Names formerly used (not recommended)
123, leaded Semi-Red Brass, Valve Composition Bronze 81-3-7-9
Chemical Composition % by weight
Element |
Nominal |
Minimum |
Maximum |
Aluminum |
- |
- |
.005 |
Antimony |
- |
- |
.25 |
Copper |
81 |
78.0 |
82.0 |
Iron |
- |
- |
.40 |
Lead |
7 |
6.0 |
8.0 |
Nickel |
- |
- |
1.0 |
Phosphorous |
- |
- |
.02 |
Silicon |
- |
- |
.005 |
Sulfur |
- |
- |
.08 |
Tin |
3 |
2.3 |
3.5 |
Zinc |
9 |
7.0 |
10.0 |
Typical Applications
General hardware, ornamental castings, plumbing supplies and fixtures, low pressure valves and fittings.
Mechanical Properties
Test Bar Values as Sand Cast
Property |
|
Minimum |
Typical |
Tensile Strength |
ksi |
29.0 |
34.0 |
Yield Strength |
ksi (0.5% Extension Under Load) |
13.0 |
15.0 |
Elongation |
% in 2 inches |
18.0 |
26.0 |
Hardness |
Brinell (500 kg Load) |
- |
55.0 |
Fabrication Practices
Suitability for being joined by: |
|
Soldering |
Excellent |
Brazing |
Good |
Oxyacetylene Welding |
Not Recommended |
Carbon Arc Welding |
Not Recommended |
Gas Shielded Arc welding |
Not Recommended |
Coated Metal Arc Welding |
Fair |
|
Machinability Rating
(Free Cutting Brass=100) |
90 |
C83600 (115) | C84400 (123) | C90300 (225) | C92300 (235) | C92200 (245) | C90700 (205) | C92900 (206A)
(319) Aluminum | (356) Aluminum | (535) Almag | C85400 (403) | C86500 (421) | C86300 (424)
C95400 (415C) | C87500 (500-13B) | C89833 (836) | C87850 (Eco Brass)
*Since brazing is performed at temperatures within the hot-short range, strain must be
avoided during the brazing and cooling of this alloy.
The values listed above represent reasonable approximations suitable for general engineering use.
Due to commercial variations in composition and to manufacturing limitations, they
should not
be used for specification purposes. See applicable A.S.T.M. specification references.
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