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Steel 30KHGSA

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 30KHGSA

Steel 30HGSA: 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 30HGSA.

General information about steel 30HGSA

Substitute brand
Steels: 40KhFA, 35KhM, 40KhM, 25KhGSA, 35KhGSA.
Delivery type
Sheet 30khgsa, pipe 30khgsa, circle 30khgsa, wire 30khgsa, hexagon 30khgsa, rolled sections, including shaped: GOST 4543−71, GOST 259071, GOST 2591−71, GOST 2879−69, GOST 10702−78. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78, GOST 10702−78, GOST 1051−73. Polished bar and silver bar GOST 14955−77. Thick sheet GOST 11269−76. Thin sheet GOST 11268−76. Strip GOST 103−76. Forgings and forged billets GOST 1133−71, GOST 8479−70. Pipes GOST 8731−87, GOST 8732−78, GOST 8733−87, GOST 8734−75, GOST 21729−76, GOST 13663−68, GOST 9567−75.
Application
Various upgradable parts: shafts, axles, gear wheels, flanges, casing housings, compressor blades operating at temperatures up to 200 ° C, levers, pushers, critical welded structures operating under alternating loads, fasteners operating at low temperatures.

Chemical composition of steel 30HGSA

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 0.025
Carbon (C) 0.28−0.34
Phosphorus (P), no more 0.025
Chromium (Cr) 0.80−1.10

Mechanical properties of steel 30HGSA

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB HRC e
Bar. Hardening 880 ° С, oil Vacuuming 540 ° С, water or oil.
  25 830 1080 ten 45 49    
Forgings. Hardening. Vacation.
KP 490 <100 490 655 sixteen 45 59 212−248  
KP 490 100−300 490 655 thirteen 40 54 212−248  
KP 540 <100 540 685 fifteen 45 59 223−262  
KP 590 <100 590 735 fourteen 45 59 235−277  
KP 590 100−300 590 735 thirteen 40 49 235−277  
KP 640 <100 640 785 thirteen 42 59 248−293  
KP 675 <100 675 835 thirteen 42 59 262−311  
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 59 225  

Mechanical properties at elevated temperatures

test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Bar. Hardening 880 ° С, oil. Vacation 560 ° C.
300 820 980 eleven 50 127
400 780 900 sixteen 69 98
500 640 690 21 84 78
550 490 540 27 84 64
Sample 5 mm in diameter, 25 mm long, rolled. Deformation 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 HB
Diameter 20−70 mm, hardened 880 ° C, oil. After tempering, cooling in water.
200 1570 1700 eleven 44 88 487
300 1520 1630 eleven 54 69 470
400 1320 1420 12 56 49 412
500 1140 1220 fifteen 56 78 362
600 940 1040 19 62 137 300

Mechanical properties depending on the section

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Hardening 880 ° С, oil. Vacation 600 ° C, water.
thirty 880 1000 12 50 69
50 760 880 12 50 69
80 740 860 fourteen 50 78
120 670 820 fourteen 50 78
160 590 740 fourteen 50 78
200 530 720 fourteen 45 59
240 490 710 fourteen 45 59

Technological properties of steel 30HGSA

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 and 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 30HGSA

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

Impact strength of steel 30HGSA

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 35 23

Endurance limit of steel 30HGSA

σ -1, MPa τ -1, MPa n σ B, MPa Heat treatment, steel condition
490 1666 1E + 7 1670  
372 882 1E + 7 880  
470   1E + 6 1080  
696       Tempering 870 C. Tempering 200 C
637       Tempering 870 C. Tempering 400 C

Hardenability of steel 30HGSA

Hardness HRCэ.

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 36−48.5 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 38−43
90 40−68 18−40 43−48

Physical properties of steel 30HGSA

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 215 211 203 196 184 173 164 143 125  
Density of steel, pn, kg / m 3 7850 7830 7800 7760 7730 7700 7670      
Thermal conductivity coefficient W / (m ° С) 38 38 37 37 36 34 33 31 thirty  
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) 11.7 12.3 12.9 13.4 13.7 14.0 14.3 12.9    
Specific heat (C, J / (kg ° C)) 496 504 512 533 554 584 622 693    

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