1. Material Selection: Stainless steel flanges are typically made using stainless steel types 304 or 316. The choice of material depends on the application requirements of the flange.

2. Material Cutting: Stainless steel plates are cut to obtain the basic shape of the flanges. CNC (Computer Numerical Control) cutting machines are often used for this process.

3. Shaping: The cut plates are then pressed or forged to take on the shape of the flanges, ensuring precision in size and shape tolerance.

4. Hole Drilling: Holes are drilled in the center of the flanges for pipe or tube connections. These holes allow for a tight connection between the flange and the pipe.

5. Surface Treatment: Stainless steel flanges go through various surface treatments to achieve a smooth finish and prevent corrosion. These treatments may include grinding, polishing, and passivation.

6. Testing: The produced flanges undergo various quality control tests, including dimension checks, leak tests, and material analysis.

7. Marking: Flanges are marked with essential information such as size, class, material type, and manufacturer details.

8. Packaging and Shipment: The manufactured stainless steel flanges are appropriately packaged and shipped to customers or sales points. 

Stainless steel flanges are available in various types and sizes. Each type of flange is designed and manufactured to meet specific application or industry requirements. Additionally, compliance with international standards (e.g., ANSI, ASME, DIN) should be considered. These standards define crucial details such as flange dimensions, tolerances, and performance specifications.