Metals -> Tool steel -> High speed tool steel Characteristics of the material R9 ( R9, Р9 ).
Material : R9 ( R9, Р9 ) Substitute: Р18 Classification : High speed tool steel
Chemical composition in % of the material R9 ( 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 of the grade R9 ( R9, Р9 ).
Ac1 = 820 , Ac3 (Acm ) = 870 , Ar3 (Arcm ) = 780 , Ar1 = 740 , Mn = 180
Mechanical properties under Т=20o С of the material R9 ( R9, Р9 ) .
Assortment Dimension Direct. s в s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - 840 490 10 29 260 As-delivered state
Brinell hardness of the material R9 ( R9, Р9 ) (annealing) , HB 10 -1 = 255 MPa
Physical properties of the material R9 ( 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
Specification :
Mechanical properties : s в - Tensile strength , [MPa] s T - Yield stress, [MPa] d 5 - 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]
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