Steel 23KH2NVFA (ЭИ659)

Designation

Name The value
Designation GOST Cyrillic 23Х2НВФА
Designation GOST Latin 23X2HBFA
Transliteration 23H2NVFA
By chemical elements 23Cr2НWV
Name The value
Designation GOST Cyrillic ЭИ659
Designation GOST Latin EI659
Transliteration EhI659
By chemical elements -

Description

23KH2NVFA 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; solid-rolled rings for different purposes.

Note

Complex alloyed steel with low carbon content.

Standards

Name Code Standards
Sheets and strips В33 GOST 11268-76, GOST 11269-76, TU 14-1-1839-76
Sheets and strips В23 GOST 82-70
Bars and shapes В32 OST 1 92049-76, TU 14-1-950-74, TU 14-1-3238-81, TU 14-1-3238-2006
Blanks. Of the workpiece. Slabs В31 TU 1-92-156-90
Processing of metals by pressure. Forgings В03 TU 14-1-1530-75

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 ≤0.15 1-1.4
TU 14-1-3238-81 0.19-0.26 ≤0.025 ≤0.025 0.3-0.6 1.9-2.4 0.17-0.37 0.8-1.02 Rest - 0.18-0.28 - - 1-1.4
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 ≤0.15 1-1.4
Fe is the basis.
According to TU 14-1-3238-81 the chemical composition is given for steel grade 23H2NVFA. For steel grade 23Х2НВФА-СШ the content S≤0,015%.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % d10 y, % KCU, kJ/m2 HB, MPa
Ring forged in OST 1 92049-76. Quenching in oil with 875-905 °C + Vacation at 590-620 °C, air cooling or oil
25 ≥890 ≥1070 ≥9 - ≥40 ≥412 341-415
Steel hot-rolled sheet (4-60 mm) 4-th and 5-th categories. Quenching in oil with 890±15 °C + Vacation 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 - - ≤269
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
Bars and strip, hot-rolled, forged, kalibrovochnye with special surface finish. Quenching in oil 920-930 °C + Vacation at 450-550 °C, air cooling (TU 14-1-3238-81)
25 ≥931 ≥1127 ≥12 - ≥50 ≥540 -

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

Technological properties

Name The value
Weldability Steel is well welded using the resistance welding satisfactorily — manual welding, automatic submerged arc, argon-arc manual and automatic. After welding, parts and components must be subjected to the release at 500 °C. the release of parts of complex configuration must be carried out immediately after welding.
Features of heat treatment Steel 23KH2NVFA strengthen by heat treatment (quenching in oil with subsequent tempering or normalizing with tempering).