Assertion: alloy's iron | /r/HasProperty | soft
Facets:
value: to be useful
type: PURPOSE
Source sentences:
text: In pure iron, the crystal structure has relatively little resistance to the iron atoms slipping past one another, and so pure iron is quite ductile, or soft and easily formed.
text: Pure iron without the addition of carbon is too soft and ductile to be useful for most applications, while concentrations about 2.1% produce an alloy that is brittle and impractical to work with using conventional metalworking techniques.