develops a damascus pattern, or in other words, a unique wood grain-like pattern. Incidentally, the pattern on a Japanese sword is also one kind of damascus pattern.)
However, it does have a weakness. Because the gun barrel is made by rolling ribbon-shaped material, compared to molded barrels the strength is weak, and after the invention of smokeless gunpowder production declined. This is because it was unable to endure the pressure, and so the gun barrel becomes prone to breaking.
After that, in the year 1856, the Englishman Henry Bessemer made a groundbreaking invention, the "converter", and large amounts of molten steel became available. The so-called Bessemer process is a method of making steel by blowing air against molten pig iron (iron produced by melting iron ore in a blast furnace, contains lots of impurities) causing an oxidation reaction, removing impurities. (removing by burning)
After that various alloys can be made.