C69400 – Silicon Red Brass
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C69400 – Silicon Red Brass Brochure
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Descriptions
C69400 Silicon Red Brass is a high-strength copper–zinc–silicon alloy engineered for excellent corrosion resistance, superior mechanical performance, and good machinability. The addition of silicon significantly improves strength, hardness, and wear resistance without compromising formability, making this alloy a preferred choice for high-load, high-pressure environments.
With its combination of strength and corrosion resistance, C69400 performs exceptionally well in marine, automotive, plumbing, and heavy industrial equipment. Its ability to withstand saltwater, chemical exposure, and mechanical stress ensures long service life and reliability in demanding applications.
In addition to its functional benefits, Silicon Red Brass offers a warm reddish-gold finish, making it suitable for architectural and decorative hardware where both aesthetics and durability are required.
Chemical Composition
C69400 Silicon Red Brass is a high-strength copper–zinc alloy enhanced with silicon to improve mechanical properties, corrosion resistance, and wear performance. The alloy maintains excellent integrity and machinability while offering long-term resistance to marine and industrial environments.
| Element | Composition (wt%) | Remarks |
|---|---|---|
| Copper (Cu) | 80.0 – 83.0 | Provides base strength and corrosion resistance |
| Zinc (Zn) | Balance (≈ 14.5) | Improves strength and hardness |
| Silicon (Si) | 3.5 – 4.5 | Enhances wear resistance and tensile strength |
| Lead (Pb) | ≤ 0.3 | Improves machinability and chip formation |
| Iron (Fe) | ≤ 0.2 | Improves mechanical strength and toughness |
| Other Elements (each) | ≤ 0.5 | Controlled trace elements for consistency |
| Total (Cu + Named Elements) | ≥ 99.5 | Ensures purity and mechanical reliability |
Note: The above composition ranges may vary slightly based on product form and manufacturer specifications. The addition of silicon provides exceptional corrosion resistance, high tensile strength, and reduced wear compared to conventional red brasses.
Mechanical, Physical & Fabrication Properties
C69400 Silicon Red Brass features an α + β duplex microstructure, which provides an excellent balance between strength, ductility, and corrosion resistance. The addition of silicon enhances wear resistance and mechanical strength while maintaining good machinability and thermal stability.
| Category | Property | Typical Value | Remarks |
|---|---|---|---|
| Mechanical | Microstructure | α + β (duplex) | Silicon improves strength and corrosion resistance |
| Tensile Strength | 565 – 896 MPa | High strength for heavy-duty applications | |
| Yield Strength | 276 – 393 MPa | Excellent load-bearing performance | |
| Elongation | Up to 25% | Good ductility for forming and machining | |
| Machinability | ≈ 30% (relative to C36000) | Moderate machinability with excellent chip control | |
| Thermal | Thermal Conductivity | 26 W/m·K | Moderate thermal conductivity |
| Coefficient of Thermal Expansion | 20.2 µm/m·°C | Stable dimensional performance with temperature changes | |
| Melting Point | ≈ 821°C | Lower melting range suitable for casting and forging | |
| Physical | Density | 8.19 g/cm³ | High-density alloy providing strength and stability |
| Electrical Conductivity | ≈ 30% IACS | Moderate conductivity for semi-electrical applications | |
The combination of high tensile strength, excellent corrosion resistance, and good thermal stability makes C69400 Silicon Red Brass a reliable alloy for marine, automotive, and industrial components requiring long-term durability and precision.
Applications
C69400 Silicon Red Brass is used across diverse industries requiring high mechanical strength, corrosion resistance, and wear durability. Its ability to perform in aggressive and high-pressure environments makes it a preferred material for both functional and precision-engineered components.
- Marine Industry: Used for valve stems, pump shafts, propeller components, and marine hardware where excellent seawater resistance and mechanical reliability are essential.
- Industrial Applications: Suitable for valve bodies, gears, bushings, light bearings, and screw-machined parts due to its high strength, machinability, and resistance to corrosion and wear.
- Engineering Components: Ideal for fasteners, connectors, precision-machined parts, and high-pressure fittings where both long service life and structural integrity are critical.
The combination of strength, corrosion resistance, and moderate machinability makes C69400 Silicon Red Brass an excellent choice for marine, hydraulic, industrial, and architectural hardware applications.
Standards & International Equivalents:
C69400 Silicon Red Brass conforms to multiple international material standards, ensuring consistent mechanical performance, chemical integrity, and product reliability across global applications. These standards certify its use in marine, plumbing, and industrial components exposed to high stress and corrosive environments.
| Standard Organization | Designation | Description / Remarks |
|---|---|---|
| UNS | C69400 | Unified Numbering System designation for Silicon Red Brass |
| ASTM | B371 / B371M | Standard specification for Copper–Silicon Alloy Rod, Bar, and Shapes |
| EN / DIN | CW602N | European designation; equivalent to CuZn36Pb2As / Silicon Red Brass |
| BS | CZ127 | British Standard designation for Silicon Red Brass |
| JIS | C6941 (Equivalent) | Japanese Industrial Standard equivalent grade |
| Indian Standard (IS) | IS 11109 | Specification for Silicon Red Brass Rods and Sections |
These standards confirm C69400’s compliance with global material requirements, ensuring its suitability for marine hardware, plumbing components, valves, and mechanical parts where durability and corrosion resistance are critical.
Common Names & International Identifiers
C69400 Silicon Red Brass is recognized worldwide under several trade and industrial names. These designations are widely used by manufacturers, suppliers, and engineering professionals to specify and identify the alloy across different markets and standards.
| Category | Designation / Name | Remarks |
|---|---|---|
| Common Names | Silicon Red Brass, C69400, CuZnSi | Used generally for copper–zinc–silicon alloys with high strength and corrosion resistance |
| Trade Designations | C69400, UNS C69400, CW602N (EN), CZ127 (BS) | International commercial references used for procurement and certification |
| CDA Alloy Number | 694 | Copper Development Association reference number |
These identifiers help ensure material traceability and compatibility across various industrial, marine, and mechanical engineering applications.
Common Product Forms & Dimensions
C69400 Silicon Red Brass is available in a wide range of standard and customized product forms to meet diverse industrial and engineering requirements. Precision manufacturing ensures consistent dimensional accuracy and mechanical integrity across all sections.
| Product Form | Available Size Range | Remarks |
|---|---|---|
| Wire | 1 mm to 8 mm | Supplied in coils or straight lengths |
| Hollow Rods / Bars | Bore: Min 20 mm | OD: Max 100 mm | Available in round, hex, and square cross-sections |
| Round Rods | 6 mm to 130 mm | As extruded or cold drawn condition |
| Hex Bars | 5 mm to 60 mm A/F | Standard and customized profiles available |
| Square Bars | 4 mm to 60 mm A/F | Precision-drawn for tight dimensional tolerances |
| Flat Bars | Thickness: Min 5 mm | Width: Max 120 mm | Ideal for plates, busbars, and machined components |
| Profiles / Sections | As per customer drawing | Custom extrusions and special shapes on request |
| Billets | Up to 200 mm | Suitable for re-melting or extrusion processes |
| Ingots | As per specification | Manufactured for further casting or alloying use |
All materials are supplied with Mill Test Certificates (MTC) in compliance with ASTM B371 / EN CW602N standards and can be customized for special applications on request.
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