Valve and Steam Bronze
C92200 — Steam / Valve Bronze (Navy “M” Bronze)
A leaded tin-zinc bronze developed for steam and valve castings that need pressure tightness and reliable service in hot water and steam.
Grade overview
C92200 – often called steam bronze, valve bronze or Navy “M” bronze – has been a standard material for pressure-retaining castings in steam, hot water and general fluid service. A tin-bronze base with controlled lead and zinc additions gives sound, pressure-tight castings with good machinability.
It is a widely used valve and fitting material, particularly for steam and water duty. Because it contains lead, it is not intended for potable-water contact where lead content is restricted.
Alloy family and identification
Cast copper-tin-lead-zinc alloy, UNS C92200, commonly “steam bronze” or “valve bronze”, usually specified under ASTM B61.
| Item | Detail |
|---|---|
| UNS designation | C92200 |
| Common name | Steam / Valve Bronze (Navy “M” Bronze) |
| Alloy family | Valve and Steam Bronze |
| Type | Cast copper-tin-lead-zinc alloy |
Typical composition
| Element | Nominal limit, wt % |
|---|---|
| Copper (Cu) | 86.0 – 90.0 |
| Tin (Sn) | 5.5 – 6.5 |
| Lead (Pb) | 1.0 – 2.0 |
| Zinc (Zn) | 3.0 – 5.0 |
| Nickel (Ni, incl. Co) | 1.0 max |
| Iron (Fe) | 0.25 max |
| Antimony (Sb) | 0.25 max |
| Phosphorus (P) | 0.05 max |
| Sulfur (S) | 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
Good resistance to steam, hot water and many general-service fluids; not suitable for ammonia-bearing or strongly oxidising media. Temperature and pressure limits depend on the design and applicable code, not on the alloy alone.
Machinability and fabrication
Good machinability. Can be soldered or brazed in typical fitting designs. Weld repairs should follow a qualified procedure.
Common industrial applications
- Steam valves and valve bodies
- Pipe fittings and unions for steam / hot water
- Pump and boiler fittings
- Marine auxiliary systems (compatible service)
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
- ASTM B61 – steam or valve bronze castings
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 C92200 is confirmed with the company for each order; no certificate is implied by this page.
Related grades
Frequently asked questions
Is C92200 the same as C83600?
No. C92200 is a higher-tin steam / valve bronze (about 6% tin); C83600 is the 85-5-5-5 pipe-fitting alloy with more lead and zinc.
What pressure can a C92200 fitting hold?
Rating depends on the fitting design, size, temperature and governing standard. No rating is stated on this website; confirm with the company.
Need C92200 in a specific form?
Share your grade, dimensions, quantity and technical requirements with our team.