Yellow Brass (UNS C26800)

Topics Covered

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

Introduction

Yellow Brass UNS C26800 is a copper zinc alloy which is basically used for hot or cold formed products. Higher thermal conductivity of brass makes it ideal for heat exchangers. Altering the composition of the alloy allows brass to change into desired colors preferred by architects.

The following datasheet gives an overview of the chemical composition and properties of yellow brass UNS C26800.

Chemical Composition

The chemical composition of yellow brass UNS C26800 is detailed in the following table.

Element Content(%)
Iron, Fe ≤ 0.050
Lead, Pb ≤ 0.15
Zinc, Zn 31.3 - 36.0
Copper, Cu 65.0

Physical Properties

The following table gives the physical properties of the UNS C26800.

Properties Metric Imperial
Density 8.47 g/cm3 0.306 lb/in3
Melting point 904°C 1660°F

Mechanical Properties

The mechanical properties of the UNS C26800 are discussed below.

Properties Metric Imperial
Hardness, Rockwell F 58 58
Hardness, HR30T 15 15
Tensile strength, 315 MPa 45700 psi
Yeild strength 97.0 MPa 14100 psi
Elongation at break 65.00% 65.00%
Shear strength 220 MPa 31900 psi

Thermal Properties

The following table provides the thermal properties of the UNS C26800.

Properties Metric Imperial
Thermal expansion co-efficient (@20-300°C/68-572°F) 20.3 µm/m°C 11.30 µin/in°F
Thermal conductivity(@20°C/68°F) 116.0 W/mK 67 BTU in/hr.ft².°F

Other Designations

The equivalent designations to UNS C26800 include:

  • ASTM B36
  • ASTM B587
  • MIL W-6712
  • SAE J461
  • SAE J463

Fabrication and Heat Treatment

Machinability

The UNS C26800 alloy has a machinability rate of 30.

Welding

The preferred welding techniques for the UNS C26800 include soldering, brazing, oxyacetylene welding, gas shielded arc welding, butt welding and spot welding. Seam welding and coated metal arc welding are not recommended for the UNS C26800.

Hot Working

The UNS C26800 performs poorly when hot formed.

Cold Working

The UNS C26800 has an excellent cold working property.

Annealing

Annealing of the UNS C26800 is done at temperatures ranging between 526 and 1026ºC (800 and 1300ºF).

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