In the history of steel smelting in the world, through the development process of block smelting, 100 steel smelting and frying steel, the most glorious working people in China invented the steel filling method for the world's steel smelting technology, made a major development and epoch-making contribution.

The principle of the steel filling method was originally to embed the pig iron sheet in the middle of the coiled wrought iron bar, seal the steelmaking furnace with mud, and smelt it, so that the pig iron liquid can penetrate into the wrought iron better and more evenly.

Later, it was slowly improved, and the technology of the steel filling method became more mature.

Pig iron can be turned into steel by decarburization, and wrought iron can also be turned into steel by carbon infiltration.

In the steel filling method, pig iron, as a carburizing agent, accelerates carburizing into wrought iron due to the high temperature after melting, which not only shortens the smelting time, but also improves efficiency.

This smelting method is simple to operate and easy to master, and if you want to obtain steel with different carbon contents, you can obtain it by mixing pig iron and wrought iron in a certain proportion and smelting it.

But Donna never expected that the dwarves not only mastered the method of frying steel, but also knew how to fill steel, which was too unexpected.

Also shocked were the two dwarves, the steel filling method was invented by a master blacksmith of the dwarf clan, because this smelting method using black stone as fuel can quickly increase the temperature of the iron-making furnace, so as to smelt a large amount of steel, which has always been the top secret of the dwarf race, but they did not expect that a pirate leader actually knew the principle of the steel filling method.

Could it be that there are traitors among the dwarves? Is it impossible? There will never be traitors among the united and loyal dwarves.

That...... How did Donner know.

Urus trembled and pointed at Donald, and said in horror: "Impossible, no one knows this smelting method, how do you know?"

Donner pouted, but didn't speak. It's still too little knowledge, the technology that has long been eliminated, and it's embarrassing that God is mysteriously hidden and hidden, and when the head of the regiment figures out the refractory bricks and builds a small blast furnace, the endless supply of steel will not surprise your jaw.

Or wait until it is upgraded to a real blast furnace, supporting a reverberatory furnace or something, from ore smelting to steel dragon, and you must not be scared to death?

However, Donner didn't think that this was because he had lived on the earth with highly developed industrial technology and had a wide range of knowledge, so he didn't think it was unusual.

But among all the races in the Holy Light Continent, it has to be said that in terms of steel smelting, the dwarven race has left everyone behind.

Not to mention the steel filling method, if the steel frying method alone spreads to the mainland, it will cause a huge sensation, and it is not surprising that war will break out as a result.

You must know that in the Holy Light Continent at this time, if you want to obtain a weapon made of steel, you still need to forge it with a hammer!

Qinglusi looked dazed and asked Urus, "Big brother, could it be that humans have also mastered this smelting method?"

Urus was still dumbfounded, Donner smiled, and said, "No, this method should be known to me, if you don't believe it, ask Anderson, the rest of the human race knows." ”

Anderson shook his head, he knew from their conversation that this smelting method was more powerful than the technology that the dwarves had just used, but as far as he knew, humans hadn't even mastered this method.

"Commander, can you tell you how you learned about this method?, is there a traitor in the dwarf race?" Urus took a deep breath and asked, this is a matter of life and death for the dwarf race, and it must be cautious. You must know that many dwarves, in order to keep the secret of the steel frying method, can give up their own lives.

"I can't tell you how I got this method, but I do tell you that I didn't know it from other dwarves, so don't worry," Donner laughed.

Then, in an even more seductive voice, Donner said, "Not only this method, but I know of other more powerful smelting techniques, do you want to know?"

What the?

Urus is not calm at all, is there any other steel smelting technology in this world that is more powerful than the steel filling method?

Impossible, absolutely impossible!

Despite not believing it, Urus couldn't help but ask, "What method?"

"Haha!" Looking at the dwarven brothers' expressions, Donner laughed, "Don't worry, as long as you stay in the Liberation Regiment, I believe you will definitely see it in the future." ”

The dwarven brothers wanted to continue asking, but Donner stopped them with a wave of his hand: "Okay, don't worry, work hard, you will see one day." ”

"So...... Next, I need you to help me cast something from an ingot. ”

"What is it?" Urus asked, suppressing his thoughts.

"An iron pipe!" Donner smiled mysteriously, then pulled out a blueprint from his pocket that had already been prepared and handed it to Urus.

Once again, the three-dimensional view of the drawings shocked Urus. Experienced dwarven blacksmiths usually craft weapons with their minds in mind and then forge them in one go.

If it is successful, it will be successful, and if it is not, the forged weapon will be scrapped and need to be forged again.

Urus took the drawings and thought that if everything could be drawn on paper from all angles like this beforehand, I am afraid that there would never be such defective products in the creation of weapons again!

The drawings are also marked with proportional dimensions, which are the international standard of length and measurement that are different from those used by the dwarves, especially the Arabic numerals on them, which are no different from the Book of Heaven in his eyes.

But Urus could still vaguely guess that it should be the length, so he pointed to the numbers below the drawing and asked Donner, "What do these little prints mean?"

Donner patiently explained to them, and it dawned on them how big they were about to cast.

Urus studied the drawings, and Donner asked, "Can you cast it?"

Urus didn't speak for a moment, and after glancing at it, Qinglus pouted, "Isn't it just a large iron pipe? ”

Donner rolled his eyes, his tone was so big, and he was not afraid of the wind flashing his tongue, not to mention anything else, he had the ability to build a bearing for me, even if you won.

But Donner didn't say anything, just smiled and said, "Okay, let's get started!"

Urus nodded, and arranged for the two apprentices to reheat the furnace.

Donner discussed with the two dwarven brothers how to cast.

In fact, in the final analysis, artillery is a larger musket, the principle is simple, but it is quite difficult to get a standard barrel.

A large part of the early artillery was actually the same as the arquebus, which was forged into iron sheets and rolled into iron rods to beat into shape.

But this method is too slow, and the barrel is difficult to pass. So for Donner, who knew more about the way, it was simply impossible to use such a low-level method to make artillery.

The cannon casting work was already prepared for Donner, and as soon as the dwarven brothers melted the ingots, Donner had the prepared clay model placed on the ground.

The clay mold is composed of a mold and a transverse shell, and when the tap hole of the melting furnace is opened, the ingot solution is injected into the clay mold.

Wait until the casting has cooled and break the mud mold to get a giant iron pipe.

Casting may seem simple, but the quality of iron pipes often depends on the skill of the blacksmith.

And getting an iron pipe doesn't mean that you can make a good barrel.

Later, it should be filled with water to test whether there are cracks in the iron pipe. Of course, an experienced blacksmith can knock on the main body of the iron pipe, and you can judge whether it is qualified by listening to the sound.

If the iron pipe has a crack and is used as an artillery, there is a high chance of exploding, which means that the iron pipe is not qualified.

Of course, after confirming that the iron pipe is qualified, you can proceed to the next step of processing.