1. Austenitic Stainless Steels (Series 300):

This class includes alloys containing nickel and chromium and offers excellent corrosion resistance. Examples of austenitic grades include 304 and 316 stainless steel.

• 304 Stainless Steel (AISI 304, SS 304): Commonly used for kitchenware, kitchen appliances, and decorative purposes.

• 316 Stainless Steel (AISI 316, SS 316): Preferred in shipbuilding and the chemical industry due to its resistance to seawater and chemicals.

2. Ferritic Stainless Steels (Series 400):

This class contains low carbon and high chromium content, providing corrosion resistance. For example, 430 stainless steel is used in kitchenware and automotive exhaust systems.

3. Martensitic Stainless Steels:
These are harder and stronger due to higher carbon content. They are typically used for cutting tools and knives.

4. Duplex Stainless Steels: These have both austenitic and ferritic characteristics, offering high strength and corrosion resistance. They are preferred in marine and chemical industries.

5. Precipitation Hardenable (PH) Stainless Steels: These are high-strength and corrosion-resistant, often used in special applications like the aerospace industry.

6. Others: This category includes many specialized types of stainless steel designed for specific applications or requirements.

Stainless steel grades come with different chemical compositions and properties, so selecting the right grade depends on the specific application or use. Each grade has its own advantages and disadvantages, so the choice should be made based on the needs of a particular project.