Steel 50Г2

Designation

Name The value
Designation GOST Cyrillic 50Г2
Designation GOST Latin 50G2
Transliteration 50G2
By chemical elements 50Mn2

Description

50Г2 steel is used: for the manufacture of gears, friction disks, gear shafts and other parts working in abrasion.

Note

Structural steel high-quality manganese.

Standards

Name Code Standards
Sheets and strips В23 GOST 103-2006
Bars and shapes В32 GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 1050-2013, TU 14-1-2118-77, TU 14-11-245-88, TU 14-136-367-2008
Bars and shapes В22 GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Processing of metals by pressure. Forgings В03 GOST 8479-70, ST ЦКБА 010-2004
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 0.46-0.55 ≤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 t отпуска, °C sT|s0,2, MPa σU, MPa d5, % d10 y, % KCU, kJ/m2 HB, MPa
Quenching in oil from 840 °C to + vacation at 650 °C, air cooling
≤25 - 420 730 11 - 35 - -
Normalization
100-300 - 315 570 14 - 35 334 167-207
Quenching in oil from 820 °C to + leave + excerpt leave after 30 minutes, cooling in oil
- 400 1200 1320 - 5 37 - -
Normalization
≤80 - - 810 10 - 40 - 241
100 - 315 570 17 - 38 382 167-207
Quenching in oil from 820 °C to + leave + excerpt leave after 30 minutes, cooling in oil
- 500 980 1130 - 12 43 - -
Normalization at 810-830 °C, cooling in air + vacation at 400-500 °C, air cooling
300-500 - - 680 12 - 30 - 241
Normalization
100-300 - 345 590 17 - 40 530 174-217
Quenching in oil from 820 °C to + leave + excerpt leave after 30 minutes, cooling in oil
- 600 680 830 - 15 57 - -
Normalization
100 - 345 590 18 - 45 579 174-217
100 - 395 615 17 - 45 579 187-229

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
d10 Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number

Physical characteristics

Temperature l, W/(m · °C) a, 10-6 1/°C
100 41 113
200 40 122
300 38 122
400 36 -
500 35 123
600 - 147
800 - 147

A description of the physical symbols

Name Description
Е The normal elasticity modulus
G Modulus of elasticity shear torsion
r Density
l Coefficient of thermal conductivity
R UD. the resistivity

Technological properties

Name The value
Weldability does not apply to welded structures.
Склонность к отпускной хрупкости inclined
The temperature of forging Start - 1200 °C, the end - 750 °C-800. Of the workpiece cross-section up to 100 mm are cooled in air, 101-200 mm - mulde, 201-300 mm in a sealed mulde.
Flock-sensitive sensitivity insensitive