Kiru first went up and stroked it, then tapped the blade of the sword with his fingers, and listened carefully to the voice, but his face was a little serious, and he seemed to be a little dissatisfied.

Hu Lianke also stepped forward to take a closer look, his eyes were full of doubts, and he asked in a loud voice: "Although this sword is not of the highest quality, it is also close, and the hardness is a little too much, but it is also a good 'color' in the middle grade." It's strange, why didn't you see the impurities you threw in just now?"

"Too hard?" Harry frowned, and suddenly came to his senses, "I'm afraid your pure iron isn't 100% pure, right?"

"How can there be 100% pure iron, the pure iron refined by the teacher is already the purest in the mainland, and you can't find a purer iron than this anywhere. Jack muttered disgruntled that he thought Harry had lost and wanted to cheat.

"That's right, although I said that I can cast high-grade products, but what I asked for was absolute pure iron, and you didn't meet the requirements, so this sword is a little harder. "Harry didn't want to admit defeat, he really made a mistake, the earth is so high that the technology has not refined 100% pure iron, how could he forget.

"But the 100% iron you are asking for does not exist!" Hurenk did not put on a victorious posture, for he was more interested in Harry's forging know-how, after all, pure iron had long proven to be used as an auxiliary material due to its poor hardness.

"So I asked to do it all over again, because there were some complex data issues involved, and I had to do my own calculations and some experimentation. Harry didn't blush at all and said, "Anyway, we didn't say that it was just a one-time deal, even if the master has mistakes, not to mention that the reason for this time is also your responsibility." ”

"Okay, but you'll have to tell me what you're doing!" Hurenk didn't care if he won or lost, Harry's Fire Orb promised to be used by him anyway, he was anxious to know how Harry did it, he was a forged maniac.

"Actually, it's very simple, throw the blade of this sword back into the furnace, and then take a small amount of pure iron to add it, so that the ratio is about right. The sword was then recast with remixed molten iron. Harry instructed Jack.

This time Jack was very obedient, Harry casually let him forge a sword that was close to the top grade, you know, he usually has to rely on a certain amount of luck to make a weapon of similar quality!

Soon, the recast big sword appeared in front of everyone again, this time Kiru happily flicked it twice, and waved it in his hand, and said excitedly: "This time the sword really barely reached the top quality, it's amazing, so easy to forge a high-quality weapon." ”

Kulenk didn't bother to test it at this time, the knight was obviously also a master, so he conceded defeat, but he really wanted to know how Harry did it. Jack was also looking forward to Harry's explanation, he still couldn't believe it, the teacher said that it would take him five years to build a high-quality weapon that was now born from his hands.

Harry didn't want to hide it, after all, he wouldn't be a blacksmith with this technology, so it was better to sell Master Hulink's favor, so that he would do his best to help him build weapons. And maybe the advent of steel will bring about a revolution in the world of forging.

"Actually, it's very simple! The secret is the charcoal I just threw in. Harry explained calmly.

"You mean that you can make the iron hard by adding charcoal to the molten iron?" asked Hulenk.

"Yes, this is what I call steel! "The higher the amount of charcoal added to the molten iron, the harder the steel becomes, but conversely, the tougher the toughness, so the right ratio is an important factor in a good piece of steel. Steel with a carbon content of about 0.5-1.5% is more suitable. ”

"I see, I should have thought of it. The reason why pig iron that has been roughly refined is so hard but very brittle is because the proportion of charcoal is too high, right?"

"That's probably it, but it's not all. There is not only charcoal in pig iron, but also many other impurities, which cause pig iron to be like this. In addition, steel can also be mixed with other metals to make alloys, which is much better than pure iron, such as krypton, which is necessary in artifacts, and I speculate that if you add the right charcoal to kryptonite and iron, maybe the quality will be higher. Master, you can study and study in this direction!" I believe that Hulinker will definitely be very interested in the study of steel, and I will mention it myself (to be continued, if you want to know what will happen next, please log in .,Mobile phone users log in to ap.,Chapter more, please log in to 16k Literature Network to read!) Wake up, the sword just now is just the most ordinary steel.

"Really?" Can he still create a divine martial that is of higher quality than Oberline*'s Soul Splitting Sword?' Thinking of this, Kurenk couldn't help but stir, and the eyes that looked at Harry changed.

"Theoretically, this needs to be studied by you, master, after all, I have no conditions to experiment and no interest in being a blacksmith. "Harry gave Kulenk a big **.

