Steel 21KH2NMFA

Designation

Name The value
Designation GOST Cyrillic 21Х2НМФА
Designation GOST Latin 21X2HMFA
Transliteration 21H2NMFA
By chemical elements 21Cr2НMoV

Description

21KH2NMFA 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.

Note

Complex alloyed high-quality steel with low carbon content. Steel 21KH2NVFA 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

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 11268-76 0.19-0.23 ≤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 σU, MPa d5, % d10 KCU, kJ/m2
Steel hot-rolled sheet (4-60 mm) 4-th and 5-th categories. Quenching in oil with 925±15 °C, leave at 550-570 °C, air cooling
≥1130 ≥9 - ≥390
A sheet of thin (≤3.9 mm) hot - and cold-rolled. Quenching in oil with 925 °C + vacation at 500-570 °C, air cooling
≥1128 ≥9 - -
Flats on the other 14-1-4118-2004
≤3.9 490-736 ≥15 ≥11 -

Description mechanical marks

Name Description
σU Limit short-term strength
d5 Elongation after rupture
d10 Elongation after rupture
KCU Toughness