pearlite malleable iron

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1)pearlite malleable iron,波来铁展性(可锻)铸铁2)malleable iron,可锻<展性>铸铁3)malleable iron,展性铸铁(可锻铸铁)4)malleable cast iron,可锻铸铁，韧性铸铁，马铁5)black heart malleable cast ir,黑心可锻铸铁，黑心展性铸铁6)blackheart malleable cast iron,黑心展性铸铁，黑心可锻铸铁