Checking steel For flaws

Are you inspecting flat bar or are you asking about a knife blade made from 5160?
 
This steel, 5160 has been around for decades, its a very rugged steel and makes great carbon steel blades. I've made many.

Most of all, if the steel was purchased from a reputable dealer all you need to check is how true the bar stock is especially across the bar. You will lose a lot of steel when the bar is cupped. Length wise as long as the bar is not twisted you will be fine. Make sure you know if the bar is annealed [soft].

I have the heat treat info if its needed.

Fred
 
If you were concerned about cracks you could use dye penetrant. I would not think medium carbon steels would be a problem though.
 
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