Standards · ASME and ASTM · ASTM A182/A182M
ASTM A182/A182M: Forged or rolled alloy and stainless steel pipe flanges, forged fittings, valves and parts
The forging standard for everything that is not plain carbon steel: low-alloy heat-resistant steels (F1, F11, F22, F91), austenitic stainless steels (F304/L, F316/L, F321, F347) and duplex (F51, F53) for flanges, forged fittings and valve parts up to 4540 kg.
- Issued by
- ASTM
- Edition (publisher, as of 2 October 2026)
- 2026a
- Material specification
- Forged or rolled alloy and stainless steel pipe flanges, forged fittings, valves and parts
- European counterpart
- EN 10222-2 / EN 10222-5
- Belongs with
- ASME B16.5 · ASTM A403/A403M · ASTM A105/A105M · ASME B36.19M
- At Zickwolff
- we carry – from stock or to order, lead time on request
Scope: sizes, classes, grades
Grades with the prefix F: ferritic-alloy F1, F5, F9, F11 (Class 2 usual), F12, F22 (Class 3 usual), F91 – austenitic F304, F304L, F304H, F316, F316L, F316H, F316Ti, F321, F347 – duplex F51 (2205), F53 and F55 (superduplex), F44 (6Mo). Typical strength austenitic: F316 515/205 MPa, F316L 485/170 MPa, elongation 30 %. Use range F304/F316 about −268 °C to 537 °C, duplex not above about 300 °C.
Product form
Forgings and rolled bar – flanges, forged fittings, valve bodies and trim.
Grades and their European counterparts
Show full table · more than 10 rows
| Grade | Type | Tensile / yield min. (MPa) | European counterpart | Limits of the comparison | At Zickwolff |
|---|---|---|---|---|---|
| F1 | alloy steel | not stated in our sources | 16Mo3 1.5415 · EN 10222-2 | comparable by strength, not identical in analysis | on request |
| F11 Cl. 2 | alloy steel | not stated in our sources | 13CrMo4-5 1.7335 · EN 10222-2 | comparable by strength, not identical in analysis | deliverable |
| F12 Cl. 2 | alloy steel | not stated in our sources | 13CrMo4-5 1.7335 · EN 10222-2 | comparable by strength, not identical in analysis | on request |
| F22 Cl. 3 | alloy steel | not stated in our sources | 10CrMo9-10 / 11CrMo9-10 1.7380 / 1.7383 · EN 10222-2 | comparable by strength, not identical in analysis | on request |
| F5 | alloy steel | not stated in our sources | X11CrMo5 1.7362 · EN 10222-2 | comparable by strength, not identical in analysis | on request |
| F9 | alloy steel | not stated in our sources | not stated in our sources | no common EN grade – compare by analysis and certificate | on request |
| F91 | alloy steel | not stated in our sources | X10CrMoVNb9-1 1.4903 · EN 10222-2 | comparable by strength, not identical in analysis | on request |
| F304 | austenitic stainless | 515 / 205 | X5CrNi18-10 1.4301 · EN 10222-5 | same alloy type, carbon and molybdenum bands differ – dual certification possible | on request |
| F304L | austenitic stainless | 485 / 170 | X2CrNi18-9 / X2CrNi19-11 1.4307 / 1.4306 · EN 10222-5 | same alloy type, carbon and molybdenum bands differ – dual certification possible | deliverable |
| F316 | austenitic stainless | 515 / 205 | X5CrNiMo17-12-2 / X3CrNiMo17-13-3 1.4401 / 1.4436 · EN 10222-5 | same alloy type, carbon and molybdenum bands differ – dual certification possible | on request |
| F316L | austenitic stainless | 485 / 170 | X2CrNiMo17-12-2 / X2CrNiMo18-14-3 1.4404 / 1.4435 · EN 10222-5 | same alloy type, carbon and molybdenum bands differ – dual certification possible | deliverable |
| F316Ti | austenitic stainless | not stated in our sources | X6CrNiMoTi17-12-2 1.4571 · EN 10222-5 | same alloy type, carbon and molybdenum bands differ – dual certification possible | on request |
| F321 | austenitic stainless | not stated in our sources | X6CrNiTi18-10 1.4541 · EN 10222-5 | same alloy type, carbon and molybdenum bands differ – dual certification possible | on request |
| F347 | austenitic stainless | not stated in our sources | X6CrNiNb18-10 1.4550 · EN 10222-5 | same alloy type, carbon and molybdenum bands differ – dual certification possible | on request |
| F51 | duplex | 620 / 450 | X2CrNiMoN22-5-3 1.4462 · EN 10222-5 | same alloy type, carbon and molybdenum bands differ – dual certification possible | on request |
| F53 | duplex | 770 / 550 | X2CrNiMoN25-7-4 1.4410 · EN 10222-5 | same alloy type, carbon and molybdenum bands differ – dual certification possible | on request |
Alloy grades correspond to EN 10222-2 (F1 – 16Mo3, F11/F12 – 13CrMo4-5, F22 – 10CrMo9-10/11CrMo9-10, F91 – X10CrMoVNb9-1), stainless grades to EN 10222-5 (F304 – 1.4301, F304L – 1.4307/1.4306, F316 – 1.4401/1.4436, F316L – 1.4404/1.4435, F316Ti – 1.4571, F321 – 1.4541, F347 – 1.4550, F51 – 1.4462, F53 – 1.4410).
