blackheart ferritic malleable cast iron, black heart ferritic malleable cast iron, blackheart ferritic malleable iron
blackheart malleable cast iron, the microstructure of which has a matrix essentially of ferrite (see: blackheart malleable cast iron; compare: blackheart pearlitic malleable cast iron), must tempermalm (tumeda murdega tempermalm), mille metallmaatriksi mikrostruktuur on valdavalt ferriitne (vt must tempermalm; vrd must perliittempermalm)
