Designation
| Name |
The value |
| Designation GOST Cyrillic |
20ХН |
| Designation GOST Latin |
20XH |
| Transliteration |
20HN |
| By chemical elements |
20CrН |
Description
20KHN steel is used: for the manufacture of gears, bushings, fingers, fasteners and other parts, which require high viscosity and moderate hardenability.
Note
Structural steel high-quality stainless.
Standards
| Name |
Code |
Standards |
| Sheets and strips |
В23 |
GOST 103-2006 |
| Bars and shapes |
В32 |
GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-2118-77, TU 14-11-245-88, TU 14-1-5228-93, TU 14-136-367-2008 |
| Bars and shapes |
В22 |
GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006 |
| Blanks. Of the workpiece. Slabs |
В31 |
OST 3-1686-90, TU 14-1-4944-90 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| GOST 4543-71 |
0.17-0.23 |
≤0.035 |
≤0.035 |
0.4-0.7 |
0.45-0.75 |
0.17-0.37 |
1-1.4 |
Rest |
≤0.3 |
≤0.05 |
≤0.03 |
≤0.15 |
≤0.2 |
Fe is the basis.
According to GOST 4543-71 the content in high-quality steel is regulated: P≤0,025%; S≤0.025%; Сu≤0.30%; in high-grade steel: P≤0,025%; S≤0.015%; Сu≤0.25%.
Mechanical properties
| Section, mm |
t отпуска, °C |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
KCU, kJ/m2 |
HRC |
| Quenching in water or oil from 860 °C + quenching in water or oil with 760-810 °C + vacation at 180 °C, cooling in water or oil |
| ≤15 |
- |
590 |
780 |
14 |
50 |
765 |
- |
| Quenching in oil from 860 °C to + vacation at 180 °C |
| 100 |
- |
510 |
860 |
10 |
- |
90 |
- |
| Sample a cross section of 10 mm. Quenching in oil from 850 °C + vacation |
| - |
200 |
1050 |
1290 |
11 |
48 |
90 |
62 |
| Quenching in oil from 860 °C to + vacation at 180 °C |
| 20 |
- |
750 |
1130 |
10 |
- |
85 |
- |
| Sample a cross section of 10 mm. Quenching in oil from 850 °C + vacation |
| - |
300 |
1000 |
1220 |
- |
50 |
80 |
60 |
| Quenching in oil from 860 °C to + vacation at 180 °C |
| 40 |
- |
600 |
990 |
10 |
- |
90 |
- |
| Sample a cross section of 10 mm. Quenching in oil from 850 °C + vacation |
| - |
400 |
910 |
1100 |
11 |
51 |
75 |
- |
| Quenching in oil from 860 °C to + vacation at 180 °C |
| 80 |
- |
520 |
870 |
10 |
- |
90 |
- |
| Sample a cross section of 10 mm. Quenching in oil from 850 °C + vacation |
| - |
500 |
770 |
950 |
14 |
54 |
110 |
- |
| - |
600 |
650 |
770 |
20 |
60 |
180 |
- |
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 |
| HRC |
Rockwell hardness (indenter diamond spheroconical) |
Technological properties
| Name |
The value |
| Weldability |
limited weldability. [2]. |
| Склонность к отпускной хрупкости |
tend [81] |
| The temperature of forging |
Start - 1250 °C, end - 830 °C. [108]. Sections up to 50 mm are cooled in air, 50-100 mm in mulde, 101-200 mm in a closed trough. |
| Flock-sensitive sensitivity |
sensitive [81] |
