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Steel 30KHGS

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 30KHGS

Steel 30KhGS: 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 30HGS.

General information about steel 30HGS

Substitute brand
Steel 40KHFA, 35KHM, 40KHN, 35KHGSA.
Delivery type
Long products, including shaped: GOST 4543−71, GOST 259071, GOST 2591−71. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78, GOST 1051−73. Polished bar and silver bar GOST 4543−71, GOST 14955−77. Thin sheet 1542−71. Strip GOST 103−76. Forgings and forged billets GOST 1133−71, GOST 8479−70. Pipes OST 14−21−77.
Application
Various upgradable parts: shafts, axles, gear wheels, brake bands of motors, flanges, casing housings, compressor blades, levers, pushers, critical welded structures operating under alternating loads, fasteners.

Chemical composition of steel 30HGS

Chemical element %
Silicon (Si) 0.90−1.20
Manganese (Mn) 0.80−1.10
Copper (Cu), no more 0.30
Nickel (Ni), no more 0.30
Sulfur (S), no more 0.035
Carbon (C) 0.28−0.35
Phosphorus (P), no more 0.035
Chromium (Cr) 0.80−1.10

Mechanical properties of steel 30HGS

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HRC e
Hardening 880 ° С, oil. Vacation 540 ° C, water or oil 25 830 1080 ten 45 44  
Forgings. Normalization. KP 395 <100 395 615 17 45 59  
Hardening 860−880 ° С, oil. Vacation 200−250 ° С, air. thirty 1270 1470 7 40   43−51
Hardening 860−880 ° С, oil. Vacation 540−560 ° C, water or oil. 60 690 880 nine 45 59  

Mechanical properties at elevated temperatures

test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Hardening 880 ° С, oil. Vacation 560 ° С, air.
20 950 1050 thirteen 56 52
250 840 1000 thirteen 48 126
300 820 950 eleven 50 124
400 780 900 sixteen 69 94
500 650 690 21 84 72
Sample 5 mm in diameter and 25 mm long. Laminated. Strain rate 2 mm / min, strain rate 0.0013 1 / s
700   175 59 51  
800   85 62 75  
900   53 84 > 90  
1000   37 71 > 90  
1100   21 59 > 90  
1200   ten 85 > 90  

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Bar with a diameter of 20−70 mm. Hardening 880 ° С, oil.
200 1570 1700 eleven 44 88
300 1520 1630 eleven 54 69
400 1320 1420 12 56 49
500 1140 1220 fifteen 56 78
600 940 1040 19 62 137

Mechanical properties depending on the section

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Hardening 880 ° С, oil. Vacation 600 ° C, water.
40 820 930 12 51 69 275
80 730 860 fourteen 50 78 250
120 670 820 fourteen 50 78 235
160 580 750 fourteen 50 78 210
180 510 710 thirteen 45 49 200

Technological properties of steel 30HGS

Forging temperature
Beginning 1240, end 800. Sections up to 50 mm are cooled in stacks in air, 51−100 mm — in boxes.
Weldability
restrictedly weldable. Welding methods: RDS, ADS submerged arc and gas shielded, ArDS, EShS. Heating and subsequent heat treatment is recommended, KTS without restrictions.
Machinability by cutting
In the hot-rolled state at HB 207−217 σ B = 710 MPa K υ tv.spl. = 0.85, K υ b.st. = 0.75.
Tendency to release ability
inclined
Flock sensitivity
sensitive

Temperature of critical points of steel 30HGS

Critical point ° C
Ac1 760
Ac3 830
Ar3 705
Ar1 670
Mn 352

Impact strength of steel 30HGS

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -20 -40 -60 -80
Tempering 880 C, oil. Vacation 580−600 C, bw = 1000 MPa. 69 55 41 34 23

Endurance limit of steel 30HGS

σ -1, MPa τ -1, MPa n σ B, MPa Heat treatment, steel condition
696       Tempering 870 C. Tempering 200 C
637       Tempering 870 C. Tempering 400 C
470       Tempering 870 C. Tempering 600 C
490 1666 1E + 7 1660 Quenching 870−890 C. Tempering 200 C
372 882 1E + 7 880 Quenching 870−890 С. Tempering 600 С

Hardenability of steel 30HGS

Hardening 800 C. Hardness for hardenability strips HRCe.

Distance from the end, mm / HRC e
1.5 3 4.5 6 nine 12 fifteen eighteen 21 24
50.5−55 49−54 47.5−53 46−52.5 41.5−52 38−51 36.5−48.5 35.5−46.5 33−44.5 30−43
Amount of martensite,% Crit. Diam. in water, mm Crit. Diam. in oil, mm Crete. hardness, HRCэ
50 60−91 34−60 37−42
90 40−68 18−40 43−48

Physical properties of steel 30HGS

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 194 185 173 169 166 156        
Torsional shear elastic modulus G, GPa 84 82 79 75 71 66 62 54 47  
Density of steel, pn, kg / m 3 7850 7830 7800 7760 7730 7700 7670      
Thermal conductivity coefficient W / (m ° С)   37 41 38 37 36 35 34 32  
Ud. electrical resistance (p, Nom. m) 210                  
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) 12.0 12.5 12.9 13.2 13.6 13.9        
Specific heat (C, J / (kg ° C)) 493 504 512 533 554 584 622 693    

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