Stainless Steels
Surface treatment and maintenance are required to protect iron from its tendency to rust. From the need to prevent this loss to rust came the developments of rust-free steel and stainless steel. To prevent rust, at least 10.5 percent chromium is used to form a fine oxidation (passive) film on the surface of the steel. Nippon Yakin produces a variety of stainless steel products superior to conventional stainless steel. Features of these products include resistance to heat, grain boundary corrosion, stress corrosion cracking and weather as well as being highly formable, machinable, and strong with or without being magnetizable.
| Nippon Yakin Grade | UNS | ASME | ASTM | DIN | EN |
|---|---|---|---|---|---|
| NAS 301 | S30100 | ― | A240 | ― | ― |
| NAS 304 | S30400 S30409 |
SA-240 | A240 | ― | EN10028-7 |
| NAS 305 | S30500 | ― | A240 | ― | ― |
| NAS 316 | S31600 S31609 |
SA-240 | A240 | ― | ― |
| NAS 317 | S31700 | ― | A240 | ― | ― |
| NAS 304AW | ― | ― | ― | ― | ― |
| NAS 301L | S30103 | ― | A240 | ― | ― |
| NAS 304L | S30403 | ― | A240 | ― | ― |
| NAS 347 | S34700 | SA-240 | A240 | ― | ― |
| NAS 316L | S31603 | SA-240 | A240 | DIN17440 DIN17441 |
EN10088-2 |
| NAS 317L | S31703 | SA-240 | A240 | ― | ― |
| NAS 86L | ― | ― | ― | ― | ― |
| NAS 125 | ― | ― | ― | ― | ― |
| NAS 144MLK | ― | ― | ― | ― | ― |
| NAS 304MK | ― | ― | ― | ― | ― |
| NAS 304DJ | ― | ― | ― | ― | ― |
| NAS 304SS | S30400 S30409 |
SA-240 | A240 | ― | EN10028-7 |
| NAS XM-7 | ― | ― | ― | ― | ― |
| NAS 303AM | S30300 | ― | A895 | ― | ― |
| NAS 301N | ― | ― | ― | ― | ― |
| NAS 304N2 | ― | ― | ― | ― | ― |
| NAS NM15 | ― | ― | ― | ― | ― |
| NAS 302B | S30215 | ― | A167 | ― | ― |
| NAS 309S | S30908 | SA-240 | A240 | ― | ― |
| NAS 310S | S31008 | SA-240 | A240 | ― | ― |