During the ancient Western Han Dynasty, the steelmaking method in China had been developed, and there was crucible steelmaking.

In the Eastern Han Dynasty, the steel frying method was invented, and the steelmaking method was actually very perfect at this time.

Counting the steel filling technology invented during the Northern and Southern Dynasties, the ancient Chinese invented almost all the technologies for the development of steel technology.

However, the bottleneck that constrained the development of steelmaking technology, the furnace temperature, was not solved by Westerners until the 18th century.

This also caused the East to lag behind the West for two hundred years after the eighteenth century.

The melting point of iron is 1538 degrees, but the temperature of ordinary flames is only a few hundred degrees, for example, the temperature of firewood burning is about 600 degrees, and the burning temperature of charcoal is less than 1,000 degrees in ordinary conditions.

In ancient times, through blowers, crucibles, and earthen kilns, the temperature was able to be raised to about 1,100 to 1,200 degrees, which was already the highest temperature.

This temperature state is already a limit and has not been crossed for thousands of years.

Without sophisticated technology, no chemical raw materials, and no advanced air refining technology, the furnace temperature would never exceed 1,200 degrees.

However, steel was already able to perform new molecular arrangements at temperatures of several hundred degrees, and when it burned red, it would become soft, giving the ancient craftsmen room to operate.

Without a heating room, Zhao Dezhao could not really melt the steel, even with the most expensive charcoal as fuel.

Of course, Pei Ge'an also knew this, and in the past half a month, she spent nearly 1,000 yuan on Zhao Dezhao, spent most of the remaining wealth of the East Palace, and purchased a large number of chemical raw materials.

Of course, people in this era do not understand what chemical industry is, and most of the purchases are ore raw materials.

There are also some dyes that were also purchased through Liu Xiao.

And most of the dyes of this era are toxins and chemical raw materials.

In contrast, buying pig iron from Kaifeng Mansion and pulling coal from Xinzheng is not the most expensive.

When Pei Ge'an left Zhao Dezhao's supervision, she let herself go a little, and when she saw each other again after half a month, she made four poisons that could directly poison a cow to death.

There is one biological poison in this, three mineral poisons, except for arsenic poison of arsenic, the other three are not found in this era.

made these things, and she seemed to be proudly showing off in front of Zhao Dezhao.

Zhao Dezhao has a headache, whose daughter-in-law is like this, thinking about killing people every day.

However, she did not waste time, and while creating four poisons, Pei Jia also transformed a new blacksmith according to her wishes.

This blacksmith room is not much different from the original, mainly because it has rebuilt a small high-temperature furnace inside.

This high-temperature furnace not only rebuilt the gas supply pipeline, replaced the crucible in the middle, but more importantly, transformed it into two combustion chambers.

Under such conditions, the furnace temperature can be raised to a theoretical level of 1,200 degrees.

At this time, although the iron does not melt into molten iron, it becomes sponge iron, which is easier to remove impurities than iron fired at a furnace temperature of several hundred degrees.

Moreover, Peggen also "invented" several co-solvents and additives.

Everything she did was in the name of Zhao Dezhao, and Pei Jia, Pei Feng and Pei Yun, father and son, did not dare to ask Zhao Dezhao at all, and would only act according to Pei Ge'an's orders.

As for Pei Mu and a few little guys, they ran away when they saw Zhao Dezhao getting up in fright.

After Zhao Dezhao arrived in Zhuangzi, he observed the stove, re-asked Pei Jia to transform the slag flow channel, and began the first round of heating.

This condition is already very good, thinking that the basic configuration is the best, because the demand is not large, Zhao Dezhao did not start refining from iron ore, but chose to buy pig iron directly.

If you do all the work of turning ore into pig iron, it will not be enough for everyone on the farm to use it.

With pig iron, turning it into mature iron, into steel, it is enough for only a few people.

The only thing that is more troublesome is carburizing, which requires absolute empirical skills.

In the common cognition, the carbon content is less than 0.25% is called low-carbon steel, 0.25 to 0.5 is medium carbon steel, and above 0.6 is high-carbon steel.

Within a reasonable range, the higher the carbon content, the harder the steel will be.

Of course, pay attention to reasonableness, if the carbon content is too high, it will be too brittle and turn into pig iron.

And if there is too little, it is not steel, but wrought iron.

There are many methods of carburizing, such as Pei Jia's mastery is that the upper layer is burned with charcoal, and the carbon molecules in the charcoal are naturally added.

But this method is a test of experience and luck, and it is a bit of a dependence on the weather.

Both Zhao Dezhao and Pei Ge'an mastered other better methods, such as the braised steel method, which was still common in later generations.

However, Zhao Dezhao and Pei Ge'an are both lazy people, and they are unwilling to work hard to observe by the stove by themselves, and then observe the degree of carburizing according to the iron slag that seeps out.

So after they taught Pei Jia the method, they began to play with mud and become carpenters.

The mud is the finest type of yellow mud dug from the nearby loess, and carpenters don't want to reveal what they want to do.

It took several days for the steel to come out of the two furnaces, and they were able to build a wooden base for repeating crossbow arrows.

