Steel 25НЛ

Designation

Name The value
Designation GOST Cyrillic 25НЛ
Designation GOST Latin 25HL
Transliteration 25NL
By chemical elements 25Н

Description

25НЛ steel is used: for the manufacture of casting parts for gas turbines and axial compressors operating at temperatures from -70 to +350 °C.

Note

Steel pearlitic class.

Standards

Name Code Standards
Steel castings В82 OST 108.961.04-80

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu
OST 108.961.04-80 0.22-0.3 ≤0.025 ≤0.025 0.5-0.8 ≤0.3 0.17-0.37 0.7-1.2 Rest ≤0.3
Fe is the basis.
According to OST 108.961.04-80, the total sulfur and phosphorus content should be ≤ 0.050% for all possible tolerances.

Mechanical properties

sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2
Casting parts of gas turbines. Annealing at 850-870 °C, cooling with furnace + quenching in oil with 860-880 °C + vacation at 640-670 °C, cooling with the furnace to 300 °C
≥245 ≥441 ≥19 ≥30 ≥390

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