UNS C69400 Silicon Red Brass

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

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

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

Cold Working

The cold working capacity of UNS C69400 is poor.

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

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

Category:

C69400 Product description: Silicon red brass

C69400 brass is a brass formulated for primary forming into wrought products. Cited properties are appropriate for the H04 (full hard) temper.

It has a moderately low thermal conductivity among wrought brasses. In addition, it has a moderately low electrical conductivity and a moderately low melting temperature.

The graph bars on the material properties cards below compare C69400 brass to: wrought brasses (top), all copper alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it’s 50% of the highest, and so on.

Typical uses

Industrial: valve stems

Similar or equivalent specification

CDAASTMSAEAMSFederalMilitaryOther
C69400B371
B371M

Chemical composition

Cu%1Pb%Zn%Fe%Si%
Chemical composition according to ASTM B371/B371M-19
1Cu value includes Ag.
Note: Cu + sum of named elements, 99.5% min. Single values represent maximums.
80.00-
83.00
0.30Rem.0.203.50-
4.50

Machinability

Copper alloy UNS No.Machinability ratingDensity (lb/in3 at 68 °F)
C69400300.296

Mechanical properties

Mechanical properties according to ASTM B371/B371M-19

C69400

H04 HARD

Size range: up to 1″ inclusive

Tensile strength, minYield strength, at 0.5% extension under load, minElongation, in 4x diameter or thickness of specimen, minRockwell “B” hardnessRemarks
ksiMPaksiMPa%typical BHN
80550402501595

Size range: over 1″ to 2″ inclusive

Tensile strength, minYield strength, at 0.5% extension under load, minElongation, in 4x diameter or thickness of specimen, minRockwell “B” hardnessRemarks
ksiMPaksiMPa%typical BHN
75515352411595

Size range: over 2″

Tensile strength, minYield strength, at 0.5% extension under load, minElongation, in 4x diameter or thickness of specimen, minRockwell “B” hardnessRemarks
ksiMPaksiMPa%typical BHN
65450352411595

Physical properties

Physical properties provided by CDA
US CustomaryMetric
Melting point – liquidus1685 °F918 °C
Melting point – solidus1510 °F821 °C
Density0.296 lb/in3 at 68 °F8.19 gm/cm3 at 20 °C
Specific gravity8.198.19
Electrical conductivity6.2% IACS at 68 °F0.04 MegaSiemens/cm at 20 °C
Thermal conductivity15 Btu/sq ft/ft hr/°F at 68 °F25.98 W/m at 20 °C
Coefficient of thermal expansion 68-57211.2 · 10-6 per °F (68-572 °F)19.3 · 10-6 per °C (20-300 °C)
Specific heat capacity0.09 Btu/lb/°F at 68 °F377.1 J/kg at 20 °C
Modulus of elasticity in tension16000 ksi110310 MPa

Fabrication properties

Fabrication properties provided by CDA
TechniqueSuitability
SolderingExcellent
BrazingExcellent
Oxyacetylene weldingGood
Spot weldGood
Seam weldGood
Butt weldGood
Capacity for being cold workedPoor
Capacity for being hot formedExcellent
Forgeability Rating80
Machinability rating30

Thermal properties

Thermal properties provided by CDA
*Temperature is measured in Fahrenheit.
TreatmentMinimum*Maximum*
Annealing8001200
Hot treatment12001600

Common fabrication processesForging, screw machining

Common fabrication processes provided by CDA