Chapter 93 (2/2)

If smokeless powder appears in this era, and then you use this kind of gun barrel made of wrought iron or pig iron, then ten guns will definitely explode ten times!

Shi Xiong plans to use medium carbon steel for his first casting barrel.

Thanks to the first batch of medium carbon steel stir fried with kaolin clay crucible, now the stone bear and wood planer are very confident in refining a pot of medium carbon steel.

Although medium carbon steel is not the best material for casting gun barrel, it is many times stronger than wrought iron or even pig iron!

For example, the special steel used for gun barrel manufacturing in later generations, even the most common 40Cr steel, can't be straightened out in any case.

Not to mention the quenching process, the stone bear knows nothing about it. Although he knows water quenching, oil quenching, low temperature tempering, medium temperature tempering and high temperature tempering, he really doesn't know how to do it.

There are also technologies such as drilling and precision cold forging used in the manufacture of gun barrels, which are not available to stone bears now.

So, it's better to make the first barrel in your life by casting honestly.

”What is this? Can steel be made from this? ”

”Oh, MAIGA, isn't this earthen pot bad?”

”Jesus Christ, am I right? Why don't you use sand to make molds? Can this clay withstand the high temperature of molten iron? ”

......

Having been standing by and watching the stone bear, Lieutenant Ferguson, who is busy, can't help it any more. He begins to turn into a curious baby. His mouth turns into a Gatling machine gun. One by one, questions keep popping out of his mouth.

At first, Shi Xiong explained, but later he was too lazy to explain. If you explain everything to this guy, you won't have to do anything today.

Before making a fire, you need to make a mold. In order to make the inside and outside of the barrel more smooth and minimize the existence of sand holes, stone bear and wood planer carefully prepared the kaolin clay mold.

The melting point of kaolin is close to 1800 degrees, and the temperature of molten steel can not destroy the kaolin mold. And kaolin is much more delicate than sand, so the roughness of gun barrel produced by this way is far lower than that produced by sand mold casting.

It's difficult to make this mold. Several people work together, and they work until noon. In order to prevent the bore from exploding, when making the mold, Shi Xiong specially thickened the part of the powder chamber, so that after the barrel is cast, the part of the powder chamber will be thicker than other parts.

After all, the blast chamber is almost always in the powder chamber, which is the place where the whole gun is most stressed.

After the mold is made, the next step is to make steel