C65500 Silicon Bronze Casting

C65500 Silicon Bronze Casting | High Silicon Bronze A | CW116C | CuSi3Mn1

C65500 High Silicon Bronze A casting (UNS C65500), designated CW116C in the European standard BS EN 12163, CuSi3Mn1 in ISO, CuSi3Mn in DIN, IS 318 Gr.SiB3 in India, and JIS C6561 in Japan, is a premium silicon bronze with 2.8-3.8% silicon and 0.5-1.3% manganese. Electrical Accessories India manufactures C65500/CW116C silicon bronze castings using sand casting, investment casting, centrifugal casting, green sand casting, and permanent mold casting for marine, cryogenic, chemical plant, and precision engineering applications worldwide.

C65500 High Silicon Bronze A delivers 490 MPa minimum tensile strength – the highest mechanical performance in the silicon bronze family for non-brass alloys – combined with excellent weldability, superior stress corrosion cracking resistance, and the widest operating temperature range (-200 to +200 deg C) of any copper casting alloy. The manganese addition (0.5-1.3%) provides grain refinement, improved strength, and enhanced dezincification resistance.

C65500 / CW116C Chemical Composition and Mechanical Properties

C65500 Silicon Bronze Casting Processes

C65500 Silicon Bronze Sand Casting

C65500 High Silicon Bronze A Sand Casting uses furan resin-bonded sand moulds for large and complex components. C65500’s manganese addition improves grain refinement in sand castings, producing finer microstructure and higher mechanical properties than C87300 or C87600 at similar sand casting conditions. Component weights 0.05-200+ kg. Tolerances CT7-CT9. Surface finish Ra 6.3-12.5 um. Lead times 1-2 weeks from existing patterns. Suitable for cryogenic valve bodies, large chemical plant hardware, and structural earthing components where maximum strength is required.

Applications: Cryogenic valve bodies (LNG, liquid oxygen), chemical plant structural hardware, large earthing components, pump bodies for aggressive chemical service.

C65500 Silicon Bronze Centrifugal Casting

C65500 High Silicon Bronze A Centrifugal Casting produces dense, fine-grained hollow cylindrical components with the highest mechanical properties in the silicon bronze family. Centrifugal force (60-80g) combined with C65500’s manganese-refined grain structure produces centrifugal castings with mechanical properties approaching those of wrought C65500. Tolerances CT5-CT6. Ideal for high-pressure valve seats, high-load bearing bushings, and precision cylindrical components for chemical and cryogenic service.

Applications: High-pressure valve seat rings, heavy-duty bearing bushings, cryogenic pump shaft sleeves, chemical plant cylindrical components.

C65500 Silicon Bronze Investment Casting

C65500 High Silicon Bronze A Investment Casting achieves CT4-CT5 tolerances and Ra 1.6-3.2 um surface finish. C65500’s higher silicon and manganese contents produce a denser, higher-strength investment casting than C87300 or C65100, with superior corrosion resistance. Ideal for precision cryogenic fittings, precision chemical plant hardware, complex-geometry earthing components, and marine hardware requiring maximum strength combined with investment casting surface quality.

Applications: Precision cryogenic valve fittings, complex-geometry chemical plant components, precision marine hardware, high-strength architectural hardware.

C65500 Silicon Bronze Green Sand Casting

C65500 High Silicon Bronze A Green Sand Casting uses clay-bonded green sand moulds for rapid, economical production of standard hardware shapes. Tolerances CT8-CT10. Most economical option for high-volume standard C65500 hardware where subsequent CNC machining will bring components to final tolerances. C65500 machinability (30%) is slightly lower than C87300 but still significantly better than tin bronze or aluminum bronze.

Applications: High-volume hardware blanks, structural clamping hardware blanks, fitting blanks for CNC machining.

C65500 Silicon Bronze Permanent Mold Casting

C65500 High Silicon Bronze A Permanent Mold Casting uses reusable steel dies at 200-250 deg C for high-volume production with excellent dimensional consistency (CT5-CT7). C65500 permanent mold castings benefit from the alloy’s manganese-refined grain structure under the rapid die-cooling conditions, producing excellent mechanical properties in production hardware. Ideal for 500-50,000 piece production runs of standard high-strength fittings and hardware.

Applications: High-strength fastener blanks, structural fittings, earthing clamp bodies, cable gland bodies for aggressive environments.

International Equivalents of C65500 Silicon Bronze

Applications of C65500 High Silicon Bronze A Castings

• Cryogenic Engineering: C65500 maintains full ductility at -200 deg C, making it the preferred silicon bronze for valve bodies, fittings, and structural components in liquid nitrogen, liquid oxygen, and LNG service.
• Chemical Plant: Structural hardware for ammonia, acid, and H2S environments. C65500 stress corrosion cracking resistance exceeds all standard brasses and most copper alloys in nitrogen-compound atmospheres.
• Marine and Offshore: High-strength deck hardware, structural fasteners, sub-sea hardware. C65500 provides the highest strength silicon bronze option for demanding structural marine applications.
• Electrical Earthing: Earthing clamps and connectors requiring maximum mechanical strength in corrosive industrial environments where C87300 or C87600 strength is insufficient.
• Precision Engineering: Bearing bushings, valve seats, pump components where maximum silicon bronze strength is needed combined with investment casting precision.

Quality Standards for C65500 / CW116C Silicon Bronze

• ASTM B96 – Silicon Bronze Rod, Bar, and Shapes
• BS EN 12163 – Copper Alloy Rod and Bar (CW116C)
• IS 318 – Indian Standard for Copper Alloy Ingots and Castings (Gr.SiB3)
• DIN 1705 – Copper-Silicon-Manganese Casting Alloys (CuSi3Mn)
• JIS H5120 – Copper and Copper Alloy Castings (C6561)
• AWS A5.7 ERCuSi-A – Silicon Bronze Welding Wire
• ISO 9001:2015 Quality Management System
• EN 10204 3.1 Mill Certificates (spectrometric analysis)
• RoHS 3 and REACH compliant

Request a Quote for C65500 / CW116C High Silicon Bronze A Castings

Electrical Accessories India supplies C65500 and CW116C High Silicon Bronze A castings for cryogenic, chemical plant, marine, and precision engineering applications. Quotations within 24 hours. Provide your drawing (PDF/DXF/STEP), required grade (C65500/CW116C/CuSi3Mn1/IS 318 Gr.SiB3), quantity, casting process, and delivery destination. Export worldwide with EN 10204 3.1 mill certificates. Indicative pricing: USD 13.90 per kg CIF US Port.