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Steel 30KHGT

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 30KHGT

Steel 30HGT: 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 grade — Steel 30HGT.

General information about steel 30HGT

Substitute brand
Steel: 18ХГТ, 20ХН2М, 25ХГТ, 12Х2Н4А.
Delivery type
Long products, including shaped: GOST 4543−71, GOST 259071, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78, GOST 1051−73. Polished bar and silver bar GOST 14955−77. Strip GOST 103−76. Forgings and forged billets GOST 1133−71, GOST 8479−70, GOST 4543−71.
Application
Improved and cemented parts that require high core strength and toughness, as well as high surface hardness, operating at high speeds and higher unit pressures under shock loads.

Chemical composition of steel 30HGT

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.80−1.10
Copper (Cu), no more 0.30
Nickel (Ni), no more 0.30
Sulfur (S), no more 0.035
Titanium (Ti) 0.03−0.09
Carbon (C) 0.24−0.32
Phosphorus (P), no more 0.035
Chromium (Cr) 1.00−1.30

Mechanical properties of steel 30HGT

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB HRC e
Bar. Normalization 880−950 ° C. Hardening 850 ° С, oil. Vacation 200 ° C, water or oil.
Samples 1270 1470 nine 40 59    
Forgings. Hardening. Vacation
<100 685 835 thirteen 42 59 262−311  
Cementation 920−950 ° C. Hardening 840−860 ° С, oil. Vacation 180−200 ° C, air.
<60 780 1080 12 35 59 300 57−63
100 730 880 12 35 59 270 57−63
150 690 830 12 thirty 49 240 57−63

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 850 ° C.
200 1420 1680 ten 53   50
300 1270 1520 nine 52 69 48
400 1180 1370 8 55 59 44
500 980 1080 eleven 59 98 38
600 760 930 19 65 147 32

Mechanical properties depending on the section

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HRC e
Hardening 850 ° С, oil. Vacation 200 ° C, air.
five 1420 1620 12 50 63  
fifteen 1180 1420 thirteen 50 64 45
20 930 1180 fourteen 50 81 38
25 830 1130 17 45 83 34

Technological properties of steel 30HGT

Forging temperature
Beginning 1220, end 800. Sections up to 200 mm are cooled in ash pans, over 200 mm in furnaces.
Weldability
restrictedly weldable. Welding methods: RDS, KTS. Heating and subsequent heat treatment is recommended.
Machinability by cutting
After normalization at HB 364 and σ B = 860 MPa K υ tv.spl. = 0.45, K υ b.st. = 0.25.
Tendency to release ability
inclined
Flock sensitivity
not sensitive

Temperature of critical points of steel 30HGT

Critical point ° C
Ac1 770
Ac3 825
Ar3 740
Ar1 665

Impact strength of steel 30HGT

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -20 -40 -60
Hardening 850 С, oil. Vacation 200 С, air 61 57 56 54

Endurance limit of steel 30HGT

σ -1, MPa τ -1, MPa σ B, MPa σ 0.2, MPa Heat treatment, steel condition
490 294 980 780 Section 60 mm, HB 300
461 274 920 730 Section 120 mm, HB 270−300
441 265 870 700 Section 150 mm, HB 240−270

Hardenability of steel 30HGT

Hardening 880 C. Hardness for strips of hardenability HRCe.

Distance from the end, mm / HRC e
1.5 3 4.5 6 nine 12 fifteen eighteen 21 24
43−53 42−52 40.5−51.5 38.5−50.5 34.5−48 30.5−44.5 28−41.5 25−39 23−37.5 35.5
Amount of martensite,% Crit. Diam. in water, mm Crit. Diam. in oil, mm Crete. hardness, HRCэ
50 35−75 14−46 37−41
90 12−47 4−24 42−47

Physical properties of steel 30HGT

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 212 202 195 189 174 169 157 138 132  
Torsional shear elastic modulus G, GPa 83 79 76 74 67 66 61 53 51  
Thermal conductivity coefficient W / (m ° С) 36 37 36 34 33 31 29 28 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) 10.5 12.0 12.7 13.3 13.8 14.0        
Specific heat (C, J / (kg ° C)) 495 508 525 537 567 588 626 705    

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