The steward looked at Su Jinli puzzled, wondering why she was unhappy.

"Mr. Su, do you think there's something wrong?" The steward asked hesitantly, then picked up the scythe again, "Actually, this knife is very good, and it is much easier than the previous method." ”

Of course, Su Jinli was not satisfied.

She thought for a while and said, "Let's continue to make iron, burn a few more furnaces, and control the time when the time comes, and see what the difference is in the iron obtained by different frying times." ”

With that, she walked out.

This ironworks is still quite large, and more than one blast furnace has been built.

However, there is more than just a blast furnace in this place.

When Su Jinli asked people to build an iron-making workshop before, she made preparations, in addition to the blast furnace used for iron-making, she also asked people to build some open-hearth furnaces.

However, this kind of open-hearth furnace is not the more advanced iron-making open-hearth furnace of later generations.

Rather, it is an economical and convenient stove.

To put it simply, it is to dig a rectangular pit in the ground, about half a meter deep.

The inner walls of the pit are then coated with a finger-thick layer of refractory clay.

When the official fire is opened, a vaulted roof is covered with refractory bricks on top.

The inside of the brick should also be coated with refractory mud, and the outside should be coated with a thick layer of mixed grass mud.

Vents and ignition holes were dug out on the sides, and a simple stove was made.

However, when this furnace makes iron, it does not directly put the raw materials into it, but first knocks the processed raw materials into the crucible, so it is also called crucible ironmaking.

If handled well, it can even be made directly.

What Su Jinli plans to refine is steel.

If you make iron directly, it will be too laborious, and it is better to use a blast furnace to make iron.

The steel smelted by this method can get molten steel, as long as the crucible is taken out in time, it can be directly cast and formed, which is much easier.

If you want to take molten steel, it must be a little dangerous.

It was still burning at that time.

After the molten steel cools, it can also be taken down, but in that case, if you want to take out the cooled ingot, you have to break the crucible, which is too laborious.

To make steel, the temperature must reach 1,600 degrees.

With such a high temperature, the material used to make the crucible cannot be ordinary, otherwise it will not be able to withstand the high temperature.

And there is also a defect in the use of crucibles, that is, the yield is too low.

Of course, this low yield also depends on what it is compared to.

If you can directly smelt naïve molten steel, the efficiency will definitely be much higher than the efficiency of the imperial court's current steelmaking!

Speaking of which, she hadn't seen the Su family for a long time.

If they can really make steel, maybe they can make a few matching knives.

However, the matter of crafting weapons is a little more sensitive, so it would be better for her to ask for advice first.

Thinking of this, Su Jinli couldn't help but laugh again.

It's too early to say this, and her molten steel hasn't been refined yet.

So, let's make steel first.

Su Jinli first went to inspect the crucibles that had been prepared a long time ago, and felt that they all looked quite strong.

It's just that whether this crucible will work or not can only be known after refining.

Su Jinli asked people to put the crushed raw materials into the crucible according to the recipe, and then sealed them one by one.

He also had some broken bricks and tiles spread on the bottom of the stove to facilitate ventilation.

In order for the furnace to burn adequately, there must be enough oxygen, so it must be ventilated. Otherwise, if there is not enough oxygen, it will not be burned sufficiently, which will affect the temperature of the furnace and waste fuel.

After the pieces and tiles were laid, Su Jinli had the coke spread in again, and then the sealed crucible was neatly placed.

When the crucible was set, another layer of coke was placed on top of it, and the whole stove was stuffed to the brim.

Only then did the bricks begin to make the vault.

At this time, the sky also darkened.

Su Jinli simply went back to the Qin Palace, planning to go again the next day.

The bricks had just been laid, but they were still wet, and they couldn't be lit right away, so they had to wait until they were dry tomorrow.

Anyway, the blast furnace has already started to make iron, so there is no need to rush it.

So Su Jinli went back with peace of mind, and before leaving, he also told the craftsmen to rest well and nourish their spirits.

On the other hand, the steward could not rest.

He first arranged for craftsmen to keep an eye on the iron-making furnace, and then he couldn't wait to enter the palace and find Liu Fang from the War Bureau.

Pig iron is a good method, but it is not clear whether it can be used to make blades, he has to go and talk to Liu Fang, and let Liu Fang quickly arrange for a blacksmith to try!

If it does, it will be much easier in the future!

However, he also knew that the blade created in this way was definitely not a treasure sword.

But as long as you can match the lower-level soldiers, that's a great thing!

God knows, there are too many soldiers, and the knives used by the soldiers at the bottom are all curly blades. Even if it is grinded, it will not be used.

If you can use this method to repair and solve the weapon problem of the low-level soldiers, it will definitely be a great achievement!

When the steward thought of this, his heart beat so fast that he walked as if he were stepping on cotton.

In a hurry, he went on horseback.

However, when I arrived at the gate of the palace, I couldn't ride in, so I could only walk in.

With his status, he is not yet qualified to ride a horse in the palace.

So after entering the palace gate, he trotted all the way to the military battle.

Liu Fang knew about the ironworks, and was shocked when she saw the steward.

He got up from his chair and asked in surprise, "Why are you here?" But what happened to the ironworks? ”

After speaking, he saw that the steward was panting, so he quickly pulled him to sit on a chair, and urged someone to bring him tea.

Give him all the tea in person: "Hurry up and take a sip, moisten your throat, and see what you are panting." ”

The steward poured a big sip of tea into it, and then couldn't wait to say, "Grandpa Liu, have you ever heard of pig iron shower?" ”

"Pig iron...... Drenching? Liu Fang was stunned for a moment, and then his face changed, "Today, the ironworks started to make iron, did you use this method?" ”

Liu Fang, as the palm seal eunuch of the War Bureau, knows how to smelt iron.

So as soon as he heard these four words, he realized the mystery in them.

In the past, steel-filled steel-making was used, and pig iron was used in this steel-filled method!

The steward nodded, and then said quickly: "It's what Mr. Su said!" He had a sickle made, which was burned red in the furnace, melted the pig iron, and quickly sprinkled it on the edge!

The whole process is very short, just a blink of an eye. Then the edge of the sickle is rubbed with pig iron juice, and when the sickle is a little colder, it begins to quench and sharpen the edge.

That's it...... In such a simple process, the scythe that came out of the blade was actually very sharp. That's a farm tool! I had someone try it with the pork with the skin, and it was easy to cut it! ”

The more Liu Fang listened, the brighter her eyes became.

He couldn't wait to ask, "You said you could bring the scythe?" Take a look at us! ”

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