High Leaded Tin Bronze Cast Alloys – Copper Tin Lead Alloys (UNS C90200 to C91700)

Nov 13 2012

Topics Covered

Introduction
Composition

Introduction

UNS C90200 to C91700 are the designations allotted to the cast tin bronzes or copper tin alloys that have excellent corrosion resistance. When placed against steel, tin bronzes exhibit high wear resistance and low friction. Tin bronzes are more ductile and strong than semi red and red brasses. Copper tin alloys are as single phase alloys because of their slow transformations or absence of transformations when placed under room temperature.

Tin is a solid solution strengthener in copper, and lead improves pressure tightness and machinability and decreases ductility and tensile strength of the tin bronzes when added to the tin bronzes. A balance is maintained between strength and machinability of the tin bronzes by adjusting the composition of copper tin alloys.

C92200 to C94500 are the designations of cast leaded tin bronzes under the UNS. High leaded tin bronze cast alloys comprise a slow fail mechanism that prevents seizing and galling on a temporary basis. Lead leaks out of the alloy and gets smeared over the journal’s surface during the working of this mechanism. The leaded tin bronzes and the nonleaded tin bronzes comprise similar microstructures.

Dendrites available in the microstructure of the cast tin bronzes increase tin content because of their composition gradient. Formation of delta and alpha phases takes place when the last liquid to be solidified is improved with the usage of tin through a cooling process.

Composition

The composition of high leaded tin bronze cast alloys is outlined in the following table.

Copper Alloy No. Cu Sn Pb Zn Fe Sb Ni S P Al Si Other Named Elements Status Inactive Date
C931001 Rem.2 6.5-8.5 2.0-5.0 2.0 .25 .25 1.03 .05 .304 .005 .005 - Active
C932001 81.0-85.02 6.3-7.5 6.0-8.0 1.0-4.0 .20 .35 1.03 .08 .154 .005 .005 - Active
C934001 82.0-85.02 7.0-9.0 7.0-9.0 .8 .20 .50 1.03 .08 .504 .005 .005 - Active
C935001 83.0-86.02 4.3-6.0 8.0-10.0 2.0 .20 .30 1.03 .08 .054 .005 .005 - Active
C936005 79.0-83.0 6.0-8.0 11.0- 13.0 1.0 .20 .55 1.03 .08 .154 .005 .005 - Active
C937001 78.0-82.0 9.0-11.0 8.0- 11.0 .8 .76 .50 .503 .08 .104 .005 .005 - Active
C937201 83.0min 3.5-4.5 7.0-9.0 4.0 .7 .50 .503 - .104 - - - Active
C938001 75.0-79.0 6.3-7.5 13.0- 16.0 .8 .15 .8 1.03 .08 .054 .005 .005 - Active
C939007 76.5-79.5 5.0-7.0 14.0-18.0 1.5 .40 .50 .83 .08 1.54 .005 .005 - Active
C940008 69.0-72.0 12.0-14.0 14.0-16.0 .50 .25 .50 .50-1.03 .089 .054 .005 .005 - Active
C941008 72.0-79.0 4.5-6.5 18.0- 22.0 1.0 .25 .8 1.03 .089 .504 .005 .005 - Active
C943001 67.0-72.0 4.5-6.0 23.0- 27.0 .8 .15 .8 1.03 .089 .084 .005 .005 - Active
C943101 Rem. 1.5-3.0 27.0-34.0 .50 .50 .50 .25-1.03 - .054 - - - Active
C943201 Rem. 4.0-7.0 24.0-32.0 - .35 - - - - - - - Active
C943301 68.5-75.5 3.0-4.0 21.0-25.0 3.0 .7 .50 .503 - .104 - - - Active
C944001 Rem. 7.0-9.0 9.0- 12.0 .8 .15 .8 1.03 .08 .504 .005 .005 - Active
C945001 Rem. 6.0-8.0 16.0- 22.0 1.2 .15 .8 1.03 .08 .054 .005 .005 - Active

1Cu + Sum of named elements, 99.0% min.
2In determining Cu min., Cu may be calculated as Cu + Ni.
3Ni value includes Co.
4For continuous castings, P shall be 1.5%, max.
5Cu + Sum of named elements, 99.3% min.
6Fe shall be .35% max., when used for steel-backed.
7Cu + Sum of named elements, 98.9% min.
8Cu + Sum of named elements, 98.7% min.
9For continuous castings, S shall be .25% max.

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