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Steel 45G2

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 45G2

Steel 45G2: 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 45G2.

General information of steel 45G2

Substitute brand
steel 50G2
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, GOST 1051−73. Polished bar and silver bar GOST 14955−77.
Application
gear shafts, crankshafts and cardan shafts, half-shafts, worms, connecting rod caps, connecting rods, links of conveyor chains and other large-sized medium-loaded parts.

Chemical composition of steel 45G2

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 1.40−1.80
Copper (Cu), no more 0.30
Nickel (Ni), no more 0.30
Sulfur (S), no more 0.035
Carbon (C) 0.41−0.49
Phosphorus (P), no more 0.035
Chromium (Cr), no more 0.30

Mechanical properties of 45G2 steel

Fur. properties
Fur. properties at elevated temperatures
Fur. properties depending on tempering temperature

Mechanical properties

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% HB
Bar. Hardening 850 ° C, low. Vacation 650 ° C, air. 25 400 680 eleven 40  
Annealing: heating up to 780 ° С at a rate of 350 deg / h, holding, cooling with a furnace at a speed of 40 deg / h   350 670 21 44 187
Normalization 810 ° C, air.   480 800 eighteen 51 241

Mechanical properties at elevated temperatures

test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,% ψ,%
Sample 10 mm in diameter and 50 mm in length, rolled and annealed
800 97 115 35 98
900 55 74 54 98
1000 35 49 59 100
1100 27 35 63 100
1200 17 26 73 100

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
A bar with a section of 25 mm. Hardening 810 ° С, oil. Cooling after tempering in oil.
375   1390 7 42 ten 418
450   1200 8 42 19 340
525   1040 thirteen 47 29 302
600 810 920 fifteen 54 49 269
A bar with a cross section of 70 mm. Hardening 820 ° C, water.
300 1180 1500 6 sixteen 29  
400 900 1180 nine 34 39  
500 740 970 thirteen 49 78  
600 640 810 eleven 60 147  
A bar with a cross section of 35 mm. Hardening 850 ° С, oil.
300 1290 1520 five ten ten  
400 1080 1270 6 sixteen ten  
500 730 1030 eleven 39 78  
600 670 860 eighteen 52 166  
A bar with a cross section of 70 mm. Hardening 850 ° С, oil.
300 610 1010 17 47 49  
400 640 980 17 47 73  
500 630 920 eighteen 50 88  
600 540 820 20 55 98  

Technological properties of steel 45G2

Forging temperature
The beginning is 1200, the end is 750−800. Sections up to 100 mm are cooled in air, sections 101−300 mm — in a mold.
Weldability
RDS — heating and subsequent heat treatment are required. KTS — subsequent heat treatment is required.
Machinability by cutting
After normalization at HB 229 K υ tv.spl. = 0.80, K υ b.st. = 0.55.
Tendency to release ability
inclined
Flock sensitivity
insensitive

Temperature of critical points of steel 45G2

Critical point ° C
Ac1 711
Ac3 765
Ar3 704
Ar1 626
Mn 245

Impact strength of steel 45G2

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -20 -40
Normalization   59  
Ingot. Quenching with high tempering. HB 228−235. Longitudinal specimen 186 176 157
Ingot. Quenching with high tempering. HB 228−235. Cross pattern 24 29 24

Endurance limit of 45G2 steel

σ -1, MPa σ B, MPa σ 0.2, MPa Heat treatment, steel condition
598 1200 1070  
686 1570   HB 570
382 900 550 HB 248

Hardenability of steel 45G2

Hardening 840 C. Hardness for strips of hardenability HRCe.

Distance from the end, mm / HRC e
1.5 3 4.5 6 nine 12 fifteen eighteen 21 27
54−61 52−60.5 50−60 48.5−59 41.5−58 34.5−55 29−52.5 27−48 25.5−45.5 23−41.5
Amount of martensite,% Crit. Diam. in water, mm Crit. Diam. in oil, mm Crete. hardness, HRCэ
50 43−85 20−55 44−49
90 23−64 6−38 51−55

Physical properties of steel 45G2

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 204                  
Torsional shear elastic modulus G, GPa 83                  
Density of steel, pn, kg / m 3 7810                  
Thermal conductivity coefficient W / (m ° С)     45 43 41 35        
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) 11.3 11.9 12.7   14.7          
Specific heat (C, J / (kg ° C))   445 428              

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