Steel 40G

Designation

Name The value
Designation GOST Cyrillic 40Г
Designation GOST Latin 40G
Transliteration 40G
By chemical elements 40Mn

Description

Steel 40G used: for the manufacture of axles, crankshafts, gears, rods, tires, parts, valves, connecting rods, sprockets and distribution of cylinders, heads, pistons and other parts, which are requirements of high strength.

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 2590-2006, GOST 2591-2006, GOST 2879-2006
Sheets and strips В33 GOST 1577-93
Bars and shapes В32 GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 10702-78, 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
Sheets and strips В23 GOST 82-70, GOST 19903-74, GOST 103-2006, 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 0.37-0.45 ≤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, % y, % KCU, kJ/m2 HB, MPa HRC
Quenching in water with 830-850 °C + vacation at 180-200 °C, air cooling
≤25 - - - - - - - 43-49
Quenching in water 840 °C + vacation at 550 °C, air cooling (named place of clippings sample)
100 - 540 810 19 53 - - -
A rod with a diameter of 35 mm. Quenching in water from 800 °C [24]
- 300 860 1120 10 30 - - -
Steel calibrated and calibrated with special surface finish, hot rolled and hot rolled with special surface finish
- - - - - - - ≤207 -
Quenching in water from 860° C to + vacation at 600 °C, air cooling
≤25 - 350 590 17 45 590 - -
Quenching in water 840 °C + vacation at 550 °C, air cooling (named place of clippings sample)
200 - 530 790 15 52 - - -
A rod with a diameter of 35 mm. Quenching in water from 800 °C [24]
- 400 780 1010 10 43 - - -
Quenching in water 840 °C + vacation at 550 °C, air cooling (named place of clippings sample)
50 - 590 820 20 51 - - -
A rod with a diameter of 35 mm. Quenching in water from 800 °C [24]
- 500 680 880 15 54 - - -
Quenching in water 840 °C + vacation at 550 °C, air cooling (named place of clippings sample)
100 - 490 790 22 50 - - -
A rod with a diameter of 35 mm. Quenching in water from 800 °C [24]
- 600 530 740 20 63 - - -
Quenching in water 840 °C + vacation at 550 °C, air cooling (named place of clippings sample)
200 - 480 760 24 50 - - -
A rod with a diameter of 35 mm. Quenching in water from 800 °C [24]
- 700 430 630 35 70 - - -
Quenching in water 840 °C + vacation at 550 °C, air cooling (named place of clippings sample)
50 - 570 820 20 49 - - -
A rod with a diameter of 35 mm. Quenching in oil from 850 °C [140]
- 300 570 760 14 50 - - -
- 400 550 760 16 51 - - -
- 500 510 720 18 51 - - -
- 600 440 680 22 55 - - -
- 700 320 580 30 66 - - -
A rod with a section of 70 mm. Quenching in water from 800 °C
- 300 580 880 14 46 - - -
- 400 570 850 15 47 - - -
- 500 540 790 19 55 - - -
- 600 500 730 23 60 - - -
- 700 430 620 27 70 - - -
A rod with a section of 70 mm. Quenching in oil from 850 °C
- 300 570 840 15 48 - - -
- 400 550 800 17 49 - - -
- 500 510 780 18 50 - - -
- 600 440 680 24 55 - - -
- 700 390 590 30 66 - - -

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
HB Brinell hardness number
HRC Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature Е, HPa r, kg/m3 l, W/(m · °C) a, 10-6 1/°C С, J/(kg · °C)
0 200 7810 - - -
20 200 7810 - - -
100 - - 60 111 487
200 - - 53 117 487
400 - - 47 - 483
500 - - 24 127 -
300 - - - 117 -
700 - - - 143 -
600 - - - - 491
800 - - - - 575

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 limited weldability. Welding methods: SMAW, submerged arc ADS. Recommended heating and subsequent heat treatment. The CCC without restriction.
Склонность к отпускной хрупкости inclined
The temperature of forging Start - 1250 °C, end - 800 °C. of the Workpiece cross-section up to 400 mm are cooled in air.
Flock-sensitive sensitivity insensitive
Machinability In a normalized state in HB 174-207 Kn TV.SPL.=0.95 Kn b.St.=0.70