Kong Jing took the arrow from Liu Yu's hand, and while putting it in his arms, he continued: "If there is a situation where the arrow does not break the armor and the armor does not resist the spear, the craftsmen will be punished according to the laws of Qin, and the light will be punished heavily, and the people and fields will be deprived of the people's lords and fields, and the heavy ones will be directly executed. It is because the Qin army is not only fierce soldiers, like wolves and tigers, but also sharp soldiers, relying on this method. ”

Speaking of this, Kong Jing smiled slightly: "Liu Yu, are you willing to work with me to create the best weapon armor in the world?" ”

Liu Yu breathed a long sigh of relief and nodded vigorously: "I can't ask for it!" ”

But speaking of this, Liu Yu still frowned: "But you just now, because you hit the wrong water, you directly chopped your fingers, isn't it a bit too much?" I know this water is used for quenching, but what water is not water, is there any difference? ”

Kong Jing shook his head: "Liu Yu, this is what you don't know, most of the creation of iron depends on this quenching, whether it is good steel or rotten iron, it can be said that it is a matter of this quenching to a large extent." ”

Liu Yuqi said: "Is it so important? What is the big difference between steel and iron? ”

Kong Jing smiled slightly and pointed to his arms: "Just like this arrow, in the Qin Dynasty, bronze arrows were used, bronze is very soft, even if a lot of things are added to the cooked bronze, it can only barely shoot through the leather armor, so although the Qin army is sharp, but when it encounters iron weapons, it still suffers a great loss, which is also the reason why from the end of the Qin Dynasty to the beginning of the Han Dynasty, gradually transitioned from this bronze weapon to iron tools." ”

Liu Yu nodded: "Yes, it is said that bronze was only used in ancient Xia, Shang and Zhou eras, anyway, I can't see it now, even my family's farm tools are made of iron." However, I never knew how this iron was made, and I didn't understand the difference between iron and steel. ”

Kong Jing Zhengse said: "Iron, is made of iron ore and charcoal together, sealed to those high-heat furnaces after refining, iron ore encounters an extremely hot flame, will melt into iron juice, and then solidify, some impurities in these iron juice will be eliminated, it will become iron, this block iron smelting method, from the middle and late Warring States period began to appear, to the early Han Dynasty, has gradually taken shape. ”

Liu Yu nodded: "I heard the blacksmith in the village say that this kind of iron, called pig iron, is very hard and can be used to cast things, but it is also very brittle, and it will break when it encounters a slightly stronger external force, and it can't be forged repeatedly, right?" ”

Kong Jing smiled slightly: "That's right, this kind of pig iron, the hardness is okay, but it can only be cast, not forged, and it is not practical, the reason why this is the case is because there are a large number of sundries in the iron juice, only by constantly melting and casting, casting and then melting, after repeating many times, the impurities in it are almost discharged, and this will become wrought iron." ”

Liu Yu said with a smile: "This wrought iron is even more difficult to use, it is extremely soft, and it is crooked when touched, and even my farm tools will not use these wrought iron." ”

Speaking of this, he hooked the corners of his mouth: "It's strange to say, shouldn't this iron be harder and stronger the more it is refined, how can pig iron become wrought iron, but softer?" ”

Kong Jing smiled: "This reason, our predecessors have been groping for hundreds of years before realizing it. Some of the impurities that can be removed can increase the hardness of iron, and the most important thing is charcoal powder! ”

Liu Yu said: "Charcoal powder? Isn't that the ash left behind after the wood is burned into charcoal? This thing makes iron hard? ”

Kong Jing nodded: "Yes, it sounds so incredible, but that's the truth." So the key to changing from iron to steel lies in the addition of this charcoal powder. Our steelmaking is to melt wrought iron, add iron essence and charcoal powder, and solidify again, which can be calcined. ”

"This forging is to take the whole piece of red steel, while it is hot, with a hammer, on the anvil, so that the piece of steel will be beaten into the various shapes we want, and when the shape is almost completed, the whole piece of red steel will be quickly immersed in water, if the quality of the water is what we need, then it can be cooled very quickly, into all kinds of steel."

Speaking of this, he pointed to the iron helmet on his head and said, "This helmet is made into a helmet shape in this way, and it is used to protect your head. ”

Liu Yu said thoughtfully: "No wonder I see that the blacksmiths make iron, they all quench a piece of hot red-hot iron into the water, so the texture of the water determines the hardness of the steel?" ”

Kong Jing sighed: "That's right, the water is too cold, the cooling is too fast, sometimes there will be cracks inside the steel, if the water is too hot and can't lower the temperature, the steel can't cool quickly, it will be deformed, and the hardness is not enough, so what kind of armor you want to build, what kind of water you have to use." Otherwise, what would be the result of the soldiers wearing brittle or torn armor to the battlefield? ”

Liu Yu sighed: "That is, the armor can't resist arrows, and the spear can't penetrate the armor, which is indeed a very serious matter." ”

Kong Jing nodded with satisfaction: "Actually, I can turn a blind eye, and it's not that I go to the battlefield to fight and do my, but what is really damaged is a soldier like Liu Yu, if you wear inferior armor, which leads to death, and you can't kill the enemy with a weapon that breaks at a touch, will you still defend that person like this?" ”

Liu Yu hooked the corners of his mouth: "But just once I was lazy to get water, I directly chopped off one of his fingers, isn't this a bit too much?" Even if you beat him severely, the next time you deal with it like this, it will be better than this. ”

Kong Jing shook his head: "Liu Yu, I was a little disappointed when I saw you today, you are also an officer, you should know that if you are not a soldier, this is not an ordinary combat unit, it is a bunch of leftover scum, waste with no future, if it weren't for the three-year contract of sale when they entered the camp, they would have wanted to go home a long time ago." If you don't use this extraordinary means, then everyone will cheat and play tricks, this time I don't punish this leader, this situation will only increase in the future, or that sentence, when the time comes, the unlucky will still be the warrior! ”

Liu Yu sighed: "Can't you think of some other way to let them have a chance to stand out like ordinary warriors?" ”

Kong Jing said with a smile: "It depends on your ability, if you can create good armor and ordnance to the satisfaction of Xuan Shuai, you can become the first person to go out from here, Liu Yu, I believe you have this ability, but it depends on how much effort you are willing to spend here!" ”

Liu Yu's eyes flashed coldly: "I will definitely fight the best weapons and armor for the best warriors!" ”