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Steel 30G

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 30G

Steel 30G: 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 grade — Steel 30G.

General steel 30G

Substitute brand
steel: 35, 40G
Delivery type
long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 4543−71, GOST 8559−75, GOST 8560−78, GOST 7417−75, GOST 1051−73. Polished bar and silver bar GOST 4543−71, GOST 14955−77. 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
improved parts, which are subject to low strength requirements: rods, axles, cylinders, discs, bolts, nuts, screws and others.

Chemical composition of steel 30G

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.70−1.0
Copper (Cu), no more 0.30
Nickel (Ni), no more 0.30
Sulfur (S), no more 0.035
Carbon (C) 0.27−0.35
Phosphorus (P), no more 0.035
Chromium (Cr), no more 0.30

Mechanical properties of steel 30G

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 ° С, air 25 315 540 20 45 78
Tape. Hardening 810−820 ° C. Vacation 400 ° C, air. 3   1130 6−7    

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 70 mm. Hardening 850 ° С, oil.
300 540 780 20 45 39
400 540 760 20 52 29
500 490 700 21 59 49
600 440 640 25 69 117

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.
Sample cutting location — center 40 540 710 25   137
Sample cutting location — edge 40 590 740 22 65 157
Sample cutting location — center 80 490 650 24   108
Sample cutting location — edge 80 560 730 21 64 157
Sample cutting location — center 120 490 600 22   98
Sample cutting location — edge 120 540 710 21 63 147
Sample cutting location — center 160 490 590 23   88
Sample cutting location — edge 160 530 700 22 63 137
Sample cutting location — center 200 450 600 27 63 98

Mechanical properties versus test temperature

test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Normalization 900 ° C, air. Vacation 680−710 ° C.
-20 370 710 20 32 136
20 330 630 29 46 145
100 305 590 21 41 200

Technological properties of steel 30G

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 149−197 K υ tv.spl. = 1.0, K υ b.st. = 0.80.
Tendency to release ability
inclined at 1.0% Mn
Flock sensitivity
not sensitive

Temperature of critical points of steel 30G

Critical point ° C
Ac1 723
Ac3 810
Ar3 785
Ar1 680
Mn 870

Impact strength of steel 30G

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -20 -70
Normalization 870 С, air 98 34 sixteen

Endurance limit of steel 30G

σ -1, MPa τ -1, MPa n σ B, MPa σ 0.2, MPa Heat treatment, steel condition
353 216       Quenching 840 C, water. Vacation 500−550 C.
265   5E + 6 490    
235   5E + 6 580    
412     820 650 Tempering 790 C, water. Vacation 600 C.

Hardenability of steel 30G

Hardening 810 C. Hardness for strips of hardenability HRCe.

Distance from the end, mm / HRC e
1.5 3 4.5 6 nine 12 fifteen 21 thirty 36
54 48.5 40.5 35.5 32 thirty 28 25 22 20.5

Physical properties of steel 30G

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 204                  
Density of steel, pn, kg / m 3 7810                  
Thermal conductivity coefficient W / (m ° С)   76 65 53 44 38        
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) 12.6 13.9 14.6 15.0 15.5 15.6 14.8      
Specific heat (C, J / (kg ° C)) 470 483 546 601 864          

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