Phosphor Bronze is a premier copper alloy containing tin and phosphorus, renowned for superior spring resilience, high fatigue endurance, excellent wear resistance, and reliable corrosion protection. U.C. Metal supplies high-precision phosphor bronze strip coils and sheets for critical electrical contacts, relays, automotive switches, and precision stamped spring components.
Primary PB Grades
JIS C5191 (5% Sn), JIS C5210 (8% Sn High Spring Grade), JIS C5102 (4% Sn)
Available Tempers
Annealed, 1/4H, 1/2H, H, EH, SH depending on forming complexity and spring tension requirements
Available Dimensions
Strip: 0.01 mm – 3.0 mm (Width: 4 mm – 1220 mm) · Sheet: 0.2 mm – 3.0 mm (up to 1220 × 3500 mm)
Chemical Composition
Chemical composition limits according to verified company technical specifications (values in weight %):
| Element | C5191 | C5210 | C5102 |
|---|---|---|---|
| Copper (Cu) | Remaining | Remaining | Remaining |
| Phosphorus (P) | 0.11 ~ 0.13 % | 0.15 ~ 0.17 % | 0.09 ~ 0.11 % |
| Tin (Sn) | 5.5 ~ 7.0 % | 7.0 ~ 9.0 % | 4.5 ~ 5.5 % |
* Lead (Pb) ≤ 0.02%, Iron (Fe) ≤ 0.10%, Zinc (Zn) ≤ 0.20% as standard impurity limits.
Mechanical Properties & Hardness (Temper) Guide
Hardness ranges across standard temper conditions:
| Temper Designation | C5191 | C5210 | C5102 |
|---|---|---|---|
| Annealed (O) | 90 ~ 110 | — | — |
| 1/4H | 110 ~ 140 | — | 90 ~ 130 |
| 1/2H | 140 ~ 170 | 170 ~ 190 | 130 ~ 170 |
| H (Hard) | 170 ~ 200 | 190 ~ 210 | 170 ~ 190 |
| EH (Extra Hard) | ≥ 200 | 210 ~ 230 | ≥ 190 |
| SH (Spring Hard) | — | 230 ~ 250 | — |
* Vickers Hardness (HV) from verified technical records. C5210 is formulated for high-fatigue spring components requiring 1/2H, H, EH, or SH temper conditions.
International Standards Reference
JIS is the primary organizing standard for our phosphor bronze materials (JIS C5191, C5210, C5102). Comparable international standard designations (such as ASTM/UNS, ISO, or GB equivalents) can be confirmed upon enquiry.
Supply Dimensions & Available Formats
- Strip / Slit Coil: Thickness: 0.01 mm – 3.0 mm · Width: 4 mm – 1220 mm · Coil ID: 200 mm, 300 mm, 400 mm, 500 mm.
- Sheet / Plate: Thickness: 0.2 mm – 3.0 mm · Width: up to 1220 mm · Length: up to 3500 mm.
- Custom Processing: In-house coil slitting and cut-to-length shearing available according to customer specifications.