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Steel 40G

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 40G

Steel 40G: 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 brand — Steel 40G.

General information of steel 40G

Substitute brand
steel: 45, 40X.
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, GOST 10702−78. Thick sheet GOST 1577−81, GOST 19903−74. Strip GOST 103−76, GOST 82−70. Forgings and forged billets GOST 1133−71, GOST 4543−71.
Application
axles, crankshafts, gears, rods, tires, fittings, connecting rods, sprockets, camshafts, plunger heads and other parts that require increased strength.

Chemical composition of steel 40G

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) 0.37−0.45
Phosphorus (P), no more 0.035
Chromium (Cr), no more 0.30

Mechanical properties of steel 40G

Mechanical properties

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Bar. Hardening 860 ° C, water. Vacation 600 ° C, air. 25 350 590 17 45 59
Hardening 830−850 ° С, water. Vacation 180−200 ° C, air.            

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
A bar with a cross section of 35 mm. Hardening 800 ° C, water.
300 860 1120 ten thirty 39
400 780 1010 ten 43 59
500 680 880 fifteen 54 108
600 530 740 20 63 137
700 430 630 35 70 157
A bar with a cross section of 35 mm. Hardening 850 ° С, oil.
300 570 760 fourteen 50 68
400 550 760 sixteen 51 73
500 510 720 eighteen 51 73
600 440 680 22 55 98
700 320 580 thirty 66 78
A bar with a cross section of 70 mm. Hardening 800 ° C, water
300 580 880 fourteen 46 39
400 570 850 fifteen 47 39
500 540 790 19 55 93
600 500 730 23 60 157
700 430 620 27 70 137
A bar with a cross section of 70 mm. Hardening 850 ° C, oil
300 570 840 fifteen 48 59
400 550 800 17 49 68
500 510 780 eighteen 50 68
600 440 680 24 55 98
700 390 590 thirty 66 117

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 550 ° C, air.
Sample cutting location — center 50 570 820 20 49 88
Sample cutting location — edge 50 590 820 20 51 88
Sample cutting location — center 100 490 790 22 50 68
Sample cutting location — edge 100 540 810 19 53 68
Sample cutting location — center 200 480 760 24 50 59
Sample cutting location — edge 200 530 790 fifteen 52 68

Technological properties of steel 40G

Forging temperature
Beginning 1250, end 800. Billets with a cross section up to 400 mm are cooled in air.
Weldability
restrictedly weldable. Welding methods: RDS, ADS submerged arc. Heating and subsequent heat treatment is recommended. KTS without restrictions.
Machinability by cutting
In the normalized state at HB 174−207 K υ tv.spl. = 0.95, K υ b.st. = 0.70.
Tendency to release ability
inclined
Flock sensitivity
insensitive

Temperature of critical points of steel 40G

Critical point ° C
Ac1 723
Ac3 785
Ar3 770
Ar1 680

Impact strength of steel 40G

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -20 -40 -60
Hot rolled condition 69 70 53 29
Annealing 44 ten 7  
Quenching, tempering 173 137 117 82

Endurance limit of steel 40G

σ -1, MPa σ B, MPa σ 0.2, MPa Heat treatment, steel condition
515 1160 1120 Hardening 800 C, water. Vacation 380 C, 1 hour, air.
402 890 790 Hardening 800 C, water. Vacation 515 C, 1h, air.
367 790 660 Hardening 800 C, water. Vacation 570 C, 1 hour, air.
328 710 630 Hardening 800 C, water. Vacation 650 C, 1h, air.

Hardenability of steel 40G

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
50.5−59 47.5−57.5 41.5−54 32−49.5 27−41.5 24−35 20.5−29.5 27.5 26
Amount of martensite,% Crit. Diam. in water, mm Crit. Diam. in oil, mm Crete. hardness, HRCэ
50 23−27 6−14 43−46
90 15−23 4−6 48−53

Physical properties of steel 40G

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 200                  
Density of steel, pn, kg / m 3 7810                  
Thermal conductivity coefficient W / (m ° С)   60 53   47 24        
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) 11.1 11.7 12.7   14.3          
Specific heat (C, J / (kg ° C)) 487 483   491   575        

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