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Steel 38XA

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 38XA

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

General information about steel 38XA

Substitute brand
steel: 40X, 35X, 40XH.
Delivery type
Long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 10702−78. Calibrated bar GOST 7414−75, GOST 8559−75, GOST 8560−78, GOST 1051−73. Polished bar and silver bar GOST 14955−77. Thick sheet GOST 1577−81, GOST 19903−74. Strip GOST 82−70, GOST 103−76. Forgings and forged billets GOST 1131−71.
Application
worms, gear wheels, gears, shafts, axles, critical bolts and other upgradable parts.

Chemical composition of steel 38XA

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.50−0.80
Copper (Cu), no more 0.30
Nickel (Ni), no more 0.30
Sulfur (S), no more 0.025
Carbon (C) 0.35−0.42
Phosphorus (P), no more 0.025
Chromium (Cr) 0.80−1.10

Mechanical properties of steel 38XA

Mechanical properties

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Bar. Hardening 860 ° C, oil. Vacation 550 ° C, water or oil 25 780 930 12 50 88

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 ° C, water.
400 1220 1310 7 38 54 380
500 930 1030 12 47 108 320
600 710 830 17 63 167 260

Mechanical properties depending on the section

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Forgings. Hardening 850 ° С, oil. Vacation 560 ° С, air.
100 540 690 fifteen 45 59 240−280
100−200 490 660 thirteen 40 54 230−270
200−300 440 640 fourteen 40 54 230−260

Mechanical properties versus test temperature

test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Bar with a diameter of 28−55 mm. Hardening 850 ° С, oil. Vacation 550 ° С, 3 h.
20 790 940 thirteen 55 83 285−302
300 680 880 17 58    
400 610 690 eighteen 68 98  
500 430 490 21 80 78  
Bar with a diameter of 28−55 mm. Hardening 830 ° С, oil. Vacation 680 ° С, 3 h.
20 570 700 26 60 216 207−217
400 430 590 19 71 211  
500 360 420 24 79 132  
600 210 245 32 89    
Bar with a diameter of 25 mm. Hardening 860 ° C, oil. Vacation 550 ° C.
-20 900 1040 eighteen 58    
-40 930 1100 eighteen 55 78  
-70 1000 1120 eighteen 55 59  

Technological properties of steel 38XA

Forging temperature
Beginning 1240, end 780.
Weldability
difficult to weld, fusion welding with preheating followed by heat treatment is recommended.
Machinability by cutting
σ B = 930 MPa K υ tv.spl. = 0.7, K υ b.st. = 0.8.
Tendency to release ability
inclined
Flock sensitivity
sensitive

Temperature of critical points of steel 38XA

Critical point ° C
Ac1 740
Ac3 780
Ar3 730
Ar1 693
Mn 250

Endurance limit of steel 38XA

σ -1, MPa σ B, MPa σ 0.2, MPa Heat treatment, steel condition
333 690   Hardening. Vacation.
392 980 830 HB 241
372 870    

Hardenability of steel 38XA

Hardness for strips HRCe.

Distance from the end, mm / HRC e
2.5 five 7.5 12.5 fifteen 20 25 35
51.5−60 49.5−59 44.5−57.5 34.5−51 32.5−47.5 31−42.5 30−39 28−37.5
 

Physical properties of steel 38XA

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 196                  
Torsional shear elastic modulus G, GPa 83                  
Density of steel, pn, kg / m 3 7850   7800       7650      
Thermal conductivity coefficient W / (m ° С)   50 46 42 40 37 35 31    
Ud. electrical resistance (p, Nom. m) 290                  
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) 12.7 13.1 13.5 13.8 14.2 14.6        

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