Metals -> Tool steel -> High speed tool steel Characteristics of the material R9M4K8 ( R9M4K8, Ð9Ì4Ê8 ).
Material : R9M4K8 ( R9M4K8, Ð9Ì4Ê8 ) Classification : High speed tool steel
Chemical composition in % of the material R9M4K8 ( R9M4K8, Ð9Ì4Ê8 ) . C Si Mn Ni S P Cr Mo W V Co 1 - 1.1 max 0.5 max 0.5 max 0.4 max 0.03 max 0.03 3 - 3.6 3.8 - 4.3 8.5 - 9.5 2.3 - 2.7 7.5 - 8.5
Temperature of critical points of the grade R9M4K8 ( R9M4K8, Ð9Ì4Ê8 ).
Ac1 = 800 , Ac3 (Acm ) = 840 , Ar3 (Arcm ) = 790 , Ar1 = 750
Mechanical properties under Ò=20o Ñ of the material R9M4K8 ( R9M4K8, Ð9Ì4Ê8 ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - 960 540 7 10 80 As-delivered state
Brinell hardness of the material R9M4K8 ( R9M4K8, Ð9Ì4Ê8 ) (annealing) , HB 10 -1 = 285 MPa
Physical properties of the material R9M4K8 ( R9M4K8, Ð9Ì4Ê8 ) . 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 2.29 8300 100 25 200 27 300 28 400 29 500 30 600 31 700 32 800 900 32 T E 10- 5 a 10 6 l r C R 10 9
Specification :
Mechanical properties : s â - 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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