Brass DZR Parts, Brass DZR Machined Components

Overview: Brass DZR Parts and Brass DZR Machined Components

Brass & Copper Parts manufactures precision Dezincification Resistant (DZR) brass components from its ISO 9001:2015 certified facility in Jamnagar, India. DZR brass is a specially formulated copper-zinc alloy with controlled arsenic (As) or antimony (Sb) additions that provide immunity to dezincification—a selective corrosion mechanism where zinc is leached from the brass matrix in aggressive water environments, leaving behind a weak, porous copper residue. Our DZR brass machined components comply with BS EN 12165, BS EN 12164, and ASTM B283 for hot-pressed and extruded DZR material, and are tested per BS EN ISO 6509 (dezincification resistance test). We supply DZR brass valves, fittings, actuator bodies, meter housings, irrigation components, and precision machined parts to OEM buyers in the UK, Europe, Australia, and the Middle East where potable water standards mandate DZR-grade materials.

What is DZR Brass and Why is it Needed?

Dezincification occurs in standard brass (alpha-beta, Cu-Zn) when exposed to hot, soft, acidic, or high-chloride water at temperatures above 60°C. The zinc component is selectively dissolved, leaving behind a porous copper skeleton that has only 10–15% of the mechanical strength of the original alloy. DZR brass prevents this by inhibiting the de-alloying mechanism through micro-alloying additions: arsenic (0.02–0.10%) in alpha-phase brasses (CW602N / C37710) and antimony or arsenic in alpha-beta brasses (CW602N). DZR compliance is verified by the dezincification resistance test per BS EN ISO 6509, where the depth of dezincification attack after 24 hours in 1% CuCl₂ solution at 75°C must not exceed 200 µm. DZR brass is mandatory for potable water fittings in the UK (WRAS approval), Australia (AS 2345), and increasingly required in EU countries under EN 1254-1/2 and EN 13828 fitting standards.

Key Features of DZR Brass Machined Components

• Dezincification Resistance: Tested to BS EN ISO 6509; maximum dezincification depth ≤ 200 µm, qualifying for WRAS (UK), AS 2345 (Australia), and EN 13828 (Europe) approval.
• Potable Water Compliance: DZR brass parts comply with UK WRAS, Australian WaterMark, and EU Drinking Water Directive (DWD) requirements for water contact materials.
• Good Machinability: DZR brass (CW602N / CW724R) has a machinability index of 70–80, lower than C36000 but adequate for precision CNC turning, milling, and forging operations.
• Pressure Rating: DZR brass valves and fittings are typically rated PN 25 (25 bar) for water service per EN 13828 and BS EN 13244.
• Temperature Range: Continuous service to 110°C (for solar thermal and HVAC hot water circuits) without dezincification onset.
• Lead Content Options: Standard DZR (CW602N / CW724R) contains 1.5–3.0% Pb. Low-lead (≤0.25% Pb) DZR grades available for stricter potable water jurisdictions (California Prop. 65, NSF 61 Annex G).
• Thread and Fitting Standards: DZR fittings produced to BS 5154, EN 1254-2, ISO 4422, and BS EN 13828 dimensional and pressure rating requirements.

Technical Specifications: DZR Brass Alloys

International DZR Brass Grade Equivalents

Product Types and Variants

DZR Brass Valve Bodies and Ball Valves

DZR brass ball valve bodies, gate valve bodies, and globe valve bodies machined from CW602N hot-pressed brass forgings are the primary product in our DZR range. These components are rated PN 25 (25 bar) per BS EN 13828 and feature full-bore or reduced-bore internal profiles, ISO 5211 actuator interfaces, and BSP or ISO 228 threaded end connections. Bore to OD concentricity is held within 0.02 mm TIR; seat face angles are machined to ±0.25° for positive shutoff with brass or PTFE ball seats. WRAS-approved material test certificates are supplied with each valve body lot.

DZR Brass Compression Fittings

DZR compression fitting bodies—including straight couplings, elbows, tees, and reducers—comply with BS EN 1254-2 (compression fittings for copper tubes) and are manufactured from CW602N or CW724R DZR brass. Olive (ferrule) seating geometries and thread lead-in chamfers are precision machined for consistent pull-off strength and leak-free performance to 35 bar operating pressure. All production batches are dezincification-tested per EN ISO 6509. WRAS (UK) and WaterMark (Australia) listing documentation is available for qualifying part numbers.

