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Steel 65G

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 65G

Steel 65G: 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 65g characteristics.

General steel 65G

Substitute brand
steel: 70, U8A, 70G, 60S2A, 9Hs, 50HFA, 60S2, 55S2.
Delivery type
Sheet 65g, tape 65g, circle 65g, wire 65g, strip 65g, long products, including shaped: GOST 14959−79, GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 7419.0−78 — GOST 7419.8 -78. Calibrated bar GOST 14959−79, GOST 7417−75, GOST 8559−75, GOST 8560−78, GOST 1051−73. Polished bar and silver bar GOST 14955−77, GOST 7419.0−78 — GOST 7419.8−78. Thick sheet GOST 1577−81. Tape GOST 1530−78, GOST 2283−79, GOST 21996−76, GOST 21997−76, GOST 10234−77, GOST 19039−73. Strip GOST 103−76, GOST 4405−75. Wire GOST 11850−72. Forgings and forged billets GOST 1133−71.
Application
springs, springs, thrust washers, brake bands, friction discs, gears, flanges, bearing housings, clamping and feed collets and other parts that require increased wear resistance and parts that work without shock loads.

Chemical composition of steel 65G

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.90−1.20
Copper (Cu), no more 0.20
Nickel (Ni), no more 0.25
Sulfur (S), no more 0.035
Carbon (C) 0.62−0.70
Phosphorus (P), no more 0.035
Chromium (Cr), no more 0.25

Mechanical properties of 65G steel

Mechanical properties

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% HRC e
Steel categories: 3.3A, 3B, 3V, 3G, 4.4A, 4B. Hardening 830 ° С, oil, tempering 470 ° С. Samples 785 980 8 thirty  
Normalized and hot rolled sheets 80   730 12    
Hardening 800−820 ° C, oil. Vacation 340−380 ° С, air. 20 1220 1470 five ten 44−49
Hardening 790−820 ° С, oil. Vacation 550−580 ° С, air. 60 690 880 8 thirty 30−35

Mechanical properties at elevated temperatures

test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,% ψ,%
Hardening 830 ° С, oil. Vacation 350 ° C.
200 1370 1670 fifteen 44
300 1220 1370 19 52
400 980 1000 20 70

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HRC e
Hardening 830 ° С, oil.
200 1790 2200 4 thirty five 61
400 1450 1670 8 48 29 46
600 850 880 fifteen 51 76 thirty

Technological properties of steel 65G

Forging temperature
Beginning 1250, end 780−760. Cooling of workpieces with a section of up to 100 mm is carried out in air, sections of 101−300 mm — in a mold.
Weldability
not applicable for welded structures. KTS — no restrictions.
Machinability by cutting
In the quenched and tempered state at HB 240 and σ B = 820 MPa K υ tv.spl. = 0.85, K υ b.st. = 0.80.
Tendency to release ability
prone at Mn content> = 1%
Flock sensitivity
insensitive

Temperature of critical points of steel 65G

Critical point ° C
Ac1 721
Ac3 745
Ar3 720
Ar1 670
Mn 270

Impact strength of steel 65G

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 0 -20 -thirty -70
Tempering 830 C. Vacation 480 C. 110 69 27 23 12

Endurance limit of steel 65G

σ -1, MPa τ -1, MPa σ B, MPa σ 0.2, MPa Heat treatment, steel condition
725 431     Guenching 810 С, oil. Vacation 400 S.
480 284     Guenching 810 С, oil. Vacation 500 S.
578   1470 1220 HB 393−454
647   1420 1280 HB 420
725   1690 1440 HB 450

Hardenability of steel 65G

Hardening 800 ° C.

Distance from the end, mm / HRC e
1.5 3 4.5 6 nine 12 fifteen eighteen 27 39
58.5−66 56.5−65 53−64 49.5−62.5 41.5−56 38.5−51.5 35.5−50.5 34.5−49.5 35−47.5 31−45
Amount of martensite,% Crit. Diam. in water, mm Crit. Diam. in oil, mm Crete. hardness, HRCэ
50 30−57 10−31 52−54
90 Up to 38 Up to 16 59−61

Physical properties of steel 65G

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 215 213 207 200 180 170 154 136 128  
Torsional shear elastic modulus G, GPa 84 83 80 77 70 65 58 51 48  
Density of steel, pn, kg / m 3 7850 7830 7800   7730          
Thermal conductivity coefficient W / (m ° С) 37 36 35 34 32 31 thirty 29 28  
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) 11.8 12.6 13.2 13.6 14.1 14.6 14.5 11.8    
Specific heat (C, J / (kg ° C)) 490 510 525 560 575 590 625 705    

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