Steel 12ХН2А

Designation

Name The value
Designation GOST Cyrillic 12ХН2А
Designation GOST Latin 12XH2A
Transliteration 12HN2A
By chemical elements 12CrН2

Description

12ХН2А steel is used: for the manufacture of gears, shafts, worms, dog clutch, piston pins and other case hardening of parts, which are requirements of high strength, ductility and toughness of core and high surface hardness, working under shock loads and at low temperatures.

Standards

Name Code Standards
Sheets and strips В23 GOST 103-2006
Bars and shapes В32 GOST 1051-73, GOST 8559-75, GOST 8560-78, GOST 14955-77
Bars and shapes В22 GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006

Chemical composition

Standard C S P Mn Cr Si Ni Cu
0.09-0.16 ≤0.025 ≤0.025 0.3-0.6 0.6-0.9 0.17-0.37 1.5-1.9 ≤0.3
Chemical composition is not verified by NTD. Total verified brands for chemical compositions: 2972 ​​from 3363.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa HRC
Castings according to GOST 2685-75
15 590 780 12 50 88 - -
Quenching 880 °C, oil. Leave 600 °C, water.
100 390 530 33 77 - - -
100 370 510 30 76 - - -
Castings according to GOST 2685-75
- 392 539 14 - - - -
100 590 780 12 45 69 249 57-63
Quenching 880 °C, oil. Leave 600 °C, water.
30 420 550 29 79 363 - -
Castings according to GOST 2685-75
60 590 780 12 50 88 229 57
Quenching 880 °C, oil. Leave 600 °C, water.
50 400 550 31 78 363 - -
Quenching 880 °C, using water in oil. Leave 600 °C, water.
100 420 550 30 77 - - -
100 390 540 29 77 - - -
50 450 600 28 77 363 - -

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number
HRC Rockwell hardness (indenter diamond spheroconical)

Technological properties

Name The value
Weldability limited weldability. RDS, ADS submerged.
Склонность к отпускной хрупкости inclined
The temperature of forging Start - 1250 °C, the end - of 800 °C. the cross Sections up to 100 mm are cooled in air, 101-300 mm - mulde.
Flock-sensitive sensitivity not sensitive