Rod, wire, sheet, strip made of CuSn4Zn4Pb3
|Grade||analogue||W. Nr.||Aisi Uns||En||Order|
|БрОЦС4-4-2.5||Delivery from the stock, in stock|
Bronze alloy CuSn4Zn4Pb3
Grade: tinless, pressure-treated bronze.
Industrial usage: shims and bushings for cars, trucks.
Percentage composition of CuSn4Zn4Pb3 according to GOST 613−79
|Pb||1.5 — 3.5|
|Sn||3 — 5|
|Zn||3 — 5|
Solid solution forms during of process of copper and tin melting. It is prone to segregation because of a high temperature interval of crystallization. Alloys that contain more than 5% of tin have eutectoid component E (a + d) in their structure due to segregation. This component consists of hard and soft phases. Structure of this alloy is beneficial for parts of sleeve bearings. Solid particles provide wear resistance. Soft phase gives excellent conformability due to which tin bronzes are excellent anti-friction materials.
Coefficient of friction with lubricant = 0.016
Coefficient of friction without lubricant = 0.26
Alloy hardness: HB 10 -1 = 50 — 70 MPа
Point of melting = 1018°C
Tin bronze CuSn4Zn4Pb3 has increased anti-friction qualities. It is non-magnetic, cold-resistant, insensitive to overheating, have a minimum volumetric shrink-off (approximately 0.8%). Due to this, it is widely used in art casting. The main demerit of tin bronzes is formation of small reeds in castings, which can lead to decrease of hydraulic soundness. Tin bronzes can be alloyed with plumb, zinc, nickel, phosphorus.
Mechanical characteristics at a temperature of 20 °C.
|Mill-products||σv (MPa)||Size||ψ %||δ5 (%)||F.e.||sT (MPa)|
Physical characteristics of alloy grade
R 10 9(Ohm-m)
a 10 -6 (1/Degree)
E 10 -5 (MPa)
|— differential deposit at a process of the first crack appearing, %||å||— ultimate tensile strength (rupture strength), MPa||σv|
|— maximum shear stress, ultimate torsional strength, MPa||Jê||— elastic strength, MPa||σ0,05|
|— ultimate bending strength, MPa||σ bend||— conventional yield limit, MPa||σ0,2|
|— fatigue endurance limit during torsion test with symmetrical load cycle, MPa||σ-1||— percentage elongation after rupture, %||δ5,δ4,δ10|
|— fatigue endurance limit during torsion test with symmetrical load cycle, MPa||J-1||— yield point (contraction), MPa||σc 0,05|
|— amount of load cycling||n||— relative shear, %||v|
|— specific electrical resistance, Ohm-m||R and ρ||— short ultimate tensile strength, MPa||sv|
|— standard module of elasticity HPa||E||— contraction ratio, %||ψ|
|— properties getting temperature, Degree||t°||— impact hardness, which is established on specimens with concentrators in accordance with V and U types, J/cm2||KCU and KCV|
|— heating capacity of alloy (heat conduction coefficient), V/(m°С)||l||— permanent change of form — yield point (proportionality), MPa||sT|
|— specific heat of alloy (temperature range is 20°С), [J/(kg-deg)]||C||— Brinell hardness||HB|
|— density, kg/m3||pn and r||— Vicker’s hardness||HV|
|— lineal thermal expansion coefficient (in a temperature range of 20°С), 1/°С||a||— Rockwell hardness C||HRC|
|— long-time strength limit, MPa||σtТ||— Rockwell hardness B||HRB|
|— module of elasticity at a process of torsional shear, HPa||G||— Shore hardness||HSD|
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