Stainless Steel Tool
Grade Equivalent Lookup
Search a common stainless steel grade name and compare ASTM / AISI, UNS, EN and JIS wording in one place.
Enter 304, SUS304, 1.4301 or S30400 to find the same grade family.
Reference Table
Common stainless steel grade equivalents
Use the table for quick review, then confirm the exact standard and certificate wording before release.
Austenitic stainless steel
| Common Grade | ASTM / AISI | UNS | EN | JIS |
|---|---|---|---|---|
| 201 | AISI 201 | S20100 | 1.4372 | SUS201 |
| 202 | AISI 202 | S20200 | 1.4373 | SUS202 |
| 301 | AISI 301 | S30100 | 1.4310 | SUS301 |
| 303 | AISI 303 | S30300 | 1.4305 | SUS303 |
| 304 | AISI 304 | S30400 | 1.4301 | SUS304 |
| 304L | AISI 304L | S30403 | 1.4307 | SUS304L |
| 309 | AISI 309 | S30900 | 1.4828 | — |
| 309S | AISI 309S | S30908 | 1.4833 | SUS309S |
| 310 | AISI 310 | S31000 | 1.4841 | — |
| 310S | AISI 310S | S31008 | 1.4845 | SUS310S |
| 316 | AISI 316 | S31600 | 1.4401 | SUS316 |
| 316L | AISI 316L | S31603 | 1.4404 | SUS316L |
| 321 | AISI 321 | S32100 | 1.4541 | SUS321 |
| 347 | AISI 347 | S34700 | 1.4550 | SUS347 |
Ferritic stainless steel
| Common Grade | ASTM / AISI | UNS | EN | JIS |
|---|---|---|---|---|
| 409 | AISI 409 | S40900 | 1.4512 | SUS409L |
| 410S | AISI 410S | S41008 | 1.4000 | SUS410S |
| 430 | AISI 430 | S43000 | 1.4016 | SUS430 |
| 439 | AISI 439 | S43035 | 1.4510 | — |
| 441 | AISI 441 | S44100 | 1.4509 | — |
Martensitic stainless steel
| Common Grade | ASTM / AISI | UNS | EN | JIS |
|---|---|---|---|---|
| 410 | AISI 410 | S41000 | 1.4006 | SUS410 |
| 420 | AISI 420 | S42000 | 1.4021 | SUS420J1 |
| 431 | AISI 431 | S43100 | 1.4057 | SUS431 |
| 440A | AISI 440A | S44002 | 1.4109 | SUS440A |
| 440B | AISI 440B | S44003 | 1.4112 | SUS440B |
| 440C | AISI 440C | S44004 | 1.4125 | SUS440C |
Duplex and high-alloy stainless steel
| Common Grade | ASTM / AISI | UNS | EN | JIS |
|---|---|---|---|---|
| 2205 | 2205 Duplex | S32205 / S31803 | 1.4462 | SUS329J3L |
| 2507 | 2507 Super Duplex | S32750 | 1.4410 | — |
| 904L | 904L | N08904 | 1.4539 | — |
FAQ
Stainless steel grade equivalent FAQ
Is SUS304 the same as 304 stainless steel?
SUS304 is the JIS naming commonly used for the same 304 grade family. Final orders should still follow the required standard and MTC.
Is 1.4301 the same as 304?
1.4301 is the EN grade number commonly associated with 304 stainless steel.
Can I use an equivalent grade name directly on a purchase order?
Use the exact standard and grade required by the drawing or project document. Equivalent names are helpful for review, not a replacement for order control.
Why do some rows show a dash under JIS?
Some grades do not have a simple one-to-one JIS naming path in common buyer use. Confirm the required standard before release.
Related Pages
Continue with the right grade reference
303 Stainless Steel Bar
Review machinability-focused 303 bar and SUS303 buyer language.
304/304L Stainless Steel Bar
Review general-purpose 304 and 304L bar supply language.
316/316L Stainless Steel Bar
Review corrosion-focused 316 and 316L bar supply language.
How to Read a Stainless Steel MTC
Check how grade names, heat numbers and chemistry should align in the mill certificate.
303 vs 304 Stainless Steel Bar
Compare machinability, corrosion tradeoff and buyer-fit language for CNC jobs.
If you need another grade family or think an equivalent should be reviewed, please tell us at [email protected].
Need help confirming a grade before quotation?
Send the grade name, drawing, standard wording and application. We can help review the practical supply path before release.
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