... ,tube. Danyang City KaiXin Alloy Materials Co., Ltd. Iron-nickel-cobalt alloy,kovar alloy,ASTM F15,Nilo-K, Vacon 12,UNS ... ,(FeNi29Co18),Lockinvar, Alloy 12B,Sealing Alloy. Note:A Nickel-Iron-Cobalt, controlled expansion alloy containing 29% Nickel. It's coefficient of ...