Of course, the difficulty is obvious.

The smelting technology of these years did not reach the point where it could cast high-strength steel that could withstand the enormous pressure of a gunpowder explosion without damaging it. In later generations, Li Yuan's knowledge in this area was not enough, but Li Yuan understood that the metal used to cast the barrel should not only have good ductility, but also have a certain strength.

In these times, it is not easy to do this. The late Tang Dynasty and the Fifth Dynasty naturally also had the process of iron-smelting furnaces, but steel

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