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C4641
C4641
JIS C4641 (standardized under Japanese Industrial Standard JIS H 3250 for copper and copper alloy rods and bars) is the standard Japanese specification for Naval Brass. Engineered on a duplex (α + β) 60/40 copper-zinc matrix, it incorporates approximately 0.7% to 1.2% Tin (Sn) to deliver high resistance against dezincification and seawater corrosion. It is widely used across East Asian shipbuilding, offshore installations, power generation, and coastal fluid-handling equipment.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 59.00 | 62.00 |
Pb | – | 0.50 |
Sn | 0.50 | 1.00 |
Fe | – | 0.20 |
Zn | Remainder | |
Mechanical Properties According To EN 12165 (As Per Temper H080)
Range (mm) |
From |
To |
UTS Min (MPa) |
PS Min |
Elongation Min (%) |
Hardness Min (HRB) |
Hardness Max (HRB) |
| 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 Points – Liquidus 0F | 1650 |
| Melting Points – Solidus 0F | 1630 |
| Density lb/cu in. at 68 0F | 0.304 |
| Specific Gravity | 8.41 |
| Electrical Conductivity % IACS at 68 0F | 26 |
| Thermal conductivity Btu/ Sq ft / ft hr / 0F at 680F | 67 |
| Coefficient of Thermal Expansion 68-57210 -6 Per 0F (68-5720F) | 11.8 |
| Specific Heat capacity Btu/ lb /0F at 680F | 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 Are Welding | Fair |
| Coated Metal Are Welding | Not Recommended |
| Spot Weld | Good |
| Seam Weld | Fair |
| Butt Weld | Good |
| Capacity for Being Cold Worked | Fair |
| Capacity for Being Hot Formed | Excellent |
| Forgeability Rating | 90 |
| Machinability Rating | 30 |
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