| Grade : | 50KH ( 50Х ) |
| Substitute: | 40Х, 45Х, 50ХН, 50ХФА |
| Classification : | Alloy structurall steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade 50KH ( 50Х )
| C | Si | Mn | Ni | S | P | Cr | Cu |
| 0.46 - 0.54 | 0.17 - 0.37 | 0.5 - 0.8 | max 0.3 | max 0.035 | max 0.035 | 0.8 - 1.1 | max 0.3 |
Temperature of critical points for grade 50KH ( 50Х ).
| Ac1 = 720 , Ac3(Acm) = 770 , Ar3(Arcm) = 693 , Ar1 = 660 , Mn = 250 |
Mechanical properties under Т=20oС for grade 50KH ( 50Х )
| 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 | 390 | Guenching 830oC, oil, Drawing 520oC, water, | |
| Forging | to 100 | 590 | 345 | 18 | 45 | 590 | Normalizing | |
| Forging | 100 - 300 | 590 | 345 | 17 | 40 | 540 | Normalizing | |
| Forging | 300 - 500 | 590 | 345 | 14 | 38 | 490 | Normalizing | |
| Forging | 500 - 800 | 590 | 345 | 12 | 38 | 390 | Normalizing |
| Brinell hardness for 50KH ( 50Х ) (annealing) , GOST 4543-71 | HB 10 -1 = 229 MPa |
Technological properties for grade 50KH ( 50Х )
| Weldability: | hard weldability. |
| Flakes : | predisposed |
| Temper brittleness: | predisposed |
Physical properties for grade 50KH ( 50Х )
| 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 | 2.07 | 7820 | ||||
| 100 | 12.8 | |||||
| 200 | 13 | |||||
| 300 | 13.8 | |||||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade 50KH ( 50Х )
| USA | Germany | France | Bulgaria | Poland | ||||||||||||||
| - | DIN,WNr | AFNOR | BDS | PN | ||||||||||||||
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Types of delivery of grade 50KH ( 50Х )
| B03 - Metal forming treatment. Forgings |
| 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 |
50KH ( 50Х ) - Alloy structurall steel: chemical composition, mechanical and physical properties, hardness
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