| Grade : | 90KHF ( 90ХФ ) |
| Substitute: | 9Х1, 9Х2 |
| Classification : | Tool steel for roller |
| Equivalent grades: | Is absent |
Chemical composition in % for grade 90KHF ( 90ХФ )
| C | Si | Mn | Ni | S | P | Cr | V | Cu |
| 0.8 - 0.9 | 0.15 - 0.35 | 0.3 - 0.6 | max 0.35 | max 0.03 | max 0.03 | 0.4 - 0.7 | 0.15 - 0.3 | max 0.3 |
Temperature of critical points for grade 90KHF ( 90ХФ ).
| Ac1 = 700 , Mn = 215 |
Mechanical properties under Т=20oС for grade 90KHF ( 90ХФ )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| Steel | 990 | 670 | 19 | 55 | 450 | Normalizing 870oC,Drawing 650oC, |
| Brinell hardness for 90KHF ( 90ХФ ) (annealing) , GOST 5950 | HB 10 -1 = 241 MPa |
Technological properties for grade 90KHF ( 90ХФ )
| Weldability: | is not used. |
| Flakes : | predisposed |
| Temper brittleness: | predisposed |
Physical properties for grade 90KHF ( 90ХФ )
| 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 | ||||||
| 100 | 44 | 460 | ||||
| 200 | 42 | 500 | ||||
| 300 | 38 | 560 | ||||
| 400 | 36 | 620 | ||||
| 500 | 33 | 670 | ||||
| 600 | 31 | 730 | ||||
| 700 | 29 | 1320 | ||||
| 800 | 27 | 720 | ||||
| 900 | 27 | 640 | ||||
| 1000 | 650 | |||||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
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 |
90KHF ( 90ХФ ) - Tool steel for roller: chemical composition, mechanical and physical properties, hardness
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