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C2800
C2800
JIS C2800 (standardized under JIS H 3250 for brass rods and bars, JIS H 3100 for brass sheets, plates, and strips, and JIS H 3300 for tubes; historically known as Muntz Metal or CuZn40) is a classic (α + β) duplex structural brass. Formulated with 59.0% to 63.0% copper and a zinc balance, C28000 sits on the threshold where the microstructural phase balance transitions from a single-phase alpha matrix into a dual-phase alpha-beta structure. This higher proportion of the harder, more rigid beta (β) phase gives JIS C2800 higher tensile strength, structural rigidity, and hot workability than traditional alpha brasses, making it the premier Japanese industrial standard alloy for heavy plates, structural shapes, heat exchanger tubesheets, and hot-forged architectural components.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 59.00 | 63.00 |
Pb | – | 0.10 |
Fe | – | 0.07 |
Zn | Remainder | |
Mechanical Properties According To BS 271 (As Per Temper 1/2 H)
Range (mm) |
From |
To |
UTS Min (Mpa) |
PS Min |
Elongation Min (%) |
Hardness Min |
Hardness Max |
| Round (Dia) | 1.5 |
75 |
375 |
– |
10 |
– |
– |
| Hex (A/F) | 3 |
70 |
375 |
– |
10 |
– |
– |
| Square (A/F) | 3 |
60 |
375 |
– |
10 |
– |
– |
| Rectangle (Thickness) | 3 |
50 |
375 |
– |
10 |
– |
– |
PHYSICAL PROPERTIES |
|
| Melting Point – Liquidus°F | 1660 |
| Melting Point – Solidus°F | 1650 |
| Density lb/cu in. at 68°F | 0.303 |
| Specific Gravity | 8.39 |
| Electrical Conductivity % IACS at 68°F | 28 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 71 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.6 |
| Specific Heat Capacity Btu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tension ksi | 15000 |
| Modulus of Rigidity ksi | 5600 |
FABRICATION PROPERTIES |
|
| Technique | Suitability |
| Soldering | Excellent |
| Brazing | Excellent |
| Oxyacetylene Welding | Good |
| Gas Shielded Arc Welding | Fair |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Good |
| Seam Weld | Not Recommended |
| Butt Weld | Good |
| Capacity for Being Cold Worked | Fair |
| Capacity for Being Hot Formed | Excellent |
| Forgeability Rating | 90 |
| Machinability Rating | 40 |
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