i only know....
in old age cavemen learn to make and craft weapons and tools for
battling and hunting.....the first were made from stones and wooden
stacks, sharpened with a rock. later mankind evolve and discovered
the natural iron ore...some smart ass learnt to melt the ore into
molten (liquid) state at high temperatore fire stoves and the first
sword and spears were made....very heavy and hefty but a sturdy
weapon nevertheless. Creativity brought forth combination of metals
in reasonable percentage called alloying and steel was created.
swords and spears then became lighter and tougher against corrsion,
wear and punishments from clashes of steel on steel.
now you seldom see iron existing in products as itself but will
usually combine with other alloys in the form of steel...different
grades of steels. other alloys such as lead, brass and even steel
bullet cartridges (very true in certain stages of battles iin WW2)
are now employed in the manufacture of ammunition while polymers of
hard plastic nature are used in the body and magazines of automatic
and assault rifles.
i got F9 for my chemistry and e8 for my english anguage....but see
here i write these stuff no problemo 
