1. Size Standards: The nominal diameter (DN) range is typically DN15-DN600, while the American standard corresponds to 1/2"-24" (ANSI B16.47).
2. Pressure Rating: European standards include PN6/10/16/25/40/64/100, while American standards include Class 150/300/600. For example, a Class 300 flange can withstand a pressure of approximately 5.1 MPa at 38°C (ASME B16.34).
3. Material Options: Carbon steel (Q235), stainless steel (304/316), alloy steel (16Mn), etc. The upper corrosion temperature limit for 304 flanges is 400°C (GB/T 1220).