What does the designation 1.4404 mean?

It is the EN numerical designation (EN 10027-2 standard) for 316L. Every grade standardised in Europe carries a four-digit EN number after the 1. prefix (steels) or an alloy prefix for nickel and copper alloys.

Are the equivalences in this table 100% exact?

No: these are common equivalences, not identities. Two designations considered equivalent can have slightly different composition ranges — see the Limits section below.

Why do some JIS or UNS cells show a dash?

Some grades have no official designation in that reference system — this is the case for several special alloys in JIS, for example. A dash signals a real absence, never an unfilled value.

Can I search with or without dots and spaces?

"1.4404", "1 4404" and "14404" all return the same result. The search also ignores case — "sus316l" works as well as "SUS316L".

My grade is not in this table, what should I do?

This table covers 26 grades, not a closed catalogue — new entries are added as sessions progress. In the meantime, send us your designation directly through a quote request.

TECHNICAL TOOL

Grade equivalents

One designation — EN, AISI, UNS or JIS — and every standard equivalent, instantly.

Search a designation (1.4404, 316L, S31603, SUS316L, X2CrNiMo17-12-2…)

Designation equivalences — 26 grades, to be verified before publication
EN numerical	EN symbolic	Common designation / ASTM	UNS	JIS	Family	Indicative PREN
1.4307	X2CrNi18-9	304L	S30403	SUS304L	Austénitiques	18–20 ¹
1.4404	X2CrNiMo17-12-2	316L	S31603	SUS316L	Austénitiques	24–26 ¹
1.4435	X2CrNiMo18-14-3	316L	S31603	SUS316L	Austénitiques	26–28 ¹
1.4571	X6CrNiMoTi17-12-2	316Ti	S31635	SUS316Ti	Austénitiques	24–26 ¹
1.4541	X6CrNiTi18-10	321	S32100	SUS321	Austénitiques	18–20 ¹
1.4462	X2CrNiMoN22-5-3	2205	S32205, S31803	SUS329J3L	Duplex & super duplex	34–36 ¹
1.4410	X2CrNiMoN25-7-4	2507	S32750	—	Duplex & super duplex	42–43 ¹
1.4539	X1NiCrMoCu25-20-5	904L	N08904	—	Super austénitiques	34–36 ¹
1.4547	X1CrNiMoCuN20-18-7	254 SMO	S31254	—	Super austénitiques	43–45 ¹
2.4856	NiCr22Mo9Nb	Alloy 625	N06625	—	Alliages nickel	50–54 ¹
3.7035	Ti2	Grade 2	R50400	—	Titane	does not apply to this family
CW352H	CuNi10Fe1Mn	90/10	C70600	—	Alliages de cuivre	does not apply to this family
CW354H	CuNi30Mn1Fe	70/30	C71500	—	Alliages de cuivre	does not apply to this family
1.4845	X8CrNi25-21	310S	S31008	SUS310S	Réfractaires	24–28 †
1.4835	X9CrNiSiNCe21-11-2	253 MA	S30815	—	Réfractaires	22–25 †
≈ 1.4438	X2CrNiMo18-15-4	TP317L	S31703	SUS317L	Austénitiques	28–33
no exact equivalent	—	TP347H	S34709	SUS347H	Nuances H et stabilisées	17–19 †
1.4162	X2CrMnNiN21-5-1	2101	S32101	—	Duplex & super duplex	24–29
1.4362	X2CrNiN23-4	2304	S32304	—	Duplex & super duplex	24–30
1.4016	X6Cr17	TP430	S43000	—	Ferritiques & martensitiques	16–18
1.4521	X2CrMoTi18-2	444 / 18Cr-2Mo	S44400	—	Ferritiques & martensitiques	23–28
2.4858	—	Alloy 825	N08825	—	Alliages nickel	28–35 †
2.4816	—	Alloy 600	N06600	—	Alliages nickel	14–17 †
1.4876	—	Alloy 800	N08800	—	Alliages nickel	19–23 †
2.4819	—	C-276	N10276	—	Alliages nickel	75 (PREW) †
3.7235	—	Ti Grade 7	R52400	—	Titane	does not apply to this family

≈ approximate equivalence, not an identity · italic: no exact equivalent, or not on record · † PREN calculable but not the deciding factor for this grade, see the caveat below · ¹ legacy value, not cross-checked against a product standard.

