C84400 Red Brass Machined Components from Castings

Price: US$ 13.40 / Kilogram (Indicative) — Material: C84400 Red Brass (81-3-7-9) | Min. Order: 1 Kilogram | Supply Ability: As per requirement. Price varies by specification, quantity and finish; contact us for a firm quote.

C84400 Red Brass Machined Components,C84400 Red Brass Casting, CDA 844 Casting

Overview: C84400 Red Brass Machined Components from Castings

Brass and Copper Parts manufactures C84400 red brass castings and finish-machines them into precision components from its ISO 9001:2015 certified foundry and CNC machine shop in Jamnagar, India. C84400, commonly known as 81-3-7-9 semi-red brass, is an ASTM B584 leaded copper-tin-zinc casting alloy offering a cost-effective alternative to higher-copper red brasses such as C83600, while retaining good pressure tightness and machinability for valve, plumbing, and general industrial castings. With nominal composition of 81% copper, 3% tin, 7% lead, and 9% zinc, C84400 is specified where slightly lower copper content is acceptable in exchange for improved castability and reduced raw material cost. We supply sand-cast, permanent-mould-cast, and centrifugally cast C84400 components, CNC finish-machined to customer drawing tolerance, with full material traceability for OEM, EPC, and distributor customers.

What is C84400 Red Brass?

C84400 is a copper-tin-zinc-lead casting alloy under the CDA numbering system, standardised in ASTM B584 for sand, permanent mould, and centrifugal castings. With approximately 81% copper (lower than C83600 85% copper), 3% tin, 7% lead, and 9% zinc, C84400 sits in the “semi-red brass” category, bridging the compositional gap between high-copper red brasses (C83600) and higher-zinc yellow/leaded brasses. The higher lead content (6.0-8.0%) relative to C83600 further improves machinability and pressure tightness of castings by filling residual microporosity, while the higher zinc content improves fluidity during casting.

C84400 vs C83600: Compositional and Cost Comparison

C84400 (81-3-7-9) contains approximately 4 percentage points less copper and 4 percentage points more zinc than C83600 (85-5-5-5), reducing material cost given copper is the most expensive constituent element. Mechanical properties of C84400 are broadly comparable to C83600 for general valve and fitting service, though C83600 is often preferred where slightly higher corrosion resistance or dezincification performance is specified. Selection between the two grades is frequently driven by specification requirement, foundry standard practice, and cost optimisation for high-volume castings.

Casting Characteristics of C84400

C84400 exhibits excellent fluidity due to its higher zinc content, making it well suited to thin-wall and complex-geometry castings that would be more difficult to fill consistently in lower-zinc red brass alloys. Pouring temperature range is typically 1000-1120 Degree C. The alloy solidifies with a moderate freezing range, and proper gating/risering design minimises shrinkage porosity in critical wall sections.

CNC Machining of C84400 Cast Components

As-cast C84400 blanks are finish-machined on CNC lathes, machining centres, and boring mills to produce sealing faces, bores, threads, flange bolt patterns, and functional features to drawing tolerance. The 6.0-8.0% lead content gives C84400 a machinability index of approximately 90 relative to the C36000 benchmark, marginally higher than C83600, producing clean chip formation and good surface finish (Ra 1.6-3.2 micrometres as-turned) even on relatively thin-walled cast sections.

Pressure Tightness and Application Suitability

C84400 castings are used for valve bodies, pump housings, and fitting bodies rated to similar 150-250 PSI (1.0-1.7 MPa) working pressure ranges as C83600, in fresh water, general industrial fluid, and low-pressure steam service. Hydrostatic testing at 1.5x-2x rated working pressure confirms pressure integrity of critical castings prior to shipment.

Corrosion Resistance and Market Applications

C84400 offers good general corrosion resistance in fresh water and mild industrial environments, though slightly lower than C83600 due to reduced copper content; for aggressive water chemistry or dezincification-prone service, C83600 or a dedicated DZR bronze is preferred. C84400 remains widely specified for cost-sensitive plumbing fittings, general-purpose valve bodies, and hardware castings where premium corrosion performance is not the primary design driver.

