Chapter 293

PS: I'm sorry, Calvin. Let's fight against Dracula decisively.

PS1: it's better to intersperse the farming field between the wars. Anyway, the seeds have been planted. It's OK to switch to farming whenever you want. Everyone says that explosion of technology is equivalent to opening up and will lose interest, so farming is over.

PS2: I'm very sorry for the depravity!

When it comes to charcoal and coal, we have to mention the final product of these two kinds of smelting, steel.

The so-called steel is the product of carbon, silicon, manganese, phosphorus, sulfur and iron, known as iron carbon alloy.

Carbon steel is the most commonly used steel and the easiest to smelt. According to the carbon content, it can be divided into low carbon steel, medium carbon steel and high carbon steel. The difference of carbon content also represents the different texture of steel.

The best steel-making material is coke, but Coke needs to be completely isolated from air to produce dry distillation, and the raw material is bituminous coal.

In this case, Carmelo can't store coke at all.

Therefore, high temperature smelting can only be used to reduce the requirements.

The melting point of pig iron is about 1200 to 1500 degrees centigrade. In this case, only anthracite can be directly melted into molten iron. Even the charcoal can be concentrated together and pressurized through the bellows. The ignition point after oxygen injection can melt pig iron directly and smoothly.

The lower the carbon content, the stronger and harder the steel.

The steel with different carbon content has different texture and application direction.

Tough and strong steel is the best material for armor and swords, while the hard but brittle is the texture of other building materials. Now the problem is how to build a blast furnace.

The blast furnace for steelmaking is built up of layers of bricks and cement. Unfortunately, copper pillars are used as supports because there is no reinforcement.

Six huge copper pillars were used as supports. After three layers of bricks were laid outside the pillars, a thick layer of cement paste was used, and with the appropriate pattern, a circular layer by layer inclined blast furnace was built.

There is a huge amount of charcoal in every layer of the blast furnace, and in order to complete the construction of a furnace faster, heat dissipation should be carried out as soon as possible, because the replacement is not coking coal or anthracite with a long burning time, but directly put into the charcoal. The high temperature generated by the charcoal generated by a large amount of oxygen can melt molten iron in an instant, and then the molten iron will flow directly into the next layer along the concrete slope The next layer still has burning charcoal, and the advantage of keeping the temperature of the hot metal from solidifying into steel and then rolling is that while this movement is taking place, the molten iron deposits carbon in the blast furnace and then flows the iron down.

In this way, after seven layers, the molten iron finally flows out of the slate like groove and is poured into a mold made of clay.

The mold is directly through the whole mold, and then let the molten iron flow into the next mold. In such an experiment, we can directly produce 20 parts or 20 weapons directly through calculation.

Because the first test used a knife mold, everyone cheered when the hot metal flowed into the mold.

Because of the good calculation, when the last drop of molten iron slipped out, the crowd burst into cheers no less than a victory.

One reason is that if water is used for cooling, the steel will crack and even make the steel brittle. This is absolutely different from the previous concept.

The next day, the mold was opened.

The shape of the mold is cylindrical, which facilitates the flow of molten iron, and then flows into the next mold through the next small cylinder.

But when you open it, the little cylinder stays directly in it.

There will be craftsmen with a hammer to break these small cylinders and then store them together. This is steel. As a raw material, it will neither be moth eaten nor damp and moldy. It is almost the perfect reserve material, which can be directly stored in the open air.

Then he knocked off the iron bars before and after, and a group of craftsmen began to come forward.

Not all molds are knives.

It's twenty molds, each of which is a different weapon.

Although they are all swords, they are different.

When it comes out, the first process is grinding.

With a quick pedal type round grindstone, the craftsman sitting on it puts the knife on it.

In a flash, the blade produced a spark on the fast rotating pedal type millstone. The bright spark let the students nearby burst into an exclamation.

Anyway, it's really rare to see such things before.

The blade of the knife is very long, so it takes an hour to just one side.

After two hours, the polished blade was oiled and waxed to prevent rusting.

Then he handed it to another woman who had been waiting for a long time. This woman was Carmelo's best craftsman. She tied the handle tightly with the best rattan, and a weapon was presented to kylar.

"Good." This is a long knife. The curved one is different from the saber of desert people. This kind of curve is very strange. It's a strange shape with sharp outside being put into the inside.It looks like a horse leg knife.

The blade was on the inside of the horse's leg, and then it was waved by Keller.

"Good knife!" At the same time, the two knights of the round table praised at the same time.

"Andrew, try it." Keller throws the knife.

The other side just raised his hand and grasped the long knife.

Although the shape of the sword was strange, its sharpness was correct. It was definitely a good sword. He could not help but look at the second Knight Sword which was being ground. It took twice as long as the sword to be sharpened in all directions. Here we can see why the sword was eliminated by the sword. It took twice as long to produce two swords, and the appearance of the sword made the sword complete It became the decoration of the nobility.

This knife is what he needs to test.

The degree of tenacity, firmness and sharpness.

It's a big stick that's the size of an adult's arm.

All the people saw was a flash of silver, and the stake was directly divided into two.

What a quick knife!

No, it's not so much that the knife is fast as it saves him more energy and exerts more power.

The shape of this kind of knife is not simple! Take a close look at the blade with appreciative eyes. The place where the knife needs to be polished is not only the blade, but the whole blade and the handle.

This knife, on the contrary, is like a work of art.

It's shiny.

"Lauran, try the knife with me!" He exclaimed, the word knife was taught to them only yesterday by Keller.

"Come on," Lauran cried, drawing out his knight's sword.

They bump into each other fiercely, and then only see a flash of sparks between them. The sword in Laurent's hand is not ordinary product. Compared with the mass-produced product of the mold in Andrew's hand, what he has in his hand is a sharp Dragon Sword grinded by dragon's claws.

But even this dragon sword is still shocked by the hardness of the other's sword. What happens when two hard opponents of the same level collide with each other? Wipe out the bright spark!

Both of them pushed back at the same time, startled by the cold air.

Lauran baby looked at the sword in his hand, it was still that kind of white bone, without a trace of luster or damage.

But that knife has already had a crack. In the final analysis, it is still mass production! (to be continued. If you like this work, you are welcome to start（ qidian.com ）Your support is my biggest motivation to vote for recommendation and monthly tickets. )

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