Compared with cement, steelmaking requires higher technology, even if it is a small blast furnace, the ratio, catalyst, and temperature control, which requires a lot of time to study, and the ratio can be less than a suitable cement, which exists, but steel, impossible.

Looking at the development trajectory, it can be seen that although cement has not been produced much in China, but in the ancient Roman era, the early products of cement have appeared, and around the Common Era, more similar to modern cement can appear.

But steel, although occasionally from meteoric iron, or in the process of ironmaking, has some unexpected rigidity, and even some of it is outstanding, but the real period of modernization, in fact, was in the 18th century, and even the 19th century.

With the establishment of chemical and physical systems, with the level of science and technology reaching a certain level, and with the continuous improvement of war technology caused by war, the mass production of steel appeared, and steel also changed the war situation of the whole world.

Zhao Xin is a traverser, and has a card system, which can be said to be a combination of two anti-heaven artifacts, and how much power will burst out.

Zhao Xin believes that as long as he is given time to make the kind of super-labeled steel in later generations, it is almost impossible, and ordinary steel, stainless steel, and rebar are absolutely no problem.

To put it bluntly, the difference between steel and iron is the proportion of carbon content, the carbon content is between 0.2-0.4%, it is called steel, it has a lower melting point, hardness, corrosion resistance, is a natural good material.

Perhaps at the current level, it is more difficult to directly smelt steel, but in the Northern Song Dynasty, iron smelting has reached a good level, and wrought iron has also appeared.

It's a pity that it can't be carried out now, and there is no way to even the most basic experiments, the reason is very simple, Miaojiazhuang's current territory is too small, maybe you can get a cement kiln, a brick kiln or something like that, even if it is a small blast furnace for steelmaking, it will not work at all.

In fact, in history, Hebei is still a place where steel is produced, and in the entire Central Plains, it is relatively rare, and the taste is not very high, but the total amount is very large.

It's a pity that it's too close to the border, if it's just cement and bricks, if you don't understand what these things are used for, Liao won't care, but once it rises to steel, it will still produce tens of thousands of quintals at once, or even hundreds of thousands of quintals, which is terrible enough.

In the era of cold weapons, the output of steel was not as terrible as the era of thermal weapons, which directly determined the national strength of the country, but it was also quite powerful, how the Northern Song Dynasty had been fighting against the two countries on horseback in Liaoxi Xia under the premise of lacking horses, relying on excellent smelting technology and a large amount of iron.

Replaced by the Liao State and the Western Xia, with such a huge amount of iron, I am afraid they would have swept away a long time ago, as a nation on horseback, they are not short of horses, as long as there is enough iron, they can form a terrible heavy armored cavalry.

When the number of heavy armored cavalry exceeds 100,000, 500,000, or even 1 million, nothing can stop such a terrible torrent of steel in the entire era of cold weapons.

It's a pity, Zhao Xin put away the thoughts in his heart, iron and steel have become a bottleneck restricting the development of the fortress, but unfortunately there is no better change for the time being, and it can only come slowly.

If you can change the iron, so that the consumption of about 500 guan becomes 50 guan, or 100 guan, the cost of the entire fortress may be known to be less than 1000 guan.

This price is very terrible, when a thousand-mile horse is only 1000 guan, a tall, powerful fortress is only less than 1000 guan, which is very attractive for the Northern Song Dynasty and the whole status quo.

You must know that as long as the northwest opens the construction of fortresses, it is almost inevitable that it will be carried out on the border of Liaosong and Song, and it may be 2,000 or even 5,000 fortresses, even if one fortress is reduced by 500 guan, this will eventually be an astronomical number, 1 million guan, or even 2.5 million guan.

There are thousands of things, countless inventions and creations waiting for Zhao Xin to do, for the time being, he can only choose the fortress and the longbow, so the derived subsystems, brick kilns, cement kilns, and silk reeling.

The silk reeling is not prepared for brocade, but in order to better extract silk and make bowstrings, it is more towards the direction of the bowstring, with several simple angles, according to the length of the bowstring, divided into different scales, and if the machine is used to wind the silk, the efficiency is several times higher than that of a single person.

The reason why 1,200 sets of longbows can be sent to the front of the battle before the siege of Baozhou is that the role of this machine cannot be underestimated.

It's a pity that this is already the limit, if Zhao Xin is allowed to choose, he wants to choose a system with steel as the main body, and a thermal weapon combining gunpowder and steel is the direction of future development.

Although the longbow is powerful, it has not yet been born out of cold weapons, compared to ordinary archers, it is good in terms of sustained ability, and after special training, the durability will increase, but no matter how much it increases, it cannot exceed an hour.

Although it is said that the training of the longbow is easy to use, but if the number of leading archers is small, it is not easy to form combat effectiveness, the situation of the Northern Song Dynasty is that the number of archers itself is large, and it is relatively elite, as long as they can master the longbow in a short period of time, they can become the leading archers.

