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Steel 45G

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 45G

Steel 45G: 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 45G.

General information of steel 45G

Substitute brand
steel: 40G, 50G
Delivery type
long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 10702−78. Calibrated bar GOST 4543−71, GOST 7417−75, GOST 8559−75, GOST 8560−78, GOST 10702−78, GOST 1051−73. Polished bar and silver bar GOST 4543−71, GOST 14955−77, GOST 10702−78. Strip GOST 4543−71, GOST 103−76. Forgings and forged billets GOST 1133−71, GOST 4543−71.
Application
crankshafts, connecting rods, axles, propeller shafts, brake levers, friction discs, gear wheels, splined and gear shafts, anchor bolts.

The chemical composition of steel 45G

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) 0.42−0.50
Phosphorus (P), no more 0.035
Chromium (Cr), no more 0.30

Mechanical properties of 45G steel

Mechanical properties

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Bar. Hardening 850 ° С, oil. Vacation 600 ° C, air. 25 370 620 fifteen 40 49  
Annealing: heating up to 780 ° С at a speed of 340 deg / h, holding, cooling with a furnace at a speed of 40 deg / h.   390 650 23 50 43 179
Normalization 810 ° C, air.   460 730 21 57 55 228

Mechanical properties at elevated temperatures

test t, ° C σ 0.2, MPa σ B, MPa δ 10 ,% ψ,%
Normalization 830 ° C (coarse-grained structure)
200 370 760 ten 22
300 285 740 20 35
400 265 590 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 ,% δ 4 ,% ψ,% KCU, J / m 2 HB
A bar with a section of 25 mm. Hardening 790 ° C, water
375 1230 1310   nine 42 fourteen 418
450 1120 1210   eleven 48 39 340
525 900 1000   thirteen 51 59 302
A bar with a section of 25 mm. Hardening 810 ° C, oil
375   1280   8 40 17 351
525 810 950   fourteen 52 68 269
A bar with a section of 25 mm. Hardening 850 ° C, oil
300 600 880 sixteen   50 39  
400 580 880 sixteen   50 49  
500 580 870 eighteen   51 49  
600 500 780 22   57 68  

Mechanical properties depending on the section

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Hardening 840 ° C, water. Vacation 570 ° С, air.
thirty 550 800 eighteen 55 78
50 490 760 eighteen 55 68
120 450 740 sixteen 50 59
200 430 740 sixteen 45 59
240 430 740 sixteen 45 59

Technological properties of steel 45G

Forging temperature
Beginning 1190, end 820.
Weldability
difficult to weld. ADS welding method. Preheating and subsequent heat treatment are recommended.
Tendency to release ability
not inclined

Temperature of critical points of steel 45G

Critical point ° C
Ac1 715
Ac3 735
Ar3 710
Ar1 635

Endurance limit of 45G steel

σ -1, MPa σ B, MPa σ 0.2, MPa
418 670 375
409 770 690

Hardenability of steel 45G

Distance from the end, mm / HRC e
 
 
Heat treatment Amount of martensite,% Crit. Diam. in water, mm Crit. Diam. in oil, mm Crete. hardness, HRCэ
Hardening 50 30−50 10−25 45−49
  90 25−42 8−20 52−55

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