Metals -> Copper-zinc alloy (latten, brass) -> Copper-zinc alloys pressure treated Characteristics of the material LÀ77-2 ( LÀ77-2, ËÀ77-2 ).
Material : LÀ77-2 ( LÀ77-2, ËÀ77-2 ) Classification : Copper-zinc alloys pressure treated
Chemical composition in % of the material LÀ77-2 ( LÀ77-2, ËÀ77-2 ) . Fe P Al Cu Pb Zn Sb Bi Impurity max 0.07 max 0.01 1.75 - 2.5 76 - 79 max 0.07 18.2 - 22.25 max 0.005 max 0.002 all 0.3
Comment: Zn is a basis; the percentage of Zn is given approximately. Mechanical properties under Ò=20o Ñ of the material LÀ77-2 ( LÀ77-2, ËÀ77-2 ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - hard 550-650 7-11 soft 350-450 45-52
Brinell hardness of the material LÀ77-2 ( LÀ77-2, ËÀ77-2 ) , hard HB 10 -1 = 150 - 160 MPa Brinell hardness of the material LÀ77-2 ( LÀ77-2, ËÀ77-2 ) , soft HB 10 -1 = 45 - 55 MPa
Physical properties of the material LÀ77-2 ( LÀ77-2, ËÀ77-2 ) . 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 1.02 18.3 113 8600 75
Technological properties of the material LÀ77-2 ( LÀ77-2, ËÀ77-2 ) . Melting temperature, °C : 1000 Forging temperature,°C : 720 - 770 Annealing temperature, °C : 600 - 650
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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