High Tensile Manganese Bronze , SAE 430B , CDA 863
Chemical Composition % by weight
Element
Nominal
Minimum
Maximum
Aluminum
6
5
7.5
Copper
63
60
66
Iron
3
2
4
Lead
-
-
.20
Manganese
3
2.5
5
Nickel
-
-
1
Tin
-
-
.20
Zinc
25
22
28
Applications
Extra heavy duty high strength alloy for large valve stems, gears, cams, slow speed heavy load bearings, screw down nuts, hydraulic cylinder parts.
Mechanical Properties
M07 - As Continuous Cast
Hardness*
Brinell Hardness (500 kg load)
225
Tensile Strength**
KSI
110 min
Yield Strength **
KSI (0.5% Ext. under load)
62 min
Elongation**
% in 2 inch
14
**Test values are nominal approximations and depend on specimen size and orientation.
Physical Properties
Thermal Conductivity
BTU/ (sq ft-ft-hr-F)
20.5
Specific Heat
BTU/lb/ºF @ 68F
.09
Thermal Expansion
Per °F from 68 F to 572 F
.000012
Density
lb/cu in @ 68 F
.283
Electrical Conductivity* (Annealed)
% IACS @ 68 F
8
Modulus of Elasticity
KSI
14,200
*Volume basis
Fabrication Practices
Stress relieving temperature
500 F or 260 C
Time at temperature
1 hour per inch of section thickness
Responds to heat treatment
No
Machinability rating (Free Cutting Brass=100)
20
Suitability for being joined by:
Soldering/Poor
Brazing/Poor
Oxyacetylene Welding/Poor
Gas Shielded Arc Welding/Poor
Coated Metal Arc Welding/Good
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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C86300 Manganese Bronze
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