Metals -> Copper-zinc alloy (latten, brass) -> Copper-zinc alloys pressure treated Characteristics of the material L90 ( L90, Л90 ).
Material : L90 ( L90, Л90 ) Classification : Copper-zinc alloys pressure treated
Chemical composition in % of the material L90 ( L90, Л90 ) . Fe P Cu Pb Zn Sb Bi Impurity max 0.1 max 0.01 88 - 91 max 0.03 8.8 - 12 max 0.005 max 0.002 all 0.2
Comment: Zn is a basis; the percentage of Zn is given approximately. Mechanical properties under Т=20o С of the material L90 ( L90, Л90 ) .
Assortment Dimension Direct. s в s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - hard 440-520 2-4
Brinell hardness of the material L90 ( L90, Л90 ) , hard HB 10 -1 = 130 - 145 MPa Brinell hardness of the material L90 ( L90, Л90 ) , soft HB 10 -1 = 50 - 60 MPa
Physical properties of the material L90 ( L90, Л90 ) . 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 1.05 180 8780 45 100 17.1 398
Friction coefficient of the material L90 ( L90, Л90 ) . Friction coefficient with oil
: 0.074 Friction coefficient without oil
: 0.44
Technological properties of the material L90 ( L90, Л90 ) . Melting temperature, °C : 1045 Forging temperature,°C : 700 - 850 Annealing temperature, °C : 450 - 600
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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