Steel 50G

Designation

Name The value
Designation GOST Cyrillic 50Г
Designation GOST Latin 50G
Transliteration 50G
By chemical elements 50Mn

Description

Steel 50G used: for the manufacture of friction discs, shafts, gears, spline shafts, connecting rods, camshaft rollers, bushings bearings, cranks, spindles, rims, flywheels, crankshafts of diesel engines and gas engines and other details and requirements for high strength and wear resistance; hot-rolled flat towpath profile for agricultural machines; springs and measuring tapes.

Note

Structural steel high-quality manganese.

Standards

Name Code Standards
Bars and shapes В22 GOST 1133-71, GOST 8278-83, GOST 8281-80, GOST 8282-83, GOST 8283-93, GOST 8319.0-75, GOST 9234-74, GOST 11474-76, GOST 12492.6-90, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Sheets and strips В33 GOST 1577-93
Tape В34 GOST 2283-79, GOST 10234-77, TU 3-1509-88
Bars and shapes В32 GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 1050-2013, TU 14-1-1601-75, TU 14-1-2118-77, TU 14-1-2490-78, TU 14-11-245-88, TU 14-1-1271-75, TU 14-1-5228-93, TU 14-136-367-2008
Sheets and strips В23 GOST 82-70, GOST 19903-74, GOST 19903-90
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 0.48-0.56 ≤0.035 ≤0.035 0.7-1 ≤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%.

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % d4 d d10 y, % KCU, kJ/m2 HB, MPa
Tape flatted average strength of 0.1-4.0 mm according to GOST 10234-77 in the state of delivery (indicated delivery)
- - - 780-1270 - - - - - - -
- - - 780-930 - - - - - - -
- - - 930-1080 - - - - - - -
- - - 1080-1230 - - - - - - -
- - - ≤780 - - ≥10 - - - -
- - - ≤570 - - - - - - -
Quenching in water 840 °C + vacation at 560-580 °C, air cooling (named place of clippings sample)
120 - 470 760 - - - - - - -
Quenching in water 840 °C
- 540 740 880 17 - - - 50 - 260
Normalization at 830 °C, air cooling (coarse structure)
- - 370 760 - - - 10 22 - -
Quenching in water 840 °C + vacation at 560-580 °C, air cooling (named place of clippings sample)
160 - 470 760 - - - - - - -
Quenching in water 840 °C
- 580 680 810 18 - - - 52 - 235
Normalization at 830 °C, air cooling (coarse structure)
- - 285 740 - - - 20 35 - -
Quenching in water 840 °C + vacation at 560-580 °C, air cooling (named place of clippings sample)
240 - 450 760 - - - - - - -
Quenching in water 840 °C
- 620 600 750 22 - - - 56 - 220
Normalization at 830 °C, air cooling (coarse structure)
- - 260 590 - - - 20 47 - -
Quenching in water 840 °C + vacation at 560-580 °C, air cooling (named place of clippings sample)
120 - 510 800 - - - - - - -
Normalization at 830 °C, air cooling (coarse structure)
- - 220 520 - - - 37 52 - -
Quenching in water 840 °C + vacation at 560-580 °C, air cooling (named place of clippings sample)
160 - 510 800 - - - - - - -
Annealed (fine grained structure)
- - 570 810 - - - 15 40 - -
Quenching in water 840 °C + vacation at 560-580 °C, air cooling (named place of clippings sample)
240 - 490 780 - - - - - - -
Annealed (fine grained structure)
- - 460 780 - - - 25 52 - -
Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery
0.1-4 - - 740-1180 - - - - - - -
Quenching in water 840 °C + vacation at 560-580 °C, air cooling (named place of clippings sample)
120 - 450 740 16 - - - 50 - -
Annealed (fine grained structure)
- - 375 640 - - - 25 55 - -
Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery
0.1-1.5 - - ≤640 - ≥15 - - - - -
Quenching in water 840 °C + vacation at 560-580 °C, air cooling (named place of clippings sample)
160 - 430 740 16 - - - 45 - -
Annealed (fine grained structure)
- - 255 450 - - - 45 60 - -
Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery
1.5-4 - - ≤740 - ≥10 - - - - -
Quenching in water 840 °C + vacation at 560-580 °C, air cooling (named place of clippings sample)
240 - 430 740 16 - - - 45 - -
Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery
0.1-1.5 - - ≤610 - ≥15 - - - - -
Quenching in water 840 °C + vacation at 560-580 °C, air cooling (named place of clippings sample)
30 - 550 800 18 - - - 55 - -
Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery
1.5-4 - - ≤610 - ≥13 - - - - -
Quenching in water 840 °C + vacation at 560-580 °C, air cooling (named place of clippings sample)
50 - 490 760 18 - - - 55 - -
Rod. Quenching in water 840 °C + Vacation at 560-580 °C, air cooling
25-30 - 550 800 18 - - - 55 780 -
Quenching in water 840 °C + vacation at 560-580 °C, air cooling (named place of clippings sample)
80 - 470 740 18 - - - 50 - -
Rod. Quenching in water 840 °C + Vacation at 560-580 °C, air cooling
30-50 - 490 760 18 - - - 55 680 -
50-80 - 470 740 18 - - - 50 590 -
Rod. Quenching in oil from 850 °C + Vacation at 600 °C, air cooling
25 - 390 650 13 - - - - - -

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
d4 Elongation after rupture
d Elongation after rupture
d10 Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number

Physical characteristics

Temperature Е, HPa G, HPa r, kg/m3 l, W/(m · °C) a, 10-6 1/°C С, J/(kg · °C)
20 216 - 7810 43 - -
300 199 77 - 38 132 517
400 185 73 - 36 138 533
800 130 50 - 28 151 609
1000 - - - - 123 676

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
a The coefficient of linear expansion
С Specific heat

Technological properties

Name The value
Weldability Difficult weldability. Welding methods: RDS - necessary heating and subsequent heat treatment. The CCC without restriction.
Склонность к отпускной хрупкости Inclined at 1.0 % Mn.
The temperature of forging Start - 1250 °C, the end - 780 °C. of the Workpiece cross-section up to 400 mm are cooled in air.
Flock-sensitive sensitivity Sensitive.
Machinability In the hot rolled condition when blower SB 202 and HB=710 MPa Kn TV.SPL.=0,90.