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IS 318 Silicon Bronze Casting
IS 318 Silicon Bronze Casting | Indian Standard Silicon Bronze | SiB1, SiB2, SiB3 Grades
IS 318 Silicon Bronze castings, manufactured to the Bureau of Indian Standards (BIS) IS 318 specification for copper alloy ingots and castings, cover three silicon bronze grades: IS 318 Gr.SiB1 (equivalent to UNS C87300 / DIN CuSi1), IS 318 Gr.SiB2 (equivalent to UNS C87600 / CC211A / DIN CuSi3), and IS 318 Gr.SiB3 (equivalent to UNS C65500 / CW116C / DIN CuSi3Mn). Electrical Accessories India manufactures all IS 318 silicon bronze grades using sand casting, investment casting, centrifugal casting, green sand casting, and permanent mold casting.
As an Indian manufacturer, Electrical Accessories India is uniquely positioned to supply IS 318 silicon bronze castings with domestic Indian Standard compliance and full EN 10204 3.1 mill certificates for international export markets simultaneously, providing complete traceability for both Indian domestic procurement and international electrical, marine, and engineering applications.
IS 318 Silicon Bronze Grades: Composition and Properties
Chemical Composition – IS 318 Silicon Bronze Grades
| Element | SiB1 (C87300) Min–Max % | SiB2 (C87600) Min–Max % | SiB3 (C65500) Min–Max % |
|---|---|---|---|
| Cu | Balance | Balance | Balance |
| Si | 1.0–3.0 | 2.5–4.0 | 2.8–3.8 |
| Mn | — | — | 0.5–1.3 |
| Zn | — | 0.5 max | — |
| Fe | 0.8 max | 0.8 max | 0.8 max |
| Pb | 0.05 max | 0.05 max | 0.05 max |
| IS 318 Grade | US Equivalent | EN Equivalent | DIN Equivalent | Si % | Mn % | UTS (MPa) | Application |
|---|---|---|---|---|---|---|---|
| IS 318 Gr.SiB1 | C87300 / UNS C87300 | – | DIN CuSi1 | 1.5-3.0 | 0.5-1.3 | 380 min | Weldable marine, architectural, food-grade |
| IS 318 Gr.SiB2 | C87600 / UNS C87600 | CC211A (BS EN 1982) | DIN CuSi3 | 3.0-5.0 | 0.8-1.5 | 430 min | Marine, chemical plant, architectural |
| IS 318 Gr.SiB3 | C65500 / UNS C65500 | CW116C (BS EN 12163) | DIN CuSi3Mn | 2.8-3.8 | 0.5-1.3 | 490 min | Highest strength, cryogenic, chemical plant |
IS 318 Gr.SiB1 (C87300 Equivalent) Properties
| Property | IS 318 Gr.SiB1 |
|---|---|
| Silicon (Si) | 1.5-3.0% |
| Manganese (Mn) | 0.5-1.3% |
| Tensile Strength | 380 MPa min |
| Yield Strength (0.2%) | 140 MPa min |
| Elongation | 20% min |
| Hardness | 80-110 HB |
| Density | 8.3 g/cm3 |
| Weldability | Excellent |
IS 318 Gr.SiB2 (C87600 / CC211A Equivalent) Properties
| Property | IS 318 Gr.SiB2 |
|---|---|
| Silicon (Si) | 3.0-5.0% |
| Manganese (Mn) | 0.8-1.5% |
| Tensile Strength | 430 MPa min |
| Yield Strength (0.2%) | 170 MPa min |
| Elongation | 18% min |
| Hardness | 90-130 HB |
| Density | 8.3 g/cm3 |
| Weldability | Excellent |
IS 318 Gr.SiB3 (C65500 / CW116C Equivalent) Properties
| Property | IS 318 Gr.SiB3 |
|---|---|
| Silicon (Si) | 2.8-3.8% |
| Manganese (Mn) | 0.5-1.3% |
| Tensile Strength | 490 MPa min |
| Yield Strength (0.2%) | 200 MPa min |
| Elongation | 15% min |
| Hardness | 100-150 HB |
| Density | 8.5 g/cm3 |
| Max Temp | 200 deg C (cryogenic to -200 deg C) |
IS 318 Silicon Bronze Casting Processes
IS 318 Silicon Bronze Sand Casting
IS 318 Silicon Bronze Sand Casting (all grades: SiB1, SiB2, SiB3) uses furan resin-bonded sand moulds for versatile production. Components 0.05-200+ kg. Tolerances CT7-CT9. IS 318 compliance certificates with spectrometric analysis supplied. Lead times 1-2 weeks for repeat production.
