CuSn5Zn5Pb5-C · Rg5
Tin-zinc-lead bronze (gunmetal). Thanks to its good castability, pressure tightness and resistance to water, it is the classic material for small valve bodies, check valve discs and fittings.
- Rp0.2 · MPa
- ≥ 90
- Rm · MPa
- ≥ 200
- TEMPERATURE
- −10 … +180 °C
- COST
Chemical composition
%. The Cu value includes Ni.
Mechanical properties
| STANDARD · CONDITION | Rp0.2 MPa | Rp1.0 MPa | Rm MPa | A % | KV J |
|---|---|---|---|---|---|
| EN 1982 · sand casting (GS) | 90 | — | ≥ 200 | 13 | 60 HB |
| EN 1982 · continuous casting (GC) | 110 | — | ≥ 250 | 13 | 65 HB |
Minimum values by casting method. The last column is Brinell hardness (HB).
Service temperature
PN16 bronze valves are rated for full pressure up to 120 °C; above that the rating drops quickly (~10 bar at 150 °C, ~6 bar at 200 °C).
This is the limit of the material itself. A valve's service temperature is usually set by the seal and seat materials; product pages give it for each seal option.
Physical properties and heat treatment
- DENSITY
- 8.7 g/cm³
- THERMAL CONDUCTIVITY
- 71 W/m·K
Media suitability GENERAL TREND
Emsal assessment. The final choice is made from corrosion tables, taking concentration, temperature, chloride content and flow velocity into account.
Strengths and weaknesses
Strengths
- Very good castability and pressure tightness
- Good resistance in fresh water and mild seawater
- Easy to machine (lead)
- Good behaviour in friction and wear
Weaknesses
- Contains lead: drinking water applications require a lead-free alloy
- Risk of stress corrosion in ammonia and caustics
- Low strength: limited at high pressure and in large sizes
Manufacturing and use
- ECONOMY
- Medium to high. Depends on the copper price; competitive with stainless steel in small sizes.
- MANUFACTURING METHODS
- Sand casting · Gravity die and centrifugal casting · Continuous cast bar
- TYPICAL VALVE PARTS
- Body (small sizes) · Disc · Seat ring · Bushing
Used in 19 Emsal products
- 001Wafer check valveBody · Disc
- 002Disc check valveBody · Bonnet · Stem · Disc
- 005Short pattern swing check valveBody · Disc
- 007Threaded swing check valveBody · Bonnet · Disc · Plug
- 030Flanged Y-strainerBody · Bonnet
- 031Threaded Y-strainerBody · Cover · Plug
- 033Flanged T-strainerBody · Bonnet
- 070Flanged 2-piece ball valveBody · End cap · Ball
- 078Threaded 2-piece ball valveBody · Bonnet
- 080Wafer ball valveBody · Bonnet
- 130Flanged gate valveBody · Bonnet · Gate · Indicator
- 132Threaded gate valveBody · Bonnet · Gate
- 250Full lift flanged safety valveBody · Cover · Top cover
- 251Angle safety valve with leverBody
- 252Angle safety valveBody
- 390Slip-on flangeBody
- 391Threaded flangeBody
- 392Weld neck flangeBody
- 393Blind flangeBody
Source: EN 1982. Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.