Liu Tong led the horse out of the house, and found that there were several guards waiting for Pu Yuan outside the door, and Pu Yuan handed over the saddle and stirrups to the guards, and he also rode on the horse, and took Liu Tong to the west.

Liu Tong strengthened his judgment, Pu Yuan is definitely not an ordinary person, not to mention that ordinary craftsmen have guards, and they don't even have horses to ride. Liu Tong also admired Cao Cao even more, in history, Cao Cao was eclectic and talented! Liu Tong was also relieved that he was right to follow Cao Cao wholeheartedly.

The people came to a more remote place and entered a workshop. There are iron smelting workshops, weapons workshops, etc., Liu Tong didn't have time to take a closer look, Pu Yuan stopped at the door of a workshop.

Liu Tong saw that several big men were knocking on the red-hot iron, the long strip of red iron was constantly beaten, and then it was folded and curled, and then beaten, and after it was straightened, it was curled and folded again, and then beaten, and the percussion sound was rhythmic, and the tinkling was endless.

"Sanzi, come here." As soon as Pu Yuan spoke, a stout man in his twenties trotted over.

"Master."

"Third son, you go and make Luo Gongzi's weapons one foot eight at each end, and thicken the hundred steels by one inch and two." Pu Yuan pointed to the iron rod in Liu Tong's hand and said.

Liu Tong handed the iron rod to the third son, but saw that he took it with one hand, but he sank slightly, but he still carried it over, with good strength, Liu Tong appreciated it in his heart.

Pu Yuan thought that it was too hot in the workshop, and wanted to invite Liu Tong to sit down and rest at the door, but when he saw Liu Tong walking inside, he gave up and followed.

"Mr. Pu, do you have 100 steels?" Liu Tong was a little surprised when he heard Pu Yuan say that he had put steel on his iron rod just now.

"Yes, Childe." Pu Yuan pointed to the iron that was being beaten and said, "This is 100 steelmaking, there is no shortcut to steelmaking, it is time-consuming and labor-intensive, and the output is extremely low." We only have a few hundred catties of steel. ”

When Liu Tong heard this, he was a little moved, the output of 100 steels was so small, but Pu Yuan used it for himself when he met for the first time.

Liu Tong stood beside a craftsman and observed carefully, Pu Yuan saw that Liu Tong was observant, and did not bother, and retreated to the side to wait.

"Mr. Pu, is it to absorb carbon by putting iron in a charcoal fire to burn it red? Is this constant beating to remove impurities? ”

Pu Yuan didn't answer after hearing this, but fell into deep thought.

"Childe, it is true that 100 steels should be burned with charcoal to absorb carbon, I don't know, when the master taught him, he said that the charcoal fire is pure, and the steel can be made. As for the constant beating, it is indeed tempered to make the iron more pure. ”

Liu informed that Pu Yuan did not understand chemistry, but more about the inheritance of experience and knowledge. However, it is already a miracle that steel can be made in this era.

Liu Tong didn't know about steelmaking, but he knew a little about the principle.

"Mr. Pu, the difference between pig iron, wrought iron and steel is actually the difference in carbon content. Carbon is an element, both charcoal and coal are contained in it, sir, you keep heating in the charcoal fire, in fact, it is to let the iron absorb the carbon, and keep beating, in fact, it is to remove impurities. You do this, when the impurities in the iron are removed more thoroughly, and the carbon content reaches a certain level, you get the steel! ”

Pu Yuan was dumbfounded when he heard it, Pu Yuan knew how to do it, but he didn't know why he did it, listening to Liu Tongyi's explanation, he had a feeling of sudden enlightenment.

"Childe, what is the carbon content of steel and iron, and how to distinguish them?"

Liu Tong touched his head embarrassedly, "My master mentioned it, but I did forget." However, I would like to give a few comments to Mr., who will definitely be able to obtain a large amount of good steel! ”

"Really?" Pu Yuan's blood suddenly surged, and he pulled Liu Tong out, came to the door, asked Liu Tong to sit on the side of the case, and poured Liu Tong a cup of tea. Pu Yuan was obsessed with steelmaking, how could he let go of this opportunity, and looked at Liu Tong extremely warmly.

"The boy has never practiced it, and after hearing it, the gentleman must not fully believe it, and he must keep experimenting, but I believe that he will succeed."

"Childe, but it doesn't hurt to say, how can Pu not know the hardships and twists and turns."

"First of all, we need to improve the fuel, use coal, preferably coke, and design better bellows, which is mainly to increase the temperature of the charcoal fire. The second is to use a crucible to burn the pig iron into molten iron, stir it constantly, and carbonize the pig iron with the help of oxygen in the air to obtain steel. This practice is called frying steel, and it is fast and has a high output. But the kid has never done it, and he doesn't know if it will be successful or not. ”

Pu Yuan was excited, listening to what Liu Tong said was reasonable, but it didn't work, for a steelmaking maniac, as long as it was a possibility, it would be a great discovery!

