Silicon Red Brass UNS C69400

Topics Covered

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

Introduction

Brass includes a broad range of copper-zinc alloys having a variety of properties such as ductility, wear-resistance, color, machinability, strength, hardness, antimicrobial, corrosion-resistance, and electrical and thermal conductivity. UNS C69400 silicon red brass alloy is one of the types of brass, which have hot forgeability, high strength and good corrosion resistance.

The following datasheet will provide more details about UNS C69400 silicon red brass alloy.

Chemical Composition

The following table shows the chemical composition of UNS C69400 silicon red brass alloy.

Element Content (%)
Cu, Copper 81.5
Si, Silicon 4.0
Zn, Zinc 14.5

Physical Properties

The physical properties of UNS C69400 silicon red brass alloy are outlined in the following table.

Properties Metric Imperial
Density 8.19 g/cm3 0.296 lb/in³
Melting point 821°C 1510°F

Mechanical Properties

The mechanical properties of UNS C69400 silicon red brass alloy are tabulated below.

Properties Metric Imperial
Tensile strength 565-896 MPa 81900-130000 psi
Yield strength (depending on temper) 276-393 MPa 40000-57000 psi
Elongation at break (in 508 mm) 25.00% 25.00%
Elastic modulus 117 GPa 17000 ksi
Poisson’s ratio 0.34 0.34
Machinability (UNS C36000 (free-cutting brass) = 100) 30 30

Thermal Properties

The thermal properties of UNS C69400 silicon red brass alloys are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (at 20-300°C/68-572°F) 20.2 µm/m°C 11.2 µin/in°F
Thermal conductivity 26 W/mK 180 BTU in/hr.ft².°F

Other Designations

Equivalent material to UNS C69400 silicon red brass alloy is ASTM B371.

Fabrication and Heat Treatment

Machinability

The machinability rate of UNS C69400 silicon red brass alloys is 30.

Welding

Soldering, brazing, oxyacetylene welding, spot welding, seam welding, and butt welding are considered as suitable welding processes for UNS C69400 alloy.

Forging

UNS C69400 alloy has a hot forgeability rating of 80 with the recommended hot working temperature ranging between 649 and 871°C (1200 and 1600°F).

Hot Working

The hot working capacity of UNS C69400 silicon red brass alloy is excellent.

Cold Working

The cold working capacity of UNS C69400 is poor.

Annealing

The annealing temperature of UNS C69400 silicon red brass alloy is between and 427 and 649°C (800 and 1200°F).

Applications

UNS C69400 silicon red brass alloy is used in heavy-duty mechanical components such as bearings, and used for pump components and valve stems.

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