"But it's hard to completely smelt kryptonite, which is why it's still difficult to create an artifact even though you have krypton. The uneven amount of kryptonite in weapons is the biggest drawback. Kulenk thought of a difficult question, "Even with the help of your Fire Spirit Orb, the grasp is not too great, but it should be able to further soften the kryptonite." ”

"Can I see your furnace?" Harry made a sudden request, as he had a general idea of how the heat of Earth's steelmaking furnaces was formed, and though he wasn't sure, he might be able to give some advice after looking at the furnaces.

"No problem, please follow me!" "Kulinker has completely regarded Harry as a master of forging at this time, maybe he can really help him break through?" "Jack, close the 'door' of the shop, you can also come to the back, this is also a kind of learning." ”

"Okay!" Jack, who couldn't hold back for a long time, excitedly closed the big 'door' of the weapons shop, and followed Harry to Kulenk's exclusive forge room.

Harry took a closer look at the design of the furnace, and a high-grade fire spirit stone was placed in the center of the burning area, and the surrounding area was used to place charcoal for burning. On the left, there is a special 'door' air outlet, and a blower made of wind spirit stone is whirring.

Seeing Harry frowning and pondering, Hurlenk didn't bother, and waited quietly.

Harry let go of his brow and said to Hurenk, "Your furnace is a rare heat, but I think if we improve two places, it should be possible to make it even hotter." ”

"Oh, please!" Khulenk had no suspicion that Harry was fooling him.

"First, I recommend that you polish the charcoal into charcoal powder and blow it into the combustion zone through a blower, so that the combustion is more complete and the fire is even, and second, I recommend blowing the blower from the bottom up, instead of blowing it flat. So it's a good idea to rebuild your furnace and redesign it with someone who specializes in it along the lines. Harry said slowly.

"I can understand that charcoal is polished into charcoal powder, but the charcoal blown in this way is easy to blow out from the air outlet to form a 'wave' fee. I don't quite understand that the wind is blowing from the bottom up, what does this have to do with the temperature?" asked Kurenk quickly, he didn't think Harry was talking casually.

"You can design a mesh isolation cover to prevent the charcoal powder from flying out of the air outlet, the charcoal powder does not need to be very fine, you need to experiment yourself to determine the appropriate size, as for why the blower is better to blow from the bottom to the top, you see, the temperature above the charcoal is significantly higher than the charcoal burning area, because the wind is hot and upward, you will be pushed to the top of the charcoal pile after the wind blows flat into the furnace, the effect is not optimal, the wind force that can be received by the charcoal gathering place below is very limited, which hinders the further burning of charcoal. "And when the charcoal is converted to charcoal powder, it floats in the furnace and the flat blowing blows it to one side, causing uneven heating, so the wind from the bottom up is the best." ”

"I see?" Khulenk obviously did not understand the principle of air expanding and floating when heated, and some were skeptical.

"Trust me, yes, you can 'get' a small model to experiment with, and if it works, decide whether to rebuild the furnace. Harry also knew that it was impossible to believe all of them when he talked about this kind of thing, so let the facts speak for themselves, he just provided an idea.

"Yes, I'll try it first, if it works, it would be great! With the help of your Fire Spirit Orb, little brother, this temperature should be able to increase by two percent! I wonder if your promise just now counts?" asked Kurenk suddenly.

"Of course!" Harry took out the Fire Spirit Ball and handed it to Kulenk, "Now I'll 'hand' it over to you, Master, is there anything else I don't worry about?" With Kulink's reputation, he must not be greedy for his own fire spirit ball.

"Good, good! You're interesting. "Kulenk didn't shirk, what he cared about was creating a god-level weapon, no matter how precious this fire spirit ball was, it was just a tool for making fire to himself. However, in my heart, I appreciated Harry's bearing and received Harry's favor.

"It seems that the master has been busy for a while recently, and my two weapons are not in a hurry, and I will ask you to build them yourself when the master has researched certain results. Harry hadn't thought of the weapon he wanted yet, so he wasn't in a hurry, but Kiru needed a weapon he needed immediately, and Harry thought about it again, "But you can first help my knight brother build a long * according to the steelmaking formula I just provided*, at least of the highest quality." ”

"There is no need for the old man to do the high-grade weapons himself, it just so happens that Jack can practice his hands!" "Hulinker is now immersed in the new forging square*, and has no time to care about anything else.

"Then it's 'handed' over to Jack's little brother!" Harry said to Jack with a smile, "How about it, Jack is confident that he can make a better sword than the one just now?"

"Of course!" Jack, who had just created a high-grade long sword, looked full of confidence, proudly 'straightening' and 'chesting'