... : 304, 304L, 316, 316L, 321 2) Forming type: mandrel-forming 3) Standards: ASME B16.9,MSS SP-43 Steel Coupling1) Materials ... : 304, 304L, 316, 316L, 321 2) Forming type: mandrel-forming 3) Standards: ASME B16.9,MSS SP-43,DIN 2605,JIS ... ,SH 3409,SH 3409,HG/T 21635,HG/T 21631 4) Sizes: seamless:1/2"-20"(DN15-DN500),SCH5S/10S/40 ...