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CC491K — ASTM Equivalent

Holding a datasheet that specifies CC491K (BS EN 1982)? The valve-grade equivalent, its properties, and certified supply of the matching ASTM grade.

What is the ASTM equivalent of CC491K?

CC491K is a BS EN 1982 designation corresponding to ASTM B62 / C83600 Gunmetal / Naval Brass (Naval Brass / Gunmetal (Bronze)) for industrial valve service. The full grade data is below - equivalence is by nominal chemistry and mechanical class, so confirm composition and heat-treat condition against the governing standard before substituting in critical service.

B62 / C83600 Gunmetal / Naval Brass

Non-Ferrous

Naval Brass / Gunmetal (Bronze) - cast form.

Service temperature-196°C to +260°C
Nominal compositionC83600 (Gunmetal LTB2): Cu 84–86%, Sn 4–6%, Pb 4–6%, Zn 4–6%. Naval brass (C46400): Cu 59–62%, Zn bal., Sn 0.5–1.0% (wrought). Gunmetal preferred for casting.

Typical service: 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

Also designated:CC491K (LTB2) [BS EN 1982]CC492K (LTB4) [BS EN 1982]2.1090 - CuSn5Pb5Zn5 [DIN]CuSn5Pb5Zn5 [ISO 1338]Approved for seawater service [Lloyd's / DNV]
Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

Need valves in CC491K / its ASTM equivalent?

We supply B62 / C83600 Gunmetal / Naval Brass valves - the CC491K equivalent - with EN 10204 3.1 material certification. Share the datasheet for a 24-hour quote.

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Engineering references

B62 / C83600 Gunmetal / Naval Brass full grade pageNaval Brass / Gunmetal (Bronze)Equivalence MatrixAll 43 grades across 7 systemsDesignation lookup directoryEvery foreign designation indexed