"Childe, it will definitely be done!" Pu Yuan kept rubbing his hands, his face flushed with excitement.

Liu Tong has always liked the technicians who love to study, and he couldn't help but say: "The kid once learned from the book that the quenching of the blade is also particular, and the effect of simply using water is not good, so Mr. might as well try it with cow and horse urine."

"Really?" Pu Yuan exclaimed, what Liu Tong said was not the most critical and headache he encountered. Since Liu Tong can propose this novel approach, it must be a feasible way! There was a voice whistling in Pu Yuan's heart, and a figure was jumping!

"Thank you for your advice!" Pu Yuan got up, clenched his fists and bowed, his body bent to the ground, and he didn't stand for a long time.

Liu Tong hurriedly helped Pu Yuan up, "Just a few words, how dare you be a big gift for Mr!" ”

The two then chatted about coal, bellows, crucibles and other topics, Liu Tong was not proficient in many things, but only mentioned some conceptual and suggestive things. Liu informed that with the ingenuity and research spirit of Chinese craftsmen, the four major inventions are all good, and these things are definitely not a problem.

Pu Yuan has the skills and research spirit of a craftsman, as well as the demeanor and cultivation of a Confucian, and he must have something outstanding to be appreciated by Cao Cao. The expansion of steel production and the improvement of weapons are naturally not a problem. If you succeed in the future, you will inevitably have your own credit!

"Dawu, go get a bucket of horse urine." Pu Yuan saw a man in his twenties passing by his side and ordered.

Liu Tong saw that Pu Yuan was about to verify his method, and he beat a drum in his heart, and he didn't know if the novels of later generations were nonsense, if they were nonsense, he was not ugly on the spot.

Liu Tong glanced at the shed and saw that someone was beating a knife, and it was about to be quenched after it had been formed, and he couldn't help but feel a little apprehensive.

While the two were drinking tea, Dawu came over with half a bucket of horse urine.

Pu Yuan took the horse urine and walked inside.

"Mr. Pu, a bucket of water, a bucket of horse urine, double liquid quenching!" Liu Tong reminded. Liu Tong didn't dare to follow to see it, so he had to pretend to be calm and continue to drink tea. Occasionally glanced inside, and saw that Pu Yuan was operating it himself, and his face was full of excitement.

After a stick of incense, Pu Yuan came out happily holding a simple knife, the blade was glowing with blue light, and Pu Yuan kept wiping the edge of the knife, very satisfied.

At this time, Dawu was bringing a bamboo tube, and one end of the bamboo tube was blocked with coarse cloth. Pu Yuan asked Dawu to put the bamboo tube on the ground and handed the Pu knife to Dawu.

In the blink of an eye, more than a dozen craftsmen came around, and everyone held their breath, staring at the bamboo tube.

Dawu stood firmly on the horse post, held the knife in both hands, and slashed down vigorously, only to see the bamboo tube broken and the iron beads scattered.

When Liu Tong saw it, it turned out that the bamboo tube was full of iron beads!

Pu Yuan immediately squatted down, picked up a few iron beads on the ground, and laughed, his eyes glazed with laughter.

"Master Luo, it's done, it's done!" As he spoke, he moved his palm in front of Liu Tong's eyes, and everyone also leaned closer and watched.

I saw that there were a few half iron beads in Pu Yuan's palm that had been cut open, and everyone immediately cheered!

"Broken gold and jade, sharpened iron like clay, magic knife!" Pu Yuan grabbed Liu Tong's arm and shook it.

Liu informed that this was a steel knife forged by Pu Yuan with hundreds of steels. Having steel may not be able to make a good knife, because if the quenching is not enough, the blade is not hard and easy to curl; If the quenching is overdone, the blade will become brittle and easy to break, and proper quenching, especially after two-liquid quenching, will make the steel knife tough and elastic.

Obviously, Pu Yuan succeeded, or Liu Tong succeeded! Such a knife is undoubtedly extremely advantageous when used on the battlefield, and I have made meritorious service again! Liu Tong also became happy with everyone.

"Dawu, immediately forge twenty divine swords from these hundred steels! At the end of the month, we will present a knife to General Zuo! Pu Yuanzhi was complacent.

Just when Pu Yuan asked someone to fetch good wine and was about to drink with Liu Tong, he arrived on a fast horse.

A samurai dismounted and saluted Liu Tong, "Childe, General Cao, please go back to your home!" ”

The person who came was Cao Hong's personal guard, Liu informed that Cao Hong came back from Cao Cao, thinking that Cao Cao would definitely be overjoyed when he saw the salt that Cao Hong brought, Cao Hong must have brought good news to himself, and he couldn't help but look forward to it, and hurriedly said goodbye to Pu Yuan, and rode back with him.