carbon steel Reducer Describe: Manufacture Standard: ASME/ANSI B16.9 DIN2616 GB12459 (Seamless), GB/T13401 (Welded) SH3408 (Seamless), SH3409 (Welded) TypeConcentric, Eccentric, With hem, Without hemRaw MaterialSeamless pipe, Welded pipe, Steel sheet.Manufacture ProcessPressing (Cold Working, Hot Working), Machining,Welded, Heat treatment