Steel 20KHGNR

Designation

Name The value
Designation GOST Cyrillic 20ХГНР
Designation GOST Latin 20XGHP
Transliteration 20HGNR
By chemical elements 20CrMnНB

Description

20KHGNR steel is used: for the manufacture of gear wheels, shaft-gear, worm, Cam couplings, bushings and other critical parts operating under conditions of shock loads.

Note

Structural steel quality homomorphically with titanium and boron.

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 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

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa HRC
Normalization of 930°C, air Annealing of 840°C, oil, Vacation, 200°C, air.
15-25 - 1370 1420 14 60 1060 - -
Bars. Normalizing at 930 °C, air cooling + tempering in oil from 840 °C to + vacation at 200 °C, air cooling
100-150 - 830 1000 16 50 961 286 -
When carburizing 930-950 °C + quenching in oil 830-850 °C + vacation at 170-230 °C, air cooling
≤15 - 1360 1460 13 60 1158 - 57-63
Quenching in oil from 860 °C to + leave + cooling in oil
- 200 1250 1510 11 55 598 - 47
A sample with diameter 10 mm, length 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/s.
- - 115 12 41 84 - - -
Normalization of 930°C, air Annealing of 840°C, oil, Vacation, 200°C, air.
25-50 - 1110 1200 12 62 1442 - -
Bars. Normalizing at 930 °C, air cooling + tempering in oil from 840 °C to + vacation at 200 °C, air cooling
15-25 - 1370 1420 14 60 1060 418 -
When carburizing 930-950 °C + quenching in oil 830-850 °C + vacation at 170-230 °C, air cooling
100-150 - 880 1040 17 50 1060 286 57-63
Quenching in oil from 860 °C to + leave + cooling in oil
- 300 1230 1400 8 50 608 - 47
A sample with diameter 10 mm, length 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/s.
- - 73 81 47 100 - - -
Normalizing at 930-950 °C, air cooling + tempering in oil with 780-830 °C + vacation at 200 °C, cooling in air or in oil
≤15 - 1080 1270 10 50 863 - -
Bars. Normalizing at 930 °C, air cooling + tempering in oil from 840 °C to + vacation at 200 °C, air cooling
25-50 - 1110 1200 12 62 1442 340 -
When carburizing 930-950 °C + quenching in oil 830-850 °C + vacation at 170-230 °C, air cooling
15-25 - 1310 1410 14 64 1246 - 57-63
Quenching in oil from 860 °C to + leave + cooling in oil
- 400 1180 1240 11 58 677 - 43
A sample with diameter 10 mm, length 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/s.
- - 32 44 58 100 - - -
Bars. Normalizing at 930 °C, air cooling + tempering in oil from 840 °C to + vacation at 200 °C, air cooling
50-75 - 970 1060 15 60 1060 302 -
When carburizing 930-950 °C + quenching in oil 830-850 °C + vacation at 170-230 °C, air cooling
25-50 - 1160 1260 13 64 1246 340 57-63
Quenching in oil from 860 °C to + leave + cooling in oil
- 500 970 970 14 64 1226 - 33
A sample with diameter 10 mm, length 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/s.
- - 19 29 63 100 - - -
Bars. Normalizing at 930 °C, air cooling + tempering in oil from 840 °C to + vacation at 200 °C, air cooling
75-100 - 920 1000 15 60 1246 302 -
When carburizing 930-950 °C + quenching in oil 830-850 °C + vacation at 170-230 °C, air cooling
50-75 - 1080 1140 12 60 1246 321 57-63
Quenching in oil from 860 °C to + leave + cooling in oil
- 600 690 820 17 65 1785 - 27
A sample with diameter 10 mm, length 50 mm, laminated. The rate of deformation of 20 mm/min strain Rate 0,007 1/s.
- - 15 25 76 100 - - -
When carburizing 930-950 °C + quenching in oil 830-850 °C + vacation at 170-230 °C, air cooling
75-100 - 930 1040 17 66 1246 302 57-63

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)

Technological properties

Name The value
Weldability RDS. Recommended heating and subsequent heat treatment.
Склонность к отпускной хрупкости inclined
The temperature of forging Start - 1150 °C, the end - of 800 °C. Sections longer than 60 mm are cooled slowly.
Flock-sensitive sensitivity sensitive