Use in Europe: the Pressure Equipment Directive
Under the Pressure Equipment Directive an ASTM material has no presumption of conformity: it needs a European material approval or a particular material appraisal (PMA) by the equipment manufacturer, in categories III and IV assessed by the notified body. Comparisons with EN grades are orientation, never a one-to-one equivalence – chemistry bands, test scope and certificate differ. F316L is not simply 1.4404: depending on the analysis a heat may be certified as 1.4404, 1.4435 or 1.4436 – dual certification (F316/F316L, 1.4401/1.4404) is common and must be read on the certificate. F316Ti is rarely used in the US, where 316L replaces it.
Marking on the part
On the flange: manufacturer, NPS, Class, A182 or SA-182 with grade (F316L, F304/304L dual), heat code, B16.5.
The standard family: dimensions, material, pipe
ASME B16.5 · ASTM A403/A403M · ASTM A105/A105M · ASME B36.19M
At Zickwolff
Stainless flanges A182 F304L and F316L to B16.5 are part of our range, alloy grades F11/F22 and duplex F51 we procure – with certificate 3.1 and, where needed, dual certification to the EN material number.
Dimensions Dimension tables for this standard are on our page flange dimensions ASME B16.5. For the weld neck flange there is also a dimensional drawing with tolerances for each class and NPS: weld neck flange ASME B16.5.
Further reading
The profiles: ASME B16.5 · ASME B16.9 · ASME B16.25 · ASME B36.10M · ASME B36.19M · ASTM A105/A105M · ASTM A106/A106M · ASTM A234/A234M · ASTM A333/A333M · ASTM A350/A350M · ASTM A403/A403M · ASTM A420/A420M · ASME and ASTM standards.
From our pages: Flange dimensions ASME B16.5 Class 150/300 · DIN/EN or ASME for flanges · Standards guide · Materials · Pipe dimension tables · Rule of thumb: Class 150 is not 150 psi · Rule of thumb: schedule is not a wall thickness · Rule of thumb: DN is not a diameter.
Frequently asked questions about ASTM A182/A182M
Can I use this ASTM material in a pressure line under the PED?
Yes, but without presumption of conformity: the equipment manufacturer needs a European material approval or a particular material appraisal (PMA), in categories III and IV assessed by the notified body. For equipment under Article 4(3) (sound engineering practice) this does not apply. We supply the material with certificate 3.1 – the appraisal is the manufacturer's.
Must a plant with ASME parts be inspected more often?
No – the inspection interval comes from the operating law of the country, not from the code of the part. In Germany the Betriebssicherheitsverordnung (Annex 2 Section 4) sets maximum intervals, the operator fixes the interval in the risk assessment and the inspector may shorten it (TRBS 1201 Part 2) where design or manufacture give reason to. Operators often inspect more frequently anyway. This is general information, not legal advice – the legal text is binding.
F316L or 1.4404?
Same alloy type – a heat can be certified as F316L and 1.4404 at the same time if its analysis meets both – dual certification. Ask for it when the line is designed to EN.
What does F11 Class 2 mean?
The class sets the strength level of the alloy grade (F11 Class 1, 2, 3) – Class 2 is the usual one for flanges and corresponds in trade to 13CrMo4-5.
Parts to ASME and ASTM – from one source
Tell us standard, size (NPS and schedule or Class), material grade, certificate and quantity – we check what is in stock, what we procure and which European part would do the same job.
Send an inquiryYour inquiry to Zickwolff
Send us what you have – designation, standard, quantity, date. We will clarify the rest with you.
One item or a question
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Not in stock? We procure it – single items too.
Designation, standard and quantity are enough.
Several items
Send bill of materials
200 items? One parts list is enough – we deliver complete.
Attach it as a file.
Helpful if already known: project and country, date needed, certificates, packaging and language of the packing lists. If anything is missing, we will ask.
It is urgent
Request express
When do you need it? Express delivery, to the site if required.
Tell us by when you need the material – we will tell you what is possible.
Basis: the publicly accessible scopes and abstracts of ASME and ASTM (editions as of 2 October 2026), manufacturer catalogues, a trade reference catalogue DIN/EN/ASME and specialist sources for marking and impact test values – the legal statements follow Directive 2014/68/EU and the German Betriebssicherheitsverordnung. No standard text was reproduced – the current original edition is binding. Comparisons with EN grades are orientation, not equivalence. Information without guarantee, no legal advice, no prices.