Leaded Tin Bronze – Copper Casting Alloy UNS C92700

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Welding
     Machinability
     Heat Treatment

Introduction

Bronze alloys are many in number and they include:

  • Phosphor bronze
  • Tin bronze
  • Aluminum bronze
  • Silicon bronze
  • Architectural bronze
  • Manganese bronze

The UNS C92700 alloy is a leaded tin bronze, copper casting alloy. The datasheet given below provides an overview of the UNS C92700 alloy.

Chemical Composition

The chemical composition of the UNS C92700 alloy is outlined in the following table.

Element Content (%)
Copper, Cu 86.0-89.0
Tin, Sn 9.0-11.0
Lead, Pb 1.0-2.50
Nickel, Ni 1.0
Zinc, Zn 0.70
Phosphorus, P 0.25
Iron, Fe 0.15
Aluminium, Al 0.0050

Physical Properties

The following table shows the physical properties of the UNS C92700 alloy.

Properties Metric Imperial
Density 8.80 g/cm³ 0.318 lb/in³

Mechanical Properties

The mechanical properties of the UNS C92700 copper alloy are displayed in the following table.

Properties Metric Imperial
Hardness, Brinell 77 77
Tensile strength 290 MPa 42100 psi
Yield strength (@strain 0.500%) 145 MPa 21000 psi
Elongation at break (in 50 mm) 20.00% 20.00%
Machinability (UNS C36000 (free-cutting brass) = 100) 45 45
Poisson's ratio 0.34 0.34
Elastic modulus 117 GPa 16969 ksi

Thermal Properties

The thermal properties of the UNS C92700 alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@20-177°C/68-351°F) 18.0 µm/m°C 10.0 µin/in°F

Other Designations

Analyze Your Metals | Request a Quote

Equivalent materials to the UNS C92700 alloy are:

  • ASTM B30
  • ASTM B505
  • QQ C390
  • SAE J461
  • SAE J462

Fabrication and Heat Treatment

Welding

Welding processes suitable for the UNS C92700 copper alloy include brazing and soldering. Welding processes not recommended for this alloy include gas shielded arc welding, carbon arc welding, coated metal arc welding and oxyacetylene welding.

Machinability

The machinability rating of the UNS C92700 alloy is 45.

Heat Treatment

The UNS C92700 alloy has stress relieving temperature of 260°C (500°F). Work pieces should be soaked at the the stress relieving temperature for one hour per inch of work piece thickness.

This alloy does not react to heat treatment.

Tell Us What You Think

Do you have a review, update or anything you would like to add to this article?

Leave your feedback
Your comment type
Submit