4J29 specification:plate,sheet,strip,rod,bar,wire,tube,etc. Looking forward to cooperating with you! 4J29 ... /T5231-2005 ,(FeNi29Co18),Lockinvar,Alloy 12B,Sealing Alloy. Iron Nickel cobalt. Note:A Nickel-Iron-Cobalt, controlled expansion alloy containing 29% Nickel ...