Designation
| Name |
The value |
| Designation GOST Cyrillic |
20ХН3Л |
| Designation GOST Latin |
20XH3L |
| Transliteration |
20HN3L |
| By chemical elements |
20CrН3 |
Description
20ХН3Л steel is used: for the manufacture of the 1st, 2nd and 3rd groups casting parts of pipe fittings in North version with the testing of impact toughness KCU-50 -70≥250 kJ/m2 (2,5 kgf·m/cm2) operating at working environment temperature from -70 to +450 °C without limitations nominal operating pressure.
Standards
| Name |
Code |
Standards |
| Steel castings |
В82 |
OST 26-07-402-83, TU 26-02-19-75, TU 4112-091-00220302-2006, ST ЦКБА 014-2004 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
| ST ЦКБА 014-2004 |
0.15-0.25 |
≤0.035 |
≤0.04 |
0.3-0.6 |
0.6-0.9 |
0.2-0.5 |
2.75-3.75 |
Rest |
≤0.3 |
Fe is the basis.
Mechanical properties
| sT|s0,2, MPa |
σU, MPa |
d |
y, % |
KCU, kJ/m2 |
| Casting parts of pipe fittings. The first normalization at 900 °C, the second normalization at 830 °C, air cooling + vacation at 650 °C, air cooling KCU+20/-70 |
| ≥400 |
≥600 |
≥12 |
≥20 |
≥500/250 |
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 |
| d |
Elongation after rupture |
| y |
The relative narrowing |
| KCU |
Toughness |
