Master descends to earth

Chapter 37

"How could you..."

Huimei Liusheng was horrified, and stared at Su Yuan with her small mouth open, dumbfounded. If she hadn't confirmed that today was the first time they met, she would have thought that the other party had witnessed the whole process of forging the sword with her own eyes!
"There are many problems with your sword craftsmanship. First of all, jade steel. Although the expensive red eye iron ore is used, the iron sand will sink to the bottom of the fire bed within an hour during smelting. It becomes jade steel. It also ensures that the pig iron does not dissolve, thus giving the samurai sword its indispensable chemical and physical properties."

"Then the iron ore is slowly melted into the smelting furnace, and there is a three-meter-deep combustion chamber below the furnace. When the temperature reaches 1000 degrees Celsius, all impurities will sink to the bottom of the combustion chamber, leaving only pure steel."

"A master must practice by listening to the sound of the stove to judge the progress. A good knife must be covered with high-purity steel, and the inside will contain a small amount of impurities, such as sulfur, so the blade will be sharp."

"Because of your lack of experience and lack of control over this process, the jade steel was not pure enough!"

After hearing this, Emi Yagyu's face changed drastically. Just when she was about to speak, Su Yuan interrupted directly and continued: "The second problem is more serious, which is forging. Reheat the jade steel to 1300 degrees Celsius, and then use it to melt all the jade steel before the heat dissipates. The steel blocks are hammered into one piece, requiring quick movements and precise strength, so that the remaining impurities can be removed by forging."

"The quantity of the finished product is reduced by half compared with the original pig iron to become a whole piece of knife blank. It is necessary to continuously fold and forge the steel block to make the carbon evenly distributed, so that the metal raw material for casting the knife is considered complete."

"And as a woman, your strength is obviously insufficient, and you haven't asked others to help you. As a result, the density of knife embryos is far below the standard. You are strong on the outside and dry on the inside!"

Su Yuan pointed at the patterns on the sword, and scolded: "The best proof is here. A real master will estimate the carbon content according to the color of the steel. After continuous folding and forging, there are 5000 layers of steel per centimeter. The texture of the ground is called the ground muscle, just like the Longquan sword, the clearer the better, not chaotic."

"You still use the ancient method of encasing mud and quenching this knife?" Su Yuan looked at Liu Shenghuimei's increasingly surprised expression, shook his head, and said, "Encasing mud and quenching is an ancient method that has been passed down for thousands of years. During the process of isolating and protecting all important parts of the blade, there will be an obvious line at the intersection of the softer steel inside and the hard blade, which is actually the blade pattern, which is an important symbol of a high-quality katana."

"Then fire training is carried out. It is required to accurately judge the temperature of the blade by eyes in the dark. Eight hundred degrees is the best, that is, when the blade reaches the bright red of the morning sun."

"Put the knife blade that has reached the temperature into the water, so that the part covered with thin clay will cool rapidly and then become very hard. The edge of the clay-covered edge is rapidly cooled, and the carbon in the steel is under great pressure. This part is will be the blade."

"The structural changes during the cooling process cause the katana to bend naturally, and a top-grade katana is bent in the shape of a crescent, like a tengu eclipsing the moon."

Emi Yagyu had nothing to say now, she stared blankly at her peers in front of her, Su Yuan put down the sword, and said helplessly: "The only thing worthy of recognition is the grinding process, I can only say that you are rich, and thousands of dollars worth of whetstones are not spared , although the technique is rough, the effect is quite satisfactory.”

"It's a pity that I still don't know the essence of grinding. When sharpening a knife, the master has to carefully look for the inner beauty of each samurai sword, and the subtlety of each swordsmith's school when casting a knife. Teaching students according to their aptitude is perfect."

"Not to mention the fine grind, but also the overall grind..."

"What?" Huimei Liusheng suddenly exclaimed, grabbed Su Yuan's arm tightly, and asked forcefully, "You know how to grind as a whole?"

"Hmph, what's so difficult about this!" Su Yuan snorted coldly, and said to himself: "Longquan is the capital of sword making for thousands of years, and most of them are ancient secret skills, so it's nothing to grind them as a whole!"

Seeing Hui Mei's dull expression, Su Yuan felt refreshed. In fact, the method of overall grinding is very mysterious, and it is an unspoken secret.It may be necessary to use a unique method to whiten the blade to expose the line where the two kinds of soft and hard steel meet, so as to gradually reveal the inner beauty of the metal.

Then sharpen the tip of the knife in the same way as sharpening the blade, but with more care and focus.Each has its own unique secret recipe when sharpening the tip of the knife, so the final effect is also different.

That's why Dibang used the method of dropping the silk scarf to test the sword. Even a master like Xu Kui didn't handle the tip of the knife perfectly, which shows how difficult it is.

"You and I……"

Yagyu Emi was stunned, looking at the confident Taidao in her hand, she suddenly gritted her teeth, raised her head, and retorted loudly: "You can't prove everything you say on paper, so..."

"You want evidence?" Su Yuan was waiting for this sentence, smiled slightly, picked up the Taidao again, turned around and came to the display stand, and fixed it on the iron frame.

"Now I will prove it to you!"

Su Yuan turned around, fixed on Liu Shenghuimei with sharp eyes, stretched out his hand, and said to Xu Kui: "Broken sword!"

Xu Kui took out the broken sword from the package and offered it with both hands. Su Yuan held the sword with one hand and showed it: "You want to see the evidence? Just your knife, not to mention the Seven Star Sword, even a broken sword can kill you with one blow." break."

"Look!"

After speaking, he turned around sharply, and slashed hard at a certain position of the Taidao, only to hear the crisp impact sound, and everyone was instantly stunned.

"One sword and two break!"

"No way? Taidao is so vulnerable?"

"Is this too watery?"

Huimei Liusheng's eyes were dull, looking at her proud work on the ground, it was split into two, and the opponent was still a broken sword!
Su Yuan returned the broken sword to Xu Kui, and stood with his hands behind his back. The little girl in front of him felt a little sorry for being hit.It looked like a broken sword, but in fact it was a fake golden lightsaber, not to mention the most fragile heart of the sword he had cut, so he could easily grab it with his hands.

Who made Yagyu Huimei unlucky to be selected by the system, if she wants to conquer the little girl as soon as possible, she must be hard and big, big, live well, and not clingy!
"Actually, your qualifications are not bad, but you lack the guidance of a famous teacher. Many things cannot be solved by having money. I hope you can understand this."

Facts speak louder than words. If you heard someone say something like this just now, you would definitely dismiss it.But now, Huimei Liusheng looked at Su Yuan, and finally understood why even Jin Sanye treated this young man with respect.

Suddenly remembered something, turned around abruptly, quickly took out another sword box from the box, came to Su Yuan, bowed deeply, raised his hands above his head, and said respectfully: "Thank you, Master, for pointing out the maze, please read it again Look at this knife!"

(End of this chapter)