C27450 Low-Lead Brass · NSF 372 Lead-Free Brass Bars · CuZn36 Low-Pb · C27450 Brass Components & Fittings
C27450 is a dezincification-resistant (DZR), lead-free-compliant brass developed for potable-water and general plumbing hardware. Based on a high-copper CuZn36-type composition of roughly 63% copper and 36.5% zinc with lead held to 0.25% maximum, it combines dezincification resistance with NSF/ANSI 372 lead-free compliance, so it stands up to aggressive and chlorinated waters while remaining economical and easy to fabricate. This guide covers its full chemistry, mechanical and physical properties, standard sizes, typical components and the industries it serves — plus a built-in round & hex bar weight calculator.
What Is C27450 Brass?
C27450 is a dezincification-resistant, low-lead brass — a high-copper CuZn36-type alloy with lead capped at 0.25% so that its weighted-average lead content meets NSF/ANSI 372 and US “lead-free” plumbing legislation. Its high copper (predominantly alpha) structure, supplied in the DZR-conditioned state, resists the selective leaching of zinc that attacks ordinary brass in soft, acidic or chlorinated waters, while the reduced lead keeps it compliant for drinking-water use. It carries the UNS number C27450 and corresponds to a low-lead CuZn36 (EN CW506L family). Where the highest machining rate is the priority instead, leaded C36000 is faster; where a leaded DZR grade is acceptable, CW602N / CZ132 is the classic choice; and where maximum strength with lead-free dezincification resistance is needed, silicon brass C69300 is the alternative.
Chemical Composition
| Element | Symbol | Content (%) |
|---|---|---|
| Copper | Cu | 62.0 – 64.0 |
| Lead (max) | Pb | 0.25 |
| Iron (max) | Fe | 0.30 |
| Zinc | Zn | Balance (≈ 36.5) |
Lead is capped at 0.25% so the weighted-average lead of finished wetted parts meets NSF/ANSI 372. The high-copper, predominantly alpha composition, supplied in the DZR-conditioned state, gives dezincification resistance.
Mechanical Properties
| Property | Value | Unit |
|---|---|---|
| Tensile strength (Rm) | ≈ 435 | MPa |
| 0.2% proof stress (Rp0.2) | ≈ 325 | MPa |
| Elongation at fracture (A) | ≈ 25 | % |
| Hardness | ≈ 68 | HRB |
| Machinability rating | ≈ 70 | % |
Strength is comparable to standard yellow brass; values shown are for hard-drawn rod. Softer tempers give higher elongation for forming and bending. The alloy is not hardenable by heat treatment.
Physical Properties
| Property | Value | Unit |
|---|---|---|
| Density | 8.44 | g/cm³ |
| Melting range (liquidus) | ≈ 915 | °C |
| Modulus of elasticity | ≈ 100 | GPa |
| Thermal conductivity | ≈ 116 | W/(m·K) |
| Coefficient of thermal expansion (20–300 °C) | ≈ 20.5 | ×10⁻⁶/K |
| Electrical conductivity | ≈ 27 | % IACS |
Machinability & Fabrication
With lead reduced to trace levels, C27450 does not machine as freely as leaded C36000, but at around 70% machinability it still turns, drills and threads well on CNC and Swiss-type equipment with appropriately adjusted feeds, sharp tooling and good chip control. It has excellent hot and cold formability — it hot-forges and hot-stamps cleanly at 650–750 °C and cold-heads and bends readily — which makes it a practical low-lead substitute for standard yellow-brass forgings and fittings. It accepts nickel, chrome and tin plating.
Typical Sizes & Product Forms
Brass Parts India supplies C27450 in drawn, extruded and forged forms. Common stock dimensions:
| Form | Size range | Standard |
|---|---|---|
| Round rod / bar | 3 – 110 mm dia | ASTM / EN 12164 |
| Hexagonal rod (across flats) | 3 – 70 mm A/F | EN 12164 |
| Square rod | 4 – 55 mm | EN 12164 |
| Hollow / bored rod | Custom bore | EN 12164 |
| Forging stock & profiles | To drawing | EN 12165 |
| Wire | 1 – 12 mm | EN 12166 |
Common Parts Manufactured from C27450 Brass
- Low-lead valve bodies
- Plumbing fittings & adaptors
- Water-meter components
- Compression & push-fit fittings
- Threaded inserts
- Faucet parts
- Gas fittings
- Hose fittings
- Connector bodies
- Manifold blocks
- Fasteners
- Precision turned components
Industries Served
- Potable water & plumbing
- Sanitary ware
- Gas distribution
- Building services
- Instrumentation
- HVAC & refrigeration
- General engineering
- Electrical accessories
C27450 Brass Weight Calculator
Enter a diameter (round bar) or across-flats size (hex bar) and a length to estimate the weight of C27450 based on a density of 8.44 g/cm³.
C27450 Brass Weight Calculator — Round & Hex Bars
Per piece4.171kg
Per metre4.171kg/m
Total41.71kg
Indicative only. Based on C27450 Brass density 8.44 g/cm³ (8440 kg/m³). Round: area = π/4 × d². Hex: area = (√3/2) × A/F². Actual weights vary with tolerance and exact alloy composition.
