STAINLESS STEEL MAIN CATEGORIES
300 series austenitic - alloys: 301, 302, 303, 304, 305, 308, 309,
310, 314, 316, 321 stainless steel is made of stainless steel. Heat
treatment is not possible and they do not hold the magnet. They are
capable of taking shape. Stainless steel is the most common form of
stainless steel in the world. Austenitic structure approximately
8-10% is formed by adding a nickel. However, nickel alone does not
form austenitic structure.With the help of other elements such as
manganese, nitrogen, carbon and copper, austenitic properties are
created. Oxidation resistance increased with Molybdenum
supplementation. It is used in decoration,machine manufacturing,
white goods, chemical industry and sink manufacturing. Molybdenum
supplementation increases the corrosion resistance.
400 series ferritic - alloys: 405, 409, 429, 430, 434, 436, 442...
stainless steel in this series contains Chrome. As can be
magnetized, but are not subjected to heat treatment. Ferritic
stainless steels are generally nickel-free, containing high
chromium (between 12% and 30%), carbide-forming elements such as
molybdenum, titanium vanadium, and alloying elements that make
ferritic structure stable. In general, the high chromium content
provides ferritics with a very high corrosion resistance. Ferritic
stainless steels with mechanical and physical properties close to
the properties of carbon steels are magnetitic, unlike austenitic,
they can not be subjected to heat treatment due to their low carbon
content and can be easily rolled. Heat treatment is the process of
annealing that can be applied to these types of steels.They are not
as suitable for shaping as ostenitics.
| Notation | Symbol | Chemical Composition |
| C | Si | Mn | P | S | Ni | Cr | Others |
| 301 | STS301 | ≤0.15 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 6.00~8.00 | 16.00~18.00 | - |
| 301L | STS301L | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 6.00~8.00 | 16.00~18.00 | Less than 0.20 N |
| 304 | STS304 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 8.00~10.50 | 18.00~20.00 | - |
| 304L | STS304L | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 9.00~13.00 | 18.00~20.00 | - |
| 304J1 | STS304J1 | ≤0.08 | ≤1.70 | ≤3.00 | ≤0.045 | ≤0.030 | 6.00~9.00 | 15.00~18.00 | Cu 1.00~3.00 |
| 305 | STS305 | ≤0.12 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 10.50~13.00 | 17.00~19.00 | - |
| 316 | STS316 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 10.00~14.00 | 16.00~18.00 | Mo 2.00~3.00 |
| 316L | STS316L | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 12.00~15.00 | 16.00~18.00 | Mo 2.00~3.00 |
| 321 | STS321 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 9.00~13.00 | 17.00~19.00 | More than 5×C% Ti |
