3MFA

Chemical element %
Vanadium (V) 0.10−0.18
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.25−0.50
Copper (Cu), no more 0.30
Molybdenum (Mo) 0.35−0.45
Nickel (Ni) 3.00−3.50
Sulfur (S), no more 0.025
Carbon (C) 0.33−0.40
Phosphorus (P), no more 0.025
Chromium (Cr) 1.20−1.50

Mechanical properties of steel 38HN3MFA

Fur. properties
Fur. properties depending on tempering temperature
Fur. properties of bars depending on the section

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 850 ° С, oil. Vacation 600 ° C, air.
  25 1080 1180 12 50 78  
Forgings Hardening Vacation
KP 640 500−800 640 785 ten thirty 39 248−293
Normalization
KP 685 100−300 685 835 12 38 49 262−311
KP 685 300−500 685 835 eleven 33 39 262−311
Hardening. Vacation
KP 685 500−800 685 835 ten thirty 39 262−311
Normalization
KP 735 100−300 735 880 12 35 49 277−321
Hardening. Vacation
KP 735 500−800 735 880       277−321
Normalization
KP 785 <100 785 930 12 40 59 293−331
Hardening. Vacation.
KP 785 100−300 785 930 eleven 35 49 293−331
KP 785 300−500 785 930 ten thirty 39 293−331

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 1590 1800 eleven 43 60 52
300 1470 1080 nine 46 40 48
400 1400 150 ten 45 48 46
500 1290 1370 eleven 45 59 44
600 1130 1200 fourteen 55 88 39

Mechanical properties of bars depending on the section

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Hardening 850 ° С, oil. Vacation 560 ° С, air.
Sample cutting location — center thirty 1250 1330 thirteen 52 70
Sample cutting location — center 50 1210 1300 thirteen 52 73
Sample cutting location — center 200 1070 1150 thirteen 40 80
Sample cutting location — edge 200 1210 1260 12 49 70
Quenching 850 ° C, through water into oil. Vacation 600 ° C, air.
Sample cutting location — center 80 1130 1190 fourteen 52 84
Sample cutting location — center 120 1110 1170 fourteen 52 93
Sample cutting location — center 160 1150 1200 thirteen 40 88
Sample cutting location — edge 160 1160 1220 fifteen 54 75
Sample cutting location — center 240 1070 1130 thirteen 50 85
Sample cutting location — edge 240 1170 1210 fourteen 53 78

Technological properties of steel 38HN3MFA

Forging temperature
Beginning 1180, end 780. Sections up to 100 mm are cooled in a pit, over 100 mm are subjected to low-temperature annealing.
Weldability
not applicable for welded structures.
Tendency to release ability
not inclined
Flock sensitivity
hypersensitive

Temperature of critical points of steel 38XN3MFA

Critical point ° C
Ac1 725
Ac3 775
Ar3 300
Ar1 250
Mn 260

Impact strength of steel 38KhN3MFA

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -20 -40 -60
Hardening 850 С, oil. Vacation 600 C, air. 90 85 78 70
Hardening 850 С, oil. Vacation 550 С, air. 83 71 63 57

Endurance limit of steel 38HN3MFA

σ -1, MPa n σ B, MPa σ 0.2, MPa Heat treatment, steel condition
412 5E + 6   1030 Hardening. High vacation.
500 2E + 7 980   Hardening 870 C, holding for 1 h, oil. Vacation 700−720 C, exposure 2 h.

Hardenability of steel 38HN3MFA

Distance from the end, mm / HRC e
3 ten 20 thirty 40 50 70
51.5 51 50.5 50 50 49.5 49
Heat treatment Crit. Diam. in oil, mm Crete. hardness, HRCэ
Tempering 840 C, oil. 150 57−60

Short-term thermal strength of steel 38HN3MFA

Test temperature, ° С s 0.2, MPa σ B, MPa d 5 ,% y,%
100 1130 1260 thirteen 53
200 1080 1210 thirteen 54
300 1060 1180 fifteen 59
400 980 1080 17 65
500 830 880 19 75
600 520 590 26 87
700 170 200 80 98
800 88 98 58 98

Physical properties of steel 38KhN3MFA

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 210 203 197 190 184 176 170 154 137  
Torsional shear elastic modulus G, GPa 83 80 77 75 72 69 66 60 53  
Density of steel, pn, kg / m 3 7900                  
Thermal conductivity coefficient W / (m ° С) 34 34 34 33 32 32 thirty 29 28  
Ud. electrical resistance (p, Nom. m) 300 321 365 437 516 613 750 897 1080  
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) 12.0 12.5 12.9 13.3 13.6 13.8 13.8 10.7    
Specific heat (C, J / (kg ° C)) 496 508 525 538 567 601 672 697    

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