Steel 25KHGT

Designation

Name The value
Designation GOST Cyrillic 25ХГТ
Designation GOST Latin 25XGT
Transliteration 25HGT
By chemical elements 25CrMnTi

Description

25KHGT steel is used: for the manufacture of loaded gear wheels and other parts, the hardness more HRCэ59.

Note

Structural steel quality chromatorgraphy.

Standards

Name Code Standards
Sheets and strips В23 GOST 103-2006
Bars and shapes В32 GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-5414-2001, TU 14-1-2118-77, TU 14-1-707-73, TU 14-11-245-88, TU 14-1-5228-93, TU 14-136-367-2008
Bars and shapes В22 GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 4543-71 0.22-0.29 ≤0.035 ≤0.035 0.8-1.1 1-1.3 0.17-0.37 ≤0.3 Rest ≤0.3 ≤0.05 0.03-0.09 ≤0.15 ≤0.2
Fe is the basis.
According to GOST 4543-71 the content in high-quality steel is regulated: P≤0,025%; S≤0.025%; Сu≤0.30%; in high-grade steel: P≤0,025%; S≤0.015%; Сu≤0.25%.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HRC
Rolled steel. Normalization at 880-950 °C, air cooling + Quenching in oil from 850 °C + Vacation at 200°C, cooling in oil, water or air
≥980 ≥1270 ≥10 ≥50 ≥690 -
Cementation at 920-950 °C, air cooling + Tempering in oil 840-860 °C + Vacation at 190-210 °C, air cooling
≥1100 ≥1500 ≥9 - ≥589 57-63

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
HRC Rockwell hardness (indenter diamond spheroconical)

Technological properties

Name The value
Weldability RDS, CCC; requires subsequent heat treatment.
Склонность к отпускной хрупкости Inclined.
The temperature of forging Beginning - 1220 °C, the end - of 800 °C.
Flock-sensitive sensitivity Sensitive.