| Grade : | R9 ( Р9 ) |
| Substitute: | Р18 |
| Classification : | High speed tool steel |
| Equivalent grades: | Go here |
Chemical composition in % for grade R9 ( Р9 )
| C | Si | Mn | Ni | S | P | Cr | Mo | W | V | Co |
| 0.85 - 0.95 | max 0.5 | max 0.5 | max 0.4 | max 0.03 | max 0.03 | 3.8 - 4.4 | max 1 | 8.5 - 9.5 | 2.3 - 2.7 | max 0.5 |
Temperature of critical points for grade R9 ( Р9 ).
| Ac1 = 820 , Ac3(Acm) = 870 , Ar3(Arcm) = 780 , Ar1 = 740 , Mn = 180 |
Mechanical properties under Т=20oС for grade R9 ( Р9 )
| Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
| - | mm | - | MPa | MPa | % | % | kJ / m2 | - |
| 840 | 490 | 10 | 29 | 260 | As-delivered state | |||
| Band annealed , GOST 2283-79 | 0.1 - 4 | 880 |
| Brinell hardness for R9 ( Р9 ) (annealing) , | HB 10 -1 = 255 MPa |
Physical properties for grade R9 ( Р9 )
| 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 | 2.2 | 8300 | 380 | |||
| 100 | 23 | 417 | ||||
| 200 | 25 | 505 | ||||
| 300 | 26 | 600 | ||||
| 400 | 28 | 695 | ||||
| 500 | 30 | 790 | ||||
| 600 | 31 | 900 | ||||
| 700 | 1020 | |||||
| 800 | 1160 | |||||
| 900 | 1170 | |||||
| T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
Equivalent steels for grade R9 ( Р9 )
| Czechia | |
| CSN | |
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Types of delivery of grade R9 ( Р9 )
| B34 - Ribbons |
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] |
R9 ( Р9 ) - High speed tool steel: chemical composition, mechanical and physical properties, hardness
Database of steels and alloys (Marochnik) contains information about chemical composition and properties more then 3000 steels and alloys
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