The hot and red molten iron flowed out, which immediately shocked everyone, even the craftsmen working here were like this.

They have been engaged in iron smelting for many years, but it is rare for them to directly dissolve into iron.

"It's done in such a short time?" Li Zheng said in surprise.

"Did you notice that the molten iron flowing out is very clean and does not seem to be contaminated with too many impurities." Master Xi said in surprise after looking closer.

Wang Kang, who was standing by, smiled and said nothing. He could do this naturally because of the unique design of the floor furnace.

Wang Kang has largely participated in the construction of this ground furnace to the design of modern flat-turn steelmaking furnaces.

During the smelting process of iron ore, the fuel slag or residue after iron smelting will be separated and filtered from the iron liquid, and the iron liquid will gradually seep into a special container.

Then it flows into the extended diameter tube and leads to another floor furnace, thus forming a finished production line.

Master Xi said, "Master Kang, if you can melt the iron ore to this level, you will be a good iron embryo when the iron solidifies. If it is beaten and tempered, the quality will be even better!"

He was responsible for iron smelting in the Metallurgical Construction Bureau, so he naturally understood this truth.

Wang Kang shook his head: "This is not enough!"

If you really follow what Master Xi said, you can indeed get steel, but it is too waste of manpower and time.

The essential difference between steel and iron is actually the difference in carbon content. Iron with a carbon content exceeding 2% is called pig iron; iron with a carbon content less than 0.05% is called dry iron; iron with a carbon content of 0.05%-2% is called steel.

For example, after the iron dissolved is solidified, it is pig iron. The carbon content of pig iron exceeds the standard, so it needs to continue to be refined.

The few people continued to watch. At this moment, the molten iron had flowed to another floor furnace, which was different from the previous one.

Because there is no layered structure inside this floor furnace, it is similar to a closed round barrel.

At this moment, the fire in this ground furnace had already arisen, and after such a long period of suffocation, the temperature was already extremely high.

At this time, a craftsman poured iron powder into the opening on the side of the floor furnace.

Seeing this scene, Li Zheng was shocked and said hurriedly: "You have dissolved iron to this level, why do you still need to add iron powder?"

"Isn't this an unnecessary move? Is it ruined the original smelting?"

"Master Kang, this is a failure. Let them stop!" Master Xi also said busy, they could not understand at all.

Upon hearing this, Wang Kang said lightly: "What is refined through the first furnace can be called pig iron. Pig iron has a high carbon content, so it requires secondary smelting."

"What is the carbon content? What is this?" Li Zheng and others were a little confused when they heard it.

"Carbon content is a standard for judging the material of refining." Wang Kang said.

But these words made them even more confused.

Wang Kang slapped his forehead, "You'd better watch first, and I'll explain it to you later."

At this moment, the pouring of iron powder has ended. Since it is close to the floor furnace, the craftsmen are sweating all the time...

"What is that doing?"

Wang Fuchen pointed to the ground furnace, and a craftsman was repeatedly turning a rocker arm, looking at the rocker arm that seemed to extend out of the ground furnace.

"This is for stirring." Wang Kang explained.

"What to stir?" asked Master Xi. What he saw today did make them confused.

They couldn't understand Wang Kang's every step. You should know that the three of them were old craftsmen in the Metallurgical Engineering Bureau and were all specialized in the field of iron smelting.

At this moment, they asked Wang Kang about everything, and they didn't even notice this.

Wang Kang explained: "Add iron ore powder and stir continuously, using the oxygen in the air to remove part of the carbon in the pig iron, so as to reduce the carbon content in the pig iron!"

"The reason for high temperature smelting is to remove the slag in it, so that steel can be obtained directly!"

Wang Kang said in a deep voice: "I call this method of steel making the steel stir-frying method!"

It has to be said that the working people in ancient times were great, and iron smelting and steelmaking have always been in the world's leading position. The rough development history has gone through several stages.

The first steel filling method was used.

Then there is the block refining method, which is to refine iron ore into spongy solid blocks.

Because the refining is rough, the texture is soft and contains a lot of residue, it needs to be forged. Simply put, it is to roast, beat, and be beat, and be repeated like this...

This increases the content of carbon components and evenly distributes it to forge steel.

This is also the origin of the steel that has been refined into hundreds of steel!

In this era when Wang Kang lived, he roughly used this method, but they had not realized the existence of steel.

Master Xi has purified the quality of iron embryos, which should be like this.

Wang Kang used a more advanced method, the steel frying method, which first appeared in the middle and late Western Han Dynasty. The invention of this technology was a major breakthrough in steelmaking technology.

Combined with the current conditions and environment, it was adopted by Wang Kang, but in this process, Wang Kang combined some knowledge from his previous life, such as the construction of a floor furnace...

"The method of steel frying?" Several people were stunned.

"Is steel a material that you said is harder than iron?" Li Zheng asked.

"right!"

The questions from several people interrupted Wang Kang's thoughts.

Master Xi took a deep breath, "Then we will wait and see. If you can really succeed, that's a real innovation!"

At this moment, their suspicion was reduced a lot, because Wang Kang's new refining method and many theories that he had never heard of before made them convince.

The iron powder and molten iron are fused and permeated during stirring. This process is equally important, and the time and temperature must be grasped well.

If the carbon component increases, there is no effect. If it is over, it becomes ripe iron, which is equivalent to being scrapped.

However, Wang Kang had already thought of this problem in advance, and the ratio of iron ore powder and molten iron was just right!

After a while, Wang Kang personally went over to command, "Stop, turn on the furnace!"

Upon hearing this, all the craftsmen were also stunned, because the final result was about to come out, whether it was success or failure, it was at this moment!

Under Wang Kang's instructions, all the craftsmen moved a rocker arm. This was a mechanism that could open a hole in the inner furnace and drain the molten iron out!

Soon after some operation, the second melted molten iron flowed out along the pre-distributed channel.

The flow direction is a dirt model!

The soil mold is round and is more than three meters long. If someone pays attention, he will find that the length is exactly the same as the height of the tunnel being dug out!

"Young Master Kang, do you want to make the finished product directly? No need to be tempered?" Master Xi asked in surprise.

"No need!" Wang Kang replied with a smile.

"The first one has been completed, change the next mold, hurry up!" shouted the foreman.

Soon someone immediately placed the new mold and continued to pour molten iron.

At this time, Master Xi took off his shirt and shouted to Wang Kang: "Master Kang, I want to personally check whether the refined one is as hard as you said, is harder than iron!"

"Ha ha!"

Wang Kang laughed and said, "You can test it..."
Chapter completed!