"Sir, I'll go to sleep first."

After fishing all night, Cao Jie really couldn't stand it.

In normal times, Cao Jie usually goes to bed very early, and now he almost stays up all night.

Except for the fish of more than 20 catties that I caught before, there was no gain.

"Okay, I'll fish for a while."

Lin Chuan talked to himself while looking at the calm river.

In the middle of the night, the water of the Yangtze River seems to have rested, and it is no longer as turbulent as during the day.

Except, of course, on rainy days.

After Cao Jie left, Lin Chuan turned around and came to a hut by the river.

In the hut, there was a huge machine, made of stainless steel, so huge that a dozen people might not be able to carry it.

This thing is the steelmaking furnace.

Although there were drawings in the system mall, Lin Chuan naturally had no way to use the resources at hand to make such an exquisite machine.

There are no metals in the mine, most of them are some salt and other minerals, and only a very small part of the iron ore.

But fortunately, in the system mall, you can directly exchange farming points for one.

This thing was changed out after Lin Chuan had saved up farming points for half a year.

At that time, Lin Chuan was used to make kitchen knives.

Most of the damp and dry places on the island are filled with grain, salt and sugar, and there is no place to put kitchen knives at all.

Kitchen knives made of iron are basically easy to rust, and only kitchen knives made of steel can be used.

Not only kitchen knives, but also pots and pans need to use steel.

With a steelmaking furnace, it's much simpler.

The whole body of this steelmaking furnace is like a gourd, thin at the top and thick at the bottom, with various small holes around it.

Pig iron is heated to 1,300 degrees Celsius at a high temperature and then turned into a liquid, which is poured into the furnace and then put in quicklime.

Then after a series of reactions, it is constantly puffed up, so that it becomes steel.

This is known as the steel filling method.

The steel filling method was invented in the Northern Qi Dynasty, and then it was continuously modified by later generations, and the machine given by the system was a modern streamlined and improved version.

It's very easy to use, and it's relatively simple when you have a manual.

With this steelmaking furnace, if the steel filling method is adopted, it can easily produce 10,000 catties of steel in a day.

Of course, Lin Chuan didn't have so much iron, and he couldn't use so much steel.

Steelmaking is a very tedious thing, and it is extremely hot, and Lin Chuan can't stand it in the summer.

As long as the steel smelted was enough, Lin Chuan made them into daily utensils according to the drawings.

Subsequently, the furnace was left unused.

Now that Lin Chuan knows that he is in the Three Kingdoms, this thing has a place to use again.

During the Three Kingdoms period, although there was already a steel frying method, compared with the steel filling method, the efficiency and output were far from comparable.

Therefore, during the Three Kingdoms period, most of the people used pig iron to build weapons.

It's just outrageous.

Pig iron is not only susceptible to rust, but also far less tough than 100 steel.

If the steel filling method is implemented, it will undoubtedly be a dimensionality reduction blow to other princes or foreign races.

The princes all used iron swords, and those aliens, some of whom could not even cast iron.

Since Cheng Yu asked Lin Chuan about this, Lin Chuan had this idea.

With the steel-making furnace, the future Great Wei will inevitably be invincible in land warfare.

Pig iron swords and steel swords are simply not of the same grade.

But there is still a limit to what Cao Cao can do.

After all, the ability of the ancients to mine materials is far inferior to that of their descendants, and there is no machine assistance, and they all rely on one hand to dig, and many minerals cannot be mined at all.

However, since iron ore can be mined, it is enough for now.

……

The next day, Lin Chuan heard the sound of a boat approaching early in the morning and took Cao Jie to the beach.

Sure enough, Lao Cao came.

"Boy, Jie'er, how are you doing during this time?"

When Cao Cao saw Lin Chuan, he immediately shushed and warmed up.

It's just that Lin Chuan always feels that Lao Cao's eyes are a little strange when they look at him and Cao Jie.

Lonely men and widows live on the same island, and if nothing happens, the ghost will believe!

Of course, these are secondary.

After some chatting, Cao Cao quickly got to the point and said the current situation.

"Young man, is it true that the daily output of 10,000 catties of steel?"

Cao Chun couldn't help but ask.

He held back all the way to this matter.

The importance of steel, as a military general, Cao Chunke knows too well, if he can really achieve a daily output of 10,000 catties, it is enough to solve the urgent need.

"Ten thousand catties? Pretty much. ”

Lin Chuan said as he led everyone to the steelmaking furnace:

"With this thing, coupled with the method of filling steel, if you keep refining all day long, it will be easy to get ten thousand catties."

"It's just that you need more iron and quicklime."

Lin Chuan said as he handed the detailed drawings of the steel filling method that had been prepared long ago to Cao Cao and the others.

Lin Chuan can't write official letters, and everyone really can't read them.

In desperation, Lin Chuan had to dictate and convey it, which was recorded by Cheng Yu.

"It's so easy to make steel?"

Hearing Lin Chuan's words, Cao Cao couldn't believe it.

He originally thought that Lin Chuan was going to use immortal magic to make it, but he didn't expect the method to be so simple.

If you teach this to a craftsman, you can learn it in a day or so.

"Simple is simple, but a steelmaking furnace is not enough."

"If you take it back, the first thing you have to do is make it in large quantities."

"This furnace is made of steel, and when the first batch of steel is made, these furnaces should be built first."

"Without a stove, everything is in vain."

Lin Chuan shrugged his shoulders and handed the drawings of the steelmaking furnace to Cao Cao.

I really can't build it by myself, and I don't have enough resources.

But Cao Cao is different.

Cao Cao controls almost all the resources of the Central Plains, and the iron is absolutely sufficient, and there are many craftsmen under his command, all of whom specialize in crafting weapons and armor.

With the help of these people, whether it is steelmaking or mining, the efficiency is obviously stronger than Lin Chuan alone.

Although Lin Chuan has a lot of modern knowledge and systematic blessings, he can't compare with these craftsmen in this profession at all.

Knowing what it means and knowing what it means are two different things.

"Thank you, immortals! With such a divine object, I can definitely take down Ma Teng! ”

Cao Cao was immediately excited.

Lin Chuan has helped a lot.

If the tiger and leopard cavalry and other cavalry were alone, I am afraid that they might not be able to withstand the cavalry army assembled by Ma Teng.

First of all, horses are far inferior to others.

If the weapons and armor can't be crushed, plus the threat of other princes, it's really hard to say.

The main thing is not that Cao Cao can't beat him, but that he doesn't want to fight at all now.

If there is a war, then the work will inevitably be put on hold.

If no one cares about the immortal food, it is no different from nothing.

What Cao Cao has to do now is to survive these three months, and when the potatoes and other grains are ripe, he can get out of the customs.