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Steel 38KHMA

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 38KHMA

Steel 38KhMA: 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 brand — Steel 38XMA.

General information about steel 38ХМА

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 4543−71, GOST 14955−77. Strip GOST 103−76. Forgings and forged billets GOST 1133−71, GOST 4543−71.
Application
General purpose critical parts in mechanical engineering.

Chemical composition of 38KhMA steel

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.35−0.65
Copper (Cu), no more 0.30
Molybdenum (Mo) 0.20−0.30
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) 0.90−1.30

Mechanical properties of steel 38XMA

Mechanical properties

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Bar. Hardening 850 ° С, oil. Vacation 580 ° С, air. 25 885 980 eleven 45 69

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 ° С, oil.
200 1600 1860 ten 42 44 61
300 1470 1670 ten 40 39 51
400 1270 1420 ten 41 39 42
500 1130 1250 thirteen 48 80 38
600 860 980 eighteen 58 135 thirty

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
Hardening 850 ° С, oil. Vacation 600 ° C, air.
Sample cutting location — center thirty 880 1000 eighteen 57 103
Sample cutting location — center 200 590 770 19 55 64
Sample cutting location — edge 200 660 850 eighteen 56 62
Hardening 850 ° C, water. Vacation 600 ° C, air.
Sample cutting location — center 80 880 1030 fifteen 51 62
Sample cutting location — center 120 710 910 17 51 94
Sample cutting location — center 160 680 860 17 57 62
Sample cutting location — edge 160 820 950 17 57 104
Sample cutting location — center 200 630 800 eighteen 54 71
Sample cutting location — edge 200 800 940 sixteen 59 79

Temperature of critical points of steel 38XMA

Critical point ° C
Ac1 758
Ac3 805
Ar3 725
Ar1 650

Impact strength of 38KhMA steel

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -20 -40 -60
Hardening 850 С, oil. Vacation 550 С, air 63 67 59 53

Endurance limit of steel 38HMA

σ -1, MPa n Heat treatment, steel condition
323 6E + 5 Quenching with high tempering.

Short-term thermal strength of 38KhMA steel

Test temperature, ° С s 0.2, MPa σ B, MPa d 5 ,% y,%
100 890 990 12 59
200 850 970 thirteen 59
300 800 950 fifteen 59
400 730 840 sixteen 62
500 630 670 eighteen 72
600 390 440 22 88

Physical properties of steel 38XMA

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 211 201 194 184 174 169 166 141 129  
Torsional shear elastic modulus G, GPa 84 80 78 73 69 65 62 55 48  
Thermal conductivity coefficient W / (m ° С) 33 35 38 39 36 34 33 31 27  
Ud. electrical resistance (p, Nom. m) 257 280 310 380 470 580 720 870 1060  
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) 12.4 13.1 13.7 14.2 14.5 14.6 14.7 11.2    
Specific heat (C, J / (kg ° C)) 496 508 525 538 567 600 672 697    

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