| Grade : | 20KHGNR ( 20ХГНР ) |
| Substitute: | 20ХН3А, 12ХН2, 12ХН3А |
| Classification : | Alloy structurall steel |
| Equivalent grades: | Is absent |
Chemical composition in % for grade 20KHGNR ( 20ХГНР )
| C | Si | Mn | Ni | S | P | Cr | Ti | Cu | B |
| 0.16 - 0.23 | 0.17 - 0.37 | 0.7 - 1 | 0.8 - 1.1 | max 0.035 | max 0.035 | 0.7 - 1.1 | max 0.06 | max 0.3 | 0.001 - 0.005 |
Temperature of critical points for grade 20KHGNR ( 20ХГНР ).
| Ac1 = 740 , Ac3(Acm) = 830 , Ar3(Arcm) = 725 , Ar1 = 650 , Mn = 365 |
Mechanical properties under Т=20oС for grade 20KHGNR ( 20ХГНР )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Bar | Ø 25 | 1420 | 1370 | 14 | 60 | 1080 | Normalizing 930oC, air, Guenching 840oC, oil, Drawing 200oC, air, | |
| Bar | Ø 50 | 1200 | 1110 | 12 | 62 | 1470 | Normalizing 930oC, air, Guenching 840oC, oil, Drawing 200oC, air, | |
| Bar, GOST 4543-71 | Ø 15 | 1270 | 1080 | 10 | 50 | 880 | Guenching and drawing |
| Brinell hardness for 20KHGNR ( 20ХГНР ) (annealing) , GOST 4543-71 | HB 10 -1 = 197 MPa |
Technological properties for grade 20KHGNR ( 20ХГНР )
| Weldability: | limited weldability. |
| Flakes : | predisposed |
| Temper brittleness: | predisposed |
Types of delivery of grade 20KHGNR ( 20ХГНР )
| - |
| В22 - Graded and shaped rolling |
| B23 - Sheets and Strips |
| В32 - Graded and shaped rolling |
Specification :
| Mechanical properties : | |
| sв | - Tensile strength , [MPa] |
| sT | - Yield stress, [MPa] |
| d5 | - Specific elongation at fracture , [ % ] |
| y | - Reduction of area , [ % ] |
| KCU | - Impact strength , [ kJ / m2] |
| HB | - Brinell hardness , [MPa] |
Physical properties : | |
| T | - Test temperature , [Grade] |
| E | - Young modulus , [MPa] |
| a | - Coefficient of linear expansion (range 20o - T ) , [1/Grade] |
| l | - Termal (heat) condition coefficient , [Watt/(m·Grade)] |
| r | - Density , [kg/m3] |
| C | - Specific heat ( range 20o - T ), [J/(kg·Grade)] |
| R | - Electrical resistance , [Ohm·m] |
Weldability : | |
| without limitations | - welding is done without heating and subsequent heat treeting |
| limited weldability | - welding is possible under heating up to 100-120 grade and subsequent heat treeting |
| hard weldability | - obtaining the quality welding needs the additional operations:heating up to 200-300 grade; the heat treeting ia annealing |
20KHGNR ( 20ХГНР ) - Alloy structurall steel: chemical composition, mechanical and physical properties, hardness
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