Chapter 219

The hot and red molten iron suddenly surprised everyone, even the craftsmen working here.

They have been engaged in smelting iron for many years, but few of them can directly melt into molten iron.

"In such a short time?" Li Zheng was surprised.

"Did you find that the molten iron is very clean, and it doesn't seem to be contaminated with too many impurities?" Master Xi looked closer and was also surprised.

Wang Kang, smiling and silent, can do this naturally because of the unique design of the stove.

Wang Kang participated in the design of modern horizontal rotary steelmaking furnace to a great extent.

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

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

Master Xi said: "Master Kang, if you can smelt the iron ore to such a degree that the molten iron solidifies, it will be a good iron embryo. If it is hammered and tempered, the quality will be even better!"

He was in charge of smelting iron in the metallurgy bureau, and naturally understood this truth.

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

If master Xi said that, we can get steel, but it's too waste of manpower and time.

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

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

Several people continue to watch, at the moment, the molten iron has flowed to another furnace, which is different from the previous one.

Because there is no layer upon layer structure in this furnace, it is similar to a closed barrel.

At this moment, the fire in this furnace has been burning for a long time, and after such a long time, the temperature has been extremely high.

At this time, a craftsman poured iron powder from the opening on one side of the stove.

Seeing this scene, Li Zheng was surprised and said: "you have melted iron to this extent. Why do you want to add iron powder?"

"Isn't that unnecessary? Will the original smelting be destroyed? "

"Master Kang, it's a failure. Let them stop now!" Master Xi is also busy. They can't understand it at all.

Smell speech, Wang Kang light way: "after the first furnace refining out, can be called pig iron, pig iron high carbon content, so need secondary smelting."

"What's the carbon content? What is this? " Li Zheng was a little confused.

"Carbon content is a standard to judge the quality of refined materials." Wang kangdao.

But this made them even more confused.

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

At this moment, the dumping of iron powder is over. Because it is close to the furnace, the craftsman is sweating

"What's that doing?"

Wang Fuchen pointed to the stove. A craftsman was repeatedly turning a rocker arm, which seemed to extend from the stove.

"This is for stirring." Wang Kang explained.

"What to stir?" Master Xi asked, what I saw today really confused them.

They can't understand Wang Kang's every step. You know, all three of them are old craftsmen from the metallurgy and manufacturing Bureau, and they are good at iron smelting.

At the moment, they were asking Wang Kang about things, which they didn't even realize.

Wang Kang explained: "adding iron ore powder, stirring constantly at the same time, using oxygen in the air to remove part of the carbon in pig iron, so as to reduce the carbon content in pig iron!"

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

Wang Kang said in a deep voice: "I call this method of steelmaking stir frying method!"

It has to be said that the ancient working people were great, and iron and steel smelting has always been in the leading position in the world. The general development process has gone through several stages.

The first method used was pouring steel,

followed by block refining, which is to refine iron ore into sponge like solid blocks.

Because the refining is rough, the texture is soft, and there is a lot of dross, so it needs to be forged. In short, it's burning, beating, burning, and so on

Therefore, the carbon content is increased, and the distribution is uniform, and the steel is forged.

This is also the origin of steel!

Wang Kang, for example, used this method in this era, but they didn't realize the existence of steel.

Master Xi once purified the quality of iron embryo, which should be like this.

Wang Kang used a more advanced method, stir frying method, which first appeared in the middle and late Western Han Dynasty. The invention of this technology is a major breakthrough in steel-making technology.Combined with the current conditions and environment, it was adopted by Wang Kang. However, in this process, Wang Kang combined some previous knowledge, such as the construction of underground stove

"Fried steel method?" Several people were shocked.

"Is steel what you call harder than iron?" Li Zheng asked.

"Yes

Several people's questions interrupted Wang Kang's thoughts.

Master Xi took a deep breath, "then we'll wait and see. If you can really succeed, it's really a pioneering work!"

At the moment, their suspicions were also reduced, because Wang Kang's new refining method and many unheard of theories convinced them.

Iron powder and molten iron are fused and infiltrated in the mixing process. This process is equally important, and the time and temperature should be well controlled.

If the content of carbon increases, it will have no effect. If it has passed, it will become cooked iron, which means it will also be wasted.

But Wang Kang had thought of this problem in advance, and the ratio of iron ore powder and hot metal was just right!

After such a short time, Wang Kang personally went to command, "stop, turn on the stove!"

Smell speech, all craftsmen are also a Zheng, because the final results to come out, is success or failure, at this moment!

At the command of Wang Kang, all the craftsmen went to move a rocker arm, which is a mechanism that can open a hole in the inner furnace and flow molten iron out!

Soon after some operation, the molten iron after secondary smelting flowed out along the pre arranged channel.

The location of the flow direction is a soil model!

The soil model is round, more than three meters long. If anyone pays attention, it will be found that the length is exactly the same as the height of the excavated tunnel!

"Master Kang, do you want to make finished products directly? No need to temper? " Master Xi asked.

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

"The first one has been finished. Change the mold. Hurry up!" Cried the foreman.

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

But at this time, master Xi took off his coat and said to Wang Kang in a loud voice: "Master Kang, I want to personally test whether the refined product is as hard as iron as you said!"

"Ha ha!"

Wang Kang said with a laugh: "it's up to you to test..."