so the bending parts and other parts have the same hardness and the strength. But is will causing the metal plasticity be greatly reduced, Although it can bearing the force of reverse bending, but under this action, it will be breakage.
so the bending parts and other parts have the same hardness and the strength. But is will causing the metal plasticity be greatly reduced, Although it can bearing the force of reverse bending, but under this action, it will be breakage.