"Burn pig iron fine, heavy and soft collar, and several nights will become steel."

This is Li Chengyang's fifteen-day record, such as holding the book that I don't know when, Li Chengyang is full of excitement.

This is the method of steel, and the person who invented this method is called Qi Wuhuaiwen, who was a famous iron-making expert during the Northern and Southern Dynasties.

And these few words are his pinnacle.

Steel-filled method!

The principle is very simple, that is, to fire high-quality pig iron, then pour it on wrought iron, smelt and heat it repeatedly, and then you can get steel.

It's very simple, Li Chengyang even began to wonder if his IQ was eaten by dogs.

Pig iron has a large carbon content and wrought iron has a small carbon content.

The carbon content of steel is in the middle of pig iron and wrought iron.

Mix the two things, and the steel will come out, right?

Such a simple truth, why did I never think of it.

He slapped his head with the book, and quickly looked to see if the book was damaged.

This is a treasure, and it can't be lost casually.

I hurriedly walked out of the library building, and when I walked out, I looked back and looked deeply.

Remember the nightmarish scene of fifteen days, and he will not set foot in this building again if he is killed.

In the past fifteen days, he has almost flipped through all the books, except for the subset of the classics and the subsets of the classics, which are mixed with a small number of history books, and as for the books about the craft, he has not seen a single one.

Just when he wanted to give up, the officials who managed the library gave him new hope.

There was also a box of books left next door, no one had touched it for many years, and since the prince had searched for fifteen days and had not found the target, he might be able to try his luck there.

Then Li Chengyang turned out this divine book from the thick dust and dense cobwebs.

It's tears to think about, such an important thing is casually thrown aside, fortunately this is the royal library, if it is changed to ordinary people's homes, I am afraid that the box of books will be used as toilet paper.

I left the palace with great interest and came to the Ministry of Industry.

Wu Li didn't know when he had been released, and he was still in that small courtyard.

"Yo, Lao Wu, when will you come back, don't let me know", Li Chengyang greeted him eagerly.

Wu Li waved his hand indifferently: "They are all old men who follow His Majesty, what can happen, they will come out after staying there for a few days."

"That's right, I've just found a way to make steel, and I'm worried about what to do if I can't find you, since you're here, let's continue to experiment", Li Chengyang shook the book in his hand and said to Wu Li.

As soon as the words fell, Wu Li's legs weakened, and he sat on the ground with a plop.

"Your Highness, you better go find someone else, I really can't get this", Wu Li sat on the ground, didn't even bother to get up, and shook his head again and again.

Li Chengyang took a few steps forward and helped the person up: "How is it, are you okay?" ”。

When he walked in front of Wu Li, he found that Wu Li's eyes had obvious dark circles, and the whole person looked sluggish.

"How can my father do this to you? No, I'll just go to him to reason", Li Chengyang was anxious when he saw it, this must have been tossed by Li Shimin, otherwise he would have become so haggard.

Wu Li is his old man, since he entered the palace, Wu Li has been by his side, and now that he has been wronged, how can Li Chengyang not care.

Wu Li hurriedly grabbed Li Chengyang and explained.

This is not Li Shimin's reason, it is all Wu Li's own fault.

As an old man under Li Yuan, an old courtier who has made great contributions to the Tang Dynasty, Li Shimin is naturally not easy to slacken.

However, it is also because as an old minister, he must consciously share his worries with Li Shimin, and Wu Li still has this awareness.

So when Li Shimin asked him about his plans, Wu Li immediately rejected the idea of teaching iron-making technology to others, and took up the iron-making matter himself.

With more than a dozen people handed over to him by Li Shimin, he practiced iron in a hidden place day and night.

has to return to the Ministry of Industry from time to time to preside over the overall situation, so he has Wu Li's haggard appearance.

"Wouldn't you just give this technology to those people, can you use it alone?" asked Li Chengyang puzzled.

Wu Li shook his head: "Who knows where those people came from, I can't trust them, this kind of thing is still safe first."

Li Chengyang nodded, Wu Li's consciousness made him a little ashamed, he was worthy of being an old minister, and he put safety first in everything.

"But Your Highness, don't make some good things, I'm tired enough to make iron alone, and if I come to a few more people, my old life may have to be explained," Wu Li said with a bitter face.

Li Shimin sent him more than a dozen people, all of whom he used to do coolies, as long as it involved technical matters, he did it himself, and it was really tiring.

Now when I see Li Chengyang, his legs and stomach are trembling all the time.

Li Chengyang is not easy to persuade, you can't treat people as animals, steelmaking is definitely a more important thing than ironmaking, if Wu Li learns it again, it can also cost people's lives.

Besides, Li Shimin can't let Li Shimin know about this, and if Li Shimin knows, he will definitely take it all away.

At that time, the training of steel must be the main equipment of the guards first, and there can be anything to do with him Li Chengyang.

The matter of steelmaking will be put aside first, today is already the sixteenth day, and presumably all the coal mines in Datang have been collected.

Except for places that are too far away, there are no people in the far places, and there is nowhere to sell the coal mine.

Now that you have the title deeds, is it time to get down to business?

Let Wu Li go to rest for a while, and Li Chengyang turned the Ministry of Industry around.

He was satisfied with the fact that the warehouse of the Ministry of Industry was full of coal stoves.

It seems that the people who have announced it in the past ten days have not been lazy for a day.

Moved out and looked at it, a simple cast iron sheet, a thin layer, and a thick layer of furnace tiles inside.

