Metals -> Bronze -> Tin-free pressure-worked bronzes Characteristics of the material BrÀ7 ( BrÀ7, ÁðÀ7 ).
Material : BrÀ7 ( BrÀ7, ÁðÀ7 ) Classification : Tin-free pressure-worked bronzes
Chemical composition in % of the material BrÀ7 ( BrÀ7, ÁðÀ7 ) . Fe Si Mn P Al Cu Pb Zn Sn Impurity max 0.5 max 0.1 max 0.5 max 0.01 6 - 8 90.9 - 94 max 0.03 max 0.5 max 0.1 all 1.1
Comment: Cu is a basis; the percentage of Cu is given approximately. Mechanical properties under Ò=20o Ñ of the material BrÀ7 ( BrÀ7, ÁðÀ7 ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - soft 440-500 65-75 soft 950-1030 2-4
Brinell hardness of the material BrÀ7 ( BrÀ7, ÁðÀ7 ) , soft HB 10 -1 = 65 - 75 MPa Brinell hardness of the material BrÀ7 ( BrÀ7, ÁðÀ7 ) , hard HB 10 -1 = 200 - 220 MPa
Physical properties of the material BrÀ7 ( BrÀ7, ÁðÀ7 ) . 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 1.2 80 7800 110 100 17.8
Friction coefficient of the material BrÀ7 ( BrÀ7, ÁðÀ7 ) . Friction coefficient with oil
: 0.012
Technological properties of the material BrÀ7 ( BrÀ7, ÁðÀ7 ) . Melting temperature, °C : 1040 Forging temperature,°C : 750 - 850 Annealing temperature, °C : 600 - 700
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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