Manganese Bronze Alloys: High Strength Yellow Brass
C86200, C86300, C86500
The term “manganese bronze” which is used commercially to describe the high strength yellow brasses is somewhat misleading. Actually, they are not bronzes, nor does the amount of manganese they contain have any significant effect upon the structure of the alloys. The high-strength yellow brasses are basically alloys of copper and zinc to which varying amounts of other elements are added. These additions produce high strength combined with excellent corrosion resistance properties. The alloys are relatively easy to cast, but due to their solidification characteristics which lead to the formation of gross shrinkage concentration instead of dispersed shrinkage porosity, care must be exercised in gating and rising practice.
Manganese Bronze
| Typical Bronze & Brass Alloys | … | Suitability for being joined by: | … | … | … | Typical Mechanical Properties | ||||||||||||||||||||||||||||||||
| CA# | Ingot # |
Previous Trade
Name |
Alloy Name | Nominal Composition | ASTM | Federal | Former Federal | Military | Approx. Weight, lb./in.3 | Soldering | Brazing | Castability (Ranked 1-8, 1 is the best or highest) | Fluidity (Ranked 1-8, 1 is the best or highest) |
Machinability Rating
(Free Cutting Brass = 100) |
Tensile Strength, ksi | Yield Strength, ksi | Elongation, Percentage in 2 in. | Shear Strength, ksi | Fatigue Strength (100 million cycles), ksi | Brinell Hardness (500-kg Load) *(3000-kg Load) | Shrinkage Allowance | Pattern Maker's Shrinkage | ||||||||||||||||
| 862 | 423 | High Strength Yellow Brass | Manganese Bronze | 90,000 Tensile | B30, B22, B271, B505, B584 | QQ-C-523, QQ-C-390 | QQ-B-726, QQ-C-390 | MIL-C-11866, MIL-C-22229 | 0.288 | Poor | Poor | 6 | 2 | 30 | 95 | 48 | 20 | … | … | 180 | 2% | … | ||||||||||||||||
| 863 | 424 | High Strength Yellow Brass | Manganese Bronze | 110,000 Tensile | B30, B22, B271, B505, B584 | QQ-C-523, QQ-C-390 | QQ-B-726, QQ-C-390 | MIL-C-11866, MIL-C-15345, MIL-C-22087, MIL-C-22229 | 0.283 | Poor | Poor | 6 | 2 | 8 | 119 | 83 | 18 | … | 25 | 225 | 2.30% | … | ||||||||||||||||
| 865 | 421 | High Strength Yellow Brass | Manganese Bronze | 65,000 Tensile | B30, B176, B271, B505, B584 | QQ-C-523, QQ-C-390 | QQ-B-726, QQ-C-390 | MIL-C-15345, MIL-C-22087, MIL-C-22229 | 0.301 | Fair | Fair | 6 | 2 | 26 | 71 | 28 | 30 | … | 20 | 100 | 1.90% | 1.65% to 2.15% | ||||||||||||||||
Typical Bronze & Brass Alloys
| CA# | Ingot # | Previous Trade Name | Alloy Name | Nominal Composition | Applications |
| 862 | 423 | High Strength Yellow Brass | Manganese Bronze | 90,000 Tensile | Marine castings, gears, gun mounts, bushings and bearings. |
| 863 | 424 | High Strength Yellow Brass | Manganese Bronze | 110,000 Tensile | Extra-heavy duty, high strength alloy for gears, cams, bearings, screw-down nuts, bridge parts, hydraulic cylinder parts. (Not to be used in marine, ammonia or high corrosive atmospheres) |
| 865 | 421 | High Strength Yellow Brass | Manganese Bronze | 65,000 Tensile | Propeller hubs, blades and other parts in contact with salt and fresh water, gears, liners. |
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