This is still designed by Li Chengyang with reference to the tiles in the palace, which is heat-insulated, cheap, and heat-resistant, and is a good thing for a coal stove.

Below are three brackets, I don't know what they are made of, they look very sturdy.

I carried it, it was a little heavy, and it was estimated that there were twenty or thirty pounds.

But it doesn't matter, ordinary people who carry a stove and run out every day.

The most important smoke exhaust pipe is also made of iron sheets, which makes Li Chengyang pout.

Originally planned to use ceramics to make pipes, but who knew that he had discovered a new iron-making method, and now Datang is no longer short of iron, and this is directly made of iron.

And by the way, there's a kettle, the kind that fits perfectly with the coal stove.

The style is exactly the same as the teapot, and it is almost indistinguishable from the later generations.

Not bad, everything is ready, only the east wind is owed.

Carrying a coal stove and a kettle, he went out of the Ministry of Works, preparing to bring this thing to Li Shimin to see.

When I came to the palace, I went directly to Li Shimin's study.

What is surprising is that today's study is already full of ministers.

Li Chengyang kicked the door open with a coal stove and a kettle, and more than a dozen pairs of eyes swooped over, and Qin Qiong, who reacted the fastest, had already pulled out half of the sword on his waist.

"Hehe, hello uncles and uncles, the boy has given you a few gifts", put down the coal stove and kettle, and saluted one by one.

"Prince, what are you doing here?" , Li Shimin, who was sitting in the middle, had a black line on his face.

Li Chengyang pushed the coal stove behind him forward: "The coal stove is built, and I specially brought it over for my father to experience it."

"Oh", the eldest grandson Wuji on the side patted his belly: "Your Majesty, this is the tool specially used to solve charcoal poison?" There are just a few of you here, so why don't you take this opportunity to let you all know."

Li Shimin nodded: "Let's take a look together, you have been discussing the issue of coal taxation for half a month, and you have never been able to unify, now it is just a good time to take a look at this real thing, and then think about whether my words are reliable."

Problems with the tax system? Why hasn't it been discussed for so many days, but it's not about Li Chengyang.

He put the coal stove outside the house and sent a few people to fetch some honeycomb coal from his east palace.

In the past few days, he has also taken a little time to make some honeycomb coal, which is enough for testing.

It didn't take long for the first honeycomb coal to burn.

Li Chengyang put the four pieces of coal into the coal stove in turn, moved the coal stove into the study, and arranged the chimney by the way.

Clapped his hands: "Okay, it's okay now, just wait for him to burn, father, uncles, the kid will go back to the East Palace."

"Slow", Li Shimin said: "Since you came, don't go, if you want to talk about the understanding of coal, you are still the best, and then you will introduce it."

Li Chengyang nodded, took in a piece of honeycomb coal from outside, and introduced it while displaying:

"This thing, burning slowly, high in calories, cheaper than charcoal or even firewood, anyone can afford it, and my current plan is to sell ten pieces of coal like this for a penny, and these ten pieces of coal are enough for a family to use for two days."

Don't talk anymore?

"Gone?" Lao Cheng hurriedly asked.

Li Chengyang nodded, his eyes full of doubts: "It's gone, it's cheap, the effect is good, with him, there will be almost no people in the world who freeze to death, it's as simple as that."

Li Shimin nodded with satisfaction, looked at the stunned ministers and gave Li Chengyang a thumbs up in his heart.

Isn't it just a matter of collecting taxes, pulling the country's capital, and competing with the people for profit.

In the final analysis, I just don't want to come forward to carry this pot, and it's useless to talk about anything else.

Whoever says that they want to collect taxes is indirectly on the bar with the family, especially if they are not careful.

Now Li Chengyang is a child who has simplified things.

A good thing for the benefit of the country and the people, are they still embarrassed to shirk it?

The ministers looked at each other and smiled bitterly, they were all pulling skin before, biting the excuse that they didn't understand coal clearly and couldn't make a decision easily.

Now there are no excuses.

Coal stoves and coal had already appeared in front of him, and the crown prince himself endorsed it in front of His Majesty, saying the benefits of coal.

If they continue to pretend to be confused, it will be a bit too much.

"I think that such a good thing should be taxed, and it can't be less than 50% tax", Lao Cheng was the first to open his mouth and stretched out a black slap for a while.

"Don't joke about Zhijie, the old man thinks that two achievements are enough", Fang Xuanling touched his beard and said.

"Once it becomes good, it is not advisable to tax heavily".

"No, thirty percent is enough, you each take a step back".

“……”。

As Cheng Biting Jin spoke, there was chaos in the study all of a sudden.

Li Shimin secretly gave Li Chengyang a thumbs up, and watched with interest as the ministers in front of him turned the study into a vegetable market.

Li Chengyang found a blanket and sat down, leaning on the pillar, taking advantage of the temperature of the coal stove, and fell asleep after a while.

When he didn't know who was shaking him awake, everyone in front of him was pointing three fingers at Li Shimin.

looked at it in a daze, and suddenly got a kick.

turned his head and saw Lao Cheng staring at him, gesturing at himself.

Li Chengyang hesitated and stretched out three fingers, and Lao Cheng leaked a satisfied smile.

"Okay", suddenly, Li Shimin in front slapped the table: "Since the prince and the ministers have decided, then collect thirty percent, okay, you all go back, Xuan Ling, you still have to trouble and draft an edict for me."