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Steel 45KHN2MFA

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 45KHN2MFA

Steel 45KhN2MFA: 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 45HN2MFA.

General information about steel 45HN2MFA

Delivery type
Long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 4543−71, GOST 8559−75, GOST 8560−78. Polished bar and silver bar GOST 4543−71, GOST 14955−77. Strip GOST 103−76. Forgings and forged billets GOST 1133−71.
Application
Torsion shafts, gearboxes and other loaded parts, operating under repeated-alternating loads and experiencing dynamic loads.

Chemical composition of steel 45KhN2MFA

Chemical element %
Vanadium (V) 0.10−0.18
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.50−0.80
Copper (Cu), no more 0.30
Molybdenum (Mo) 0.20−0.30
Nickel (Ni) 1.30−1.80
Sulfur (S), no more 0.025
Carbon (C) 0.42−0.50
Phosphorus (P), no more 0.025
Chromium (Cr) 0.80−1.10

Mechanical properties of steel 45HN2MFA

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Hardening 850 ° С, oil. Exposure on vacation 2 hours, cooling in water.
200 1870 1980 8 32 47
300 1700 1800 ten 44 34
400 1470 1530 ten 46 43
500 1250 1290 fourteen 53 81
600 1080 1130 19 58 130
700 720 830 24 68 185

Mechanical properties depending on the section

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Hardening 850 ° С, oil. Vacation 560 ° С, air.
thirty 1320 1380 eleven 40 35
50 1320 1370 12 42 37
80 1300 1370 12 38 37
Hardening 850 ° C, water / oil. Vacation 560 ° С, air.
120 1170 1250 eleven 36 31
160 1080 1180 8 24 33
160 1200 1300 ten 37 46

Mechanical properties of the bar

Heat treatment, delivery condition σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Hardening 860 ° C, oil 1275 1420 7 35 39
Vacation 450 ° C, oil. 1325 1470 7 35 39
Isothermal quenching 880 ° С in a hot environment with a temperature of 280 ° С 1400 2000   26 55
Isothermal quenching 880 ° С in a hot environment with a temperature of 320 ° С 1250 1600   36 100
Isothermal quenching 880 ° С in a hot environment with a temperature of 360 ° С 1000 1350   37 75

Technological properties of steel 45XN2MFA

Forging temperature
Beginning 1200, end 800. Sections up to 60 mm are cooled slowly. For large cross-sections, anti-flake heat treatment is carried out.
Weldability
difficult to weld. Welding method: RDS. Heating and subsequent heat treatment is required.
Tendency to release ability
not inclined
Flock sensitivity
sensitive

Temperature of critical points of steel 45XN2MFA

Critical point ° C
Ac1 735
Ac3 825
Ar3 470
Ar1 370
Mn 275

Impact strength of steel 45XN2MFA

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -20 -40 -60
Hardening 850 С, oil. Vacation 600 C, air. 80 77 73 64
Hardening 850 С, oil. Vacation 550 С, air. 57 54 47 39

Endurance limit of steel 45HN2MFA

σ -1, MPa τ -1, MPa σ B, MPa
760 560 1340
780 620 1530
860 670 2080

Hardenability of steel 45HN2MFA

Hardening 850 ° C.

Distance from the end, mm / HRC e
1.5 ten 20 thirty 40 50 60 70
63 62.5 61.5 59 54 52.5 50.5 50
Crit. Diam. in oil, mm Crete. hardness, HRCэ
50 54−58

Short-term thermal strength of steel 45HN2MFA

Test temperature, ° С s 0.2, MPa σ B, MPa d 5 ,% y,%
100 1100 1180 12 52
200 1040 1150 thirteen 52
300 1020 1140 fourteen 57
400 910 1000 fifteen 68
500 770 830 eighteen 78
600 410 490 35 89

Physical properties of steel 45HN2MFA

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 216 207 197 188 176 168 152 136 128  
Torsional shear elastic modulus G, GPa 87 82 78 73 69 65 59 52 48  
Thermal conductivity coefficient W / (m ° С) 34 34 33 32 31 thirty 29 27 26  
Ud. electrical resistance (p, Nom. m) 300 363 460 557 677 822 993 1160    
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) 11.0 11.6 12.1 12.7 13.3 13.7 13.9 10.9    
Specific heat (C, J / (kg ° C)) 480 500 520 540 555 …        

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