C51900 Phosphor Bronze Strip (CuSn6 / QSn6.5-0.1)
C51900 is a phosphor bronze (CuSnP) strip with about 6.5% tin, offering high corrosion resistance, fatigue resistance, anti-magnetic performance, easy brazing and good workability. It is widely used for elastic components and wear-resistant, anti-magnetic parts of precision instruments, and is available tin-plated (1–6 μm).
Key Features & Advantages
-
High elasticity & fatigue resistance for reliable springs.
-
Anti-magnetic and corrosion resistant.
- Easy brazing and good cold workability.
- Can be made into fine-grain phosphor-bronze strip.
- Optional tin coating 1–6 μm for solderability.
Typical Applications
- Springs and elastic contact components
- Wear-resistant, anti-magnetic precision-instrument parts
- Connectors and switch elements
- Electronic elastic elements
Equivalent Grades
| GB |
ASTM |
JIS |
EN |
| QSn6.5-0.1 |
C51900 |
C5191 |
CuSn6 |
Chemical Composition (%)
| Cu |
Sn |
P |
Zn |
Fe |
Pb |
| Balance |
5.0–7.0 |
0.03–0.35 |
≤0.30 |
≤0.10 |
≤0.05 |
*Composition shown per ASTM C51900; GB QSn6.5-0.1 Sn range 6.0–7.0.
Physical Properties
| Density (g/cm³) |
Modulus (GPa) |
Thermal Exp. (×10⁻⁶/K) |
Conductivity (%IACS) |
Thermal Cond. (W/m·K) |
| 8.86 |
118 |
17.2 |
13 |
75 |
Mechanical Properties (by Temper)
| Temper |
Tensile Rm (MPa) |
Elong. % (A11.3) |
Hardness HV |
| O60 (Soft) |
330–435 |
≥45 |
— |
| H01 (1/4H) |
420–520 |
≥17 |
110–155 |
| H02 (1/2H) |
440–545 |
≥8 |
150–190 |
| H04 (H) |
550–680 |
≥5 |
180–230 |
| H06 (EH) |
640–730 |
≥3 |
200–240 |
| H08 (SH) |
≥720 |
— |
≥210 |
*Tensile values shown per EN/ASTM range; consult us for exact standard.
Available Sizes & Surface
Custom thickness & width · Bare or tin-plated 1–6 μm · Fine-grain strip available.
Need spring-grade C51900 (CuSn6) phosphor bronze strip?Bare or tin-plated — samples and full datasheet on request.
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FAQ
Q: What is C51900 phosphor bronze used for?
Springs, elastic contacts and wear-resistant, anti-magnetic precision-instrument parts, plus connectors and switch elements.
Q: Is C51900 the same as CuSn6?
Yes. C51900 (ASTM) = QSn6.5-0.1 (GB) = C5191 (JIS) = CuSn6 (EN), a ~6.5% tin phosphor bronze.
Q: Can C51900 be supplied tin-plated?
Yes, with hot-dip / electroplated tin layers of 1–6 μm.
EN
