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Steel 40G2

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 40G2

Steel 40G2: a brand of steels and alloys. Below is the systematized information on the purpose, chemical composition, types of supplies, substitutes, temperature of critical points, physical, mechanical, technological and casting properties for the brand — Steel 40G2.

General information about steel 40G2

Substitute brand
steel: 45G2, 60G.
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 Polished bar and silver bar GOST 4543−71, GOST 14955−77. Strip GOST 103−76. Forgings and forged billets GOST 1133−71, GOST 4543−71
Application
axles, crankshafts, piston drains, levers, camshafts, cardan shafts, axle shafts and other parts.

Chemical composition of steel 40G2

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) 0.36−0.44
Phosphorus (P), no more 0.035
Chromium (Cr), no more 0.30

Mechanical properties of 40G2 steel

Mechanical properties

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% HB
Bar. Hardening 860 ° C, oil. Vacation 650 ° С, air 25 380 660 12 40  
Annealing: heating up to 775 ° С at a rate of 250 deg / h, holding, cooling at a rate of 40 deg / h   380 660 23 57 179
Normalization 870−925 ° C, air. Hardening 800−830 ° С, oil. Vacation 425 ° C. 38 930 1100 ten 40 331

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa δ,% δ 10 ,% ψ,% KCU, J / m 2 HB
A bar with a section of 28 mm. Tempering 820 ° С, oil
250 1490 1760   4 19 ten 500
300 1470 1620   6 thirty ten 460
400 1270 1330   ten 50 59 400
500 980 1080   fifteen 60 127 340
600 780 850   19 62 176 250
A bar with a section of 25 mm. Hardening 830 ° С, oil. Cooling after tempering in oil
375   1390 8   44 ten 402
450 950 1040 12   55 29 321
525 880 980 fourteen   55 35 286
600 680 800 eighteen   65 90 241

Mechanical properties depending on the section

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ,% ψ,% KCU, J / m 2 HB
Sealing 820 ° C, water. Vacation 600 ° C, water.
Sample cutting location — center 50 590 770 eighteen 57 68 220
Sample cutting location — center 75 540 730 eighteen 54 59 210
Sample cutting location — edge 75   820 sixteen 60 68 242
Sample cutting location — center 100 490 720 eighteen 56 29 210
Sample cutting location — edge 100 660 800 sixteen 60 41 241

Mechanical properties versus test temperature

test t, ° C σ 0.2, MPa σ B, MPa δ 10 ,% ψ,%
Annealing 900 ° С, air, then heating to 650 ° С, cooling with an oven
-20 450 800 eighteen 40
100 410 740 17 40

Technological properties of steel 40G2

Forging temperature
The beginning is 1180−1200, the end is 800−850. Slow cooling of sections larger than 60 mm.
Weldability
difficult to weld. RDS, heating and subsequent heat treatment is required.
Machinability by cutting
at HB 201 K υ tv.spl. = 0.8, K υ b.st. = 0.7.
Tendency to release ability
inclined
Flock sensitivity
sensitive

Temperature of critical points of steel 40G2

Critical point ° C
Ac1 713
Ac3 780
Ar3 710
Ar1 627
Mn 340

Endurance limit of steel 40G2

σ -1, MPa σ B, MPa Heat treatment, steel condition
196 720 Quenching 850 С, water. Vacation 620 C.

Hardenability of steel 40G2

Hardness for strips HRCe.

Distance from the end, mm / HRC e
2 five ten fifteen 20 25 thirty 35 40 45
55−62 52−61.5 39.5−57.5 32−53.5 27.5−48.5 25.5−43.5 24−40.5 23.5−37.5 22.5−36.5 22−35.5
Heat treatment Amount of martensite,% Crit. Diam. in water, mm Crit. Diam. in oil, mm Crete. hardness, HRCэ
Hardening 50 48−93 24−61 43−46
  90 38−71 16−44 48−53

Physical properties of steel 40G2

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 212                  
Density of steel, pn, kg / m 3 7800                  

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