Stainless Steel Explained
Stainless steel is a type of steel that contains chromium, which gives it corrosion resistance and durability. There are many grades of stainless steel, each with different chemical compositions and properties. Some of the most common grades are classified by the American Iron and Steel Institute (AISI) using a three-digit number, such as 304, 316, or 430. However, there are also other standards for stainless steel in different regions and countries, such as the European Union (EN), Germany (DIN), United Kingdom (BS), Italy (UNI), and Japan (JIS). Therefore, it is useful to have a table of equivalent grades of stainless steel that can compare the grades from different standards and show their similarities and differences.
A table of equivalent grades of stainless steel can help users to select the appropriate grade for their applications and to understand the properties and performance of different grades. Such a table can also help users to find alternative grades in case of unavailability or cost issues. A table of equivalent grades of stainless steel can be based on various criteria, such as chemical composition, mechanical properties, corrosion resistance, heat resistance, or weldability. However, it is important to note that not all grades have exact equivalents in other standards, and some grades may have slight variations in actual chemistry or characteristics. Therefore, users should always verify the suitability of the selected grade for their specific requirements and conditions.
Here is a handy table showing how the same grades of stainless steel are classified by different regions, countries and institutions.
This includes the American Iron and Steel Institute (AISI), the European Union (EN), Germany (DIN), the United Kingdom (BS), Italy (UNI) and Japan (JIS).
| EN (10088) | Common Names | BS (Wrought) | AISI | UNS | En | German | SS | EN (10283) | BS (Cast) | Composition Guide | ||||
| C | Cr | Ni | Mo | Others | ||||||||||
| 1.4301 | A2 | 304S31 | 304 | S30400 | 58E | X5CrNi18-10 | 2333 | 1.4308 | 304C15 | 0.07x | 18 | 8 | – | – |
| 1.4303 | – | 305S19 | 305 | S30500 | – | X5CrNi18-12 | – | – | – | 0.06x | 18 | 11 | – | – |
| 1.4305 | A1 | 303S31 | 303 | S30300 | 58M | X10CrNiS18-9 | 2346 | – | – | 0.10x | 18 | 8 | – | 0.35xS |
| 1.4306 | A2 | – | 304L | – | – | X2CrNi19-11 | 2352 | – | – | 0.030x | 18 | 10 | – | – |
| 1.4307 | A2 | 304S11 | 304L | S30403 | – | – | 2352 | – | 304C12 | 0.030x | 18 | 8 | – | – |
| 1.431 | – | 301S21 | 301 | S30100 | – | X12CrNi17-7 | 2331 | – | – | .05/.15 | 17 | 6 | – | – |
| 1.4311 | A2 | 304S61 | 304LN | S30453 | – | X2CrNiN18-10 | 2371 | 1.4309 | – | 0.030x | 18 | 9 | – | 0.22xN |
| 1.4372 | – | – | 201 | S20100 | – | – | – | – | – | 0.15x | 17 | 4.5 | – | 6.5Mn |
| 1.4401 | A4 | 316S31 | 316 | S31600 | 58J | X5CrNiMo17-12-2 | 2347 | 1.4408 | 316C16 | 0.07x | 17 | 11 | 2 | – |
| 1.4404 | A4 | 316S11 | 316L | S31603 | – | X2CrNiMo17-13-2 | 2348 | 1.4409 | 316C12 | 0.030x | 17 | 11 | 2 | – |
| 1.4406 | A4 | 316S61 | 316LN | S31653 | – | X2CrNiMoN17-12-2 | – | – | – | 0.030x | 17 | 11 | 2 | 0.22xN |
| 1.4432 | A4 | 316S13 | 316L | – | – | – | 2353 | – | – | 0.030x | 17 | 11 | 2.5 | – |
| 1.4435 | A4 | 316S13 | 316L | – | – | XCrNiMo18-14-3 | 2353 | – | – | 0.030x | 17 | 13 | 2.5 | – |
| 1.4436 | A4 | 316S33 | 316 | – | 58J | X5CrNiMo17-13-3 | 2343 | – | – | 0.05 | 17 | 11 | 2.5 | – |
| 1.4438 | – | 317S12 | 317L | S31703 | – | – | 2367 | – | – | 0.030x | 18 | 13 | 3 | – |
| 1.4439 | – | – | – | – | – | X2CrNiMoN17-13-5 | – | 1.4446 | – | 0.030x | 17 | 13 | 4 | 0.22xN |
| 1.4541 | A5 | 321S31 | 321 | S32100 | 58B | X6CrNiTi18-10 | 2337 | – | – | 0.08x | 18 | 9 | – | 0.5Ti |
| 1.455 | – | 347S31 | 347 | S34700 | 58F | X6CrNiNb18-10 | 2338 | 1.4552 | 347C17 | 0.08x | 18 | 9 | – | 0.5Nb |
| 1.4563 | Sanicro28/Alloy28 | – | – | N08028 | – | X1NiCrMoCu31-27-4 | 2584 | – | – | 0.02x | 26 | 30 | 3 | 1.0Cu |
| 1.4567 | – | 394S17 | 304Cu | S30430 | – | – | – | – | – | 0.04x | 18 | 9 | – | 4xCu |
| 1.4571 | A5 | 320S31 | (316Ti) | S31635 | – | X6CrNoMoTi17-12-2 | 2350 | 1.4581 | – | 0.08x | 17 | 11 | 2 | 0.5Ti |
| 1.4539 | 904L | 904S13 | – | N08904 | – | X1CrNiMoCuN25-20-5 | 2562 | 1.4584 | – | 0.020x | 19 | 24 | 4 | 1.5Cu |
| 1.4547 | 254SMO/F44 | – | – | S31254 | – | – | 2378 | 1.4593 | – | 0.020x | 20 | 18 | 6 | 0.75Cu |
| 1.4529 | A8 | – | – | N08925 | – | X1NiCrMoCuN25-20-6 | – | 1.4588 | – | 0.020x | 19 | 24 | 6 | 1.25Cu |
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