Phosphor Bronze (sometimes sold with the shorter name Phos Bronze or P B Casting) is an alloy of copper with 3.5 to 10% of tin and a significant phosphorus content of up to 1%. The phosphorus is added as deoxidizing agent during melting. These alloys are notable for their toughness, strength, low coefficient of friction, and fine grain. The phosphorus also improves the fluidity of the molten metal and thereby improves the castability, and improves mechanical properties by cleaning up the grain boundaries.
Alloy | Cu | Fe | P | Sn | Zn | Metal Value $ | Density | Electrical Conductivity% IACS |
C510 | 94.9 | - | 0.2 | 5 | - | 1.15 | 0.32 | 15 |
C511 | 95.6 | - | 0.2 | 4.2 | - | 1.12 | 0.32 | 20 |
C521 | 92 | - | 0.19 | 8 | - | 1.24 | 0.318 | 13 |
C663 | 86 | 1.9 | 0.03 | 2.2 | 9.9 | 1.03 | 0.317 | 25 |
Grade B.S. 1400: 1985 | Nominal Composition | 2% PS N/mm Min | Tensile Strength N/mm Min | Elongation% Min | Brinell Hardness Min |
PB1 | 89/10/01 | 130 | 250 | 5 | 60 |
PB1 | 88/12 | 140 | 260 | 7 | 80 |
PB1 | 90/10 | 130 | 250 | 5 | 60 |
PB1 | 90.5/9.5 | 130 | 240 | 5 | 80 |
LPB-1 | 87/8/2/3 | 80 | 175 | 7 | 60 |
Pbc2 | 88/12 | 120 | 195 | 5 | 60 |
Pbc2b | 88/12 | 145 | 295 | 5 | 80 |
Copper Alloys | CU | SN | PB | ZN | FE | NI | P | AL | SI | Impurities | |
PB-1 Standard : BS 1400 | PB 1 | Rem | 10 Min | 0.25 | 0.05 | 0.1 | 0.1 | 0.5 Min | 0.01 | 0.02 | 0.6 |
PB-2 Standard : BS 1400 | PB 2 | Rem | 11-13 | 0.5 | 0.3 | 0.15 | 0.5 | 0.15 Min | 0.01 | 0.02 | 0.2 |
PB-4 Standard : BS 1400 | PB-4 | Rem | 9.5 Min | 0.75 | 0.5 | - | 0.5 | 0.4 Min | - | - | 0.5 |
Phosphorus Bronze IS : 28 - 1985 Grade - 1 Standard : IS : 28 - 1985 | Phosphorus Bz (Grade- 1) | Rem | 6 - 8 | 0.25 | 0.5 | 0.3 | 0.7 | 0.3 - 0.5 | 0.01 | 0.2 | 1.2 |
Phosphorus Bronze IS : 28 - 1985 Grade - 2 Standard : IS : 28 - 1985 | Phosphorus Bz (Grade - 2) | Rem | 10 Min | 0.25 | 0.5 | 0.1 | 0.1 | 0.5 Min | 0.01 | 0.02 | 0.6 |
Phosphorus Bronze IS : 28 - 1985 Grade - 3 Standard : IS : 28 - 1985 | Phosphorus Bz (Grade - 3) | Rem | 6.5 - 8.5 | 2 - 5 | 2 | - | 1 | 0.3 Min | - | - | 0.5 |
Phosphorus Bronze IS : 28 - 1985 Grade - 4 Standard : IS : 28 - 1985 | Phosphorus Bz (Grade - 4) | Rem | 9 - 11 | 0.25 | 0.05 | 0.05 | 0.25 | 0.15 | - | - | 0.8 |
Phosphorus Bronze IS : 28 - 1985 Grade - 5 Standard : IS : 28 - 1985 | Phosphorus Bz (Grade - 5) | Rem | 11 - 13.1 | 0.5 | 0.5 | 0.3 | 0.5 | 0.15 Min | - | - | 0.2 |
Copper Alloys | Tensile Strength (Min.) | Elongation % (Min.) | Brinell Hardness (Min.) |
Standard B S:1400, Grade - PB 1 | 220 Mpa. | 3% | 70 BHN. |
Standard B S:1400, Grade - PB 2 | 220 Mpa. | 5% | 90 BHN. |
Standard B S:1400, Grade - PB 3 | 230 Mpa. | 6% | 80 BHN. |
Standard IS: 28-1985, Grade - 1 | 190 Mpa. | 3% | 60 BHN. |
Standard IS: 28-1985, Grade - 2 | 220 Mpa. | 3% | 70 BHN. |
Standard IS: 28-1985, Grade - 3 | 190 Mpa. | 3% | 60 BHN. |
Standard IS: 28-1985, Grade - 4 | 230 Mpa. | 6% | 80 BHN. |
Standard IS: 28-1985, Grade - 5 | 220 Mpa. | 5% | 90 BHN. |