20KHGNM Alloy structural steel

Steelun Designation of 20KHGNM Alloy structural steel:

Name The value
Designation GOST Cyrillic 20ХГНМ
Designation GOST Latin 20XGHM
Transliteration 20HGNM
By chemical elements 20CrMnНMo

Description Steelun of 20KHGNM Alloy structural steel:

20KHGNM steel is used: for the manufacture of critical parts in case hardening and an improved condition, and requirements of high strength, toughness and wear resistance; parts exposed to high vibration and dynamic loads; tools and accessories at the Volga automobile plant by type, used by «FIAT».

Note

Steel structural quality homomorphically molybdenum.
Steel can be used at temperatures from -70 to +450 °C.

Steelun Standards of 20KHGNM Alloy structural steel:

Name Code Standards
Bars and shapes В32 GOST 4543-71, GOST 14955-77, TU 14-1-5414-2001, TU 14-1-2118-77, TU 14-1-4151-86, TU 0951-092-00187895-97, TU 14-11-245-88, TU 14-1-5452-2002, TU 14-1-2252-2007, TU 14-1-1648-76, TU 14-136-367-2008
Bars and shapes В22 GOST 8319.0-75, TU 0951-092-00187895-01
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90
Sheets and strips В33 TU 14-1-518-73
Steel pipes and fittings to them В62 TU 14-159-244-94

Chemical composition Steelun of 20KHGNM Alloy structural steel:

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
TU 14-1-518-73 0.18-0.23 ≤0.035 ≤0.035 0.7-1.1 0.4-0.7 0.17-0.37 0.4-0.7 Rest 0.15-0.25
GOST 4543-71 0.18-0.23 ≤0.035 ≤0.035 0.7-1.1 0.4-0.7 0.17-0.37 0.4-0.7 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 14-1-518-73, 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.

Steelun Mechanical properties of 20KHGNM Alloy structural steel:

Section, mm sT|s0,2, MPa σU, MPa d5, % KCU, kJ/m2 HB, MPa
High-quality and sheet hire. Quenching in oil from 860±10 °C + Vacation at 150-180 °C, air cooling
25 ≥885 ≥1180 ≥7 ≥588 ≤235

Description mechanical marks steelun of 20KHGNM Alloy structural steel:

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

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