4J42 bụ ígwè-nickel ofu mgbasa alloy, tumadi mejupụtara ígwè (Fe) na nickel (Ni), na a nickel ọdịnaya nke banyere 41% ka 42%. Tụkwasị na nke ahụ, ọ nwekwara obere ihe ndị na-achọpụta ihe dị ka silicon (Si), manganese (Mn), carbon (C), na phosphorus (P). Nke a pụrụ iche chemica compositi...
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