| Grade : | 50KHN ( 50ХН ) |
| Substitute: | 40ХН, 60ХГ |
| Classification : | Alloy structurall steel |
| Equivalent grades: | Is absent |
Chemical composition in % for grade 50KHN ( 50ХН )
| C | Si | Mn | Ni | S | P | Cr | Cu |
| 0.46 - 0.54 | 0.17 - 0.37 | 0.5 - 0.8 | 1 - 1.4 | max 0.035 | max 0.035 | 0.45 - 0.75 | max 0.3 |
Temperature of critical points for grade 50KHN ( 50ХН ).
| Ac1 = 735 , Ac3(Acm) = 755 , Ar3(Arcm) = 690 , Ar1 = 660 , Mn = 300 |
Mechanical properties under Т=20oС for grade 50KHN ( 50ХН )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Bar, GOST 4543-71 | Ø 25 | 1080 | 885 | 9 | 40 | 490 | Guenching 820oC, water, Drawing 530oC, water, |
| Brinell hardness for 50KHN ( 50ХН ) (annealing) , GOST 4543-71 | HB 10 -1 = 207 MPa |
| Brinell hardness for 50KHN ( 50ХН ) , Bar GOST 10702-78 | HB 10 -1 = 197 MPa |
Technological properties for grade 50KHN ( 50ХН )
| Weldability: | is not used. |
| Flakes : | predisposed |
| Temper brittleness: | predisposed |
Physical properties for grade 50KHN ( 50ХН )
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
| Grade | MPa | 1/Grade | Watt/(m·Grade) | kg/m3 | J/(kg·Grade) | Ohm·m |
| 20 | 7860 | |||||
| 100 | 11.8 | 43 | 500 | |||
| 200 | 40 | 510 | ||||
| 300 | 12.3 | 39 | 560 | |||
| 400 | 13.4 | 38 | 630 | |||
| 500 | 14 | 37 | 700 | |||
| 600 | 36 | 800 | ||||
| 700 | 32 | 910 | ||||
| 800 | 23 | 650 | ||||
| 900 | 24 | 610 | ||||
| 1000 | 700 | |||||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Types of delivery of grade 50KHN ( 50ХН )
| В22 - Graded and shaped rolling |
| B23 - Sheets and Strips |
| В32 - Graded and shaped rolling |
| В71 - Low-carbon steel wire |
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 |
50KHN ( 50ХН ) - Alloy structurall steel: chemical composition, mechanical and physical properties, hardness
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