Designation Cross-Reference

FGS 400 — ASTM Equivalent

Holding a datasheet that specifies FGS 400 (BS EN)? The valve-grade equivalent, its properties, and certified supply of the matching ASTM grade.

What is the ASTM equivalent of FGS 400?

FGS 400 is a BS EN designation corresponding to ASTM A395 / ISO 1083 GGG-40 (Ductile Iron (Nodular Cast Iron)) 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.

A395 / ISO 1083 GGG-40

Non-Ferrous

Ductile Iron (Nodular Cast Iron) - cast form.

Service temperature-20°C to +350°C

Nominal compositionFe bal., C 3.2–3.8%, Si 1.8–2.8%, Mn ≤ 0.50%, Mg 0.025–0.065% (nodulariser), P ≤ 0.08%, S ≤ 0.02%. GGG-40: min tensile 420 MPa, yield 250 MPa, elongation ≥ 15%.

Typical service: Potable water and municipal water distribution (with approved lining); Industrial firewater and fire protection systems per NFPA 13; HVAC chilled water, condenser water, and heating circuits

Also designated:GGG-40 [ISO 1083]GJS-400-15 [ISO 1083]EN-GJS-400-15 [EN 1563]GGG-40 [DIN]FGS 400 [BS EN]12 [BS EN]FCD 400 [JIS]

Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

Need valves in FGS 400 / its ASTM equivalent?

We supply A395 / ISO 1083 GGG-40 valves - the FGS 400 equivalent - with EN 10204 3.1 material certification. Share the datasheet for a 24-hour quote.

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Engineering references

A395 / ISO 1083 GGG-40 full grade pageDuctile Iron (Nodular Cast Iron)Equivalence MatrixAll 43 grades across 7 systems Designation lookup directoryEvery foreign designation indexed