The main performance of an SS304/304L 4.5mm THK hot-rolled stainless steel sheet plate with ASTM A240/A240M specification and a 2B finish includes:

1. Corrosion resistance: SS304/304L stainless steel is known for its excellent corrosion resistance, making it suitable for use in various environments, including those with exposure to moisture, chemicals, and saltwater. The 2B finish further enhances its corrosion resistance.

2. Surface finish: The 2B surface finish is smooth and semi-reflective, providing a clean and uniform appearance. It is free from any visible defects or roughness and is often preferred for applications where aesthetics are not the primary concern.

3. Strength and durability: SS304/304L stainless steel has high strength and good durability, making it suitable for applications that require resistance to wear, impact, and deformation. The hot-rolled process enhances the strength of the material.

4. Formability: Hot-rolled stainless steel sheets, including those with a 2B finish, have good formability. They can be easily bent, shaped, and formed into various configurations without compromising their structural integrity.

5. Heat resistance: SS304/304L stainless steel has good heat resistance and can withstand high temperatures without losing its strength or corrosion resistance properties. This makes it suitable for applications that involve exposure to elevated temperatures.

6. Easy maintenance: The 2B surface finish of a hot-rolled stainless steel sheet is easy to clean and maintain. It resists staining, fingerprints, and smudges, making it ideal for applications where hygiene and cleanliness are important.

Overall, an SS304/304L 4.5mm THK hot-rolled stainless steel sheet plate with an ASTM A240/A240M specification and a 2B finish offers a combination of corrosion resistance, durability, formability, heat resistance, and easy maintenance. It is suitable for a wide range of applications in various industries, including construction, automotive, and food processing.