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Steel 50X

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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