Quick Reference — Weight per Metre (kg/m)
| Size (mm) | Round bar (kg/m) | Hex bar A/F (kg/m) |
|---|---|---|
| 6 | 0.239 | 0.263 |
| 8 | 0.424 | 0.468 |
| 10 | 0.663 | 0.731 |
| 12 | 0.955 | 1.053 |
| 16 | 1.697 | 1.871 |
| 19 | 2.393 | 2.639 |
| 20 | 2.652 | 2.924 |
| 25 | 4.143 | 4.568 |
| 30 | 5.966 | 6.578 |
| 36 | 8.591 | 9.473 |
| 40 | 10.606 | 11.695 |
| 50 | 16.572 | 18.273 |
International Equivalents
| Standard / Region | Designation |
|---|---|
| USA (UNS) | C27450 |
| EN (Europe, nearest) | CuZn36 low-Pb (CW506L family) |
| ASTM (similar, higher Pb) | C27000 yellow brass |
| Trade description | Low-Lead DZR Brass |
| Compliance | NSF/ANSI 372 · DZR (ISO 6509) · RoHS (exemption 6c) |
Frequently Asked Questions
What is C27450 brass?
C27450 is a low-lead yellow brass — a CuZn36-type alloy of about 63% copper and 36.5% zinc with lead held to 0.25% maximum — developed so that finished wetted parts meet NSF/ANSI 372 lead-free plumbing rules.
Is C27450 lead-free?
It is “lead-free” in the regulatory sense: its lead is capped at 0.25%, so the weighted-average lead of drinking-water parts satisfies NSF/ANSI 372 and the US Safe Drinking Water Act. It is more precisely described as a low-lead brass rather than zero-lead.
Is C27450 a DZR (dezincification-resistant) brass?
Yes. C27450 is supplied as a dezincification-resistant, low-lead brass: its high-copper, predominantly alpha composition in the DZR-conditioned state resists the selective loss of zinc in aggressive, chlorinated or soft waters, and it can be qualified to the ISO 6509 dezincification test. It combines that DZR performance with NSF/ANSI 372 lead-free compliance.
What is the density of C27450?
8.44 g/cm³ (8,440 kg/m³). The weight calculator above uses this value.
What is the chemical composition of C27450?
Approximately 62–64% copper, up to 0.25% lead, up to 0.30% iron, and the balance zinc (≈ 36.5%).
How machinable is C27450?
Around 70% of the C36000 free-cutting benchmark. It machines well with sharp tooling and adjusted feeds, but not as freely as fully leaded brass because most of the lead has been removed.
What is the tensile strength of C27450?
About 435 MPa for hard-drawn rod, with roughly 325 MPa proof stress and 25% elongation. Softer tempers trade strength for formability.
Can C27450 be forged?
Yes. It hot-forges and hot-stamps cleanly at 650–750 °C and cold-forms well, making it a good low-lead replacement for standard yellow-brass forgings and fittings.
What is C27450 used for?
Low-lead plumbing and water hardware: valve bodies, fittings, meter parts, compression fittings, faucet components, connectors and general turned parts that must meet lead-free rules.
What is the melting point of C27450?
The liquidus is around 915 °C; hot working is done at about 650–750 °C.
Is C27450 RoHS compliant?
Yes — it complies with RoHS, with copper-alloy lead covered under exemption 6(c). Its low lead level also supports broader environmental and drinking-water compliance.
How does C27450 compare with C69300 Eco Brass?
Both are lead-free and dezincification-resistant. C27450 is a high-copper DZR brass that is economical and easy to fabricate; C69300 is a silicon brass that adds much higher strength (tensile close to mild steel) at a higher price. Choose C27450 for cost-effective DZR plumbing hardware and C69300 where strength or the highest corrosion performance is critical.
Can C27450 be plated?
Yes. It accepts nickel, chrome and tin plating for decorative and corrosion-resistant finishes.
What sizes does Brass Parts India supply in C27450?
Round bar 3–110 mm, hex 3–70 mm across flats, square up to 55 mm, plus hollow rod, wire and forging stock. Custom sizes to drawing.
How do I calculate the weight of a C27450 bar?
Use the calculator above, or multiply cross-sectional area by length by density (8.44 g/cm³). Round area = π/4 × d²; hex area = (√3/2) × (across-flats)².
Is C27450 recyclable?
Yes. It is fully recyclable, and its low lead content makes scrap handling and recovery simpler than for leaded grades.
Can Brass Parts India supply C27450 parts with compliance certificates?
Yes. We provide finished C27450 components with chemical and mechanical certificates and NSF/ANSI 372 lead-free documentation for export markets.
Related Brass Alloys
Comparing grades? Explore our companion guides — each with full specifications, typical parts and a live weight calculator.
C36000 / CDA 360Leaded free-cutting brass — 100% machinability benchmark.Read guide →C69300 / Eco Brass (CW724R)Lead-free silicon brass — high strength, dezincification-resistant.Read guide →CZ132 / CW602N DZR BrassArsenical DZR brass — for aggressive & chlorinated waters.Read guide →
Need Low-Lead C27450 Bars or Components?
Brass Parts India machines, forges and stamps C27450 low-lead brass to your drawings, with NSF/ANSI 372 compliance documentation — from a 90,000 sq ft integrated Jamnagar facility exporting worldwide. Send your part print for a fast quotation.
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