<P> The mechanical properties of iron and its alloys can be evaluated using a variety of tests , including the Brinell test , Rockwell test and the Vickers hardness test . The data on iron is so consistent that it is often used to calibrate measurements or to compare tests . However , the mechanical properties of iron are significantly affected by the sample 's purity : pure , single crystals of iron are actually softer than aluminium , and the purest industrially produced iron ( 99.99 % ) has a hardness of 20 -- 30 Brinell . An increase in the carbon content will cause a significant increase in the hardness and tensile strength of iron . Maximum hardness of 65 R is achieved with a 0.6 % carbon content , although the alloy has low tensile strength . Because of the softness of iron , it is much easier to work with than its heavier congeners ruthenium and osmium . </P>
<P> The mechanical properties of iron and its alloys can be evaluated using a variety of tests , including the Brinell test , Rockwell test and the Vickers hardness test . The data on iron is so consistent that it is often used to calibrate measurements or to compare tests . However , the mechanical properties of iron are significantly affected by the sample 's purity : pure , single crystals of iron are actually softer than aluminium , and the purest industrially produced iron ( 99.99 % ) has a hardness of 20 -- 30 Brinell . An increase in the carbon content will cause a significant increase in the hardness and tensile strength of iron . Maximum hardness of 65 R is achieved with a 0.6 % carbon content , although the alloy has low tensile strength . Because of the softness of iron , it is much easier to work with than its heavier congeners ruthenium and osmium . </P>
what is the purest form of iron called
what is the purest form of iron called
pure , single crystals
pure , single crystals