1) Standard: ANSI, DIN,BS, JIS, UNI, etc 2) Material: 304, 316, 304L, 316L, 321, Q235, A105, ... , HG20596, HG20597, HG20598, HG20599, HG20560, HG206601, HG20602, HG20603, HG20604, HG206053. UNI Standard flangesUNI2276, UNI2277, UNI2278, UNI2280, UNI2281, UNI2282, UNI2283, UNI2284, UNI2254 ...