This specification covers a number of grades of nominal-wall-thickness, stainless steel tubing for general corrosion-resisting and high-temperature service. Most of these grades are commonly known as the “straight-chromium” types and are characterized by being ferromagnetic. These features should be recognized in the use of these materials. Grade TP439 is used primarily for hot-water tank service and does not require post-weld heat treatment to prevent attack of the heat affected zone. An optional supplementary requirement is provided, and when desired, shall be so stated in the order.
| Grades | UNS Designation |
|---|---|
| TP405 | S40500 |
| TP410 | S41000 |
| TP429 | S42900 |
| TP430 | S43000 |
| TP443 | S44300 |
| TP446 - 1 | S44600 |
| TP446 - 2 | |
| - | S40800 |
| TP409 | S40900 |
| TP439 | S43035 |
| - | S43932 |
| - | S41500 |
| TP430 Ti | S43036 |
| TP XM - 27 | S44627 |
| TP XM - 33 | S44626 |
| 18 Cr - 2Mo | S44400 |
| 29 - 4 | S44700 |
| 29 - 4 - 2 | S44800 |
| 26 - 3 - 3 | S44600 |
| 25 - 4 - 4 | S44635 |
| - | S44735 |
| - | S32803 |
| - | S40977 |
| - | S43940 |
| - | S42035 |
| TP468 | S46800 |