Key Features of C84400 Red Brass Machined Components

• Cost-Effective Casting Alloy: Lower copper content than C83600 reduces raw material cost for equivalent casting volume.
• Excellent Fluidity: Higher zinc content improves mould filling for thin-wall and complex-geometry castings.
• Machinability Index ~90: Clean chip formation and good surface finish on CNC finish-machined features.
• Good Pressure Tightness: Suitable for 150-250 PSI valve, pump, and fitting body applications.
• Multiple Casting Routes: Sand, permanent mould, and centrifugal casting matched to component geometry and volume.
• ASTM B584 Compliance: Standard specification alloy recognised across plumbing and general industrial casting markets.

Thin-Wall and Complex Casting Capability

The higher zinc content in C84400 improves melt fluidity, enabling thin-wall castings (down to approximately 3 mm) and complex internal geometries such as integral passages and cored features that would risk incomplete filling in lower-fluidity red brass alloys, reducing the need for secondary machining of internal features.

CNC Turning and Boring of Cast Components

C84400 cast blanks are machined on CNC lathes and boring mills to produce bores, sealing faces, and threaded connections to +/-0.05-0.1 mm tolerance, with fixture datums referencing as-cast locating features to maintain wall-thickness consistency across the finished component.

Multi-Axis Milling of Valve and Fitting Bodies

Flange bolt patterns, port faces, and non-rotational features on C84400 valve and fitting bodies are machined on 3/4-axis CNC machining centres using multi-part fixturing, reducing per-part cycle time for medium-to-high volume casting programs.

Surface Finish and Plating Options

C84400 components are supplied as-machined, shot-blasted, or plated (nickel or chrome) depending on application; plating is common for decorative plumbing fittings and corrosion-critical components exposed to humid or outdoor environments.

Pressure Testing and Quality Verification

Hydrostatic shell and seat testing at 1.5x-2x rated working pressure, dimensional inspection, and visual inspection are performed on all pressure-critical C84400 castings prior to packing, with test records retained for customer quality audits.

Cost Optimisation for High-Volume Programs

For distributors and OEMs running high-volume standardised fitting or valve body programs, C84400 offers a lower material cost alternative to C83600 while retaining adequate mechanical and corrosion performance for general-service water and industrial applications, improving overall program economics without compromising functional requirements.

Technical Specifications: C84400 Red Brass (81-3-7-9)

C84400 International Grade Equivalents

C84400 Casting and Product Forms

Product Types and Variants

C84400 Valve Bodies and Components

Gate, globe, and check valve bodies and discs cast in C84400 and finish-machined for general water and low-pressure industrial fluid service.

C84400 Plumbing Fittings

Pipe fittings, meter housings, and connector bodies cast and machined for cost-sensitive plumbing and waterworks distribution programs.

C84400 Pump and Fluid Handling Components

Pump casings, impeller hubs, and wear rings cast in C84400 for general-purpose water and fluid handling equipment.

C84400 Bearing Bushings and Sleeves

Centrifugally cast bushings and sleeve bearings finish-bored to tolerance for general industrial machinery applications.

C84400 General Hardware Castings

Custom-pattern castings for connector bodies, machine hardware, and structural components requiring a machinable, cost-effective copper-alloy casting.

Applications by Industry

Manufacturing Process for C84400 Castings and Machined Components

Step 1 – Pattern and Mould Preparation: Patterns designed with appropriate shrinkage allowance; sand moulds or permanent steel dies prepared per component geometry and volume.

Step 2 – Melting and Alloy Control: C84400 charge melted in induction furnace; spectrometric analysis confirms Cu/Sn/Pb/Zn composition before pouring.

Step 3 – Casting: Molten metal poured at 1000-1120 Degree C into sand, permanent mould, or centrifugal casting equipment as applicable.

Step 4 – Fettling and Cleaning: Castings shaken out, gates/risers removed, shot-blasted or tumbled to remove sand and scale.

Step 5 – CNC Finish Machining: Sealing faces, bores, threads, and flange features machined to drawing tolerance on CNC lathes and machining centres.

Step 6 – Pressure Testing: Hydrostatic shell and seat testing at 1.5x-2x rated working pressure per customer procedure for pressure-critical components.

Step 7 – Plating and Surface Finish: Nickel or chrome plating applied per specification where required.

Step 8 – Final Inspection and Packing: Dimensional inspection, material certificate issuance, and export packing with Certificate of Origin.

