IS 291 GR II
IS 291 Gr II Naval Brass finds prominent application in diverse sectors, primarily for machine hardware, screw machine products, and valve stems. This variant, IS 291 Gr II Naval Brass, stands out as an excellent option for operations involving hot forging, pressing, and machining. Boasting elevated ductility, this naval brass variant also excels in terms of both electrical and thermal conductivity. Moreover, IS 291 Gr II Naval Brass demonstrates commendable resistance to creep and impressive impact strength.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 59.00 | 62.00 |
| Pb | 0.50 | 1.00 |
| Sn | 0.50 | 1.00 |
| Fe | – | 0.10 |
| Total | – | 0.20 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO IS 291 GR II (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 | 390 | – | 15 | – | – |
| Hex (A/F) | 3 | 65 | 390 | – | 15 | – | – |
| Square (A/F) | 3 | 60 | 390 | – | 15 | – | – |
| Rectangle (Thickness) | 3 | 50 | 390 | – | 15 | – | – |
| PHYSICAL PROPERTIES | |
| Melting Point – Liquidus°F | 1650 |
| Melting Point – Solidus°F | 1630 |
| Density lb/cu in. at 68°F | 0.305 |
| Specific Gravity | 8.44 |
| Electrical Conductivity % IACS at 68°F | 26 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 67 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.8 |
| 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 | Good |
| Oxyacetylene Welding | Not Recommended |
| Gas Shielded Arc Welding | Not Recommended |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Not Recommended |
| Seam Weld | Not Recommended |
| Butt Weld | Fair |
| Capacity for Being Cold Worked | Poor |
| Capacity for Being Hot Formed | Good |
| Forgeability Rating | 90 |
| Machinability Rating | 70 |
