Chapter 169
Refined iron is naturally rare.Except for the two that were forged not long ago, the rest of the refined iron is about the size of a fist.

Ni Tu shook his head after reading it, and asked:

"Brother, how many times have you repeatedly forged this fine iron?"

"Qiqi 49 times of quenching and forging, each time the size of the hammer hits no less than a hundred times."

Ni Tu shook his head, "Your steelmaking skills are still not good enough."

Unconvinced, Wang Yu counted the examples with his fingers: "This is something I have improved a lot. We forge a lump of soft iron with a lot of impurities and forge it into wrought iron that can be used. After repeated heating, the iron absorbs the carbon in the charcoal, increases the carbon content, and reduces the inclusions, so that there is a steelmaking with a tight structure and uniform carbon content."

"In order to increase the purity of the steel, I not only asked them to increase the number of times of burning, beating, burning and burning, but also increased the number of times of folding. In this way, the quality of the steel has improved a lot, and only then can the sword used by His Majesty be obtained. .”

Ni Tu shook his head after hearing this, and asked, "Steelmaking takes a lot of time and labor, and the forging efficiency is too low. How can we meet the needs of mass production?"

"If you want to increase production in a period of time, you have to increase the number of iron ore screening and forging craftsmen."

"You don't need to be so troublesome, brother, why don't you use steel frying technology?"

"What is steel frying technology?" Cheng Yaojin interrupted and asked.

"Heat the pig iron into a semi-liquid and liquid state, then add iron ore powder, while stirring continuously, use the iron ore powder and oxygen in the air to remove part of the carbon in the pig iron, reduce the carbon content in the pig iron, remove the slag, and directly obtain Steel, this is the technology of fried steel. With the technology of fried steel, a large amount of cheap and high-quality wrought iron or steel can be obtained in a short period of time. If it is repeatedly heated, folded, and forged, it can be made into high-quality steel parts."

"But the question is how to burn this pig iron into water? How much wood and man-hours will be consumed!"

After Wang Yu said this, Ni Tu noticed that the huge stove was full of firewood.

"You use charcoal as fuel, and the heat is low, plus the furnace body is small and the blasting equipment is poor, so the furnace temperature is relatively low and cannot reach the melting temperature of iron. No wonder the iron produced is a spongy solid block, which can only be used repeatedly Forged to improve the quality of iron."

When Ni Tu said this, Wang Yu and others were very happy, knowing that Ni Tu had a solution.

"Tu'er, if you have any good ideas, just tell us. Let's see if we can crack the fire and the current smelting technology."

"One thing to increase the power of fire is to start with fuel." Ni Tu thought of the time he was dealing with Yuchi Xunyu, in order to deceive the group of veterans, Ni Tu used his skill of turning stones into firewood and lit the stones on fire.I don't know if Yuan Digang, who looked at him with a look of admiration, has figured out that those ugly stones are coal?
"For this method, you can ask a man named Yuan Digang for help. He is familiar with Yuchi Xunyu, so you can ask him."

"I'll do it!" Cheng Zheng volunteered and took the job.

"The second is to modify the furnace and blower equipment. Later, I will use two sketches to make them for you."

Cheng Yaojin accepted the task: "I will arrange craftsmen to build it day and night."

Ni Tu nodded, and continued: "On the premise that the firepower and wind are strong enough, we still need to improve the ironmaking technology. When my teacher once was drunk and argued with fellow Taoists whose blade was sharp, my teacher Zeng Read out some relatively rare ironmaking techniques."

"Oh? What kind of technique is it, please do not hesitate to teach me!" Wang Yu said, then took out a brush and a bundle of paper from his pocket, licked the tip of the brush with his tongue, and waited for the record.

"The teacher said, 'burn pig iron finely, use it to make it heavy and soft, and then turn it into steel', that is to say, select high-grade iron ore to smelt high-quality pig iron, and then pour the liquid pig iron on the wrought iron. It is smelted several times to carburize the iron into steel. It is also mentioned that the pig iron and wrought iron are first smelted into steel by the steel pouring method to make the cutting edge, and then the double liquid quenching method is used to use the soft iron as the spine, and the animal is bathed. Drowning, tempered with the fat of animals' The knife made in this way is called "Su Tie Knife", which is extremely sharp and can cut through iron armor in one fell swoop."

"Such an artifact is the forging technique of Mo Dao that my brother said earlier?" Cheng Zheng asked excitedly.

Ni Tu nodded: "Exactly!"

"Double liquid quenching method? Usually, craftsmen only use water, but they have never thought of using double liquid."

Ni Tu smiled and said: "This is really the reason why there are so few fine steels. Old craftsmen should know that using different water as the cooling medium for quenching can obtain knives with different performances. First quench in animal urine with a high cooling rate. Then quench in animal fat with low cooling rate, so that steel with better performance can be obtained, avoiding the simple use of one kind of quenching, preventing cracking and deformation of the workpiece, and making it have a certain toughness. This is Su iron knife and double liquid quenching combination of law."

"But the premise of this is that a technology called the steel filling method will be used."

"My subordinates would like to hear more about it." Wang Yu simply threw himself into admiration for this knowledgeable kid.For a long time, he has been thinking hard about how to improve the precision of steel. He did not expect that after hearing what Ni Tu said, he realized that his thinking was too limited. Another way.

But Ni Tu's words greatly broadened his horizons.

"The pouring method is easy to operate and easy to master. If you want to obtain steels with different carbon contents, you only need to mix pig iron and wrought iron in a certain proportion and smelt them."

As for what kind of pig iron is used as a carburizing agent, because of the high temperature after melting, the speed of carburizing into wrought iron is accelerated, the smelting time is shortened, and the productivity is improved. Also, wrought iron becomes steel because of the infiltration of carbon, and pig iron is also decarburized. It can be turned into steel, which increases the output of steel. Ni Tu is worried about carbon and decarburization, but they don't understand it, so they don't mention it.

"I'll make another suggestion."

"Please teach me, Master!"

Wang Yu, who has always been rebellious and unruly, was completely convinced in front of Ni Tu, which naturally made Cheng Yaojin and Cheng Zheng beside him very happy.

Ni Tu went on to say: "There is a trick in the method of pouring steel, that is to use wrought iron as the raw material iron, put it in the furnace, put the pig iron plate at the furnace mouth, and when the temperature of the furnace rises to about [-] degrees, When the pig iron plate starts to melt, use the tongs to clamp the pig iron plate and move it left and right, and constantly turn the material iron so that the material iron is evenly poured into the pig iron liquid. In this way, both good carburizing effect and severe oxidation can be produced. The effect is to separate the iron and slag, and produce steel with less slag and uniform composition. These are excellent materials for making mo knives."

"Wuhaha... In this way, my Tang Dynasty will gallop on the battlefield again, and I will be invincible!" Cheng Yaojin laughed happily.

The radiance on his face instantly made him look younger.

(End of this chapter)

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