IS 318 Silicon Bronze Centrifugal Casting
IS 318 Silicon Bronze Centrifugal Casting produces hollow cylindrical components in all three IS 318 grades. Centrifugal force produces dense, fine-grained castings with excellent mechanical properties. Tolerances CT5-CT6. IS 318 certification supplied.
IS 318 Silicon Bronze Investment Casting
IS 318 Silicon Bronze Investment Casting (lost-wax process) achieves CT4-CT5 tolerances and Ra 1.6-3.2 um surface finish in all IS 318 grades. Ideal for precision components, art castings, and architectural hardware requiring IS 318 compliance with precision tolerances.
IS 318 Silicon Bronze Green Sand Casting
IS 318 Silicon Bronze Green Sand Casting uses clay-bonded green sand for economical, rapid production of standard shapes. Tolerances CT8-CT10. Most economical for high-volume IS 318 hardware.
IS 318 Silicon Bronze Permanent Mold Casting
IS 318 Silicon Bronze Permanent Mold Casting uses reusable metal dies for high-volume, dimensionally consistent production. Tolerances CT5-CT7. IS 318 compliance with EN 10204 3.1 certificates for export markets.
IS 318 to International Standard Cross-Reference
| IS 318 Grade | USA (ASTM/UNS) | UK/EU (BS EN) | Germany (DIN) | ISO | Japan (JIS) |
|---|---|---|---|---|---|
| Gr.SiB1 | C87300 | – | CuSi1 | CuSi1 | – |
| Gr.SiB2 | C87600 | CC211A (EN 1982) | CuSi3 | CuSi3 | – |
| Gr.SiB3 | C65500 | CW116C (EN 12163) | CuSi3Mn | CuSi3Mn1 | C6561 |
Applications of IS 318 Silicon Bronze Castings
- Indian Electrical Industry: Earthing clamps, cable gland bodies, conduit fittings, bonding hardware to IS 318 for Indian electrical installations
- Indian Marine Industry: Marine hardware, fasteners, deck fittings to IS 318 specification for Indian shipbuilding
- Export Markets: IS 318 castings with EN 10204 3.1 certificates and international grade cross-references for export to USA, UK, Germany, Australia
- Architectural and Heritage: Indian heritage restoration, temple hardware, architectural bronzes to IS 318 specification
- Chemical and Process Industry: Earthing and structural hardware for Indian chemical and fertilizer plants
Quality Standards
- IS 318 – Indian Standard for Copper Alloy Ingots and Castings (BIS)
- ASTM B198 – Copper-Silicon Alloy Sand Castings (C87300, C87600 equivalents)
- ASTM B96 – Silicon Bronze Rod, Bar, and Shapes (C65500 equivalent)
- BS EN 1982 – CC211A (SiB2 equivalent)
- BS EN 12163 – CW116C (SiB3 equivalent)
- 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 for IS 318 Silicon Bronze Castings
Electrical Accessories India, as a leading Indian manufacturer of silicon bronze castings, supplies IS 318 Gr.SiB1, SiB2, and SiB3 silicon bronze castings with full BIS-compliant chemical analysis. Quotations within 24 hours. Specify grade (IS 318 Gr.SiB1/SiB2/SiB3 or international equivalent), quantity, casting process, and delivery. EN 10204 3.1 mill certificates supplied for both domestic Indian orders and export. Indicative pricing: USD 13.90 per kg CIF US Port.