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 | Major Applications |
|---|---|---|
| NAS 301 | S30100 | A material with lower chromium and nickel than SUS 304 for superior work hardening. Coil springs, bolts, nuts |
| NAS 304 | S30400 S30409 |
A general-use stainless steel. Provides an excellent balance of properties while being easy to use. Food equipment, general chemicals, daily goods |
| NAS 305 | S30500 | Provides lower work hardening than SUS 304. Spinning, cold forging |
| NAS 316 | S31600 S31609 |
A form of SUS 304 with molybdenum added for superior pitting corrosion resistance and little magnetism after working. |
| NAS 317 | S31700 | A material with pitting corrosion resistance enhanced over SUS 316. Outer plates for equipment |
| NAS 304AW | ― | A form of SUS 304 with nitrogen added for strength while maintaining a high level of extendibility. Strong structural members |
| NAS 301L | S30103 | A low-carbon form of SUS 301 with grain boundary corrosion resistance and superior weldability. Railroad cars |
| NAS 304L | S30403 | A material with less carbon and more nickel than SUS 304. Resistant to rust and providing excellent grain boundary corrosion resistance. Parts that cannot be heat treated after welding |
| NAS 347 | S34700 | Containing neodymium, this provides a high level of resistance to grain boundary corrosion. |
| NAS 316L | S31603 | A form of SUS 316 steel with an extremely low level of carbon to provide a high level of grain boundary resistance. |
| NAS 317L | S31703 | A form of SUS 317 with a low level of carbon to provide a high level of grain boundary resistance. |
| NAS 86L | ― | A low-carbon form of SUS 305 with low work hardening. Applications similar to SUS 305 |
| NAS 125 | ― | A steel material containing silicon and copper for improved resistance to stress corrosion cracking. With a level of gap corrosion resistance equivalent to SUS 316, excellent for preventing corrosion on welded parts |
| NAS 144MLK | ― | A chlorine-resistant material. Main uses include harsh environments that SUS 316L and 317L cannot withstand |
| NAS 304MK | ― | A form of SUS 304 with added copper for excellent cold workability and non-magnetism. Bolts, nuts |
| NAS 304DJ | ― | An SUS 304 base with lower nickel and higher copper for cold formability and particularly favorable deep drawing. Sinks, warm water tanks |
| NAS 304SS | S30400 S30409 |
For deep drawing and stretch forming |
| NAS XM-7 | ― | SUS 304 with copper added to improve the cold workability. Implements,cold forging products |
| NAS 303AM | S30300 | A highly machinable stainless steel with improved cuttability and burning resistance, though less resistant to corrosion. Bolts, nuts |
| NAS 301N | ― | Stainless steel made from SUS 301 with nitrogen added for strength. Coil springs, bolts, nuts |
| NAS 304N2 | ― | A metal made from SUS 304 with nitrogen and neodymium added for strength while maintaining a high level of extendibility. Applications similar to 304N1 |
| NAS NM15 | ― | Non-magnetic with a high level of strength |
| NAS 302B | S30215 | Providing corrosion and heat resistance superior to SUS 304. For applications requiring resistance to heat. |
| NAS 309S | S30908 | A stainless steel providing superior resistance to heat and corrosion over SUS 304. For applications requiring resistance to heat. |
| NAS 310S | S31008 | Providing superior corrosion and heat resistance to SUS 309S. For uses requiring resistance to heat. |