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 |
