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Rod, wire, sheet, strip made of CuSn4Zn4Pb3

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

Element Content
Al ≤ 0,002
Pb 1.5 — 3.5
P ≤ 0,03
Fe ≤ 0,05
Sb ≤ 0,002
Sn 3 — 5
Zn 3 — 5
Bi ≤ 0,002

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.

Main properties:

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

Bronze characteristics

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)

KCU kJ/m2

Soft alloy 300−350     35−45      
Hard alloy 550−650     2−4      

Physical characteristics of alloy grade



R 10 9(Ohm-m)

a 10 -6 (1/Degree)

E 10 -5 (MPa)

T (Degree)
8900 84 90   0,75 20
      18,2   100
Description Identification Description Identification
— 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 — 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 — 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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