What is C87800 Silicon Bronze / CC212A?

C87800 (UNS C87800) is a silicon brass with 3.5-4.5% silicon and 12-16% zinc, known internationally as CC212A (BS EN 1982) and DIN CuZn15Si4. It is technically a silicon brass rather than a true silicon bronze due to its significant zinc content. Offers 520 MPa tensile strength - the highest of the silicon bronze family - and good machinability (40-50%).

What is the difference between C87800 silicon bronze and true silicon bronze?

C87800 (CC212A) is technically a silicon brass: it contains 12-16% zinc alongside 3.5-4.5% silicon. True silicon bronzes (C87300, C87600) have little or no zinc. The zinc in C87800 increases strength (520 MPa vs 380-430 MPa) and machinability (40-50%) but slightly reduces corrosion resistance in aggressive environments compared to zinc-free silicon bronze.

What is the BS EN equivalent of C87800?

The BS EN 1982 equivalent of C87800 is CC212A. The DIN equivalent is CuZn15Si4. These are all silicon brass alloys with the same nominal composition of Cu-Si3.5-4.5-Zn12-16.

What casting processes are available for C87800?

C87800/CC212A is available as sand casting, centrifugal casting, investment casting, green sand casting, and permanent mold casting. Its higher zinc content gives improved fluidity and reduced shrinkage compared to true silicon bronze.

Product

Product Details

C87800 Silicon Bronze Casting

C87800 Silicon Bronze Casting | CC212A | DIN CuZn15Si4

C87800 Silicon Bronze casting (UNS C87800), internationally designated as CC212A (BS EN 1982) and DIN CuZn15Si4, is a high-silicon brass alloy. Electrical Accessories India manufactures C87800/CC212A castings using sand casting, investment casting, centrifugal casting, green sand casting, and permanent mold casting for marine, electrical, architectural, and general engineering applications worldwide.

C87800 (CC212A) is technically classified as a silicon brass rather than a pure silicon bronze due to its significant zinc content. This zinc addition provides the highest tensile strength (520 MPa) in the silicon bronze family, improved machinability (40-50%), and reduced material cost, while the silicon ensures good casting characteristics and corrosion resistance. It is widely used in European markets under the CC212A designation for marine hardware, plumbing fittings, and architectural hardware.

C87800 / CC212A Chemical Composition and Mechanical Properties

Property	C87800 / CC212A Value	Standard
UNS Number	C87800	ASTM/CDA USA
EN Designation	CC212A	BS EN 1982
DIN Equivalent	CuZn15Si4	DIN 1705 Germany
Silicon (Si)	3.5-4.5%	BS EN 1982
Zinc (Zn)	12-16%	BS EN 1982
Copper (Cu)	Remainder (approx 80%)	BS EN 1982
Tensile Strength	520 MPa min	BS EN 1982
0.2% Yield Strength	230 MPa min	BS EN 1982
Elongation	12% min	BS EN 1982
Hardness	120-160 HB	–
Density	8.2 g/cm3	–
Electrical Conductivity	6-8% IACS	–
Thermal Conductivity	33 W/m.K	–
Max Service Temperature	180 deg C	–
Machinability Rating	40-50%	vs free-cutting brass = 100%
Weldability	Good (TIG with ERCuSi-A)	AWS A5.7

C87800 Silicon Bronze Casting Processes

C87800 Silicon Bronze Sand Casting

C87800 Silicon Bronze Sand Casting (CC212A sand casting) uses furan resin-bonded sand moulds for large and complex components. C87800 has excellent casting fluidity due to its zinc content, filling thin sections and complex geometries effectively. Component weights from 0.05 to 200+ kg. Tolerances CT7-CT9, surface finish Ra 6.3-12.5 um. Lead times 1-2 weeks. The high zinc content of C87800 improves mould filling compared to lower-zinc C87300 and C87600.

Applications: Valve bodies, plumbing fittings, marine hardware, pump bodies, architectural hardware, conduit fittings.

C87800 Silicon Bronze Centrifugal Casting

C87800 Silicon Bronze Centrifugal Casting produces cylindrical components with sound, fine-grained microstructure. C87800 centrifugal castings benefit from the alloy’s high strength and good machinability, producing bearing bushings and cylindrical components that can be finish-machined to close tolerances. Tolerances CT5-CT6 on wall and length.

Applications: Bearing bushings, pipe flanges, cylindrical valve bodies, shaft sleeves, pump wear rings.

C87800 Silicon Bronze Investment Casting

C87800 Silicon Bronze Investment Casting (lost-wax process) achieves CT4-CT5 tolerances and Ra 1.6-3.2 um surface finish. C87800 (CC212A) fluidity in investment casting is excellent due to zinc addition, enabling thin walls and fine detail. Used for precision architectural hardware, plumbing fittings, marine hardware, and complex-geometry components requiring close tolerances and minimal machining.

Applications: Precision architectural hardware, precision marine fittings, plumbing valves and fittings, complex-geometry electrical connectors.

C87800 Silicon Bronze Green Sand Casting

C87800 Silicon Bronze Green Sand Casting provides fast, low-cost production for standard hardware shapes. Clay-bonded sand moulds are used for medium-weight components that will be CNC machined to final dimensions. Tolerances CT8-CT10. Most economical for large-volume standard C87800 hardware where tight as-cast tolerances are not required.

Applications: Standard hardware blanks, plumbing fitting blanks, architectural hardware blanks for machining.

C87800 Silicon Bronze Permanent Mold Casting

C87800 Silicon Bronze Permanent Mold Casting is particularly well-suited to C87800 due to the alloy’s high zinc content, which gives it one of the best die filling characteristics in the silicon bronze family. Steel dies preheated to 200-250 deg C. Tolerances CT5-CT7, excellent dimensional consistency across production runs. Ideal for medium-complexity fittings and hardware in quantities of 500-50,000 pieces.

Applications: Standard plumbing fittings, marine hardware in production volumes, electrical connector bodies, cable gland bodies, architectural hardware components.

International Equivalents of C87800 Silicon Bronze

Standard	Designation	Country/Region
UNS (ASTM/CDA)	C87800	USA
BS EN 1982	CC212A	UK / Europe
DIN 1705	CuZn15Si4	Germany
EN (Europe)	CC212A	Europe

Applications of C87800 / CC212A Silicon Bronze Castings

Marine Hardware: Deck hardware, cleats, fairleads, through-hull fittings, plumbing fittings. C87800/CC212A is widely specified in European marine hardware under the CC212A designation.
Plumbing and Valves: Valve bodies, gate valves, ball valve bodies, plumbing fittings. Silicon ensures dezincification resistance; suitable for non-potable water service.
Electrical Hardware: Cable gland bodies, earthing hardware, conduit fittings in environments where maximum strength is required.
Architectural Hardware: Door handles, window fittings, decorative hardware. C87800 offers highest strength in the silicon bronze family for structural architectural hardware.
General Engineering: Pump components, hydraulic fittings, valve bodies, structural hardware requiring superior strength vs cost.

Quality Standards for C87800 / CC212A

BS EN 1982 – Copper and Copper Alloys Ingots and Castings (CC212A)
ASTM B198 – Copper-Silicon Alloy Sand Castings
DIN 1705 – Copper-Silicon-Zinc Casting Alloys (CuZn15Si4)
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 C87800 / CC212A Silicon Bronze Castings

Contact Electrical Accessories India for C87800 and CC212A silicon bronze castings. Quotations within 24 hours. Provide drawing (PDF/DXF/STEP), grade required (C87800/CC212A/DIN CuZn15Si4), 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.