DZR Brass Gate and Isolation Valves

Gate valve bodies, wedge housings, bonnet assemblies, and gland nut components for isolating and regulating valves in hot and cold water plumbing systems are produced from CW602N DZR forgings and machined to BS 5154 (copper alloy globe, globe stop and check, check and gate valves for general purposes). These components operate at PN 16/PN 25 pressure ratings and service temperatures from -10°C to +110°C. Forged body blanks are sourced from accredited Indian press-forging houses and finish-machined in our CNC turning and VMC centres.

DZR Brass Meter Housings and Actuator Bodies

Precision DZR brass housings for water meters, gas meters, flow meters, and pneumatic actuator bodies require both dezincification resistance and tight dimensional tolerances for metering accuracy and seal integrity. We produce from CW602N bar or forging with internal bores held to H7 tolerance, external threads to 6g/6H class, and sealing face flatness within 0.01 mm. Pressure testing (hydrostatic at 1.5× PN rating) and leak testing are performed on 100% of each lot for critical metering applications.

DZR Brass Irrigation and Agricultural Fittings

Irrigation valve bodies, filter housings, emitter adaptors, and sprinkler heads in DZR brass are supplied for agricultural and landscape irrigation systems where water chemistry (chlorination, pH variation, soil contact condensation) creates dezincification risk. DZR brass provides long service life in these aggressive environments compared to standard brass. Components comply with ISO 4422 (PE pipe systems) dimensional requirements and AS 4176 (irrigation equipment) as applicable. Production runs typically from 5,000 to 500,000 pieces per annum.

DZR Brass Custom and OEM Machined Components

Beyond standard catalogue forms, we machine custom DZR brass components to OEM engineering drawings—including non-standard porting configurations, special thread forms, unusual valve geometries, and multi-port manifold bodies. CW602N bar or forging stock is used based on geometry complexity and pressure requirements. First-article inspection reports, material certifications, and dezincification test certificates accompany new part introductions. We hold CW602N bar stock in diameters from 12 mm to 80 mm for quick-turnaround prototype and small-batch production.

Applications by Industry

Manufacturing Process for DZR Brass Components

Step 1 – DZR Material Sourcing and Verification: CW602N or CW724R bar/forging stock is sourced from EN 12165/12164 certified mills with EN 10204 3.1 MTCs. XRF spectrometry verifies Cu, Zn, Pb, and As content. Dezincification resistance test coupons from each heat are tested per EN ISO 6509 before use in production.

Step 2 – Forging (if applicable): For valve body blanks, hot-press forging in closed dies at 650–750°C produces near-net-shape blanks from CW602N billets. Forgings are solution annealed and pickled before machining. Forging quality is verified by 100% dimensional check and sample cross-section metallographic inspection.

Step 3 – CNC Turning and VMC Machining: Forging blanks or bar stock are CNC turned and/or VMC milled to achieve internal bores, port threads, seating faces, and external geometry. DZR brass’s slightly lower machinability (index 70 vs. 100 for C36000) requires optimized cutting speeds (80–150 m/min) and carbide tooling to maintain tool life and surface finish.

Step 4 – Thread Machining and Gauging: BSP, NPT, or metric threads are single-point cut or tap-formed. Go/No-Go thread gauges verify every critical thread. Thread form geometry is inspected by optical comparator or CMM on first-off samples.

Step 5 – Deburring, Cleaning, and Pressure Testing: Deburring of all ports and passages, ultrasonic cleaning, and hydrostatic pressure testing (100% for pressure-rated valves and fittings) complete the machining stage.

Step 6 – Dezincification Test Verification: Sample coupons from each production batch are dezincification-tested per BS EN ISO 6509 (24 hours in 1% CuCl₂ at 75°C). Results are reported on the batch certificate. Dezincification depth must be ≤ 200 µm.

Step 7 – Surface Treatment: Optional bright or matte tin plating, nickel plating, or lacquering for aesthetic and corrosion protection. Surface treatment is specified per customer or applicable standard (WRAS/WaterMark conditions).

Step 8 – Final Inspection and Export Documentation: CMM dimensional report, dezincification test certificate, hydrostatic pressure test certificate, material MTC, packing list, and Certificate of Origin accompany each shipment.

