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Steel 50KHN

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 50KHN

Steel 50ХН: a brand of steels and alloys. Below is a 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 50XN.

General information about steel 50ХН

Substitute brand
steel 40ХН, 60ХГ.
Delivery type
Long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 10702−78, 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. Rolls OST 24.013.21−5, OST 24.013.04−83. Pipes OST 14−21−77.
Application
Hot rolling rolls, pinion shafts, gear wheels, tires, crankshafts, connecting rods, bolts, exhaust valves and other large critical parts.

Chemical composition of steel 50ХН

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.50−0.80
Copper (Cu), no more 0.30
Nickel (Ni) 1.00−1.40
Sulfur (S), no more 0.035
Carbon (C) 0.46−0.54
Phosphorus (P), no more 0.035
Chromium (Cr) 0.45−0.75

Mechanical properties of steel 50ХН

Mechanical properties

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Bar. Hardening 820 ° C, water or oil. Vacation 530 ° C, water or oil.
25 885 1080 nine 40 49  
Hardening 810−830 ° С, oil. Vacation 180−220 ° С, air.
40 1470 1670 8 25 39  
Hardening 820 ° С, oil. Vacation 500 ° C, water or oil.
60 780 980 nine 40 49 269
Hardening 820−840 ° С, oil. Vacation 550−600 ° C, water or oil.
120 640 780     59 250−285
Forging. Heating up to 1200 ° С, holding for 10 h, forging, isothermal annealing, normalization, high tempering.
960 330 720 ten nine 20  
960 380 770 eighteen 37 35  
Normalization 840−870 ° C, air. Vacation 580−630 ° С, oven.
100−300 450 760 12 35 29 229−285
301−600 420 730 12 thirty 25 223−269
601−900 390 690 eleven 25   207−255
901−1200 340 670 ten 20   201−241

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% HB
Hardening 800 ° C, oil.
200 1520 1760 8 25 460
300 1420 1640 7 32 445
400 1220 1420 eleven 41 385
500 980 1160 fourteen 52 310
600 740 930 20 60 250

Mechanical properties versus test temperature

test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,%
Hardening 840 ° С, oil. Vacation 480 ° C.
20 720 910 21
150 680 880  
290 670   27
425 520 670 25

Technological properties of steel 50ХН

Forging temperature
Beginning 1200, end 800. Sections up to 250 mm are cooled in air, 251−350 mm — in a pit.
Weldability
not applicable for welded structures (except for KTS).
Machinability by cutting
In the normalized and released state at HB 170−217 K υ tv.spl. = 0.7, K υ b.st. = 0.8.
Tendency to release ability
inclined
Flock sensitivity
sensitive

Temperature of critical points of steel 50ХН

Critical point ° C
Ac1 735
Ac3 755
Ar3 690
Ar1 660
Mn 300

Impact strength of steel 50ХН

Impact strength, KCU, J / cm 2

Delivery status, heat treatment -20 -60
Billets with a cross section of 670 mm. Heating up to 1200 C, holding for 10 h, forging, isothermal annealing. Normalization, high vacation. 16−43 8−22

Hardenability of steel 50ХН

Hardening 845 С. Hardness HRCэ.

Distance from the end, mm / HRC e
1.5 10.5 fifteen eighteen 21 24 27 thirty 33 39
57 57.5 57 56 54.5 53.5 52.5 51 49.5 46

Physical properties of steel 50ХН

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Density of steel, pn, kg / m 3 7860                  
Thermal conductivity coefficient W / (m ° С)   43 40 39 38 37 36 32 23 24
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) 11.8   12.3 13.4 14.0          
Specific heat (C, J / (kg ° C)) 500 510 560 630 700 800 910 650 610 700

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