Then the yellow clay is mixed with water to make two templates, and the base is printed on the two clay tablets.

After the clay mold has dried a little, the two templates are fixed together, and the degree of dislocation is observed by using a level between the two clay molds.

Although the base needs to be integrated to ensure strength, the demand for steel is not very high.

They were going to use copper, because the current furnace temperature was enough to melt copper with a melting point of less than 1,100 degrees.

After refining four furnaces of about two hundred catties of wrought iron, a crucible was replaced, and a bronze vessel brought by Zhao Dezhao from the East Palace was directly melted.

Of course, the first test failed, and the base from the elbow to the wrist needed to be integrated to ensure accuracy and accuracy, but the copper connecting rod was too thin, which led to breakage.

It's just a waste of a clay mold, and the copper can be used again.

I continued to experiment, and in the third time, I finally made a qualified base.

The base is divided into two parts, one part at the wrist and one part on the small arm, which can be directly attached to the arm and has an arc to wrap the arm.

In the front is the control system, which needs to continue to make several adjustment devices to control, and there are three arrow slots on the rear, which can install three steel pillar arrows within twenty centimeters.

From the wrist to the elbow, there is a copper pillar that is fixed and integrated, so that the steel arrow will not hurt you.

Because Pei Ge'an wanted to quench the poison, Zhao Dezhao had to be careful.

The range of steel arrows is not far, using cooked beef tendons to fire, the range will not exceed five meters, and it will have real lethality within three meters.

But this is enough, because this repeater is only for Pei Ge'an's self-defense.

The production of the controller took Zhou Zhen a week to complete, and these were not cast with clay molds, but with copper hammering, and the accuracy was difficult to control.

However, Zhao Dezhao was very satisfied with the controller that was manufactured, and the device, which can be wound by rotation, was mounted on the inside of the arm and positioned by a connected copper pillar.

It takes about five seconds to wind and two seconds to install a switch that combines three thin copper pillars.

Then put your wrist flat, clench your fist, and only need to retract your fist to touch the switch and fire the steel arrow.

Pei Ge'an liked this repeater that could be hidden in his clothes, so he asked Zhao Dezhao to make two sets, one on one arm.

After preparing equipment for his wife first, Zhao Dezhao began to prepare equipment for himself.

His equipment is simple, with only two horizontal knives, but these two horizontal knives need to be super hard.

The horizontal knife is the most accustomed weapon used by Zhao Dezhao, which was used for a hundred years in the Ming Dynasty, and he collected hundreds of various horizontal knives.

But now he doesn't have one, so he can only build it himself.

And his first imaginary enemy is Wang Jixun and Wang Santie, this person's current strength should be higher than that of him who has not yet fully grown up.

At such a time, if you want to kill him head-on, you not only need to be surprised, but also have a good weapon.

The horizontal knife is also a straight knife, and the scabbard can be made similar to the scabbard, and it will not appear out of order.

Later generations praised the status of the horizontal knife a bit high, but in the Tang Dynasty, it was the matching blade of low-level soldiers.

Generals generally only have a sword, and a sword that is neutral and peaceful is the weapon of the superior people.

Zhao Dezhao is a prince, and wearing a horizontal knife is a loss of honor and loss of face in this era.

The level of horizontal knife manufacturing in this era is also very poor, there is no hundred refining knives, and there is no wrapping knife refining method, which is ordinary iron.

Compared with the sword, the horizontal knife is thick-backed, so in order to save iron, it is now made less and less.

There are also a few in the East Palace, but they are afraid of cutting wood when they are used to cut wood.

In the Ming Dynasty, in order to cater to Zhao Dezhao's liking, all kinds of horizontal knife manufacturing methods were refined, and some even developed into the manufacturing standard of cold weapons.

Zhao Dezhao clearly remembers several kinds of methods, and under today's conditions, he is going to use the three-layer steel clad method of the cutter body.

In fact, to put it simply, the soft steel is wrapped in hard steel, so that the sword can achieve the advantages of outer hardness and inner toughness.

However, in order to achieve the best results, the hard steel of the back of the knife is different from the soft steel of the inner core, and the hard steel of the blade and the hard steel of the back of the knife are actually different.

This difference is not only the difference in quenching, but also the difference in the degree of carburizing.

Zhao Dezhao has been busy for Pei Ge'an for half a month, and this time it is her turn to work for Zhao Dezhao.

Precisely controlling different hardness, toughness, only she can achieve perfection.

Zhao Dezhao did not hide anything from Pei Jia, and told him the full set of techniques, plus Pei Feng and Pei Yun, several people discussed for a whole day before starting refining.

In the previous stage, Zhao Dezhao only struck iron and exercised his strength and endurance.

And Pei Gean has been studying her additives, constantly taking pieces of steel and testing them in the furnace to cool them down.

It can be seen that the Pei family is not only afraid of Zhao Dezhao now, but also their daughter and their sister.

Because she is completely different from before, an illiterate girl, now not only manages the eunuchs and guards under her command in order, but also reads and writes.

For a family that has not produced a single scholar in several lifetimes, the shock is extremely strong.

Of course, they will not think that this is a miracle, they will only think that it is taught by Zhao Dezhao.