When you select a brass ball valve, you are really choosing the material that will handle your pressure, temperature and media over years of operation. In Indian plumbing and industrial projects, CW617N and CW614N are two of the most common brass grades you see in datasheets and on valve bodies.

Both are copper–zinc–lead alloys, but they are not identical. CW617N is a forging brass optimised for hot forged valve bodies, while CW614N is a free‑machining brass designed mainly for turned parts from bar stock.

What are CW617N and CW614N?

  • CW617N (CuZn40Pb2)
    • Copper: approx. 57–59%
    • Lead: about 1.6–2.5%
    • Balance zinc.
    • Classified as forging brass under EN 12165 / EN 12420, widely used for hot‑forged valve bodies, fittings and manifolds.
  • CW614N (CuZn39Pb3, CZ121)
    • Copper: approx. 57–59%
    • Lead: about 2.5–3.5%
    • Balance zinc.
    • Classified as free‑machining brass (EN 12164 / EN 12167) for high‑speed turning of bars into precision components.

The higher lead content in CW614N significantly improves chip breaking and machinability but slightly reduces mechanical properties compared to CW617N.

Composition and properties: why the lead level matters

Feature

CW617N (CuZn40Pb2)

CW614N (CuZn39Pb3)

Typical Cu (%)

57–59

57–59

Typical Pb (%)

1.6–2.5

2.5–3.5

Main product form

Forgings, profiles, rods

Rods and bars for turning

Key advantage

Hot forgeability for valve bodies

Maximum machinability

Typical use in valves

Bodies, connectors, manifolds

Stems, small fittings, nuts
  • CW617N’s lower lead content helps achieve sound, dense forgings with good strength and elongation, essential for pressure‑retaining parts like ball valve bodies.
  • CW614N, with more lead, gives excellent tool life and surface finish on CNC and automatic lathes, making it ideal for stems, connectors and small precision parts.

Performance in ball valves and plumbing applications

CW617N in ball valve bodies

Most reputable brass ball valve manufacturers in India and Europe specify CW617N for forged bodies and end pieces.

  • Designed for hot forging: CW617N is covered by forging stock standard EN 12165 and is the reference alloy for hot‑stamped valves and fittings.
  • Good mechanical properties: tensile strength typically 380–430 MPa with reasonable elongation, suitable for PN25–PN40 class ball valves when combined with proper design.
  • Proven in the field: CW617N brass ball valves are widely used in water, oil and non‑aggressive fluids in Indian building services, fire lines, compressed air and general industry.

CW614N in turned parts

CW614N is rarely used for forged bodies, but it is extremely popular for machined components inside and around the valve.

  • Excellent machinability: often quoted as having “the highest machinability” among copper alloys, ideal for mass‑produced turned parts.
  • Typical valve uses: stems, adaptors, connectors, nuts and small fittings produced from round or hex bars.

This combination – CW617N for the body and CW614N for the ball or stem – is common among quality brass valve manufacturers.

Potable water, RoHS and DZR considerations

For drinking water and domestic plumbing, lead content and dezincification resistance are critical.

  • Both CW617N (1.6–2.2% Pb) and CW614N (2.5–3.5% Pb) are recognised alloys in European drinking water regulations, but CW617N’s lower lead level aligns better with RoHS limits and several national positive lists.
  • Some experts recommend avoiding high‑lead CW614N in direct contact with clean drinking water, particularly in aggressive water chemistries, favouring CW617N or DZR brass instead.
  • For highly aggressive or high‑risk potable water applications, DZR (Dezincification Resistant) brass grades are preferred over standard CW617N, but CW617N remains a strong choice for general plumbing and non‑aggressive municipal water.

For Indian projects following European‑influenced specs, CW617N or DZR brass for the body with CW614N for non‑wetted or secondary parts gives a good balance of compliance and cost.

CW617N vs CW614N: which is better for ball valves?

If we focus on the valve body and main pressure‑containing parts, CW617N clearly wins.

  • Specifically developed as a forging brass for valves and fittings.
  • Offers stronger, more reliable forged bodies suitable for PN25–PN40 ball valves commonly used in India.
  • Better aligned with modern potable‑water and RoHS expectations than higher‑lead CW614N.

CW614N is the better choice when the priority is ultra‑fast machining of bar stock for stems, adapters and small fittings, not for the main valve body.

In practice, the best brass ball valves use CW617N for the body and major flow‑path components, and CW614N for certain turned parts where machinability translates into lower cost and faster delivery.

How Poline Technologies uses these alloys

Poline Technologies Pvt. Ltd., based in Surat, Gujarat, is recognised as a specialist manufacturer of brass ball valves, brass gas valves and other flow‑control solutions for the Indian market.

For forged brass ball valves, Poline follows international practice by preferring CW617N forging brass for critical pressure‑retaining components and by evaluating free‑machining alloys like CW614N for suitable machined parts, depending on pressure rating, media and customer specification.

This approach helps ensure consistent quality, reliable sealing and competitive pricing for OEMs, distributors and contractors across India.

When should you specify CW617N or CW614N?

For engineers, purchase teams and contractors in India:

  • Specify CW617N (or CW617N/DZR) for:
    • Forged ball valve bodies and end caps
    • Plumbing and HVAC valves in residential and commercial buildings
    • Industrial water, air and oil services within PN25–PN40 ranges.
  • Allow CW614N for:
    • Turned stems, nuts, adaptors and small fittings
    • Components where machinability is more important than forging strength and the wetted surface area is limited.