Steel 45G2

Designation

Name The value
Designation GOST Cyrillic 45Г2
Designation GOST Latin 45G2
Transliteration 45G2
By chemical elements 45Mn2

Description

45G2 steel is used: for the manufacture of shaft-gear, crankshaft and propeller shafts, axle shafts, worms, covers, connecting rods, connecting rods, links, conveyor chains and other large sredneshirotnykh details.

Note

Structural steel high-quality manganese.

Standards

Name Code Standards
Bars and shapes В32 GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-1659-76, TU 14-1-2118-77, TU 14-11-245-88, TU 14-136-367-2008
Bars and shapes В22 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

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 4543-71 0.41-0.49 ≤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, % y, % HB, MPa
Quenching in oil from 850°C + vacation at 650°C, air cooling
≤25 - 400 680 11 40 -
Rod with cross section of 25 mm. Quenching in oil from 810 °C to + leave + hladanie in oil [119]
- 375 - 1390 7 42 418
A sample with a diameter of 10 mm and a length of 50 mm, laminated and annealed
- - 97 115 35 98 -
Rod with cross section of 25 mm. Quenching in oil from 810 °C to + leave + hladanie in oil [119]
- 450 - 1200 8 42 340
Normalization at 810 °C, air cooling
- - 480 800 18 51 241
A sample with a diameter of 10 mm and a length of 50 mm, laminated and annealed
- - 55 74 54 98 -
Annealing: heat to 780 °C with a speed of 350 deg/h, shutter speed, cooling with the furnace at a speed of 40 deg/h
≤25 - 350 670 21 44 187
Rod with cross section of 25 mm. Quenching in oil from 810 °C to + leave + hladanie in oil [119]
- 525 - 1040 13 47 302
A sample with a diameter of 10 mm and a length of 50 mm, laminated and annealed
- - 35 49 59 100 -
Rod with cross section of 25 mm. Quenching in oil from 810 °C to + leave + hladanie in oil [119]
- 600 810 920 15 54 269
A sample with a diameter of 10 mm and a length of 50 mm, laminated and annealed
- - 27 35 63 100 -
A rod with a diameter of 35 mm. Quenching in oil from 850 °C + vacation [140]
- 300 1290 1520 5 10 -
A sample with a diameter of 10 mm and a length of 50 mm, laminated and annealed
- - 17 26 73 100 -
A rod with a diameter of 35 mm. Quenching in oil from 850 °C + vacation [140]
- 400 1080 1270 6 16 -
- 500 730 1030 11 39 -
- 600 670 860 18 52 -
A rod with a section of 70 mm. Quenching in water from 820 °C to + leave [140]
- 300 1180 1500 6 16 -
- 400 900 1180 9 34 -
- 500 740 970 13 49 -
- 600 640 810 11 60 -
A rod with a section of 70 mm. Quenching in oil from 850 °C + vacation [140]
- 300 610 1010 17 47 -
- 400 640 980 17 47 -
- 500 630 920 18 50 -
- 600 540 820 20 55 -

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
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)
0 204 83 7810 - - -
20 204 - 7810 - - -
200 - - - 45 119 445
300 - - - 43 119 445
400 - - - 41 - -
500 - - - 35 127 428
100 - - - - 113 -
700 - - - - 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 RDS - necessary heating and subsequent heat treatment. KTS - requires subsequent heat treatment.
Склонность к отпускной хрупкости inclined
The temperature of forging Start - 1200 °C, the end - of 750-800 °C. the cross Sections up to 100 mm are cooled in air, section 101-300 mm - mulde.
Flock-sensitive sensitivity insensitive
Machinability After normalization with HB 229 Kn TV.SPL.=0.80 Kn b.St.=0.55