Forging affects the metal in two ways
1. It increases the hardness of the metal. This is because forging compresses the metal and causes it to cool more quickly than it would in its original form
2. It creates an internal structure that is different from what you would expect from a piece of steel. The internal structure can be beneficial, but it could also create problems with the finished product if not done properly or if there are problems with the steel itself.
what does forging do to metal