Architectural Bronze UNS C38500

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Annealing
     Cold Working
     Welding
     Forging
     Machinability
     Hot Working
Applications

Introduction

Architectural bronze alloys enhance the inside and outside appearances of buildings and last for a long time. They are available in many forms and are generally completed by waxing.

UNS C38500 architectural bronze alloys have a yellow-gold color. The following datasheet provides an overview of UNS C38500 bronze alloys.

Chemical Composition

The chemical composition of UNS C38500 architectural bronze alloys is outlined in the following table.

Element Content (%)
Cu 57.0
Pb 3.0
Zn 40.0

Physical Properties

The following table shows the physical properties of UNS C38500 architectural bronze alloys.

Properties Metric Imperial
Density 8.47 g/cm3 0.306 lb/in³

Mechanical Properties

The mechanical properties of UNS C38500 architectural bronze alloys are displayed in the following table.

Properties Metric Imperial
Hardness, Rockwell B (M30 temper) 65 65
Tensile strength (M30 temper) 415 MPa 60200 psi
Yield strength (@strain 0.500%, M30 temper) 140 MPa 20300 psi
Elongation at break (in 50 mm, M30 temper) 30.00% 30.00%
Machinability (UNS C36000 (free-cutting brass) = 100) 90 90
Shear modulus 37.0 GPa 5370 ksi
Shear strength (M30 temper) 240 MPa 34800 psi
Poisson's ratio 0.34 0.34
Elastic modulus 117 GPa 16969 ksi

Thermal Properties

The thermal properties of UNS C38500 architectural bronze alloys are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@20-300°C/68-572°F) 20.9 µm/m°C 11.6 µin/in°F
Thermal conductivity (@20°C/68°F) 123 W/mK 854 BTU in/hr.ft².°F

Other Designations

Equivalent materials to UNS C38500 architectural bronze alloys are ASTM B455 alloys.

Fabrication and Heat Treatment

Annealing

UNS C38500 architectural bronze alloys are annealed between 427 and 593°C (800 and 1100°F).

Cold Working

UNS C38500 bronze alloys have poor cold working capacity.

Welding

Brazing and soldering processes are recommended for UNS C38500 bronze alloys. Welding processes not recommended for these alloys include spot welding, gas shielded arc welding, seam welding, coated metal arc welding and oxyacetylene welding

Forging

UNS C38500 bronze alloys can be forged between 621 and 732°C (1150 and 1350°F).

Machinability

UNS C38500 bronze alloys have a machinability rating of 90.

Hot Working

UNS C38500 bronze alloys have excellent hot forming capacity.

Applications

UNS C38500 architectural bronze alloys are used for trim and architectural hardware.

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