Kovar 4J33 round bar Co257 round steel expansion alloy light bar iron nickel alloy bar. Chemical composition The main chemical components of 4J33 alloy include iron (Fe), nickel (Ni), cobalt (Co) and ...View More
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Precision Kovar 4j33 Co257 Round Steel Expansion Alloy Bright Bar Iron Nickel Alloy Bar Good Electroplating Performance