Although he called it steel bars, Liu Tan knew very well that the steel bars he could make now were completely different from the standard steel bars of later generations.
The current level of technology is completely unable to reach the standards of later generations, but even so, adding these things to the city walls can make them more solid.
To be honest, Liu Tan has come into contact with everything he has made before, no matter what it was, because of various interests.
He even made some of them himself, but things like steel bars were really beyond his knowledge.
The only thing he remembered was cold rolling and hot rolling, but as for how to roll... he didn't know.
Knowing nothing at all, the only thing he could do was to keep experimenting.
However, the national treasury was limited and certainly could not support such an experiment, so in the end Liu Tan decided to make the steel bars himself, sell the finished products to the court at a preferential price, and then pay taxes on the proceeds according to Han law.
This model was also the result of discussions between him and Huo Guang.
The first thing is to reduce treasury expenditure as much as possible. In fact, if Liu Tan takes the lead in paying taxes, then those who want to evade taxes will have to think about whether their abilities are greater than those of the King of the North.
In those days, the court's main income was guaranteed by taxes, and Huo Guang wanted to make Liu Tan a golden signboard.
Liu Tan also felt that this was a better approach. Should he gather all his blacksmiths to focus on the production of steel bars?
Although Liu Tan was a novice, the craftsmen under him were already experienced.
At least he had accumulated a lot of experience in forging the hundred-fold steel. Liu Tan first told them what kind of finished product they wanted, and then roughly explained the production process. This time the production process was really very simple. After all, Liu Tan didn't dare to talk about things he didn't understand.
After combining Liu Tan's description of the finished product and the production process, the craftsmen brainstormed directly and finally gave him a tentative process.
The first is forged steel, steel bars. If they cannot be forged into steel, they are called iron bars!
The first thing to determine when forging steel is whether it can achieve the effect of tempered steel a hundred times.
If so, according to the speed of the craftsmen, it may take two to three days to form a steel billet, and this is the result of continuous forging during shifts.
However, the steel billet is not the final result. After obtaining the steel billet, we still have to find a way to process it into steel bars.
Liu Tan calculated that at this efficiency, it would take about ten days to make two steel bars, and that was assuming his requirements were not high, or that there were no standard requirements for steel bars at all.
It is still a question whether the steel bars forged in this way can be used.
Liu Tan was very worried and asked them to make a steel bar first to test its strength.
Then I went back and thought about how I could improve the method of forging steel.
He himself didn't know much about forged steel, but history books had recorded the development of its history.
So Liu Tan squatted in his study and began to recall history books.
Thanks to the many books he had memorized, he finally found relevant records in the corner of his mind. One of them was mentioned in Volume 72 of "Taiping Jing" of the Eastern Han Dynasty: "The craftsman strikes the stone to get the iron, burns and smelts it to make it water. Then he asks a skilled craftsman to forge it thousands of times, and it becomes Moye."
This is the legendary steel-making method, which involves adding concentrate powder to the molten iron and then repeatedly forging it.
After writing it down, Liu Tan tore up the paper directly. This method was not reliable. He still had to forge it repeatedly. Although the number of forgings might not be that many, the thousands of forgings still scared him.
He searched carefully in his mind for a long time, and finally remembered that there was a man in history named Qi Wu Huaiwen who invented Su Tie.
The so-called iron is the product of the steel pouring method.
Judging from the names, most people cannot tell which method is better, the frying steel method or the pouring steel method, and Liu Tan cannot tell the difference either.
However, "Taiping Jing" was a work from the Eastern Han Dynasty, while Qi Wu Huaiwen lived in the Southern and Northern Dynasties. Judging from the time period, the steel pouring method wins.
Although China experienced the Five Barbarians' Invasion from the Eastern Han Dynasty to the Northern and Southern Dynasties, it shouldn't have caused technology to regress, right?
Qi Wu Huaiwen's method of pouring steel is to burn the pig iron and use it to make a heavy and soft ingot, and then it will become steel after several nights.
Translated into human language, no, translated into words that everyone can understand, it means smelting high-quality pig iron, then melting the pig iron into liquid, and then pouring it on wrought iron. After several smeltings, the pig iron can become 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 in pig iron will penetrate into the wrought iron, turning the wrought iron into steel, and the pig iron will also become steel due to decarbonization.
Then, under high temperature conditions, impurities in the iron can be removed to improve the quality.
Now that we have thought of a method, the only thing we need to do is to experiment with the ratio of pig iron and wrought iron. The carbon that penetrates and escapes cannot be too much, as too much can easily cause problems.
After Liu Tan locked himself in the study for three days, he finally achieved some results. When he walked out of the study, he almost cried with joy.
To be honest, he didn't study so hard when he was memorizing and reciting the text during the exam. How can I say that he needs the best teacher?
Liu Tan handed the matter over to his young eunuchs who could read, and specifically instructed them to convey the above instructions to the craftsmen, because if there was any problem, all the previous work would be wasted.
As for why he didn't go in person.
On the one hand, every time he went there, Huo Guang would nag him. After a long time, he didn't want to go anymore. He always felt that Huo Guang was so busy, but he still had to worry every day about whether he had done anything that was inconsistent with his status. He felt very sorry about it.
Anyway, after handing it over to his subordinates, Liu Tan went straight to play with Gun Gun.
When Liu Tan gets busy, he tends to neglect his sleep and food. Oh, yes, Huo Guang is also often worried about this.
Liu Tan thought that it was really not easy for Huo Guang to be the prime minister.
In other vassal states, the prime ministers were solely responsible for managing their respective national affairs. The princes were free to do whatever they pleased. But Zhao's crown prince, Liu Dan, was a womanizer, even to the point of sexually abusing his own daughters and sisters. If Jiang Chong hadn't reported it, who would have known about it? Or who would have intervened? Did the prime minister of Zhao intervene?
However, when it came to him, Huo Guang still had to worry about his food, clothing, housing and transportation, which made him feel particularly embarrassed.
Even though I feel embarrassed, I still have to go and see Gun Gun.
Ever since Liu Tan had people enrich GunGun's exclusive habitat, GunGun has obviously been in a better mood.
There are small wooden horses, various suspension bridges, and trees for it to climb and play.
Huo Guang once asked, "If you keep the iron-eating beast like this, aren't you afraid that its vicious nature will disappear?"
Liu Tan was also conflicted at the time, but later he came to his senses. He knew that it was impossible for him to release GunGun back into the wild in this condition.
There is no environment for it to survive in the Northern Territory. Wouldn't it be dead if it was released?
And since the day he took GunGun away, GunGun has become his pet in disguise. He just needs to ensure that GunGun has food and clothing, so why should he let GunGun become vicious?
The only thing we need to consider is whether to take GunGun home for a blind date when he grows up?
When Liu Tan thought of this, he felt that as an old father, he was really worried about Gungun. He hadn't solved his own life-long affairs yet, but he still had to worry about Gungun.
When Liu Tan thought about his lifelong event, he couldn't help but think of Lu Xuan. Since Lu Xuan passed away, there was no news for several months. He began to think about whether he should write a letter to Lu Xuan. In fact, he had this idea before, but every time he felt that writing a letter on his own initiative would be like keeping the other person hanging, so he kept hesitating.
Just when he was hesitating, perhaps because he and Lu Xuan were too closely connected, Lu Xuan wrote him a letter first.
In addition to the letter, there was also a wooden box.
When Liu Tan took the wooden box, he heard a noise coming from inside and felt a little strange. He did not read the letter first, but opened the wooden box first.
After opening it, he saw a blood-stained Hun golden crown inside.
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