This specification covers seamless stainless tubing for use in mechanical applications where corrosion-resistant or high-temperature strength is needed.This specification covers seamless cold-finished mechanical tubing and seamless hot-finished mechanical tubing in sizes up to 123⁄4 in. [325 mm] in outside nominal diameter (for round tubing) with wall thicknesses as required.Tubes shall be furnished in one of the following shapes, as specified by the purchaser: round, square, rectangular, or special.
| Material | Grades |
|---|---|
| Austenitic Stainless Steels | MT 302 |
| MT 303 | |
| MT 303Se | |
| MT 304 | |
| MT 304L | |
| MT 305 | |
| MT 309S | |
| MT 310S | |
| MT 316 | |
| MT 316L | |
| MT 317 | |
| MT 321 | |
| MT 347 | |
| Martensitic Stainless Steels | MT 403 |
| MT 410 | |
| MT 414 | |
| MT 416Se | |
| MT 440 | |
| Ferritic Stainless Steels | |
| MT 405 | |
| MT 429 | |
| MT 430 | |
| MT 443 | |
| MT 446 - 1 | |
| MT 446 - 2 | |
| 29 - 4 | |
| 29 - 4 - 2 | |
| Austenitic-Ferritic Stainless Steels | |
| UNS S31260 | |
| UNS S31803 | |
| UNS S32101 | |
| UNS S32205 | |
| UNS S32304 | |
| UNS S32506 | |
| UNS S32550 | |
| UNS S32707 | |
| UNS S32750 | |
| UNS S32760 | |
| UNS S32906 | |
| UNS S32808 | |
| UNS S32950 | |
| UNS S39274 |