I was engaged in infrastructure construction in the Han Dynasty [Transmigration Book]

Although he called it steel bars, Liu Tan knew very well that the steel bars he can make now are completely different from the standard steel bars in later generations.

The current level of technology is not up to the standards of later generations, but even so, adding these things to the city wall can make the city wall stronger.

To be honest, no matter what it is, Liu Tan has come into contact with it because of various interests.

He even made some things by himself, but such things as steel bars are really beyond the scope of his knowledge structure.

The only thing he remembers is cold rolling and hot rolling. As for how to roll... I don't know.

Without knowing anything at all, the only thing he can do is to keep experimenting.

It’s just that the treasury has limited money, so it definitely can’t support such an experiment. So in the end, Liu Tan decided to make steel bars by himself, sell the finished products to the court, and then give a preferential price. pay taxes.

This model is also the result of discussions between him and Huo Guang.

The first is to be able to reduce the expenditure of the treasury as much as possible. In fact, Liu Tan took the lead in paying taxes, so those who want to evade taxes should think about whether they are better than the king of the north.

These days, the main income of the imperial court is guaranteed by taxation, and Huo Guang just wants Liu Tan to be a gold-lettered signboard.

Liu Tan also felt that it was better to deal with it this way. Could it be that all the blacksmiths under his command were summoned to make all-out efforts to make steel bars.

Although Liu Tan is a half-baked guy, the craftsmen under him already have experience.

At least I have accumulated a lot of experience in forging and smelting steel. Liu Tan first told them what kind of finished product they want, and then roughly talked about the production process. This time the production process is really very simple. After all, Liu Tan Don't dare to talk about things you don't understand.

After combining the finished product and production process mentioned by Liu Tan, the craftsmen brainstormed directly, and finally gave him a tentative process.

The first is forged steel, reinforced steel bars, if they cannot be forged into steel, they are called iron bars!

The first thing to be determined for forging steel is whether it needs to achieve the effect of [-] steelmaking.

If so, according to the craftsman's speed, it may take two to three days for a steel billet to be formed, which is the result of continuous shifts and continuous forging.

However, the steel billet is not the final result. After obtaining the steel billet, it is necessary to find a way to process it into steel bars.

Liu Tan did some calculations. According to this efficiency, it takes about ten days to make two steel bars, and this is still when his requirements are not high, or there is no standard requirement for the steel bars at all.

Whether the steel bars forged in this way can be used is still a problem.

Liu Tan was very worried and asked them to build a steel bar to test its strength.

Then go back and think about how to improve the method of forging steel.

He himself doesn't know much about forged steel, but the historical development of forged steel has been written in history books.

So Liu Tan squatted in his study and began to recall history books bald.

Thanks to the many books he had memorized, he turned to the relevant records in the corner of his mind. One is mentioned in volume 72 of the Eastern Han Dynasty "Taiping Jing": Let the engineers hit the stone, ask for its iron, and burn it. Make it into water, and then make it into a good work, and then make it into Moxie.

This is the legendary steel frying method, adding concentrate powder into molten iron, and then repeatedly forging.

After Liu Tan wrote it down, he tore up the paper directly. This method was unreliable, and he still had to forge repeatedly. Although the number of times of forging might not be so many, Wan Duan still scared him.

He searched carefully in his mind for a long time, and finally remembered that there was a man named Qi Wu Huaiwen in history, who invented Su Tie.

The so-called Su Tie is also the product of steel pouring method.

Judging from the names, ordinary people can't tell which method is better, the method of frying steel and the method of pouring steel, and Liu Tan can't tell the difference either.

However, "Taiping Jing" is a work of the Eastern Han Dynasty, and Qi Wuhuaiwen is a person of the Southern and Northern Dynasties. Judging from the time, the Guangang method won.

Although the Eastern Han Dynasty to the Southern and Northern Dynasties have experienced chaos, but it is not enough to let the technology go backwards, right?

And Qi Wuhuaiwen's method of pouring steel is: burn raw iron essence, use heavy and soft collars, and several nights will make steel.

Translated into adult language, no, it is translated into words that everyone can understand. It is to smelt high-quality pig iron, then melt the pig iron to a liquid state, and then pour it on wrought iron. After several smelting, the pig iron can be turned into steel.

This process can be said to save a lot of effort. Wrought iron and pig iron are basically a process of interaction. The carbon of pig iron will penetrate into wrought iron, making wrought iron into steel, and pig iron will also become steel due to decarburization.

Then in the high temperature state, the impurities in the iron can be removed to improve the quality.

Now that the method has been thought of, the only thing that needs to be done is to experiment with the ratio of pig iron to wrought iron. The amount of carbon infiltrating and detaching should not be too much, too much will cause problems.

After Liu Tan locked himself in the study for three days, he finally achieved results. When he walked out of the study, he almost cried out of joy.

To be honest, he didn't work so hard in memorizing and dictating when he took the exam. How can I say that he needs to be the best teacher?

Liu Tan handed over the matter to the little eunuchs under his command who knew how to read, and specifically told them to pass on the above to the craftsmen, because if something went wrong in it, it would easily lead to the waste of previous efforts.

As for why he didn't go in person.

On the one hand, every time he went, Huo Guang would tell him about it. After a long time, he didn't want to go. He always felt that Huo Guang was so busy and had to worry about whether he did something that didn't meet his status. I'm sorry.

Anyway, after handing it over to the people below, Liu Tan went straight to find Gun Gun to play with.

When Liu Tan gets busy, he tends to forget to sleep and eat. Oh, yes, Huo Guang often worries about this.

Liu Tan thought about it, Huo Guang's country is really not easy.

Other princes and kingdoms can manage the affairs of a country well. The princes and kings can do whatever they want. will know?Or who will take care of it?Is Zhao Guoguo in charge?

However, when he came to him, Huo Guang still had to worry about his basic necessities, so he felt very embarrassed thinking about it.

I'm sorry, I'm sorry, but I still have to watch Gun Gun if I should.

Since Liu Tan asked someone to enrich Gun Gun's exclusive habitat, Gun Gun's mood has obviously become better.

There are small wooden horses, various suspension bridges, and trees for it to climb and play.

Huo Guang once asked: "You keep the iron-eating beast like this, aren't you afraid that it will lose its viciousness?"

Liu Tan also struggled with it at the time, but later he thought about it. He couldn't let Gun Gun go back to nature like this.

The northern border country does not have an environment in which it can survive. Isn't it waiting to die if it is released?

And ever since the day he took Gun Gun away, Gun Gun has become his pet in disguise. He promises that Gun Gun will have nothing to worry about, so why make Gun Gun aggressive?

The only thing to consider is whether to take Gun Gun back for a blind date when he grows up?

Thinking of this, Liu Tan felt that his old father was really worried about Gun Gun. He hadn't finished solving his own life-long affairs, and he still had to worry about Gun Gun.

Liu Tan couldn't help but think of Lu Xuan when he thought of the important events in his life. Since Lu Xuan left, there was no news for a few months. He began to think about whether to write a letter to Lu Xuan. Thoughts, but every time he feels that writing a letter on his own initiative is like hanging on to someone else, he has been hesitating.

Just when he was hesitating, he didn't know if he had too much understanding with Lu Xuan, so Lu Xuan wrote him a letter first.

Besides the letter, there is also a wooden box.

When Liu Tan took the wooden box, he couldn't help but feel a little strange when he heard the noise inside, so he didn't read the letter first, but opened the wooden box first.

After opening it, I saw a blood-stained golden crown of the Huns inside.