Steel 30KH3MF

Designation

Name The value
Designation GOST Cyrillic 30Х3МФ
Designation GOST Latin 30X3MF
Transliteration 30H3MF
By chemical elements 30Cr3MoV

Description

30KH3MF steel is used: for the manufacture of parts for marine diesel engines and other parts that must have wear resistance at high pressures, the steel is subjected to nitriding.

Note

Structural steel high-quality chrome-molybdenum-vanadium. Steel heat resistant up to 450 °C.

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 14-136-367-2008
Bars and shapes В22 GOST 8319.0-75
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 4543-71 0.27-0.34 ≤0.035 ≤0.035 0.3-0.6 2.3-2.7 0.17-0.37 ≤0.3 Rest ≤0.3 0.06-0.12 ≤0.03 0.2-0.3 ≤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
Quenching in oil from 870 °C to + vacation at 620 °C, cooling in water
≤25 835 980 12 55 980

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

Technological properties

Name The value
Склонность к отпускной хрупкости inclined
Flock-sensitive sensitivity sensitive