C87300 Silicon Bronze Casting

C87300 Silicon Bronze Casting

C87300 Silicon Bronze casting (UNS C87300), classified as Low Silicon Bronze A per the UNS system and IS 318 Gr.SiB1 under Indian Standards, is a copper-base foundry alloy. Electrical Accessories India manufactures C87300 silicon bronze castings using sand casting, investment casting, centrifugal casting, green sand casting, and permanent mold casting processes for marine, electrical, architectural, and industrial applications worldwide.

C87300 is distinguished by its exceptional weldability, the highest of any copper casting alloy, combined with superior corrosion resistance in seawater, freshwater, dilute mineral acids, and ammonia-rich industrial atmospheres. With a minimum tensile strength of 380 MPa, 20% elongation, and a density of 8.3 g/cm3, C87300 balances strength, ductility, and corrosion performance for demanding engineering applications.

C87300 Silicon Bronze Chemical Composition and Properties

C87300 Silicon Bronze Casting Processes

C87300 Silicon Bronze Sand Casting

C87300 Silicon Bronze Sand Casting is the most versatile process for low-to-medium volume production of large or complex-geometry components. Furan resin-bonded sand moulds are used, with C87300 melt poured at 1050-1100 deg C. Sand casting supports component weights from 0.05 kg to over 200 kg, making it ideal for valve bodies, large marine hardware, pump housings, architectural elements, and earthing system hardware. Dimensional tolerances CT7-CT9, surface finish Ra 6.3-12.5 um. Lead times 1-2 weeks from existing patterns.

Typical Applications: Valve bodies, large marine hardware, earthing clamps, architectural castings, pump casings, conduit fitting bodies for chemical plant.

C87300 Silicon Bronze Centrifugal Casting

C87300 Silicon Bronze Centrifugal Casting produces hollow cylindrical components with exceptional microstructural soundness. Molten C87300 is introduced into a rapidly rotating metal mould at 60-80g, expelling gas, slag, and inclusions to the bore. Results in fully dense, fine-grained castings with directional solidification. Tolerances CT5-CT6, bore finish Ra 3.2-6.3 um before machining. Ideal for bearing bushings, pipe flanges, valve seats, and cylindrical connector bodies.

Typical Applications: Marine shaft bushings, seawater-service pipe flanges, bronze valve seat rings, cylindrical chemical plant fittings, earthing rod connector bodies.

C87300 Silicon Bronze Investment Casting

C87300 Silicon Bronze Investment Casting (lost-wax casting) is the process of choice for precision marine hardware, fine art sculpture, and architectural hardware with complex undercuts. Ceramic shell mould (8-12 dip layers) is filled with C87300 at 1060-1100 deg C. Achieves CT4-CT5 tolerances (plus or minus 0.15 mm on critical dimensions) and Ra 1.6-3.2 um surface finish. C87300 low silicon content produces fine-grained microstructure capturing textures as fine as 0.1 mm, ideal for artistic bronzes and precision marine hardware.

Typical Applications: Sculpture and art castings, architectural hardware, precision marine hardware (cleats, fairleads), food-grade fittings, heritage restoration pieces.

C87300 Silicon Bronze Green Sand Casting

C87300 Silicon Bronze Green Sand Casting uses clay-bonded green sand moulds for fastest turnaround and lowest tooling cost. Suitable for medium-weight components where tight tolerances are not critical, and for high-volume production of standard hardware shapes that will be CNC machined. Tolerances CT8-CT10, surface finish Ra 12.5-25 um. Most cost-effective for large-volume standard hardware in C87300.

Typical Applications: High-volume hardware blanks, clamp bodies, flange blanks, connector bodies for subsequent machining, standard earthing hardware shapes.

C87300 Silicon Bronze Permanent Mold Casting

C87300 Silicon Bronze Permanent Mold Casting (gravity die casting) uses reusable steel or cast iron dies preheated to 200-250 deg C. The rapid chilling effect produces finer grain structure and higher mechanical properties than sand casting, with excellent dimensional repeatability (CT5-CT7). Ideal for medium-complexity components in quantities of 500-50,000 pieces. Die life typically 10,000-50,000 shots for C87300.

Typical Applications: Fastener blanks, standard marine fittings, electrical connector bodies, cable gland bodies, conduit fittings in production volumes.

International Equivalents of C87300 Silicon Bronze

Applications of C87300 Silicon Bronze Castings

• Marine Engineering: Deck hardware, cleats, fairleads, through-hull fittings, propeller shaft components, marine fasteners
• Electrical and Chemical Plant: Earthing clamps in ammonia and H2S environments, cable gland bodies, conduit fittings
• Architectural Hardware: Door handles, window furniture, handrail brackets, memorial plaques with natural golden-brown patina
• Fine Art and Sculpture: Investment-cast sculpture, bas-reliefs, architectural ornaments with finest surface detail
• Cryogenic Service: Valve bodies for LNG and liquid nitrogen service (-200 to +200 deg C)
• Food and Beverage: Lead-free fittings for food processing where zinc leaching from brass is unacceptable

Quality Standards

• ASTM B198 – Copper-Silicon Alloy Sand Castings
• IS 318 – Indian Standard for Copper Alloy Ingots and Castings
• DIN 1705 – Copper-Silicon Casting Alloys
• AWS A5.7 ERCuSi-A – Silicon Bronze Welding Wire
• ISO 9001:2015 Quality Management System
• EN 10204 3.1 Mill Certificates
• RoHS 3 and REACH compliant

Request a Quote

Contact Electrical Accessories India for C87300 Silicon Bronze castings. Provide your drawing (PDF/DXF/STEP), quantity, casting process, and delivery requirements. Quotations within 24 hours. Export to USA, UK, Germany, Australia, UAE, Singapore with full EN 10204 3.1 mill certificates. Indicative pricing: USD 13.90 per kg CIF US Port.