20KHGNR Alloy structural steel

Steelun Designation of 20KHGNR Alloy structural steel:

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

Description Steelun of 20KHGNR Alloy structural steel:

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.

Steelun Standards of 20KHGNR 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 20KHGNR Alloy structural steel:

Standard C S P Mn Cr Si Ni Fe Cu V B Ti
GOST 4543-71 0.16-0.23 ≤0.035 ≤0.035 0.7-1 0.7-1.1 0.17-0.37 0.8-1.1 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 20KHGNR Alloy structural steel:

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 steelun of 20KHGNR 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
HB Brinell hardness number
HRC Rockwell hardness (indenter diamond spheroconical)

Steelun Technological properties of 20KHGNR Alloy structural steel:

Name The value
Weldability RDS. Recommended heating and subsequent heat treatment.
The tendency to temper brittleness 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

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