Names formerly used (not recommended):
421, High Strength Yellow Brass, 65,000 Tensile Manganese Bronze
Chemical Composition % by weight
Element |
Nominal |
Minimum |
Maximum |
Aluminum |
1 |
.50 |
1.5 |
Copper |
58 |
55.0 |
60.0 |
Iron |
1 |
.40 |
2.0 |
Lead |
- |
- |
.40 |
Manganese |
- |
.10 |
1.5 |
Nickel |
- |
- |
1.0 |
Tin |
.5 |
- |
1.0 |
Zinc |
39.5 |
36.0 |
42.0 |
Typical Applications
Machinery parts requiring strength and toughness, lever arms, valve stems, gears.
Mechanical Properties
Test Bar Values as Sand Cast
Property |
|
Minimum |
Typical |
Tensile Strength |
ksi |
65.0 |
71.0 |
Yield Strength |
ksi (0.5% Extension Under Load) |
25.0 |
28.0 |
Elongation |
% in 2 inches |
20.0 |
30.0 |
Hardness |
Brinell (500 kg Load) |
- |
100 |
Fabrication Practices
Suitability for being joined by: |
|
Soldering |
Fair |
Brazing |
Fair |
Oxyacetylene Welding |
Poor |
Carbon Arc Welding |
Poor |
Gas Shielded Arc welding |
Poor |
Coated Metal Arc Welding |
Poor |
|
Machinability Rating
(Free Cutting Brass=100) |
26 |
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. |
