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Steel 12KH2N4A

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 12KH2N4A

Steel 12Х2Н4А: 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 12X2H4A.

General information about steel 12Х2Н4А

Substitute brand
steel: 20ХГНР, 12ХН2, 12ХН3А, 20Х2Н4А, 20ХGR.
Delivery type
12Х2н4а circle, long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar 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 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 12X2H4A

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.30−0.60
Copper (Cu), no more 0.30
Nickel (Ni) 3.25−3.65
Sulfur (S), no more 0.025
Carbon (C) 0.09−0.15
Phosphorus (P), no more 0.025
Chromium (Cr) 1.25−1.65

Mechanical properties of steel 12Х2Н4А

Mechanical properties at elevated temperatures

test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,% ψ,%
Sample 10 mm in diameter, 50 mm long, rolled. Deformation rate 20 mm / min. The strain rate is 0.007 1 / s.
800 99 115 35 91
900 64 80 56 96
1000 43 54 65 100
1100 31 42 64 100
1200 20 28 58 100
1250 fifteen 23 62 100

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa ψ,% KCU, J / m 2
Hardening 900 ° C, oil.
200 1240 1560 49 88
300 1320 1540 56 74
400 1200 1320 59 103
500 1130 1200 62 125

Mechanical properties depending on the section

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB HRC e
Hardening 850 ° С, oil. Vacation 200 ° C, air.
five 1080 1270 thirteen 60 105   39
fifteen 930 1080 fourteen 65 116   38
20 830 980 sixteen 70 147   37
25 780 930 17 70 162   36
Hardening 780 ° С, oil. Vacation 130 ° C, air.
20 980 1240 ten 63 196 375  
40 860 1180 eleven 64 172 355  
60 690 1080 thirteen 61 137 325  

Mechanical properties of the bar

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Hardening 860 ° C, oil. Hardening 760−800 ° С, oil. Vacation 180 ° C, air or oil. fifteen 930 1130 ten 50 88
Cementation 920−950 ° C. Hardening 780−800 ° С, oil. Vacation 180−200 ° C. 60 950 1200 ten 50 80

Technological properties of steel 12X2H4A

Forging temperature
Beginning 1220, end 800. Sections up to 100 mm are cooled in air, 101−300 mm — in a pit.
Weldability
restrictedly weldable. RDS, ADS under flux.
Machinability by cutting
at HB 183−187 K υ tv.spl. = 1.26, K υ b.st. = 0.96.
Tendency to release ability
inclined
Flock sensitivity
sensitive

Temperature of critical points of steel 12X2H4A

Critical point ° C
Ac1 745
Ac3 800
Ar3 675
Ar1 625
Mn 438

Impact strength of steel 12X2H4A

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -40
Blank with a section of 10 mm. Hardening 850 С, oil. Vacation 200 С, 1 hour HRCэ 40. 102 91
Blank with a section of 10 mm. Gas carburizing 910 C (along 4 sides), 3 hours. Hardening 810 C, oil. Vacation 200 C, 1 hour. Layer depth 0.65 mm. HRCe surface = 58. 34 25

Endurance limit of steel 12Х2Н4А

σ -1, MPa n σ B, MPa σ 0.2, MPa Heat treatment, steel condition
630 1E + 6 1220 1030 Guenching 860 C, oil. Tempering 780 C, oil. Vacation 180 C.
421   1180 980 Tempering 860 C, hardening 780 C, oil. Vacation 180 C.
519   1350 1140 Normalization 920 C, air. Guenching 810 С, oil. Vacation 200 C.
676   1180 930 Cementation 910 C, hardening 790 C, oil. Vacation 200 C.

Hardenability of steel 12X2H4A

Tempering 860 C.

Distance from the end, mm / HRC e
1.5 3 4.5 nine 12 fifteen eighteen 21 24 thirty
38.5−43.5 37.5−43.5 37.5−43.5 35.5−43.5 34−43.5 32−43.5 31−42.5 30.5−42 28.5−41.5 28−40.5
Amount of martensite,% Crit. Diam. in water, mm Crit. Diam. in oil, mm
95 30−100 18−80

Physical properties of steel 12X2H4A

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 7840 7820   7760 7710   7630      
Thermal conductivity coefficient W / (m ° С)   25     19          
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) 10.0 12.0 13.0 14.7 15.3 15.6        

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