Equivalent lookup
Designation Cross-Reference

Alloy 6 — ASTM Equivalent

Holding a datasheet that specifies Alloy 6 (Stellite (Kennametal))? The valve-grade equivalent, its properties, and certified supply of the matching ASTM grade.

What is the ASTM equivalent of Alloy 6?

Alloy 6 is a Stellite (Kennametal) designation corresponding to ASTM Stellite 6 (Cobalt-Chromium-Tungsten, UNS R30006) (Stellite 6 Hard-Face Trim) 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.

Stellite 6 (Cobalt-Chromium-Tungsten, UNS R30006)

Non-Ferrous

Stellite 6 Hard-Face Trim - both form.

Service temperature-196°C to +800°C
Nominal compositionCo bal. (~52%), Cr 27–32%, W 3.5–5.5%, C 0.9–1.4%, Ni ≤ 3%, Fe ≤ 3%, Mo ≤ 1%, Si ≤ 2%. Hardness: 36–45 HRC (deposited). UNS R30006.

Typical service: High-temperature steam valves above 260°C in power plant service; API 600 gate valves in refinery and petrochemical service per API 600 trim #8, #10, #12; Geothermal and nuclear power plant isolation valves

Also designated:Stellite 6 [Stellite (Kennametal)]Alloy 6 [Stellite (Kennametal)]ISO 14920 cobalt-base hard-face alloys [ISO]DIN 32529 cobalt hard-surfacing [DIN]
Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

Need valves in Alloy 6 / its ASTM equivalent?

We supply Stellite 6 (Cobalt-Chromium-Tungsten, UNS R30006) valves - the Alloy 6 equivalent - with EN 10204 3.1 material certification. Share the datasheet for a 24-hour quote.

Request a Quote WhatsApp Call
Products
Browse All Valve Products

Engineering references

Stellite 6 (Cobalt-Chromium-Tungsten, UNS R30006) full grade pageStellite 6 Hard-Face TrimEquivalence MatrixAll 43 grades across 7 systemsDesignation lookup directoryEvery foreign designation indexed