Valve Material Reference
ASTM B62 / C83600 Gunmetal / Naval Brass Valve
Naval Brass / Gunmetal (Bronze)Naval brass and gunmetal (leaded tin bronze, ASTM B62, alloy C83600) are the traditional materials for marine, seawater, and low-pressure water service valves.
Form
Cast
Max Temp
+260°C (+500°F) — de-rate for steam above 150°C
Min Temp
−196°C (−320°F) — no embrittlement at cryogenic temperatures
Category
Non Ferrous
Chemical Composition — ASTM B62 / C83600 Gunmetal / Naval Brass
Temperature Range
−196°C to +260°C (−320°F to +500°F)
Maximum Temperature
+260°C (+500°F) — de-rate for steam above 150°C
Minimum Temperature
−196°C (−320°F) — no embrittlement at cryogenic temperatures
Equivalent Grades — ASTM B62 / C83600 Gunmetal / Naval Brass
| Standard | Equivalent Grade |
|---|---|
| BS EN 1982 | CC491K (LTB2) / CC492K (LTB4) |
| DIN | 2.1090 — CuSn5Pb5Zn5 |
| ISO 1338 | CuSn5Pb5Zn5 |
| Lloyd's / DNV | Approved for seawater service |
Suitable Services
Seawater (brackish and full-salinity) cooling and utility systems
Shipboard steam up to PN10 and 200°C
Marine diesel fuel transfer and day-tank valves
Offshore platform firewater, potable water, and utility systems
Potable water distribution (BS EN 17885 / WRAS approved variants)
Low-pressure natural gas distribution (residential and commercial)
Industrial cooling towers with brackish or treated water
Not Suitable For
High-pressure steam above PN25 or 200°C — use carbon or stainless steel
Ammonia and amines — dezincification and SCC risk in all brasses
Concentrated acids or alkalis
High-velocity seawater above 3 m/s — erosion corrosion; use super-duplex or Cu-Ni instead
Valve Body Applications
Seawater service gate and globe valves (PN16 and below) on ships
Marine cooling water system ball and butterfly valves
Offshore platform utility water and diesel transfer valves
Low-pressure steam valve bodies (≤ PN16) in building services
Bronze ball valves for potable water and natural gas (residential)
Shipboard fire main and bilge system valves
Trim Applications
Ball and stem in small brass/bronze ball valves
Disc and seat ring in small bronze globe and gate valves
Typical Valve Types in ASTM B62 / C83600 Gunmetal / Naval Brass
Ball valves: bronze PN40, DN8–DN50, potable water and gas (residential / commercial)
Gate valves: bronze/gunmetal PN16, DN15–DN150, marine and building services
Globe valves: bronze PN25, steam trapping and control
Check valves: swing bronze, pump discharge, marine service
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