Chen Qingdai is a beautiful big girl, but she says what loudly, it is really vulgar, but her analogy is very in place, and asking Da Hei is really asking in vain.

Guo Dalu also knows that his inspiration will end here, after all, everyone has learned too shallow knowledge, and it is impossible to tell a deeper truth.

He coughed and raised his voice: "Steelmaking, the key is to increase the temperature, remove impurities, control the carbon content in the iron, low carbon steel I also call soft steel, the carbon content is about 0.25%, easy to stamp, forging and forming, suitable for the most armor, high carbon steel is higher than 0.6%, the best weapon, in fact, it is too wasteful to make a whole piece of steel as a weapon, the best way is to steel mouth, so that there is both the hardness of steel, and the toughness of iron--"

Everyone knows that this is Guo Dalu teaching him a scientific steelmaking method, and hurriedly collected his mind, bowed his head to take notes, and even Li Dayan held a charcoal pen to write a stroke on the notebook - the children of Yixue are illiteracy for their parents at home every day, and now the adults in Houlong Village say that they are not all reading and etiquette, but keeping an account and writing a letter is no longer a problem.

Guo Dalu briefly explained some elements of smelting steel, and then said: "I have my own magic method for increasing the furnace temperature. The black stone I got from Fengshen Mountain, called coal, can be burned, and the temperature is much higher than charcoal. However, there is a substance called sulfur in coal, which is harmful to steel, so we first have to make coal into coke and then steel. This coke produces poisonous gases, so it must be done with caution. ”

Guo Dalu's knowledge was completely beyond everyone's comprehension, and when they heard that the black stone could be burned, everyone was already surprised, especially Li Dayan, scratching his ears and cheeks, and looking like he wanted to ask but didn't dare to ask.

Guo Dalu sighed in his heart, knowing that he was a little anxious, if he didn't take some dry goods out, he would always be unconvinced.

Well, then let's just get some dry goods, and I'll always convince you.

Guo Dalu stood up: "Li Dayan, in your iron shop, can there be pig iron and wrought iron?"

Li Dayan hurriedly said: "Yes, yes, these materials are all commonly prepared in the shop." ”

Guo Dalu said: "Make a fire and open the furnace." ”

Everyone glanced at each other, knowing that Guo Dalu was going to make steel with his own hands for everyone to see, and suddenly everyone was excited, and the stupid big man jumped up: "I'll pull the good charcoal on the cart!"

Li Dayan is a skilled hand, and soon the stove was born, and he was about to put pig iron and wrought iron into the furnace, but Guo Dalu shook his head: "Put the wrought iron bar disc in the furnace, put the pig iron sheet at the mouth of the furnace, and wait for the furnace temperature to reach 1300 degrees, and report it to me." ”

Li Dayan did as he said, Brother Hao and the stupid big man blew the side, with the help of the Ruyi thermometer, Li Dayan intuitively saw that the furnace temperature reached 1300 degrees, and he hurriedly told Guo Dalu.

Guo Dalu said to Li Dayan: "Take a tong, hold the pig iron block, lift it on top of the wrought iron bar, pour the burned pig iron juice onto the wrought iron bar, and keep turning it." ”

Li Dayan was busy by the fireside, and Guo Dalu quietly called the girl: "Girl, you go find some cow urine and some lard." The big girl didn't ask, and ran away.

Li Dayan was pouring pig iron juice onto the wrought iron wire rod, but when he saw the iron bar in the furnace reacting violently, he was stunned and shouted: "This, this wrought iron has turned into steel!"

Guo Dalu said lightly: "This is called the steel filling method, pig iron juice is poured into wrought iron, which can increase the carbon content of wrought iron, and at the same time remove impurities such as silicon and manganese in it to improve purity." This steelmaking method can only obtain crude steel, the efficiency is not high, and the output is limited, if the blast furnace is used to make steel, high-grade good steel can be obtained. ”

Li Dayan sighed again and again: "Brother Guo, I am convinced, I am really convinced! I have been striking iron for half my life, but I don't know that this pig iron wrought iron can be made of steel with such a simple rectification!"

Under the guidance of Guo Dalu, Li Dayan repeatedly poured wrought iron with pig iron juice, and continued to forge on the anvil, until midnight, and finally got a piece of steel, and he beat the steel into a sword shape according to Guo Dalu's instructions.

Guo Dalu has been paying attention to the thermometer, when the steel sword reaches 600 degrees, he immediately clamps it with fire tongs, and dips it into a basin that the big girl next to him has already prepared.

Of course it's not water, it's urine!

Guo Dalu took the sword out of the cow's urine and dipped it into another basin again, this time with lard.

This is different from the double quenching method of water quenching in the Da Li Dynasty, which is first quenched in animal urine with a large cooling rate, and then quenched in animal fat with a small cooling rate, which can not only maintain the hardness of the steel, but also ensure toughness.

Whether it is the steel filling method or the double quenching method, it is the wisdom of the ancients of Guo Dalu's original time and space, which has been invented during the Northern and Southern Dynasties, and is the steelmaking method that was ahead of the world at that time, but in the different time and space of the Great Li Dynasty, no one has invented it so far, and these two methods are simple and easy, and they are also the most commonly used by the travelers.

Li Dayan held the steel sword that had not yet been opened, and tears flowed down his eyes: "This steel can be refined so easily. Alas, my old fellow has lived all these years in vain. ”

Li Dayan turned around and gave a big salute to Guo Dalu: "Brother Guo, what do you say in the future, I, Li Jimin, have nothing to say!"

Guo Dalu hurriedly supported Li Dayan: "Uncle Li, I just understand some theoretical things, and the specific implementation depends on your help." ”

Guo Dalu took a lime pen, drew a blast furnace structure on the blackboard, and carefully explained it to everyone, when Li Dayan saw that even the air outlet has a regenerative chamber to heat the air in advance, so as to avoid the sudden entry of fresh air and reduce the furnace temperature, he repeatedly praised the exquisite details of the blast furnace.

Guo Dalu threw down the lime pen and waved his hand: "The blast furnace I planned is ten meters high, three meters wide at the waist, and once it is running, the sunrise steel can reach one ton!" -- Guo Dalu is not a ******, but he has full confidence, because this blast furnace steelmaking, also known as shaft furnace steelmaking, its technology has been very mature in the Western Han Dynasty, but the ancients made steelmaking with experience, Guo Dalu can control the process more accurately through thermometers, batching, etc., so as to refine higher-grade steel.

Li Dayan stared at the blast furnace on the blackboard, and he couldn't wait to swallow every detail into his stomach, baby, this is the real priceless treasure! The sunrise is a ton of steel! Li Dayan seems to see the molten steel rolling out of the furnace, no, it is not molten steel, but silver! Silver flowing out like water! (To be continued.) )