Description:

The main component of phosphorus Bronze is copper with tin added, and is an environmentally friendly alloy which does not contain harmful components deoxidized by phosphor.Phosphorus bronze alloys are primarily used for electrical products because they have superb spring qualities, high fatigue resistance, excellent formability, and high corrosion resistance. The addition of tin increases the corrosion resistance and strength of the alloy. The phosphorus increases the wear resistance and stiffness of the alloy.

Chemical Composition

PB-1
Standard: BS 1400

Copper Alloys CU SN PB ZN FE NI P AL SI Impurities
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

Copper Alloys Copper Alloys SN PB ZN FE NI P AL SI Impurities
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

Copper Alloys CU SN PB ZN NI P Impurities
PB 4 Rem. 9.5 Min 0.75 0.5 0.1 0.4 Min 0.5

Phosphorus Bronze IS:28-1985 Grade-1
Standard: IS: 28-1985

Copper Alloys CU SN PB ZN FE NI P AL SI SB Impurities
Phosphorus Bz (Grade-1) Rem. 6-8 0.25 0.5 0.3 0.7 0.3-0.5 0.01 0.02 0.1 1.2

Phosphorus Bronze IS:28-1985 Grade-2
Standard: IS: 28-1985

Copper Alloys CU SN PB ZN FE NI P AL SI Impurities
Phosphorus Bz (Grade-2) Rem. 10 Min 0.25 0.05 0.1 0.1 0.5 Min 0.01 0.02 0.6

Phosphorus Bronze IS:28-1985 Grade-3
Standard: IS: 28-1985

Copper Alloys CU SN PB ZN NI P Impurities
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

Copper Alloys CU SN PB ZN NI P Impurities
Phosphorus Bz (Grade-4) Rem. 9-11 0.25 0.05 0.25 0.15 0.8

Phosphorus Bronze IS:28-1985 Grade-5
Standard: 28-1985

Copper Alloys CU SN PB ZN FE NI P AL SI Impurities
Phosphorus Bz (Grade-5) Rem. 11 – 13.1 0.5 0.3 0.15 0.5 0.15 Min 0.01 0.02 0.2

Physical Properties

Phosphorus Bronze

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