20KHM Alloy structural steel

Steelun Designation of 20KHM Alloy structural steel:

Name The value
Designation GOST Cyrillic 20ХМ
Designation GOST Latin 20XM
Transliteration 20HM
By chemical elements 20CrMo

Description Steelun of 20KHM Alloy structural steel:

20KHM steel is used: for the manufacture of gear wheels gear boxes.

Note

Structural steel high-quality chrome-molybdenum.

Steelun Standards of 20KHM Alloy structural steel:

Name Code Standards
Name Code Standards
Bars and shapes В32 GOST 4543-71, GOST 14955-77, TU 14-1-2118-77, TU 14-11-245-88, TU 14-1-5228-93, 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
Processing of metals by pressure. Forgings В03 OST 5Р.9125-84, ST ЦКБА 010-2004

Chemical composition Steelun of 20KHM Alloy structural steel:

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 4543-71 0.15-0.25 ≤0.035 ≤0.035 0.4-0.7 0.8-1.1 0.17-0.37 ≤0.3 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%.

Steelun Mechanical properties of 20KHM Alloy structural steel:

Section, mm sT|s0,2, MPa σU, MPa d5, % y, %
Quenching in oil at 880 °C + vacation at 500 °C
≤15 600 800 12 50

Steelun Technological properties of 20KHM 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
y The relative narrowing

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