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S30403 — ASTM Equivalent

Holding a datasheet that specifies S30403 (UNS)? The valve-grade equivalent, its properties, and certified supply of the matching ASTM grade.

What is the ASTM equivalent of S30403?

S30403 is a UNS designation corresponding to ASTM A182 F304L (F304L Low Carbon SS (Forged)) 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.

A182 F304L

Stainless Steel

F304L Low Carbon SS (Forged) - forged form.

Service temperature-196°C to +425°C
Nominal compositionC ≤ 0.030%, Mn ≤ 2.00%, Si ≤ 1.00%, Cr 18.0–20.0%, Ni 8.0–12.0%, P ≤ 0.045%, S ≤ 0.030%, N ≤ 0.10%. UNS S30403. Yield ≥ 170 MPa.

Typical service: Cryogenic service: liquid nitrogen, liquid oxygen, liquid argon, LNG auxiliary; Pharmaceutical: water-for-injection (WFI), CIP/SIP lines, API synthesis vessels; Food and beverage: dairy, brewing, and bottling service

Also designated:S30403 [UNS]1.4307 - X2CrNi18-9 [EN / DIN]SUS 304L [JIS]304S11 [BS]
Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

Need valves in S30403 / its ASTM equivalent?

We supply A182 F304L valves - the S30403 equivalent - with EN 10204 3.1 material certification. Share the datasheet for a 24-hour quote.

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Engineering references

A182 F304L full grade pageF304L Low Carbon SS (Forged)Equivalence MatrixAll 43 grades across 7 systemsDesignation lookup directoryEvery foreign designation indexed