Designation
| Name |
The value |
| Designation GOST Cyrillic |
20ХНЛ |
| Designation GOST Latin |
20XHL |
| Transliteration |
20HNL |
| By chemical elements |
20CrН |
Description
20ХНЛ steel is used: for the manufacture of the 1st, 2nd and 3rd groups casting parts of pipe fittings high tensile strength, operating temperatures of the working medium up to +400 °C without limitations nominal operating pressure.
Standards
| Name |
Code |
Standards |
| Steel castings |
В82 |
OST 26-07-402-83, ST ЦКБА 014-2004 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
| ST ЦКБА 014-2004 |
0.2-0.3 |
≤0.04 |
≤0.04 |
0.35-0.9 |
0.4-2 |
0.2-0.6 |
0.4-1.5 |
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. Annealing at 850-900 °C, cooling with the furnace to 600 °C further cooling in air |
| ≥250 |
≥450 |
≥19 |
≥30 |
≥400 |
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 |
