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Grade : | R18 ( Р18 ) |
Substitute: | Р12 |
Classification : | High speed tool steel |
Equivalent grades: | Go here |
C | Si | Mn | Ni | S | P | Cr | Mo | W | V | Co | Cu |
0.73 - 0.83 | 0.2 - 0.5 | 0.2 - 0.5 | max 0.6 | max 0.03 | max 0.03 | 3.8 - 4.4 | max 1 | 17 - 18.5 | 1 - 1.4 | max 0.5 | max 0.25 |
Ac1 = 820 , Ac3(Acm) = 860 , Ar3(Arcm) = 770 , Ar1 = 725 |
Assortment | Dimension | Direct. | sв | sT | d5 | y | KCU | Heat treatment |
- | mm | - | MPa | MPa | % | % | kJ / m2 | - |
840 | 510 | 8 | 10 | 190 | As-delivered state |
Brinell hardness for R18 ( Р18 ) (annealing) , GOST 19265-73 | HB 10 -1 = 255 MPa |
Weldability: | without limitations. |
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 | 2.28 | 8800 | 419 | |||
100 | 2.23 | 26 | 472 | |||
200 | 2.19 | 27 | 544 | |||
300 | 2.1 | 28 | 627 | |||
400 | 2.01 | 29 | 718 | |||
500 | 1.92 | 28 | 815 | |||
600 | 1.81 | 27 | 922 | |||
700 | 27 | 1037 | ||||
800 | 1152 | |||||
900 | 1173 | |||||
T | E 10- 5 | a 10 6 | l | r | C | R 10 9 |
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В22 - Graded and shaped rolling |
В32 - Graded and shaped rolling |
B33 - Sheets and Strips |
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 |
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