291 GR II
IS 291 Gr II naval brass. Mostly used for machine hardware, screw machine products and valve stems, CZ134 naval brass is great for hot forging and pressing and machining. With high ductility, naval brass has excellent electrical and thermal conductivity. IS 291 Gr II naval brass having good creep resistance and high 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 Others | - | 0.20 |
| Zn | Remainder | |
Mechanical Properties According To IS 291 Gr II (As Per Temper HB)
| Range (mm) | From | To | UTS Min (MPa) | UTS Max (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 | - | - | - | 15 | - | - |
| PHYSICAL PROPERTIES | |
|---|---|
| Melting Point - Liquidus°F | 1650 |
| Melting Point – Solidus °F | 1630 |
| Density lb/cu in. at 68 0F | 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 |
TYPICAL USES
- Fasteners
- Industrial
- Marine