Steel 23KH2NMFA

Designation

Name The value
Designation GOST Cyrillic 23Х2НМФА
Designation GOST Latin 23X2HMFA
Transliteration 23H2NMFA
By chemical elements 23Cr2НMoV

Description

23KH2NMFA steel is used: for the manufacture of critical shtampovannyh structures; for heavy welded assemblies and structures, not subjected to the annealing or normalizing after welding due to large dimensions or design features, as well as welded and nesvorny parts operating at temperatures up to 500 °C.

Note

Complex alloyed steel with low carbon content. Steel 23KH2NMFA strengthen by heat treatment (quenching in oil with subsequent tempering or normalizing with tempering).

Standards

Name Code Standards
Sheets and strips В33 GOST 11268-76, GOST 11269-76
Sheets and strips В23 GOST 82-70
Bars and shapes В32 TU 14-1-950-74

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
TU 14-1-950-74 0.19-0.26 ≤0.025 ≤0.025 0.3-0.6 1.9-2.4 0.17-0.37 0.8-1.2 Rest ≤0.25 0.18-0.28 ≤0.03 0.35-0.45 ≤0.2
GOST 11268-76 0.19-0.26 ≤0.025 ≤0.025 0.3-0.7 1.9-2.4 0.17-0.37 0.8-1.2 Rest ≤0.25 0.18-0.28 ≤0.03 0.35-0.45 ≤0.2
Fe is the basis.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % d10 y, % KCU, kJ/m2 HB, MPa
Steel hot-rolled sheet (4-60 mm) 4-th and 5-th categories. Quenching in oil with 890±15 °C, leave at 590-620 °C, air cooling or oil
- ≥1130 ≥9 - - ≥390 -
Flats on the other 14-1-4118-2004
≤3.9 - 490-785 ≥17 ≥15 - - -
Bars and strip hot rolled and forged. Quenching in oil with 875-905 °C + vacation at 590-620 °C, cooling in air or in oil
25 932 1128 12 - 50 540 341-415

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
d10 Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number