After hearing this, Heizi bowed respectfully to Han, "Thank you for your teaching, sir."
Han Du smiled and said: "It's not really a teaching, it's just a trick to 'use a villain's heart to judge a gentleman's heart'. But who made this world have too few gentlemen and too many villains?"
After sighing self-deprecatingly, Han Du looked at Heizi, paused and said, "Heizi, how do I treat you?"
Heizi was stunned for a moment. He didn't know why the adult asked this, but he still said solemnly: "When an adult treats a young person, he is naturally as kind as a mountain."
Han Du was the first to teach Heizi how to build a blast furnace, and he was fully responsible for firing the kiln and making steel. This made him leap from an ordinary craftsman to a craftsman second only to Huang Lao.
Han Du treated Heizi very well.
After hearing this, Han Du's expression did not change at all. He continued to ask: "Have you leaked the construction method of the blast furnace?"
Heizi glared suddenly, and loudly assured Han Du: "Absolutely not! If your Excellency hears the slightest hint of how to build a blast furnace has been leaked, Heizi is willing to come forward and see you."
Seeing Heizi's solemn words, Han Du smiled and waved his hand and said: "What will I do with your head? But I still want to remind you that if you don't reveal this method, you will be safe. If so,
If you really reveal it, that will be the day you die, do you understand?"
"I understand, little one." Heizi nodded heavily.
Seeing that Heizi understood the importance, Han Du couldn't help but nodded.
"I came to you today to ask you to do something."
"My lord, no matter what you ask me to do, I will do whatever I want. Moreover, I promise not to let the third person know about it." Heizi solemnly clasped his fists towards Handu.
Han Du stretched out his hand and pressed it lightly, and said: "Don't worry about this now. I'll ask you first. I asked you to try using different formulas to make steel. Have you done it?"
"The younger ones have been doing it."
"Is there any reward? Has a better steel formula been found?"
"some."
Han Du was overjoyed when he heard this and said quickly: "Go and get it for me to see."
Soon, Heizi came to see Han Du holding a bright silver steel bar the size of his thumb.
"Sir, this is it."
It was obviously steel, but when Han Du held it in his hand, it felt tight and delicate. To be honest, Han Du only knew that there were many recipes for making steel in order to make steel with different uses.
But Han Du had no chance to see these formulas. Therefore, Heizi could only try out the formulas one by one, like a 'blind cat meets a dead mouse', relying entirely on luck.
Han Du had no hope for this at all. He didn't expect that Heizi was so lucky that he could actually gain something.
"How is the quality of this steel?" Han Du held the steel bar and looked at it over and over.
Heizi introduced from the side: "According to the standards given by adults, the hardness, strength, and toughness of this steel are about 10% stronger than the rails we cast. This is already among the various steels I have made.
, the best kind.”
"What about the cost? How about the cost?" Han Du asked quickly.
Heizi suddenly felt a little embarrassed, paused, and then said: "The cost is naturally higher, 30% higher than cast rails."
This is why Heizi feels embarrassed. The three standards of the steel materials are only 10% higher, but the cost has increased by a full 30%. In his opinion, this is a loss-making business.
But Han Du didn't think so. When Heizi said that the cost was only 30% higher, the thought that flashed through Han Du's mind was 'getting rich again'.
It's a pity that whether you get rich or not, it probably has nothing to do with you. If the steel is not of such high quality, Han Do is still interested in the formula.
"Go and bring the formula to me."
Heizi took out a book from his pocket, opened a page and pointed it to Han Du.
"Sir, look, this is it."
This page of paper is filled with densely written conditions, and it is no different from other pages of paper. Even if others get it, they won't know which one is good and which one is bad. Only Heizi himself can tell the difference.
Han Du looked at it carefully, and after making sure that he had written it all down, he told Heizi: "You must keep this notebook and never fall into the hands of outsiders."
Heizi smiled and said: "Sir, don't worry. I bring this thing so that I can record it in time when I have ideas. I always carry it with me. I write down the useful formulas separately and save them separately.
If anything happens, I will destroy it as soon as possible."
So much the better.
Han Du nodded, and then said: "Although I seem to be a mother-in-law, I still want to remind you. The formula is more valuable than you, and no one will do anything to you with the formula, but once you tell it
Formula, even if others try to keep the secret of the formula, they will definitely kill you."
"Thank you, sir." Heizi nodded heavily.
When Han Du saw it, he smiled with satisfaction, waved to him and said, "Come, come here."
Heizi knew that the master would definitely give him extremely important instructions next, but he still walked to Han Du without hesitation.
He lowered his head and said in a low but solemn tone: "Please give me your instructions."
Han Du looked at Heizi's words with admiration. He was well informed and understood the importance. It was very good.
He took out a stack of blueprints from his arms, opened them one by one, and showed them in front of Heizi. "I want you to cast all these things for me. You can cast these molds according to the previous materials, but these things.
"
Han Du stretched out his finger, pointed at several separate drawings, and said emphatically: "You must use the same materials to cast these things. Is there any problem?"
Heizi did not answer Han Du, but carefully read the drawings one by one. Most of these things were molds for making the things Han Du pointed out. From a casting point of view, it was not difficult for Heizi.
Heizi looked at several drawings of the casting materials specially requested by the adults. Although these things looked very strange and complicated, it was hard to understand what they were used for. However, he still did not ask, but nodded to Han.
head.
"No problem, we can make it."
Han Du smiled and shook his head and said: "These things are not as simple as you think. The requirements for accuracy are very high. We can't expect to succeed in one go. After I make the micrometer, we will do it one by one."
Test it slowly. By the way, I asked you to try making springs before, did you succeed?"