Below is the data categorized by “standard types,” as follows:
| Type | Cr | Ni | Cmax | Other Elements | Major Characteristics |
| 303 | 17.00-19.00 | 8.00-10.00 | 0.15 | S 0.15 min | Free-machining modification of Type 302 |
| 303 Se | 17.00-19.00 | 8.00-10.00 | 0.15 | Se 0.15 min | Free-machining version of Type 302. Produces better surface finish than Type 303. |
| 304 | 18.00-20.00 | 8.00-10.00 | 0.08 | – | Low carbon variation of Type 302. Minimizes carbide precipitation during welding |
| 304L | 18.00-20.00 | 8.00-10.00 | 0.03 | – | Extra-low carbon content eliminates harmful carbide precipitation due to welding |
| 309 | 22.00-24.00 | 12.00-15.00 | 0.2 | – | High strength and resistance to scaling at high temperatures |
| 310 | 24.00-26.00 | 19.00-22.00 | 0.2 | – | Higher alloy content improves basic characteristics of Type 309 |
| 316 | 16.00-18.00 | 10.00-14.00 | 0.08 | Mo 2.00-3.00 | Mo improves general corrosion and pitting resistance and high temperature strength over that of Type 302 |
| 316L | 16.00-18.00 | 10.00-14.00 | 0.2 | Mo 2.00-3.00 | Extra-low carbon version of Type 316. Eliminates harmful carbide precipitation due to welding |
| 317 | 18.00-20.00 | 11.00-15.00 | 0.08 | Mo 3.00-4.00 | Higher alloy content improves basic advantages of Type 316 |
| 321 | 17.00-19.00 | 9.00-12.00 | 0.08 | Ti 5 x C. min | Stabilized to permit use in 800-1500°F temperature range without harmful carbide precipitation |
| 347 | 17.00-19.00 | 9.00-13.00 | 0.008 | Cb + Ta 10 x C. min | Characteristics similar to Type 321. Stabilized by Cb and Ta. |
| 348 | 17.00-19.00 | 9.00-13.00 | 0.08 | Ta 0.10 max Cb 0.20 max Cb + Ta 10 x C min | Similar to Type 347 but Ta reduced for atomic energy applications |
| 410 | 11.50-13.50 | - | 0.15 | - | Lowest cost general purpose stainless steel. Wide use where corrosion is not severe |
| 416 | 12.00-14.00 | - | 0.15 | S 0.15 min | Free-machining version of Type 410. |
| 420 | 12.00-14.00 | - | 0.15 min | - | Similar variation of Type 410 but higher carbon produces higher strength and hardness. |
| 430 | 14.00-18.00 | - | 0.12 | - | Most popular of the chromium types. Combines good corrosion and heat resistance and mechanical properties. |
| 430 F | 14.00-18.00 | - | 0.12 | S 0.15 min | Free-machining version of Type 430 |
| 440A | 16.00-18.00 | - | 0.60-0.75 | - | Series of high carbon types. Some basic composition with varying carbon content. Higher carbon produces higher strength and hardness but lower toughness. All Type 440 versions are corrosion resistant only in the hardened condition |
| 440B | 16.00-18.00 | 0.75-0.95 | |||
| 440C | 16.00-18.00 | 0.95-1.20 | |||
| 446 | 23.00-27.00 | - | 0.2 | - | Similar to Type 442 but Cr increased to provide maximum resistance to scaling |
| 15-5 PH | 14.00-15.50 | 3.50-5.50 | 0.07 | Cu 2.50-4.50 | Similar in properties and characteristics to 17-4 PH but has superior transverse ductility and toughness |
| PH 15-7 Mo | 14.00-16.00 | 6.50-7.75 | 0.09 | Mo 2.00-3.00 | Special type similar to 17-7 PH but with higher strength |
| Al 0.75-1.50 | |||||
| 17-4 PH | 15.50-17.50 | 3.00-5.00 | 0.07 | Cu 3.00-5.00 | Special type that combines excellent corrosion resistance…high strength and hardness… low temperature hardening and good fabrication characteristics |
| 17-7 PH | 16.00-18.00 | 6.50-7.75 | 0.09 | AL 0.75-1.25 | Special ultra-high strength type with good formability and excellent fabricating characteristics |
Introduction to the Chemical Composition of Several Common Stainless Steels
304 Stainless Steel
304 stainless steel is a widely used austenitic stainless steel, known for its excellent corrosion resistance, workability, and weldability.
316L Stainless Steel
It is a derivative of the 18-8 austenitic stainless steel, with the addition of 2-3% molybdenum (Mo), which provides excellent corrosion resistance, especially widely used in the chemical industry.
316 Stainless Steel
The addition of molybdenum enhances its corrosion resistance, particularly against corrosion from chlorides.
Austenitic Stainless Steel
In addition to 304 and 316, there are other austenitic stainless steels, such as 317L, which increases the content of molybdenum and nickel based on 316 to enhance its corrosion resistance
Ferritic Stainless Steel
Such as type 430, with a chromium content of about 12%, it has magnetic properties but relatively poor corrosion resistance.
Duplex Stainless Steel
Such as type 2205, with a chromium content of over 18%, a nickel content of around 8%, and a molybdenum content of about 3%, it possesses good strength and corrosion resistance.
Martensitic Stainless Steel
Different types of stainless steel materials have different chemical compositions, which directly affect their performance and applications. When selecting stainless steel materials, it is necessary to choose the appropriate type based on the specific usage environment and requirements.
Contact Us
If you are looking for relevant stainless steel products for your project, you can contact us, and we can provide you with samples for testing.
We will reply to your email within 24 hours!
