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Steel 50G

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 50G

Steel 50G: 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 50G.

General steel 50G

Substitute brand
steel: 40G, 50.
Delivery type
long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 4543−71, GOST 7417−75, GOST 8559−75, GOST 8560−78. Thick sheet GOST 1577−81, GOST 19903−74. Tape GOST 2283−79. Strip GOST 4543−71, GOST 82−70. Forgings and forged billets GOST 1133−71, GOST 4543−71.
Application
friction discs, shafts, gears, spline shafts, connecting rods, camshafts, bearing bushings, cranks, spindles, flywheel rims, diesel and gas engine crankshafts and other parts that require increased strength and durability.

Chemical composition of steel 50G

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.70−1.00
Copper (Cu), no more 0.30
Nickel (Ni), no more 0.30
Sulfur (S), no more 0.035
Carbon (C) 0.48−0.56
Phosphorus (P), no more 0.035
Chromium (Cr), no more 0.30

Mechanical properties of steel 50G

Mechanical properties

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% δ 4 ,%
Bar. Hardening 850 ° С, oil. Vacation 600 ° C, air. 25 390 650 thirteen  
Cold rolled annealed strip 0.1−1.5   > 650   fifteen
Cold-rolled annealed strip of the highest quality category 0.1−4.0   > 650   eighteen

Mechanical properties at elevated temperatures

test t, ° C σ 0.2, MPa σ B, MPa δ 10 ,% ψ,%
Normalization 830 ° C, air (coarse-grained structure)
200 370 760 ten 22
300 285 740 20 35
400 260 590 20 47
500 220 520 37 52
Annealing (fine grain structure)
200 570 810 fifteen 40
300 460 780 25 52
400 375 640 25 55
500 255 450 45 60

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Hardening 840 ° C, water.
540 740 880 17 50 98 260
580 680 810 eighteen 52 108 235
620 600 750 22 56 118 220

Mechanical properties 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 840 ° C, water. Vacation 560−580 ° С, air.
Sample cutting location — center thirty 550 800 eighteen 55 78
Sample cutting location — center 50 490 760 eighteen 55 68
Sample cutting location — center 80 470 740 eighteen 50 59
Sample cutting location — center 120 450 740 sixteen 50 59
Sample cutting place — 1 / 2R 120 470 760      
Sample cutting location — edge 120 510 800      
Sample cutting location — center 160 430 740 sixteen 45 59
Sample cutting place — 1 / 2R 160 470 760      
Sample cutting location — edge 160 510 800      
Sample cutting location — center 240 430 740 sixteen 45 59
Sample cutting place — 1 / 2R 240 450 760      
Sample cutting location — edge 240 490 780      

Technological properties of steel 50G

Forging temperature
Beginning 1250, end 780. Billets with a cross section of up to 400 mm are cooled in air.
Weldability
difficult to weld. Welding methods: RDS — heating and subsequent heat treatment are required. KTS without restrictions.
Machinability by cutting
In the quenched and tempered state at HB 202 and σ B = 710 MPa K υ tv.spl. = 0.90.
Tendency to release ability
inclined at 1.0% Mn.
Flock sensitivity
sensitive

Temperature of critical points of steel 50G

Critical point ° C
Ac1 723
Ac3 760
Ar3 740
Ar1 680
Mn 320

Impact strength of steel 50G

Impact strength, KCU, J / cm 2

Delivery status, heat treatment -20 -40 -50
Tempering 840 C, oil. Vacation 600 C. bw = 660 MPa 63 47 39

Endurance limit of steel 50G

σ -1, MPa n σ B, MPa Heat treatment, steel condition
417 1E + 5    
353 5E + 5    
333 1E + 6 660 Tempering 840 C, oil. Vacation 600 C.

Hardenability of steel 50G

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 eighteen 24
54−62 49.5−59 43.5−56 35.5−51.5 31−45.5 29−40 25−33.5 23−33.5 21.5−32 20−31
Amount of martensite,% Crit. Diam. in water, mm Crit. Diam. in oil, mm Crete. hardness, HRCэ
50 23−33 6−12 48−51
90 25 8 54−57

Physical properties of steel 50G

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 216 213 208 199 185 174 160 142 130  
Torsional shear elastic modulus G, GPa 84 83 81 77 73 68 62 55 50  
Density of steel, pn, kg / m 3 7810                  
Thermal conductivity coefficient W / (m ° С) 43 42 41 38 36 34 31 29 28  
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 12.5 13.2 13.8 14.3 14.8 15.1 12.3    
Specific heat (C, J / (kg ° C)) 487 500 517 533 559 584 609 676    

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