PREN caveats (†)

310S — réfractaire austénitique 25-20: ⚠️ PREN is NOT the relevant criterion for a heat-resistant grade. 310S is designed for hot oxidation resistance, not aqueous corrosion: without molybdenum, it isn't suited to chlorinated environments.
253 MA — réfractaire austénitique au silicium et cérium: ⚠️ As with 310S, PREN is not the relevant criterion for a heat-resistant grade: 253 MA is designed for hot oxidation resistance, not aqueous corrosion, and its pitting resistance in aqueous environments is lower than standard austenitics.
347H — austénitique stabilisé au niobium, tenue au fluage: ⚠️ PREN is not the deciding factor for this grade. 347H is chosen for creep resistance and stabilisation, not aqueous corrosion — its pitting resistance is at the level of a 304.
Alliage 825 — nickel-fer-chrome au molybdène, cuivre et titane: Indicative only. On an alloy with 38–46% nickel, performance isn't captured by PREN alone: nickel provides resistance to chloride stress corrosion cracking, and the molybdenum-copper pair provides resistance in reducing environments.
Alliage 600 — nickel-chrome à 72 % de nickel minimum: ⚠️ A misleading indicator on this alloy. A PREN of 15 is lower than a 304L's, yet Alloy 600's performance comes from its 72% nickel content: resistance to chloride stress corrosion cracking, high-purity water and caustic environments.
Alliage 800 — nickel-fer-chrome pour service à chaud: ⚠️ Not relevant: Alloy 800 is chosen for hot oxidation, carburisation and nitriding resistance, not aqueous corrosion.
C-276 — nickel-chrome-molybdène au tungstène: Tungsten requires the PREW formula, not PREN₁₆. For reference: 2507 at 42–43, 254 SMO at 43–45.

PREN notes

317L — austénitique à haute teneur en molybdène: Notably higher than 316L (24–26) thanks to molybdenum raised to 3–4%. That's the reason this grade exists.
2101 — duplex lean, faible teneur en nickel: Comparable to a 316L, with nickel reduced to 1.35–1.70% versus 10–14%. That's the whole logic of lean duplex: performance comes from nitrogen and manganese, not nickel.
2304 — duplex sans molybdène: Equivalent to 2101 in PREN, but via a different route: 2304 relies on chromium at 21.5–24.5% where 2101 relies on nitrogen and manganese.
430 — ferritique au chrome, sans nickel: Lower than 304L. 430 is not a corrosion-resistant grade for aggressive environments.
444 — ferritique au molybdène, stabilisé: Comparable to 316L, without a single gram of nickel. That's the whole logic of this grade.

These 26 grades are an excerpt, not a closed catalogue. My grade isn't listed →

How it works

The search field compares your input, normalised (case, spaces and dots ignored), against the five designation columns of each row. The full table stays in the page's HTML: the search filters rows already present, it does not load them from a server.

Limits of this table

Frequently asked questions

What does the designation 1.4404 mean?: It is the EN numerical designation (EN 10027-2 standard) for 316L. Every grade standardised in Europe carries a four-digit EN number after the 1. prefix (steels) or an alloy prefix for nickel and copper alloys.
Are the equivalences in this table 100% exact?: No: these are common equivalences, not identities. Two designations considered equivalent can have slightly different composition ranges — see the Limits section below.
Why do some JIS or UNS cells show a dash?: Some grades have no official designation in that reference system — this is the case for several special alloys in JIS, for example. A dash signals a real absence, never an unfilled value.
Can I search with or without dots and spaces?: "1.4404", "1 4404" and "14404" all return the same result. The search also ignores case — "sus316l" works as well as "SUS316L".
My grade is not in this table, what should I do?: This table covers 26 grades, not a closed catalogue — new entries are added as sessions progress. In the meantime, send us your designation directly through a quote request.