... F321F51 F52 F53 F91 F9 F11 F22 F5 F55 F347 F 317 ASME F304, ASME F304L, ASME F316,ASME F316L,ASME ... -40K 5) Sealing Surface: FF, RF, LJ, TG, FM, and R.T.J. Etc6) other: Special design available LWN flange Verified ... /3 Heat treatment sub-contracted to Zhangjiagang Chenchuang Mechanical Technology Co., Ltd. of Yongli Village, Lieyu Town, Zhangjiagang City, Jiangsu Province, China 2011 ...