Description:

The main function of leaded bronze group of alloys is to improve machinability. They are known for their resistance towards corrosion and abrasion and their long service life. Common applications include connectors for wire and cable, electrical plug type connectors, door knobs, screws and nuts, bushings for corrosion, rolling mill bearings, and many more.The lead content in these alloys is between 7 percent and 30 percent. High-leaded tin bronzes are free cutting and retain favorable thermal conductivity and good lubricity due to the lead content. These alloys perform excellent in unforgiving environments where foreign matter may be present, such as dirt and other foreign materials.

Chemical Composition

LB-1
Standard: BS 1400

Copper Alloys CU SN PB ZN NI P SI Impurities
LB-1 Rem. 8-10 13-17 1 2 0.1 0.02 0.3

LB-2
Standard: BS 1400

Copper Alloys CU SN PB ZN FE NI P AL SI SB Impurities
LB-2 Rem. 9-11 8.5-11 1 0.15 2 0.1 0.01 0.02 0.5 0.5

LB-4
Standard: BS 1400

Copper Alloys CU SN PB ZN NI P SI SB Impurities
LB-4 Rem. 4-6 8-10 2 2 0.1 0.02 0.5 0.5

LB-5
Standard: JIS

Copper Alloys CU SN PB ZN NI P SI SB Impurities
LB-5 Rem. 4-6 18-23 1 2 0.1 0.01 0.5 0.3

LTB-3
Standard: IS 318-1981

Copper Alloys CU SN PB ZN FE NI AL SI SB Impurities
LB-4 Rem. 6-8 9-11 0.75 0.35 2 0.01 0.02 0.5 0.8

LTB-4
Standard: IS 318-1981

Copper Alloys CU SN PB ZN FE NI AL SI SB Impurities
LB-5 Rem. 6-8 14-16 0.75 0.35 2 – 0.02 0.5 0.8

LTB-5
Standard: IS 318-1981

Copper Alloys CU SN PB ZN FE NI AL SI SB Impurities
LTB-5 Rem. 9-11 8.5-11 1 0.35 2 0.01 0.02 0.5 0.8

LTB-6
Standard: IS 318-1981

Copper Alloys CU SN PB ZN FE NI AL SI SB Impurities
LB-5 Rem. 4-6 18-23 1 0.35 2 – 0.01 0.5 0.8

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
LPB-1 76/9/0/15 – – – –
LB2 80/10/0/10 80 180 8 60
LB3/LBC3 85/10/0/5 100 195 10 65
LB4 85/5/0/10 60 160 7 55
LB5 75/5/0/20 70 150 5 45
LBC3 79/10/1/10 80 180 8 60
LBC4 78/7/0/15 80 170 8 60