Phosphor Bronze
C51900 — Phosphor Bronze (6% Tin)
A phosphor bronze with a higher tin range than C51000, selected for greater strength and wear resistance in bushings, fasteners and spring parts.
Grade overview
C51900 sits between the common 5% (C51000) and 8% (C52100) phosphor bronzes. The additional tin gives higher strength and better resistance to wear and fatigue than C51000, while retaining reasonable cold-working behaviour in strip and sheet forms.
It is an option for engineers who find C51000 slightly too soft for a bearing or wear application but do not need the hardness or reduced formability of C52100. As with every grade on this site, suitability depends on the temper, product form and operating conditions.
Alloy family and identification
Wrought copper-tin-phosphorus alloy, UNS C51900, with a nominal tin content of about 6%. Confirm the governing specification and temper on the purchase order, since coverage differs between product forms.
| Item | Detail |
|---|---|
| UNS designation | C51900 |
| Common name | Phosphor Bronze (6% Tin) |
| Alloy family | Phosphor Bronze |
| Type | Wrought copper-tin-phosphorus alloy |
Typical composition
| Element | Nominal limit, wt % |
|---|---|
| Copper (Cu) | Remainder |
| Tin (Sn) | 5.0 – 7.0 |
| Phosphorus (P) | 0.03 – 0.35 |
| Zinc (Zn) | 0.30 max |
| Iron (Fe) | 0.10 max |
| Lead (Pb) | 0.05 max |
Reference data only – typical or nominal values from published specifications, not a guarantee of supplied material. Confirm against the current edition of the applicable specification, the product form and condition, and the material test certificate. Technical review by the company is required before publication or reliance.
Typical mechanical properties
Mechanical property values are intentionally not published here. They vary with specification, product form, size and temper or condition and will be added only once the governing specification and condition are confirmed. Request the applicable specification or test certificate with your inquiry.
Physical properties
Physical properties (density, thermal and electrical data) are not listed until verified against an authoritative datasheet. Contact us for current reference data.
Corrosion and wear considerations
Comparable to other phosphor bronzes: good in atmospheric and fresh-water service, and acceptable in many mildly corrosive process environments. Improved wear behaviour relative to C51000 because of the higher tin content. Not recommended in ammonia-bearing or strongly oxidising media.
Machinability and fabrication
Machinable with suitable tooling and parameters but not a free-cutting grade; the harder tempers machine more slowly. Soldering and brazing are practised. Welding should be reviewed case by case.
Common industrial applications
- Bushings and sleeves under moderate load
- Fasteners and washers
- Spring components and flexible parts
- Wear strips and guides
- General engineering turned parts
Examples only. Suitability must be confirmed for the actual operating environment.
Available product forms
Sizes, tolerances and stock are not published and must be confirmed with the company.
Relevant products
Standards and specifications
- Applicable ASTM / customer specification and product-form coverage to be confirmed before publication or ordering
Verify against the current edition and the exact product form before specifying.
Certification and inspection options
Material test certificates, chemical analysis, dimensional reports and third-party inspection can be requested with your inquiry. What can be supplied for C51900 is confirmed with the company for each order; no certificate is implied by this page.
Related grades
Frequently asked questions
When would I choose C51900 over C51000?
When the application needs more strength or wear resistance than the 5% tin grade provides and the part is not severely formed after hardening.
Is C51900 available as plate?
Plate and sheet are listed on this site; exact availability, thickness range and temper are confirmed with the company for each inquiry.
Need C51900 in a specific form?
Share your grade, dimensions, quantity and technical requirements with our team.