Leaded Gunmetal C83300

Alternative Material Options

For applications requiring higher tin content and improved strength, Leaded Bronze C83600 offers enhanced mechanical properties. When superior machinability is the primary requirement, Leaded Free-Cutting Brass C48500 provides exceptional cutting performance. For applications demanding higher strength and wear resistance without lead content, Aluminum Bronze C95400 serves as a premium alternative. In cost-sensitive applications where some corrosion resistance is still required, Semi-Red Brass C84400 offers an economical solution. For marine applications requiring maximum corrosion resistance, Silicon Bronze C87300 provides superior performance in seawater environments. When lead-free compliance is mandatory, Tin Bronze C90500 offers similar corrosion resistance without lead content.

International Equivalent / Comparable Grade

Design Purpose

Leaded Gunmetal C83300 was specifically engineered to provide the optimal balance between corrosion resistance, castability, and pressure tightness for critical applications in corrosive environments. The alloy's formulation addresses the need for a material that maintains the excellent corrosion resistance of high-copper bronzes while incorporating sufficient lead content to ensure pressure tightness and adequate machinability. With its higher copper content compared to other gunmetals, C83300 offers superior resistance to dezincification and corrosion in both freshwater and seawater environments. The carefully balanced lead content ensures micro-porosity filling during solidification, guaranteeing leak-proof performance in pressure-containing applications while maintaining enough ductility and strength for demanding service conditions. This sophisticated design makes C83300 particularly well-suited for marine hardware, pump components, and valves where failure due to corrosion or leakage is not an option.

Chemical Composition

Physical Properties

Mechanical Properties

Key Material Characteristics

• Superior corrosion resistance in both freshwater and seawater environments

• Excellent pressure tightness for valves, pumps, and pressure-containing components

• Good machinability with 80% rating compared to free-cutting brass

• Outstanding castability with excellent fluidity and minimal shrinkage defects

• High resistance to dezincification and stress corrosion cracking

• Good bearing properties and wear resistance for moving components

• Excellent surface finish capabilities for both functional and decorative parts

• Reliable performance across wide temperature ranges and service conditions

• Good weldability and repair capabilities when properly executed

• Historically proven reliability in marine and industrial applications

Manufacturability And Post Process

• Copper Die Casting: Excellent fluidity enables production of complex, high-integrity castings

• Sand Casting and Centrifugal Casting: Ideal for larger components and pressure vessels

• Post Machining: Good machinability enables precision finishing of critical features and sealing surfaces

• Drilling and Tapping: Produces clean, precise threads with good chip formation characteristics

• Tumbling: Effective for deburring and achieving uniform surface finish on cast components

• Sand Blasting: Creates consistent surface textures for improved coating adhesion or aesthetic purposes

• Grinding and Polishing: Achieves high-quality surface finishes for sealing surfaces and decorative elements

Suitable Surface Treatment

• Clear Lacquering: Preserves natural bronze appearance while providing oxidation protection

• Electroless Nickel Plating: Offers uniform corrosion protection and enhanced surface hardness

• Chemical Patina: Creates antique or statuary finishes for architectural applications

• Passivation Treatments: Enhance tarnish resistance while maintaining metallic appearance

• Electropolishing: Creates micro-smooth surfaces that improve corrosion resistance

• Oxide Sealing: Chemical treatments that stabilize the surface and enhance durability

Common Industries and Applications

• Marine hardware: seawater valves, pump components, and underwater fittings

• Plumbing systems: high-pressure valve bodies, fittings, and water distribution components

• Industrial equipment: chemical process valves, pump casings, and compressor parts

• Power generation: condenser components, heat exchanger parts, and turbine fittings

• Architectural applications: marine-grade hardware, decorative fixtures, and coastal building components

• General engineering: bearings, bushings, and mechanical components for corrosive environments

• Chemical processing: equipment components exposed to corrosive media and high pressures

When to Choose This Material

• Marine and seawater applications: Superior resistance to saltwater corrosion and dezincification

• High-pressure fluid systems: Excellent pressure tightness ensures leak-proof performance

• Corrosive environment applications: Proven resistance to various chemical and atmospheric corrosion

• Components requiring good machinability: Balanced lead content enables efficient machining operations

• Complex geometry castings: Excellent fluidity allows production of intricate shapes and thin walls

• Architectural applications in coastal areas: Combines aesthetic appeal with marine-grade corrosion resistance

• Historical restoration projects: Traditional gunmetal composition for authentic restoration work