C90300 Tin Bronze, historically known as Navy G Bronze, is a high-strength copper-tin-zinc alloy prized for its exceptional corrosion resistance in seawater and high mechanical strength. Unlike leaded bearing bronzes, C90300 is engineered for structural integrity under pressure, making it the industry standard for naval valves, pump components, and heavy-duty marine fittings.
At Standard Metals, Inc., we provide C90300 strictly in the Type III Continuous Cast condition. This process results in a significantly denser grain structure than sand casting, providing the reliability needed for critical fluid-handling systems.
Primary Compliance & Specifications
Our inventory is managed to satisfy the most stringent naval and federal requirements:
- ASTM B505: The standard specification for Copper-Base Alloy Continuous Castings.
- QQ-C-390: Federal specification for high-performance tin-bronze castings.
- Type III (TY.III): We exclusively stock Continuous Cast material to ensure superior density and internal soundness.
- Navy G: The military-grade designation for this specific tin-bronze chemistry.
- DFARS Compliant: Sourced from the USA or DFARS-approved countries.
Advantages of Type III Continuous Cast Navy G
By supplying exclusively TY.III Continuous Cast C90300, we offer several advantages over traditional casting methods:
- Pressure Tightness: The dense, uniform grain structure is ideal for valve bodies and pump housings that must remain leak-proof under pressure.
- Superior Strength: The continuous cooling process optimizes the alloy’s mechanical properties, providing better tensile and yield strength than sand-cast alternatives.
- Reduced Finishing Time: The consistent structure allows for precision machining with predictable surface finishes, essential for high-tolerance naval components.
Engineering Advantages of C90300
- Seawater Corrosion Resistance: Outstanding performance in stagnant and high-velocity marine environments.
- Good Weldability: Unlike leaded bronzes, Navy G is generally considered weldable, allowing for complex assembly and repairs.
- High Impact Resistance: Capable of withstanding physical shock and vibration in naval applications.
- Wear Resistance: Offers excellent durability in saltwater-lubricated bearing applications.
Critical Marine & Naval Applications
- Pressure Components: Main seawater valves, pump casings, and condenser parts.
- Structural Hardware: Marine fasteners, spacers, and heavy-duty ship fittings.
- Bearings & Bushings: Specifically for applications requiring high strength and corrosion resistance rather than high lubricity.
- Expansion Joints: Critical components for piping systems subject to thermal movement.
The Standard Metals Advantage
Since 1978, Standard Metals, Inc. has been a primary resource for the Military and Naval markets.
- Precision Processing: We utilize our Horizontal Bandsaw to provide exact-length blanks, ready for your final machining stages.
- Quality Assurance: We manage the complex Specifications and documentation required for defense procurement.
- Comprehensive Certification: Every shipment includes full Mill Test Reports (MTRs) to verify chemical and mechanical compliance to ASTM B505 and QQ-C-390.
Looking for Type III Continuous Cast C90300 Tin Bronze (Navy G)? Request a Quote Today or call our alloy experts at 1-800-243-2224.