Chemical and Mechanical Properties of 304 Stainless Steel
Grade 304 typically contains around 18-20% chromium and 8-10.5% nickel, which provides good resistance to rust and environmental wear, as well as excellent strength. This chemical composition ensures good weldability and formability, making it versatile.
If mechanical properties are considered, it has good tensile strength. Its high formability means you can easily shape it to meet specific requirements. Furthermore, its durability adds to its versatility.
The casting equivalent for Type 304 stainless steel is CF8 (ASTM A351/ A743/ A744 Grade CF8), which retains the essential properties of 304, including its corrosion resistance and mechanical performance.
Type 304L Stainless Steel
Type 304L is a low-carbon version of 304, which offers significantly improved weldability due to its lower carbon content. The lower carbon content helps to reduce the risk of carbide precipitation during welding processes. The casting equivalent for 304L is CF3 (ASTM A351/A743/A744 Grade CF3).
Common Applications for 304 Stainless Steel
Its good resistance to corrosion and ease of fabrication make it a staple in food processing, brewing, and dairy industries because of compliance with FDA regulations. Additionally, it is widely used for kitchen utensils, sinks, silverware and other food-contact surfaces. Its hygienic properties make it ideal for environments requiring cleanliness. It is also a popular choice for architectural projects due to its aesthetic appeal. It is used widely in the valve and fitting industry for instance we make some of our stainless steel solenoid valves out of this same 304 Stainless Steel.
Stainless Steel 316/316L
316 stainless steel is superior to 304 when it comes to resisting chloride corrosion, making it the go-to material for applications where corrosion resistance is needed. We use 316 to cast many of our ball valves and even some butterfly valves, solenoid valves and fittings.
Chemical Composition of 316 Stainless Steel
In addition to chromium and nickel, 316 stainless steel contains 2-3% of molybdenum (2-3%), which significantly enhances its corrosion resistance. The presence of molybdenum also contributes to the overall strength and durability.
Corrosion Resistance and Durability
316 stainless steel has superior resistance to pitting and crevice corrosion, especially in saltwater environments. Its robust passive oxide layer provides long-term protection against aggressive chemicals such as chlorine. That is why it is preferred in harsh applications.
The casting equivalent for Type 316 stainless steel is CF8M (ASTM A351/ A743 /A744 Grade CF8M.
Type 316L Stainless Steel
Similar to 304/304L the type 316L is the low-carbon version of 316. And, in a similar way to 304L, it improves its weldability by reducing the risk of carbon precipitation. The casting equivalent for 316L is CF3M (ASTM A351/A743/A744 Grade CF3M).
Typical Applications of 316 Stainless Steel
316 or CF8M and CF3M are ideal for marine fittings, chemical processing, and pharmaceutical manufacturing, where chemical exposure is high.
Magnetic Characteristics of 304 and 316 Stainless Steel
Now let's talk about a misconception of the magnetic nature of stainless steel that most people confuse. The austenitic stainless steel (316) is not magnetic because of its nickel content. However stainless steel 304 may be slightly magnetic in areas that have been deformed, such as by bending. For easy understanding, you can think of it as having paramagnetic characteristics, meaning that small particles in the 304 type can be attracted to powerful magnetic separators.
