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Steel 50X

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 50X

Steel 50X: 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 50X.

General information about steel 50X

Substitute brand
steel: 40X, 45X, 50XH, 50XFA.
Delivery type
long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated product 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.
Application
shafts, spindles, set screws, large gear wheels, gear shafts, thrust washers, hot rolled rolls and other upgradable parts that require increased hardness, wear resistance, strength and operating under low shock loads.

Chemical composition of steel 50X

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.50−0.80
Copper (Cu), no more 0.30
Nickel (Ni), no more 0.30
Sulfur (S), no more 0.035
Carbon (C) 0.46−0.54
Phosphorus (P), no more 0.035
Chromium (Cr) 0.80−1.10

Mechanical properties of steel 50X

Mechanical properties

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB HRC e
Bar. Hardening 830 ° С, oil. Vacation 520 ° C, water or oil. 25 880 1080 nine 40 39    
Forgings. Normalization. KP 345 <100 345 590 eighteen 45 59 174−217  
Forgings. Normalization. KP 345 100−300 345 590 17 40 54 174−217  
Forgings. Normalization. KP 345 300−500 345 590 fourteen 38 49 174−217  
Forgings. Hardening. Vacation. KP 345 500−800 345 590 12 38 39 174−217  
Forgings. Hardening. Vacation. KP 540 100−300 540 685 thirteen 40 49 223−262  
Forgings. Hardening. Vacation. KP 590 100−300 590 735 thirteen 40 49 235−277  
Forgings. Hardening. Vacation. KP 640 <100 640 785 thirteen 42 59 248−293  
Bar. Hardening 830 ° С, oil, tempering 190 ° С.   1270 1470 6 22 29   46
Bar. Hardening 820 ° С, oil, tempering 650 ° С.   760 980 ten 45 59    

Mechanical properties at elevated temperatures

test t, ° C σ B, MPa δ 10 ,% ψ,%
Sample 10 mm in diameter and 100 mm long. Hardening 820−840 ° С, oil. Vacation 600−650 ° С, air.
800 87 21 37
900 43 fourteen 23
1000 25 sixteen 20
1100 21 35 61

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa δ 5 ,% δ 10 ,% ψ,% KCU, J / m 2 HB
Bar with a diameter of 25 mm. Tempering 820 ° С, oil
300 1670 1810 ten   thirty   520
400 1520 1670 thirteen   40   470
500 1270 1420 17   52   400
600 1030 1180 21   60   320
Bar with a diameter of 50 mm. Hardening 820 ° С, oil. After tempering, cooling in oil
400 1520 1620   4 39 49  
500 1180 1270   nine 50 147  
600 540 850   17 61    

Technological properties of steel 50X

Forging temperature
Beginning 1250, end 770. Sections up to 100 mm are cooled in air, sections 101−300 mm — in a mold.
Weldability
difficult to weld. Welding methods: RDS — heating and subsequent heat treatment are required. KTS — subsequent heat treatment is required.
Machinability by cutting
In the hot-rolled state at HB 207 σ B = 630 MPa K υ tv.spl. = 0.85, K υ b.st. = 0.80.
Tendency to release ability
inclined
Flock sensitivity
sensitive

Temperature of critical points of steel 50X

Critical point ° C
Ac1 720
Ac3 770
Ar3 693
Ar1 660
Mn 250

Endurance limit of steel 50X

σ -1, MPa σ B, MPa Heat treatment, steel condition
696 1550 Tempering 830 С, oil. Vacation 190 C.
588 1150  

Hardenability of steel 50X

Hardening 840 C. Hardness for strips of hardenability HRCe.

Distance from the end, mm / HRC e
1.5 3 4.5 6 7.5 nine 12 fifteen 24 36
59.5−67.5 59−67.5 58−67 56−66 52−65 46.5−63 38−60 34.5−56 29.5−47 26−40.5
Amount of martensite,% Crit. Diam. in water, mm Crit. Diam. in oil, mm Crete. hardness, HRCэ
50 52−90 27−58 46−49
90 38−75 16−46 53−57

Physical properties of steel 50X

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 207                  
Torsional shear elastic modulus G, GPa 78                  
Density of steel, pn, kg / m 3 7820                  
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) 12.8 13.0 13.8              

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