But if it weren't for the appearance of Sun Ji and others, the longbowmen of the group training would be a joke.

What is really easy to train, and can form long-term stable combat effectiveness, will always be only thermal weapons, in fact, on the premise of having some high-quality steel, as well as qualified gunpowder, at least arquebuses and some copper cannons, can be made.

But Zhao Xin was still hesitating, the longbow was an obvious advantage of the Northern Song Dynasty, but the artillery was not necessarily, the Northern Song Dynasty had the advantage of materials at most, and there were many materials for gunpowder, and there were really not many in the Northern Song Dynasty and even in China.

In the scope of Asia, carbon is negligible, where there is wood, charcoal can be burned, the whole world is more, the most sulfur is in the islands, Japan, and Taiwan, there is less saltpeter, that is, Southeast Asia, and Central Asia has some, and there are salt lakes in northwest China, but unfortunately those are controlled in the hands of Liao and Western Xia.

The deeper he went into this era, the more Zhao Xin felt a little constrained, in fact, through the present, four or five months have passed, and there are not many things he has really done, steamed buns, soap, longbow fortresses, and even the fortress is so easy to take out after the card system is lit.

If we say that we can not build it by means of construction, I am afraid that large-scale construction will attract attention, and it will lead to a mutiny launched in advance, and it will be really difficult to say when the time comes.

The enemy has been harassing, Zhao Xin has been passively defending, until now, there is still no end, the other party is impossible to let go of this opportunity for the supreme position of the throne, they will still act.

Although, with the card system, and now with the group training, Zhao Xin's hands have a force in his hands and have a preliminary ability to protect himself, but this can deal with everything.

The existence of the fortress has greatly strengthened the defensive force, as long as there is a fortress and 800 regiments to practice, even if there are tens of thousands of people, he can resist it, and he can't do it by counterkilling, within a year, if it is not captured, it is certain, and this security will be greatly increased.

This time also exposed the strength of the fortress, and in the future, when the fortress and the longbow were implemented in the Northern Song Dynasty, it was almost inevitable that those conspirators would know.

Zhao Xin also thought about the benefits to him if he hid this matter, but in the end he decided to promote it, the benefits of these two weapons to the Northern Song Dynasty are huge, and the sooner they are implemented, the better.

He has a sense of the overall situation and considers the overall situation, but will the other party think about it? It is conceivable that in order to attack and kill him, similar rebellions will appear, and they will become more and more intense, and in the eyes of the superiors, the people at the bottom, and even the safety of the country, are not something they can consider at all.

Even if the flood is monstrous after my death, in order to seize this supreme position, sell and sell the interests of the country, what is it, if I don't get the throne, everything is someone else's, who will I guarantee it.

This is exactly what Zhao Xin is most worried about, the Northern Song Dynasty is actually at the turning point of prosperity and weakness, although it is said that the founding of the country has not been long, and the contradictions in all aspects of the Northern Song Dynasty have not yet intensified to an irreconcilable place, but the external pressure has gradually emerged.

Since the establishment of the Northern Song Dynasty, there has not been much of a stop, in the early period, the Taizu period, in order to unify the whole country, fighting in the south, in the middle of Taizong and Zhenzong, and the Liao State struggled, there was the ambition of recovering the sixteen states of Yanyun, there was also the revenge of the Liao State, and there were many large-scale battles for the country.

In the late Zhenzong and Renzong periods, finally the Song and Liao dynasties stopped, but the Western Xia emerged again, at the beginning, it was just a border trouble, a small problem, but with the gradual rise of Yuan Hao, the genius commander and commander, all of a sudden won the three battles of the founding of the country, from a dispensable object, to a terrible existence affecting the northwest of the Northern Song Dynasty.

Wars are always destructive, and they may be gathered in ten years, or even in a hundred years, and the wealth they have gathered will be lost all at once.

Emperor Wu of the Han Dynasty bull bar, sealed the wolf Juxu, and beat the Huns all the way, but as a result, from the rule of Wenjing for decades, or even hundreds of years, the accumulated funds were swept away, and even the merchants who kept squeezing were laid a miracle, and even after that, there was nothing commendable in the entire Western Han Dynasty, until the Western Han Dynasty perished.

There is destruction in the prosperous era, which is really true for the Northern Song Dynasty, and after a few decades, why did Shenzong change the law, not because of the long-term war, which caused the emptiness of the treasury, but because of improper control, it completely buried the last vitality.

These conspirators, who can be recklessly crazy, and even get more and more serious, eventually trigger the peep of the Liao State and even the Western Xia, which he does not want to see, he must add strength and vitality to the Northern Song Dynasty, not destroy it.

At the same time, there was an opinion that he had to consider, and that was Renzong's opinion, and if he wanted to keep this identity, Renzong would never be able to get around it.