I love my spear greatly, and though it is short (Three inches short of 5') and its name is 'Birger the Ugly', it still is a mean weapon, if somewhat misshapen.
Since it's made out of an HC railroad spike, it's probably actually medium-carbon steel, around 40 point. As such, I did not temper it because it's meant to be tough. I've thrust it through various mediums, and because I'm not very concerned about keeping the 'finish' on it pristine, I quite happily use it to cut through soda cans. The cuts are ragged, seeing as the edge itself does not have a very acute bevel. I also only used files, which do not help to give an even edge.
One of the more noticeable imperfections in the spear is the twisted gap in the socket. Normally it's supposed to be straight, but while curling the socket around a bick, I did not hit it properly, and so my blows bent the socket in but also twisted it.
I eventually stuck the finished head onto a pine dowel (1 1/2 inch). Knowing it was pine, but wanting to see how well the head cut, I put it up against 3/4 inch bamboo. Guess who won?
I recently re-mounted it on a shovel handle, which is why the spear shaft looks a little funny.
Now, on to images!


Birger the Ugly, with 12 inch ruler for comparison.


The head, with ruler again.


A side-view. Like I said, ugly.


A younger version of myself and my teacher forming the 'neck' of the spearhead with a top and bottom fuller.