Steel 30G2

Designation

Name The value
Designation GOST Cyrillic 30Г2
Designation GOST Latin 30G2
Transliteration 30G2
By chemical elements 30Mn2

Description

Steel 30G2 used: for the manufacture of crankshafts, axle shafts, axles, clutch levers, fork gear shift, flange.

Note

Structural steel high-quality manganese.

Standards

Name Code Standards
Bars and shapes В32 GOST 4543-71, GOST 14955-77, GOST 1050-2013, TU 14-1-2118-77, TU 14-11-245-88, TU 14-1-1271-75, 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 14-1-5349-97, TU 14-1-4944-90

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 4543-71 0.26-0.35 ≤0.035 ≤0.035 1.4-1.8 ≤0.3 0.17-0.37 ≤0.3 Rest ≤0.3 ≤0.05 ≤0.03 ≤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%. In accordance with the order, the content of Mn = 1,2-1,6% can be established.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, %
Annealing in air at 880 °C + vacation at 600 °C, air cooling
≤25 345 590 15 45

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

Technological properties

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