Steel 25KH2NML

Designation

Name The value
Designation GOST Cyrillic 25Х2НМЛ
Designation GOST Latin 25X2HML
Transliteration 25H2NML
By chemical elements 25Cr2НMo

Description

25KH2NML steel is used: for the manufacture of casting parts heavy and transport engineering, working in conditions of low temperatures and elevated loading conditions; responsible welded-cast structures of large sections of career and draglines.

Note

Cold-resistant steel.

Standards

Name Code Standards
Castings with special properties (iron and steel) В83 GOST 21357-87

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu Mo
GOST 21357-87 0.22-0.3 ≤0.02 ≤0.02 0.5-0.8 1.6-1.9 0.2-0.4 0.6-0.9 Rest ≤0.3 0.2-0.3
Fe is the basis.

Mechanical properties

sT|s0,2, MPa σU, MPa d y, % KCU, kJ/m2
Annealing in air is 920 ° + vacation at 580-620 °C, air cooling
≥650 ≥750 ≥12 ≥25 ≥600
Casting section 140-250 mm. Annealing in air at 880 °C to + vacation at 560-570 °C, air cooling (named place of clippings sample)
≥970 ≥1170 ≥9 ≥38 ≥700
Casting. Quenching in water from 860-880 °C + vacation at 580-600 °C, air cooling (KCU-60)
≥700 ≥800 ≥12 ≥25 ≥3
Casting section 140-250 mm. Annealing in air at 880 °C to + vacation at 560-570 °C, air cooling (named place of clippings sample)
≥815 ≥915 ≥7 ≥21 ≥650

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