Metals -> Copper-zinc alloy (latten, brass) -> Copper-zinc alloys pressure treated Characteristics of the material L70 ( L70, Л70 ).
Material : L70 ( L70, Л70 ) Classification : Copper-zinc alloys pressure treated
Chemical composition in % of the material L70 ( L70, Л70 ) . Fe P Cu Pb Zn Sb Bi Impurity max 0.07 max 0.005 69 - 72 max 0.03 27.8 - 31 max 0.002 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 L70 ( L70, Л70 ) .
Assortment Dimension Direct. s в s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - hard 630-700 3-6 soft 300-350 50-60
Brinell hardness of the material L70 ( L70, Л70 ) , hard HB 10 -1 = 145 - 155 MPa Brinell hardness of the material L70 ( L70, Л70 ) , soft HB 10 -1 = 55 - 65 MPa
Physical properties of the material L70 ( L70, Л70 ) . 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 1.15 121.4 8610 69 100 18.9 376.8
Technological properties of the material L70 ( L70, Л70 ) . Melting temperature, °C : 950 Forging temperature,°C : 700 - 850 Annealing temperature, °C : 550 - 650
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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