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Steel 34ХН3М

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 34ХН3М

Steel 34ХН3М: 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 34HN3M.

General information about steel 34ХН3М

Substitute brand
steel: 35ХНВ, 35ХГНМ, 38Х2НМ, 34ХН1М, 34ХН3МА, 34ХН3МЗА.
Delivery type
Forgings and forged billets GOST 8479−70.
Application
Particularly critical parts with high requirements for mechanical properties are large.

Chemical composition of steel 34ХН3М

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.50−0.80
Molybdenum (Mo) 0.25−0.40
Nickel (Ni) 2.75−3.25
Sulfur (S), no more 0.035
Carbon (C) 0.30−0.40
Phosphorus (P), no more 0.030
Chromium (Cr) 0.70−1.10

Mechanical properties of steel 34ХН3М

test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Bar. Hardening 850−870 ° С, oil. Vacation 690 ° С, 5 h. Hardening 850−870 ° С, oil. Vacation 630−650 ° C, 1.5−2 hours of air.
20 860 960 19 49 127
200 760 900 sixteen 60 149
300 720 910 17 56  
400 700 860 21 70 145
500 540 610 eighteen 75 101
600 460 480 25 89 109
700 160 180 47 96  
Bar. Hardening 850−870 ° C, malso. Vacation 690 ° С, 5 h.
20 530 850 17 49 81
400 500 720 22 68  
500 470 600 24 76 78
600 320 350 32 91 96
Sample 6 mm in diameter, 30 mm long, forged. Deformation rate 16 mm / min. Strain rate 0.009 1 / s.
835 87 145 62 98  
925 51 91 67 98  
1025 36 66 72 100  

Mechanical properties of forgings

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Normalization
KP 640 100−300 640 785 12 38 49 248−293
Hardening. Vacation
KP 640 300−500 640 785 eleven 33 44 248−293
KP 640 500−800 640 785 ten thirty 39 248−293
Normalization
KP 685 <100 685 835 thirteen 42 59 262−311
KP 685 100−300 685 835 12 38 49 262−311
KP 685 300−500 685 835 eleven 33 39 262−311
Hardening. Vacation
KP 685 500−800 685 835 ten thirty 39 262−311
Normalization
KP 735 <100 735 880 thirteen 40 59 277−321
KP 735 100−300 735 880 12 35 49 277−321
Hardening. Vacation.
KP 735 300−500 735 880 eleven thirty 39 277−321
KP 735 500−800 735 880 eleven thirty 39 277−321

Technological properties of steel 34ХН3М

Forging temperature
Beginning 1240, end 780. Sections up to 100 mm are cooled in air, 101−350 mm — in a pit.
Weldability
restrictedly weldable. Welding method: RDS, EShS. Heating and subsequent heat treatment are required.
Machinability by cutting
In the annealed state at HB 210−230 σ B = 640 MPa K υ tv.spl. = 0.8.
Tendency to release ability
not inclined
Flock sensitivity
hypersensitive

Temperature of critical points of steel 34ХН3М

Critical point ° C
Ac1 720
Ac3 790
Ar3 490

Impact strength of steel 34ХН3М

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -20 -40 -60
Hardening 850−870 C, oil. Vacation 610−620 С. 105 64 72 72

Endurance limit of steel 34ХН3М

σ -1, MPa n σ B, MPa σ 0.2, MPa Heat treatment, steel condition
397 1E + 7 1010 850 HB 293−311
358   800 550 Normalization 850−870 С, air. HB 220−230
426   980 840 Hardening 840−860 C, oil. Vacation 580−620 С. НВ 290−310.

Hardenability of steel 34ХН3М

Hardening 870 ° C.

Distance from the end, mm / HRC e
1.5 6 12 eighteen thirty 48
52−54 49−51.5 48.5−51 48.5−51 48.5−51 48.5−51

Physical properties of steel 34ХН3М

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 207 203 198 192 182 173        
Torsional shear elastic modulus G, GPa 79 79     69 59        
Density of steel, pn, kg / m 3 7830 7810 7780   7710   7650      
Thermal conductivity coefficient W / (m ° С)   36 37 37 37 35 31 28   27
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) 10.8 11.6 12.5 13.3 13.5 13.7        

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