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 |
Chemical composition
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%.
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, % | 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. |
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 |