Stainless Steel Flanges has various models, standards and specifications. Here is some common stainless steel flange information:

‌Model and material‌:

304 stainless steel flange: Good corrosion resistance, suitable for low-pressure and medium-pressure pipeline systems, such as water supply and drainage, fire protection, HVAC and other fields.
316L stainless steel flange: Stronger corrosion resistance, can withstand strong corrosive media, suitable for high-pressure and high-temperature pipeline systems, such as petroleum, chemical, power and other fields.
2205 stainless steel flange: Duplex stainless steel flange, with higher strength and toughness, suitable for high-pressure and high-temperature pipeline systems, such as shipbuilding, marine engineering and other fields.
310S stainless steel flange: High oxidation resistance, can remain stable in high temperature environment, suitable for high-temperature and high-pressure pipeline systems.

‌Standards and specifications‌:

Diameter specification: usually in millimeters (mm), such as DN10, DN15, DN20, etc., up to DN5000.
Pressure level: 0.25Mpa ~ 250Mpa (150Lb ~ 2500Lb).
National standards: including national standards (GB9112-88, etc.), American standards (ANSI B16.5, etc.), Japanese standards (JIS 5K, etc.), German standards (DIN2527, etc.), etc.

Please note that when making specific choices, the model, standard and specification of the stainless steel flange should be determined based on the actual engineering needs, application scenarios and characteristics of the pipeline system. At the same time, there may be differences between different manufacturers and regions. It is recommended to carefully check the relevant standards and specifications before purchasing.