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Steel 12ХН2А

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 12ХН2А

Steel 12ХН2А: 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 grade — Steel 12XN2A.

General information about steel 12ХН2А

Substitute brand
steel: 20ХНР, 20ХГНР, 12ХН3А, 18ХГТ, 20ХGR.
Delivery type
Cellular products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 1051−73, GOST 8559−75, GOST 8560−78. Polished bar and silver bar GOST 4543−71, GOST 14955−77. Strip GOST 103−76. Forgings and forged billets GOST 4543−71, GOST 1133−71. Pipes GOST 8739−87, GOST 5732−78, GOST 9567−75, OST 14−21−77.
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 12ХН2А

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.30−0.60
Copper (Cu), no more 0.30
Nickel (Ni) 1.50−1.90
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 12ХН2А

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB HRC e
Bar. Hardening 860 ° C, water or oil. Zakakla 760−810 ° C, water or oil. Vacation 180 ° C, air or oil. fifteen 590 780 12 50 88    
Hot-deformed heat-treated pipes   392 539 fourteen        
Cementation 920−950 ° C. Hardening 790−810 ° С, oil. Vacation 180−200 ° C, air. 100 590 780 12 45 69 249 57−63
Cyanidation 840−860 ° C. Hardening 840−860 ° С, oil. Vacation 180−200 ° C, air. 60 590 780 12 50 88 229 57

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 880 ° С, oil. Vacation 600 ° C, water.
Sample cutting location — center thirty 420 550 29 79 363
Sample cutting location — center 50 400 550 31 78 363
Sample cutting location — center 100 370 510 thirty 76  
Sample cutting location — edge 100 390 530 33 77  
Hardening 880 ° C, through water to oil. Vacation 600 ° C, water.
Sample cutting location — center 50 450 600 28 77 363
Sample cutting location — center 100 390 540 29 77  
Sample cutting location — edge 100 420 550 thirty 77  

Technological properties of steel 12ХН2А

Forging temperature
Beginning 1250, end 800. Sections up to 100 mm are cooled in air, 101−300 mm — in a mold.
Weldability
restrictedly weldable. RDS, ADS under flux.
Tendency to release ability
inclined
Flock sensitivity
not sensitive

Temperature of critical points of steel 12ХН2А

Critical point ° C
Ac1 715
Ac3 773
Ar3 726
Ar1 659
Mn 405

Impact strength of steel 12ХН2А

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -40 -50
Section 30 mm. Guenching 860 C, oil. Vacation 530 С, water. 353 323 206
Section 100 mm. Place of cutting of samples — edge. Tempering 880 C, oil. Vacation 530 С, water 323 265 304
Section 100 mm. Place of cutting of samples — center. Tempering 880 C, oil. Vacation 530 С, water 314 304  
Section 10 mm. Gas carburizing 910 C, 3 h. Quenching 810 C, oil. Vacation 200 С, 1 h. 49 8  

Endurance limit of steel 12ХН2А

σ -1, MPa n σ B, MPa Heat treatment, steel condition
323 1E + 6 740 Tempering 820 С, oil. Vacation 580 C.

Hardenability of steel 12ХН2А

Hardening 900 C. Hardness HRCэ.

Distance from the end, mm / HRC e
1.5 3 4.5 6 nine 12 fifteen
35.5 32 29 27 23 20 19
Amount of martensite,% Crit. Diam. in water, mm Crit. Diam. in oil, mm
50 40 25

Physical properties of steel 12ХН2А

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 211 203 196 190 176 172 154 141 130  
Torsional shear elastic modulus G, GPa 95 80 76 71 69 67 60 55 50  
Density of steel, pn, kg / m 3 7880                  
Thermal conductivity coefficient W / (m ° С) 38 38 37 35 33 31 thirty 29 29  
Ud. electrical resistance (p, Nom. m) 330 360 430 520 590 670     1050 1120
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) 10.5 11.5 11.9 12.4 12.9 13.6 13.9 11.7    
Specific heat (C, J / (kg ° C)) 486 498 514 533 555 584 636 703 703 695

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