Steel 45G

Designation

Name The value
Designation GOST Cyrillic 45Г
Designation GOST Latin 45G
Transliteration 45G
By chemical elements 45Mn

Description

Steel 45G used: for the manufacture of crankshafts, connecting rods, axles, propeller shafts, brake levers, friction disks, gear wheels, spline and gear shafts, anchor bolts.

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 10702-78, GOST 14955-77, GOST 1050-2013, TU 14-1-2118-77, TU 14-11-245-88, TU 14-1-1271-75, TU 14-136-367-2008
Bars and shapes В22 GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90
Steel pipes and fittings to them В62 TU 14-159-179-2003

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 4543-71 0.42-0.5 ≤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 d10 y, % KCU, kJ/m2 HB, MPa
Quenching in oil from 850°C + vacation at 600°C, air cooling
≤25 - 370 620 15 - - 40 480 -
Quenching in water 840 °C + vacation at 570 °C, air cooling
120 - 450 740 16 - - 50 59 -
Rod with cross section of 25 mm. Quenching in water from 790 °C to + leave [119]
- 375 1230 1310 - 9 - 42 137 418
Normalization 830 °C (coarse structure)
- - 370 760 - - 10 22 - -
Steel calibrated and calibrated with special surface finish, hot rolled and hot rolled with special surface finish
- - - - - - - - - ≤229
Quenching in water 840 °C + vacation at 570 °C, air cooling
200 - 430 740 16 - - 45 59 -
Rod with cross section of 25 mm. Quenching in water from 790 °C to + leave [119]
- 450 1120 1210 - 11 - 48 383 340
Normalization at 810 °C, air cooling
- - 460 730 21 - - 57 540 228
Normalization 830 °C (coarse structure)
- - 285 740 - - 20 35 - -
Annealing: heat to 780 °C at a speed of 340 deg/h, shutter speed, cooling with the furnace at a speed of 40 deg/h.
≤25 - 390 650 23 - - 50 422 179
Quenching in water 840 °C + vacation at 570 °C, air cooling
240 - 430 740 16 - - 45 59 -
Rod with cross section of 25 mm. Quenching in water from 790 °C to + leave [119]
- 525 900 1000 - 13 - 51 579 302
Normalization 830 °C (coarse structure)
- - 265 590 - - 20 47 - -
Quenching in water 840 °C + vacation at 570 °C, air cooling
30 - 550 800 18 - - 55 78 -
Rod with cross section of 25 mm. Quenching in oil from 810 °C to + leave [119]
- 375 - 1280 - 8 - 40 167 351
Normalization 830 °C (coarse structure)
- - 220 520 - - 37 52 - -
Quenching in water 840 °C + vacation at 570 °C, air cooling
50 - 490 760 18 - - 55 68 -
Rod with cross section of 25 mm. Quenching in oil from 810 °C to + leave [119]
- 525 810 950 - 14 - 52 667 269
Annealed (fine grained structure)
- - 570 810 - - 15 40 - -
Rod with cross section of 25 mm. Quenching in oil from 850 °C + vacation [140]
- 300 600 880 16 - - 50 383 -
Annealed (fine grained structure)
- - 460 780 - - 25 52 - -
Rod with cross section of 25 mm. Quenching in oil from 850 °C + vacation [140]
- 400 580 880 16 - - 50 480 -
Annealed (fine grained structure)
- - 375 640 - - 25 55 - -
Rod with cross section of 25 mm. Quenching in oil from 850 °C + vacation [140]
- 500 580 870 18 - - 51 480 -
Annealed (fine grained structure)
- - 255 450 - - 45 60 - -
Rod with cross section of 25 mm. Quenching in oil from 850 °C + vacation [140]
- 600 500 780 22 - - 57 667 -

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

Technological properties

Name The value
Weldability difficult weldability. The welding method of ADS. Recommended preheating and subsequent heat treatment.
Склонность к отпускной хрупкости malosana [119]
The temperature of forging Start - 1190 °C, the end - 820 °C.