Quality Standards and Certifications

• ISO 9001:2015 certified quality management system
• Casting alloy certified to ASTM B584; DIN 1705, EN 1982, and IS 306 cross-reference on request
• Material test certificate with spectrometric composition and mechanical property data
• Hydrostatic pressure testing per API 598 / MSS SP-80 or customer procedure
• Dimensional inspection per ISO 8062 casting tolerance grades
• RoHS 2 and REACH declarations provided on request

Why Choose Brass and Copper Parts for C84400 Castings and Machined Components

• Cost-Optimised Alloy Selection: C84400 offered alongside C83600 to match component cost targets without compromising functional performance.
• Integrated Foundry and Machine Shop: Casting and CNC finish-machining under one roof for dimensional consistency and reduced lead time.
• Thin-Wall Casting Expertise: Proven capability for complex, thin-wall C84400 geometries leveraging the alloy high fluidity.
• Pressure-Critical Component Experience: Established hydrostatic testing protocols for valve, pump, and fitting bodies.
• Export-Ready Documentation: Material certificates, pressure test reports, and Certificate of Origin issued as standard.
• Competitive Landed Cost: Direct foundry-to-machining integration in Jamnagar, India, at 25-40% cost saving versus imported castings.

Frequently Asked Questions

What is C84400 red brass used for?

C84400 is used for valve bodies, plumbing fittings, pump housings, and general industrial castings where a cost-effective, machinable, corrosion-resistant copper-alloy casting is required.

What is the difference between C84400 and C83600?

C84400 (81-3-7-9) has lower copper and higher zinc/lead content than C83600 (85-5-5-5), reducing material cost while retaining comparable machinability and pressure tightness. C83600 typically offers marginally better corrosion resistance; C84400 offers better casting fluidity for thin-wall geometries.

Is C84400 suitable for potable water?

Standard C84400 contains 6.0-8.0% lead and does not meet low-lead potable water regulations in some jurisdictions (US Safe Drinking Water Act amendments, California AB 1953). Low-lead alternatives should be specified for potable water contact components in these markets.

What pressure rating can C84400 valve bodies achieve?

C84400 valve bodies and fittings are typically rated 150-250 PSI (1.0-1.7 MPa) for water and low-pressure service, verified by hydrostatic shell and seat testing.

What casting process is used for C84400 components?

Sand casting for prototype and low-to-medium volume or complex geometries; permanent mould casting for medium-to-high volume standardised parts; centrifugal casting for cylindrical bushings and sleeves.

What machining tolerances are achievable on C84400 castings?

Standard finish-machining tolerance is +/-0.05-0.1 mm on critical bores and sealing faces, consistent with other red brass casting alloys.

Can C84400 castings be supplied with plating?

Yes. Nickel plating (corrosion protection) and chrome plating (decorative finish) are available through approved plating partners with coating thickness verification.

Do you provide material certificates for C84400 castings?

Yes. Material test certificates confirming spectrometric composition and mechanical properties, along with dimensional and pressure test reports, are issued for every production batch.

What is the minimum order quantity for C84400 components?

Prototype castings from 10-50 pieces depending on component size; production sand or permanent mould castings from 100-500 pieces; centrifugally cast bushings from 500 pieces.

Can you machine customer-supplied C84400 castings?

Yes. We provide finish-machining services on customer-supplied C84400 castings, including CNC turning, boring, milling, and hydrostatic pressure testing.

Equivalent Terms in Other Languages

Related Products and Linked Terms

• C83600 Red Brass Machined Parts and Castings
• Brass Forging
• HPb59-1 and HPb59-2 Brass Fittings and Brass Components
• Copper Bronze and Brass Casting Category
• Brass Components Category

Request a Quote for C84400 Red Brass Castings and Machined Components

Submit your engineering drawings (DXF, STEP, PDF) specifying C84400 or equivalent semi-red brass grade, casting process preference, pressure rating, and machining requirements. Our technical team responds with a material and process-specific quotation within 24-48 hours.

Email: sales@brass-copper-parts.com | Phone/WhatsApp: +91-22-43449300

Brass and Copper Parts (India) – Plot 10-B, GIDC Industrial Estate, Shankar Tekri, Jamnagar 361004, Gujarat, India.