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Steel 40KH2N2MA

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 40KH2N2MA

Steel 40Х2Н2МА: 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 40X2H2MA.

General information about steel 40X2H2MA

Substitute brand
steel 38Х2Н2МА.
Delivery type
Long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78. 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
Large products: shafts, discs, gears and fasteners.

Chemical composition of 40Kh2N2MA steel

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.30−0.60
Copper (Cu), no more 0.30
Molybdenum (Mo) 0.20−0.30
Nickel (Ni) 1.35−1.75
Sulfur (S), no more 0.025
Carbon (C) 0.35−0.42
Phosphorus (P), no more 0.025
Chromium (Cr) 1.25−1.65

Mechanical properties of steel 40X2H2MA

Mechanical properties

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Bar. Hardening 870 ° С, oil. Vacation 600 ° C, water or oil.
  25 930 1080 ten 45 78  
Forgings. Hardening. Vacation
KP 590 300−500 590 735 12 35 44 235−277
KP 640 300−500 640 785 eleven 33 44 248−293
KP 735 <100 735 880 thirteen 40 59 277−321

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% HB
Oil quenching.
400 1230 1400 12 49 430
500 1090 1200 sixteen 60 350
600 850 950 20 62 280

Mechanical properties depending on the section

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 10 ,% KCU, J / m 2
Hire. Hardening 950 ° С, oil. Vacation 580−600 ° C.
Sample cutting location — center 500 760 930 fifteen 57
Sample cutting location — edge 500 770 960 17 53
The sample is cut in the center. Cross samples 500 740 930 eleven 23
The sample was cut out at the edge. Cross samples 500 760 930 eleven 22
Sample cutting location — center 700 740 900 17 45
Sample cutting location — edge 700 740 930 17  
The sample is cut in the center. Cross samples 700 790 900   fifteen
The sample was cut out at the edge. Cross samples 700 730 880 eleven 27
Sample cutting location — center 900 710 850 7 26
Sample cutting location — edge 900 700 890 sixteen 46
The sample is cut in the center. Cross samples 900 690 730   20
The sample was cut out at the edge. Cross samples 900 700 870 eleven 24

Technological properties of steel 40X2H2MA

Forging temperature
Beginning 1200, end 800. Sections up to 100 mm are cooled in air, 101−350 mm — in a pit.
Weldability
difficult to weld. Welding method: RDS. Heating and subsequent heat treatment is required.
Tendency to release ability
not inclined
Flock sensitivity
sensitive

Temperature of critical points of steel 40X2H2MA

Critical point ° C
Ac1 740
Ac3 805

Impact strength of steel 40X2H2MA

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -20 -40 -60
Tempering 880 C, oil. Vacation 200 С, oil. 50 41 36 35
Tempering 820 С, oil. Vacation 600 С, water 139 122 128 125
b0.2 = 780 MPa, bw = 970 MPa, b5 = 20%, y = 61% 120   105 85

Endurance limit of steel 40X2H2MA

σ -1, MPa n σ B, MPa σ 0.2, MPa Heat treatment, steel condition
520     1080 Tempering 890 C. Vacation 580 C, water.
  1E + 6 1200    

Hardenability of steel 40Х2Н2МА

Tempering 845 C.

Distance from the end, mm / HRC e
1.5 3 five nine thirteen 20 25 thirty 40 50
51.5−59 51.5−59 50.5−59 49.5−58 49.5−58 47.5−57 46.5−57 45.5−56 44.5−56 42.5−56
Amount of martensite,% Crit. Diam. in oil, mm
50 115
90 100

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