Steel 40KHGNM

Designation

Name The value
Designation GOST Cyrillic 40ХГНМ
Designation GOST Latin 40XGHM
Transliteration 40HGNM
By chemical elements 40CrMnНMo

Description

40KHGNM steel is used: for the manufacture of friction parts of the instrument; details of the subsidiary units of machines and devices; parts of the chassis of the car (steering knuckle, the bearing housing hub); tool and snap at the Volga automobile plant by type, used by «FIAT».

Note

Structural steel quality homomorphically molybdenum.

Standards

Name Code Standards
Bars and shapes В32 GOST 4543-71, GOST 14955-77, TU 14-1-5414-2001, TU 14-1-1859-76, TU 14-1-2118-77, 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, TU 14-1-993-74
Sheets and strips В33 TU 14-1-518-73

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
TU 14-1-518-73 0.37-0.43 ≤0.03 ≤0.03 0.5-0.8 0.6-0.9 0.17-0.37 0.7-1.1 Rest - - - 0.15-0.25 -
GOST 4543-71 0.37-0.43 ≤0.035 ≤0.035 0.5-0.8 0.6-0.9 0.17-0.37 0.7-1.1 Rest ≤0.3 ≤0.05 ≤0.03 0.15-0.25 ≤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%.
According to TU 14-1-993-74 the chemical composition is given for steel grade 40ХГНМ. Permissible deviations from the norms for chemical composition: carbon ± 0.010%, manganese, chromium, molybdenum and silicon ± 0.020% each, nickel ± 0.030%, sulfur and phosphorus ± 0.0050% each.
According to TU 14-1-518-73, the total content of sulfur and phosphorus in the steel should not be more than 0.060%. In the finished rolled products, if all the requirements of the technical specifications are met, deviations from the chemical composition standards are allowed in accordance with Table 3 of GOST 4543.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % KCU, kJ/m2 HB, MPa
High-quality and sheet hire. Quenching in oil from 840±10 °C + Vacation at 560-620 °C, air cooling
25 ≥835 ≥980 ≥11 ≥785 ≤241

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
KCU Toughness
HB Brinell hardness number

Technological properties

Name The value
Macrostructure and pollution The macrostructure of the steel when checking on the etched transverse templeto should not have shrinkage looseness, blistering, delamination, cracks, inclusions and placenow.
Microstructure Harvesting on the other 14-1-993-74 should be supplied with a grain size not larger than 5 rooms, allowed the presence of small quantities of grains the 3. Depth bezoperatsionnogo layer in the workpiece (ferrite + transition zone) must not exceed 1.5% per side.