Need Help?
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Download Our Brochure
IS 6921 FNB
IS 6921 FNB, commonly recognized as Naval Brass, is frequently utilized across a diverse array of marine and subsea applications. Esteemed for its exceptional combination of superior strength and robust corrosion resistance, this brass alloy further boasts effective property retention even under cryogenic conditions. Notably, IS 6921 FNB demonstrates excellent hot formability and showcases a highly commendable level of corrosion resistance.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 61.00 | 64.00 |
| Pb | – | 0.20 |
| Sn | 1.00 | 1.50 |
| Fe | – | 0.10 |
| Total | – | 0.50 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO IS 6921 (AS PER TEMPER HB)
| Range (mm) | From | To | UTS Min (MPa) | PS Min (MPa) | Elongation Min (%) | Hardness Min | Hardness Max |
| Round (Dia) | 1.5 | 75 | 340 | – | 15 | – | – |
| Hex (A/F) | 3 | 70 | 340 | – | 15 | – | – |
| Square (A/F) | 3 | 60 | 340 | – | 15 | – | – |
| Rectangle (Thickness) | 3 | 50 | 340 | – | 15 | – | – |
| 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 conductivityBtu/ 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 |
| Capacity for being cold Worked | Fair |
| Hot Worked | Excellent |
| Machinability Rating | 30% |
| Forge ability Rating | 90% |
| Silver Alloy Brazing | Excellent |
| Soft Soldering | Excellent |
| Oxyacetylene Welding | Good |
