Steel 25KH2N4MA

Designation

Name The value
Designation GOST Cyrillic 25Х2Н4МА
Designation GOST Latin 25X2H4MA
Transliteration 25H2N4MA
By chemical elements 25Cr2Н4Mo

Description

25KH2N4MA steel is used: for the production of large connecting rods, couplings and other parts, which are requirements of high viscosity and hardenability.

Note

Structural steel high-quality romancelatina.

Standards

Name Code Standards
Bars and shapes В32 GOST 4543-71, GOST 10702-78, GOST 14955-77, TU 14-1-2118-77, TU 14-1-950-74, TU 14-11-245-88, TU 14-136-367-2008
Bars and shapes В22 GOST 8319.0-75
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90
Classification, nomenclature and General rules В30 OST 3-98-80

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
TU 14-1-950-74 0.21-0.28 ≤0.025 ≤0.025 0.25-0.55 1.35-1.65 0.17-0.37 4-4.4 Rest ≤0.25 ≤0.05 ≤0.03 0.3-0.4 ≤0.2
GOST 4543-71 0.21-0.28 ≤0.025 ≤0.025 0.25-0.55 1.35-1.65 0.17-0.37 4-4.4 Rest ≤0.3 ≤0.05 ≤0.03 0.3-0.4 -
Fe is the basis.
GOST 4543-71 regulates the content of high-quality steel: P≤0,025%; S≤0.015%; Сu≤0.25%. When the alloying Mo is replaced with W, the designation of the steel grade will be 25Х2Н4ВА.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa
Hot-rolled steel and hot rolled with special surface finish
- - - - - - ≤255
Steel calibrated and calibrated with special surface finish
- - - - - - ≤269
Bars and strip hot rolled and forged. Quenching in oil with 835-865 °C + vacation at 520-600 °C, cooling in water or oil
25 932 1079 12 50 883 321-363

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
HB Brinell hardness number