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Steel 12ХН3А

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 12ХН3А

Steel 12ХН3А: 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 12XN3A.

General information about steel 12ХН3А

Substitute brand
steel: 12ХН2, 20ХН3А, 25ХГТ, 12Х2Н4А, 20ХНР.
Delivery type
Circle 12хн3а, long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 10702−78. Calibrated bar GOST 10702−78, GOST 1051−73, 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. Pipes GOST 21729−76, GOST 8734−75, GOST 9567−75.
Application
Gears, shafts, worms, cam couplings, piston pins and other cemented parts that require high strength, ductility and toughness of the core and high surface hardness, operating under shock loads and at negative temperatures.

Chemical composition of steel 12ХН3А

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.30−0.60
Copper (Cu), no more 0.30
Nickel (Ni) 2.75−3.15
Sulfur (S), no more 0.025
Carbon (C) 0.09−0.16
Phosphorus (P), no more 0.025
Chromium (Cr) 0.60−0.90

Mechanical properties of steel 12ХН3А

Mechanical properties at elevated temperatures

test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Samples with a diameter of 28−50 mm. Annealing 880−900 ° C. Hardening 860 ° C, oil. Vacation 600 ° С, 3 h.
20 540 670 21 75 274
200 520 630 20 74 216
300 500 630 12 70 211
400 430 530 20 75 181
500 390 410 19 86 142
550 240 260 21 82  
Sample 10 mm in diameter and 50 mm long, forged and annealed. Deformation rate 5 mm / min. Strain rate 0.002 1 / s.
700 70 140 41 78  
800 29 89 61 97  
900 27 68 58 100  
1000 23 44 63 100  
1100 23 43 73 100  
1200 12 25 70 100  
1250 ten eighteen 67 100  

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
Billets with a diameter of 70 mm. Hardening 800 ° C, oil.
200 1270 1370 12 60 98 400
300 1130 1270 thirteen 68 78 380
400 1080 1200 fourteen 68 83 375
500 930 1030 19 70 118 280
600 670 730 24 75 167 230

Mechanical properties depending on the section

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HRC e
False lementation at 910 ° C, 9 h. Hardening at 810 ° C, oil. Vacation 200 ° C, in the air
ten 1080 1220 thirteen 60 157 35
fifteen 780 980 sixteen 65 152 32
20 730 880 sixteen 70 165 thirty
25 640 830 20 70 192 28

Mechanical properties of the bar

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB HRC e
Hardening 860 ° C, water or oil. Hardening 760−810 ° C, water or oil. Vacation 180 ° C, air or oil.
fifteen 685 930 eleven 55 88    
Cementation 920−950 ° C. Hardening 800−820 ° C, oil. Vacation 160−200 ° С, air.
60 830 980 12 55 118 303 59−64
100 690 830 ten 50 78 250 57−63

Technological properties of steel 12ХН3А

Forging temperature
Beginning 1220, end 800. Sections up to 100 mm are cooled in air, 101−300 mm — in a pit.
Weldability
limited. RDS, ADS under flux.
Machinability by cutting
In hot-rolled condition at HB 183−187 K υ tv.spl. = 1.26, K υ b.st. = 0.95.
Tendency to release ability
inclined
Flock sensitivity
sensitive

Temperature of critical points of steel 12ХН3А

Critical point ° C
Ac1 715
Ac3 773
Ar3 726
Ar1 659
Mn 380

Impact strength of steel 12ХН3А

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -40
A bar with a section of 10 mm. Hardening 850 С, oil. Vacation 200 C, 1 hour HRCэ 37 127 103
A bar with a section of 10 mm. Gas carburizing 910 C, 3 h. Quenching 810 C, oil. Vacation 200 С, 1 hour HRCэ 58. 42 fourteen

Endurance limit of steel 12ХН3А

σ -1, MPa τ -1, MPa n σ B, MPa σ 0.2, MPa Heat treatment, steel condition
382     960 680 HB 323
338 230   730 610 HB 238
382−461 216−255 1E + 6 690    
441 245   910    

Hardenability of steel 12ХН3А

Tempering 840 C.

Distance from the end, mm / HRC e
1.5 3 4.5 6 7.5 nine 12 fifteen 21 27
38.5−43 37−43 35−42 31.5−41 25−40.5 22−38.5 35 32 28.5 26.5
Amount of martensite,% Crit. Diam. in water, mm Crit. Diam. in oil, mm
50 32−65 20−50
95 18−29 10−17

Physical properties of steel 12ХН3А

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 200                  
Density of steel, pn, kg / m 3 7850 7830 7800 7760 7720 7680 7640      
Thermal conductivity coefficient W / (m ° С)   31     26          
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) 11.8 13.0 14.0 14.7 15.3 15.6        
Specific heat (C, J / (kg ° C))       528 540 565        

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