Seeing the craftsman taking the fried steel from the steel outlet, almost completely liquid, Sun Chengping took a breath and said to his son: "The steel we fried in, all of them were like bean dregs, and there were a lot of impurities in it. Unexpectedly, the steel in this stove was actually water. This item alone was much better than us. Needless to say, you must be energetic today and you must look a little. When the matter is over, immediately change our stove to this one. It is nothing to work here for a few days and earning three or five jin of money. After learning this, you will benefit for life!"

The three sons said they were all divided into their own labor and each of them studied several positions.

Du Zhongxiao did not stop it. This technology must spread out and benefit the people. This is an official industry, not his own family, so there is no need for Du Zhongxiao to engage in any technological blockade. When the entire industry develops, it will benefit both the country and the people.

The steel was released from the furnace and poured into the prepared specimen, which condensed into steel ingots and steel strips. Because the steel produced was pure, it could be sold according to the standards of stir-frying steel in this area. However, there were prepared forging hammers there. When the steel condensed and was still red, the craftsman was pinched to the anvil. Tao Shiqi went to take the pin of the hydraulic forging hammer, and the huge forging hammer started to move.

Seeing sparks splashing on the anvil, Tao Shiqi said to his eldest son beside him: "This is something we can never do. The pair of forging hammers here can be as good as dozens of people working together, which is extremely powerful. Unfortunately, ordinary households cannot build dams to block the water."

Sun Dalang shook his head unfortunately. The official controls the river reservoirs very strictly and prohibits households from building dams.

Du Zhongxiao went to the edge of the forging hammer and watched the red iron block slowly flatten and square again, and the color gradually darkened. During this process, the impurities inside were squeezed out and turned into residues and fell to the ground. After this processing, there was no need to heat it twice, and the processing was repeated, and the effect was excellent.

On the other side, several craftsmen clamped the steel bars in the field and surrounded a hydraulic forging hammer. They were thinned in an orderly manner little by little, and slowly processed them into steel strips. During the thinning process, the impurities inside were removed. The red gradually faded and turned blue-black.

Tao Shiqi said: "Officials, I don't know what will happen if I take this made steel belt directly to make a knife? The shape is regular and it takes a lot of effort."

Du Zhongxiao smiled and said, "What comes out of the furnace is cooked iron. How to make swords? You have to make swords and swords, and you have to refine them to quench them."

With the current knowledge base, Du Zhongxiao couldn't explain clearly that the hard iron was low carbon steel and could not be hardened. To make a sword, even if the iron was pure, it would have to be tempered several times and carburized again, so that the blade could be quenched and reached the required hardness.

Because the iron is too soft, it is not very useful. Moreover, due to insufficient carbon content, it cannot be hardened, whether it is making swords or making agricultural tools, it is not qualified. The surface of the carburization is to burn red in the charcoal fire, forging, and finally quench it. During this process, a large amount of iron will be consumed. For those who do not understand the principle, they often mistakenly think that there is iron essence, or real iron and fake iron. In fact, the purer the iron, the more complicated the subsequent processing of the tool, the lower the efficiency of the simple surface carburization, and there is neither iron essence nor steel essence.

At this time, the benefits of the crucible steel making method are revealed. Using pig iron directly and together with these pure cooked iron, the tool steel for making medium and high carbon steel consumes very little. Therefore, although the cost of crucible steel making is relatively high, it is still profitable compared to the general processing method.

The most popular thing now is actually steel filling. It is to use the melting point of pig iron to be lower than that of braised iron, and after sealing, the pig iron is heated first, and penetrate into the braised iron to achieve the purpose of increasing the carbon content. Steel is iron with a carbon content between pig iron and braised iron. The combination of pig iron and braised iron can be just enough to make steel. This is the most popular method. Most swords in the army are made of this method.

When Du Zhongxiao was in Yongcheng, he tried another method. He made a farm tool with cooked iron, then melted pig iron, poured on the made farm tool, and then quenched. This method is simple and easy to use, and after being used for a long time, the steel on the blade can be easily repaired after being worn off. Making a steel blade by pouring pig iron is the lowest cost and the easiest method.

Crucible steel is made of high-quality tool steel, while poured steel is medium-sized steel used for large batches of swords. Craft iron is poured into pig iron, so it can make low-cost iron products for agricultural tools. Du Zhongxiao has already planned the use of the iron produced by Datong Prison, but it will take time to promote it.

Du Zhongxiao instructed the craftsmen to put the prepared steel strip on the fire and burn it dark red again. Then, the steel rollers on one side were opened and put them in piece by piece. The steel strip was driven by the steel rollers and slowly advanced. According to the gaps between the steel rollers, they were slowly rolled into steel plates of uniform thickness.

Tao Shiqi followed Du Zhongxiao, watched the steel plates form, and smiled and said, "It's amazing! In just a while, the cast iron over there became one piece of steel plates. However, official, what's the use of these steel plates? If you make a hoe, a shovel, and a steel bar are enough."

Du Zhongxiao smiled and said, "A simple use can be used to make armor. By the way, why haven't Shisanlang seen these days? His body grew up and he had another good strength. He would wear a pair of steel armor and wear it with great strength. He would definitely be powerful."

Tao Shiqi said: "Since I arrived at Datongjian, I have followed the instructions of the officials and checked around with Chen Qin. The mountains are connected here, and many smelters are in the mountains, and they have not finished checking them for so many days. - Officials, if this can make steel armor, I will make a pair of them."

Du Zhongxiao laughed when he heard this: "Can you wear your body?"

These steel plates are evenly thick, and they can already use the water conservancy forging hammers there to make steel armor. If you are interested, it is not difficult to make the full-body plate armor that Du Zhongxiao saw in his previous life. However, the scale of foreign wars in the Song Dynasty and the situation of war horses in the army were not necessary. The cost-effectiveness is far less than that of some steel armor, and it is cost-effective to get it. The two armies faced each other, and the three thousand elite cavalry were much more useful than the three hundred plate armor cavalry. The Song Dynasty was a large-scale war against Khitan and Dangxiang, and guns and cannons were much more important than plate armor.

Seeing the steel plates formed one by one, Du Zhongxiao breathed out: "With these steel plates, the iron of Datongjian has a way out. The world is not as good as money. With money, other industries can prosper. Now, what you lack the most is money--"

Tao Shiqi was not in his position, nor did he care about those things. He just looked at the busy production scene and felt happy. After following Du Zhongxiao for several years, he had become accustomed to seeing him turn decay into magic. The iron man in Datongjian was worried. Du Zhongxiao had just arrived for a short time and saw a way out.

Sun Chengping took his three sons to the wrought iron side and took a look, then returned to the steel frying furnace. Forging was too high-end for them, and with their own strength, they could not touch them. Sun Chengping was very practical and useless, so he looked at it in vain.

At this moment, there were two men who turned down the mountain. They heard that they were cooking steel by themselves and didn't mind. But they were all in the same journey. They heard that they opened the stove today and made an appointment to come and have a look. This is a common thing nearby, so they didn't mean to see it.

As soon as I crossed the river, I saw three fried steel stoves lying on the ground. The Niu Main Pipe said: "For the reason, why are the stoves here different from ours?"

Manager Chen also felt strange, so he hurriedly grabbed Manager Niu's sleeve and said, "Let's go, let's take a look!"

Sun Chengping was bent over and watching the craftsman get the iron from the iron outlet. Dalang on one side suddenly stood at the corner of his clothes: "Dad, Superintendent Chen and Superintendent Niu are here! We have worked hard for a lot of time, so they can't see this stove!"
Chapter completed!