20KHGR Alloy structural steel

Steelun Designation of 20KHGR Alloy structural steel:

Name The value
Designation GOST Cyrillic 20ХГР
Designation GOST Latin 20XGP
Transliteration 20HGR
By chemical elements 20CrMnB

Description Steelun of 20KHGR Alloy structural steel:

20KHGR steel is used: for the manufacture of gears, shaft gears, worms, dog clutch, rollers, fingers, bushings, and other improve or case hardening of parts operating under conditions of shock loads.

Note

Structural steel quality chromatorgraphy.

Steelun Standards of 20KHGR Alloy structural steel:

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, 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
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90

Chemical composition Steelun of 20KHGR Alloy structural steel:

Standard C S P Mn Cr Si Ni Fe Cu V B Ti
GOST 4543-71 0.18-0.24 ≤0.035 ≤0.035 0.7-1 0.75-1.05 0.17-0.37 ≤0.3 Rest ≤0.3 ≤0.05 0.001-0.005 ≤0.06
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%.

Steelun Mechanical properties of 20KHGR Alloy structural steel:

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2
Quenching in oil at 880 °C + vacation at 200 °C, cooling in air or in oil
≤15 780 980 9 50 765
Quenching in oil at 880 °C to + vacation, cooling in oil
200 1220 1490 12 55 765
300 1230 1420 13 45 549
400 1160 1250 13 57 736
500 850 900 16 66 1432
600 720 790 19 73 1697

Description mechanical marks steelun of 20KHGR Alloy structural steel:

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

Steelun Physical characteristics of 20KHGR Alloy structural steel:

Temperature Е, HPa r, kg/m3 a, 10-6 1/°C
0 207 7800
20 207 7800
300 117
600 146

A description of the physical symbols steelun of 20KHGR Alloy structural steel:

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

Steelun Technological properties of 20KHGR Alloy structural steel:

Name The value
The tendency to temper brittleness malosana
The temperature of forging Start – 1150 °C, the end – of 800 °C. Sections greater than 75 mm are cooled slowly.
Flock-sensitive sensitivity not sensitive

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