Quality Standards and Certifications

• ISO 9001:2015 Quality Management System
• DZR brass material per EN 12165 (CW602N), EN 12164 (CW724R), ASTM B283
• Dezincification resistance test per BS EN ISO 6509 (≤ 200 µm, Class DR)
• WRAS (UK Water Regulations Advisory Scheme) compliance documentation available
• WaterMark (Australia) and AS 2345 compliance support
• EN 13828 (brass fittings for gas), EN 1254-2 (compression fittings) dimensional compliance
• Pressure testing to BS 5154 / EN 13828 PN 25 rating requirements
• RoHS 2 Annex III 6(c) exemption for lead content in copper alloys
• EN 10204 Type 3.1 MTC and DZR test certificates with each order

Why Choose Brass & Copper Parts for DZR Machined Components

• DZR Alloy Expertise: Experienced in CW602N/CW724R DZR brass machining for 29+ years; dedicated material stocks maintained for rapid delivery.
• Tested Compliance: In-house EN ISO 6509 dezincification testing and WRAS/WaterMark documentation support for UK and Australian market entry.
• Forging + Machining Integration: Coordinated hot-press forging and CNC machining under one quality system for valve bodies and complex housings.
• Pressure Testing: Hydrostatic and pneumatic pressure testing facilities for 100% testing of valve bodies and fittings to PN 25 requirements.
• Regulatory Expertise: Technical team supports customers through WRAS, WaterMark, and EU DWD approval processes with required material data and test reports.
• Cost-Competitive: Indian manufacturing cost base provides 25–40% cost advantage vs. European DZR brass machining while maintaining equivalent quality levels.

Frequently Asked Questions

What is dezincification and why is DZR brass needed?

Dezincification is selective corrosion of zinc from brass alloys in aggressive water (hot, soft, acidic, or high-chloride). It leaves a porous copper residue with very low mechanical strength, causing leaks or valve failures. DZR brass with arsenic additions prevents this; it is mandatory for potable water fittings in the UK (WRAS), Australia (WaterMark), and recommended throughout Europe.

What is the BS EN ISO 6509 dezincification test?

BS EN ISO 6509 exposes brass specimens to 1% copper chloride (CuCl₂) solution at 75°C for 24 hours. Cross-sections are then polished and the maximum depth of dezincification attack is measured by optical microscopy. For DZR classification, the dezincification depth must not exceed 200 µm.

What is the difference between CW602N and CW724R DZR brass?

CW602N (CuZn36Pb2As) is an alpha-beta DZR brass with 60–63% Cu and 1.5–2.5% Pb, optimised for hot-press forging (good hot workability). CW724R (CuZn33Pb1.3As) is an alpha-phase DZR brass with 63.5–66.5% Cu and lower Pb (0.9–1.7%), used for extruded rod and bar where dezincification resistance is required with better cold formability.

Does DZR brass meet WRAS requirements for the UK?

Yes, provided the specific product is made from a WRAS-listed material (CW602N or CW724R tested per EN ISO 6509) and complies with all relevant dimensional and pressure standards. We supply material certifications and EN ISO 6509 test certificates to support customer WRAS product approval applications.

Is DZR brass lead-free?

Standard DZR brass (CW602N, CW724R) contains 0.9–2.5% lead. Low-lead DZR grades (Pb ≤ 0.25%) exist for California Prop. 65 and NSF 61 Annex G compliance. We supply both standard and low-lead DZR on request.

What pressure rating do your DZR brass valves and fittings carry?

Standard DZR brass compression fittings per EN 1254-2 are rated PN 25 (25 bar) at ambient temperature, derated to PN 16 at 100°C. Ball valve bodies per EN 13828 are rated PN 25. Actual ratings depend on wall thickness, thread type, and operating temperature.

Can you supply DZR brass components with WRAS approval documentation?

We supply the material certifications, EN ISO 6509 test certificates, and dimensional reports required for customers to submit for WRAS product approval. The WRAS approval itself is granted to the product by the customer as the brand owner, not to us as the manufacturer.

What is the typical lead time for DZR brass machined components?

Standard machined DZR components from bar or forging: 4–6 weeks. Components requiring custom forging dies: 8–10 weeks for first article. Repeat orders with existing tooling: 3–4 weeks.

What is the minimum order quantity for DZR brass parts?

Custom machined DZR parts from bar stock: 500 pieces minimum. Forged DZR body blanks for valve production: 1,000 pieces minimum for economic forging die usage. Prototypes and samples: 50–100 pieces.

Can DZR brass be used in solar thermal systems?

Yes. DZR brass (CW602N) is approved for solar thermal circuits operating to 110°C with glycol-water heat transfer fluids. The dezincification resistance is maintained at elevated temperatures and with typical glycol inhibitor chemistries (pH 7–9).

Request a Quote for DZR Brass Machined Components

Provide component drawings (DXF, STEP, or PDF), required material grade (CW602N or CW724R), applicable standard (WRAS/WaterMark/EN 13828), quantity, and delivery requirements. Our technical team will respond within 24–48 hours with a competitive quotation and compliance documentation plan.

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

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