CW711R
CW711R, categorized as naval brass, is predominantly employed in machine hardware, screw machine products, and valve stems. This specific variant, known as CW711R naval brass, holds significant suitability for hot forging, pressing, and machining procedures. Bolstered by heightened ductility, naval brass displays outstanding electrical and thermal conductivity. Additionally, CW711R naval brass exhibits commendable resistance to creep and remarkably high impact strength.
Distinguishing itself from CW712R naval brass, CW711R is characterized by a lower copper and tin content while featuring a relatively higher Lead percentage. Despite this variation in chemical composition, CW711R shares almost identical properties with CW712R, making it adept at withstanding corrosion and well-suited for hot forming applications.
CHEMICAL COMPOSITION
Elements | Min (%) | Max (%) |
Cu | 59.50 | 61.50 |
Pb | 1.30 | 2.20 |
Fe | – | 0.10 |
Sn | 0.50 | 1.00 |
Ni | – | 0.30 |
Total Others | – | 0.20 |
Zn | Remainder |
MECHANICAL PROPERTIES ACCORDING TO EN 12164 (AS PER TEMPER R410)
Range (mm) | From | To | UTS Min (N/mm²) | PS Min (N/mm²) | Elongation Min (%) | Hardness Min | Hardness Max |
Round (Dia) | 2 | 50 | 410 | – | 18 | – | – |
Hex (A/F) | 3 | 50 | 410 | – | 18 | – | – |
Square (A/F) | 3 | 50 | 410 | – | 18 | – | – |
Rectangle (Thickness) | 3 | 50 | 410 | – | 18 | – | – |
PHYSICAL PROPERTIES | |
Melting Points – Liquidus 0F | 1650 |
Melting Points – Solidus 0F | 1630 |
Density lb/cu in. at 68 0F | 0.305 |
Specific Gravity | 8.44 |
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 | 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 |