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Steel 38KHGN

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 38KHGN

Steel 38KHGN: brand of steels and alloys. Below is a systematized information about the purpose, chemical composition, types of supplies, substitutes, temperature of critical points, physical, mechanical, technological and casting properties for the brand — Steel 38HGN.

General information about steel 38HGN

Substitute brand
steel 38HGNM.
Delivery type
Long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar 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. Pipes OST 14−21−77.
Application
Excavator parts, fasteners, shafts, axles, gear wheels, shackles and other critical parts that require increased strength.

Chemical composition of steel 38HGN

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.80−1.10
Copper (Cu), no more 0.30
Nickel (Ni) 0.70−1.00
Sulfur (S), no more 0.035
Carbon (C) 0.35−0.43
Phosphorus (P), no more 0.035
Chromium (Cr) 0.50−0.80

Mechanical properties of steel 38HGN

Mechanical properties

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% HB HRC e
Bar. Hardening 850 ° С, oil. Vacation 570 ° C, water or oil.
  25 685 780 12 45    
Forgings. Hardening. Vacation.
KP 315 300−500 315 570 12 thirty 167−207  
Normalization
KP 315 500−800 315 570 eleven thirty 167−207  
KP 345 <100 345 590 eighteen 45 174−217  
Hardening. Vacation
KP 345 300−500 345 590 fourteen 38 174−217  
KP 345 500−800 345 590 12 33 174−217  
KP 395 100−300 395 615 fifteen 40 187−229  
KP 395 300−500 395 615 thirteen 35 187−229  
KP 395 500−800 395 615 eleven thirty 187−229  
KP 440 <100 440 635 sixteen 45 197−235  
KP 440 300−500 440 635 thirteen 35 197−235  
KP 490 <100 490 355 sixteen 45 212−248  
KP 490 100−300 490 355 thirteen 40 212−248  
KP 540 <100 540 385 fifteen 45 223−262  
KP 540 100−300 540 385 thirteen 40 223−262  
KP 590 <100 590 735 fourteen 45 235−277  
Hardening 850−870 ° С, oil. Vacation 180−200 ° C, air.
  40 1340 1470 7 thirty   50−53
Hardening. Vacation 650 ° C.
  100 690 880   60 241  

Mechanical properties at elevated temperatures

test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,% ψ,%
Sample 10 mm in diameter, 50 mm long, forged and annealed. The deformation rate is 5 mm / min, the deformation rate is 0.002 1 / s.
700 185 200 34 93
800 89 135 57 98
900 52 76 68 100
1000 27 50 75 100
1100 eighteen 35 66 100
1200 ten 20 66 100

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
Hardening 850 ° С, oil.
200 1580 1780 fifteen 36 28 499
300 1470 1670 sixteen 40 19 478
400 1290 1370 sixteen 41 47 415
500 1150 1200 sixteen 46 78 350
600 950 1040 19 54 157 269

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 HB
Hardening 850 ° C, water or oil. Vacation 560 ° С, water.
Sample cutting location — edge 250 700 850 fifteen 54 69 269
Sample cutting location — 1 / 3R 250 660 810 sixteen 51 64 255
Sample cutting location — center 250 700 860 17 48 59 241
Sample cutting location — edge 350 730 840 17 59 83 262
Sample cutting location — 1 / 3R 350 660 800 sixteen 50 54 255
Sample cutting location — center 350 690 870 fourteen 43 49 248
Sample cutting location — edge 450 730 890 fifteen 54 73 262
Sample cutting location — 1 / 3R 450 690 840 fifteen 47 49 248
Sample cutting location — center 450 590 810 fifteen 32 35 235
Quenching 850 ° C, through water into oil. Vacation 560 ° С, 10 hours water.
Sample cutting location — edge 550 800 930 sixteen 52 69 275
Sample cutting location — 1 / 3R 550 660 870 fourteen 52 54 275
Sample cutting location — center 550 490 730 fifteen thirty 60 229

Technological properties of steel 38HGN

Forging temperature
Beginning 1200, end 800. Sections up to 250 mm are cooled in air, 251−350 mm — in a pit.
Weldability
difficult to weld. Welding method: RDS. Heating and subsequent heat treatment are required.
Machinability by cutting
After quenching and tempering at HB 187−236 and σ B = 640 MPa K υ tv.spl. = 1.0, K υ b.st. = 0.9.
Tendency to release ability
inclined
Flock sensitivity
sensitive

Temperature of critical points of steel 38HGN

Critical point ° C
Ac1 725
Ac3 830
Ar3 690
Ar1 600
Mn 320

Impact strength of steel 38HGN

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -20 -40 -60
Section 200 mm. Quenching through water in air and again in water (water 2−4 min, air 1−2 min, water 2−4 min). Vacation 620−640 С. 98 70 63 46
Hardening 850 C. Vacation 650 C. 178 169 127 92

Endurance limit of steel 38HGN

σ -1, MPa σ B, MPa Heat treatment, steel condition
440 840 Tempering 840 C, oil. Vacation 580 C.

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