Designation of Stainless Steels
Designation of stainless steels
| Structure | Hardenable | Group | AISI Type | Analyses Built Up From Basic Types |
|---|---|---|---|---|
| Austenitic | Hardenable by Cold Work | Chromium-Nickel Manganese | 201 | Cr and Ni lower for more work hardening |
| 202 | Basic Type ó Cr 18% ó Ni 5% ó Mn 8% | |||
| 204 | C lower to avoid carbide precipitation | |||
| 204L | C lower for welding application | |||
| Austenitic | Hardenable by Cold Work | Chromium-Nickel | 301 | Cr and Ni lower for more work hardening |
| 302 | Basic Type ó Cr 18% ó Ni 8% | |||
| 302B | Si higher for more scaling resistance | |||
| 303 | S or Se added for easier machining | |||
| 304 | C lower to avoid carbide precipitation | |||
| 304L | C lower for welding application | |||
| 305 | Ni higher for less work hardening | |||
| 308 | Cr and Ni higher with C low for more corrosion and scaling resistance | |||
| 309 | Cr and Ni still higher for more corrosion and scaling resistance | |||
| 309C | Cb, Ta added to avoid carbide precipitation | |||
| 309S | C lower to avoid carbide precipitation | |||
| 310 | Cr and Ni highest to increase scaling resistance | |||
| 314 | Si higher to increase scaling resistance | |||
| 316 | Mo added for more corrosion resistance | |||
| 316L | C lower for welding application | |||
| 317 | Mo higher for more corrosion resistance and strength at heat | |||
| 318 | Cb, Ta added to avoid carbide precipitation | |||
| 321 | Ti added to avoid carbide precipitation | |||
| 347 | Cb, Ta added to avoid carbide precipitation | |||
| 347F or Se | S or Se added to improve machinability | |||
| 348 | Similar to 347, but low tantalum content (.10) | |||
| Martensitic | Hardenable by Heat Treatment | Chromium-Iron | 403 | Cr 12% adjusted for special physicals |
| 410 | Basic Type - Cr 12% | |||
| 414 | Ni added to increase corrosion resistance and physicals | |||
| 416 | S or Se added for easier machining | |||
| 418 Spec | W added to improve high temperature properties | |||
| 420 | C higher for cutting purposes | |||
| 420F or Se | S or Se added for easier machining | |||
| 431 | Cr higher and Ni added for better resistance and properties | |||
| 440A | C higher for cutting applications | |||
| 440B | C higher for cutting applications | |||
| 440C | C still higher for wear resistance | |||
| 440F or Se | S or Se added for easier machining | |||
| Ferritic | Non-hardenable | Chromium-Iron | 405 | Al added to Cr l2% prevent hardening |
| 430 | Basic Type ó Cr 17% | |||
| 430F or So | S or Se added for easier machining | |||
| 430Ti | Titanium stabilized | |||
| 442 | Cr higher to increase scaling resistance | |||
| 446 | Cr much higher for improved scaling resistance |
| Alloy Abreviations | ||
|---|---|---|
| Carbon . . . . . . . . . . C | Molybdenum . . . . . . Mo | Sulfur . . . . . . . . . . . S |
| Nickel . . . . . . . . . . Ni | Chromium . . . . . . . . . Cr | Titanium . . . . . . . . . Ti |
| Columbium . . . . . . Cb | Phosphorous . . . . . . . . P | Tantalum . . . . . . . . Ta |
| Manganese . . . . . . Mn | Selenium . . . . . . . . . . Se | Tungsten . . . . . . . . W |
| Silicon . . . . . . . . . . Si | ||
The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes.
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