Lin Feng was determined to stand up, and made a gesture of invitation to the remaining four treasure knife holders, and at the same time nodded lightly at Zhao Bin concealedly, Zhao Bin took the lead in the ranks, and two strode over, and stomped on the body of a forbidden army waist knife on the outermost side of the table.

With a sound of "choking", the forbidden army's waist knife was cut off at the widest point in the middle section, and the knife in Zhao Bin's hand was castrated, and it slashed deeply into the middle of the desk.

Situ Zhouzong stood up with a brush, this knife was sharper than the knife that shocked the four in the debate competition that day! The other three sword wielders couldn't help but take a step back, looking at the broken blade on the table in horror.

Zhao Bin suddenly exerted his strength, pulled the blade out of the table, and held it high in the air.

The sunlight shining through the lattice shone on the knife, shining the shiny blade, and the entire blade was intact, and there was not a single gap in sight.

"Good knives! Good Divine Soldier! It is worthy of Master Sun's masterpiece! Situ Zhouzong was overjoyed and took the case. In this life, Zhou Zong has been bandits on the grassland, and has fought with Khitan warriors, it can be said that what kind of strange soldiers and divine soldiers have been seen, and he knows that the waist knife of the Southern Tang Forbidden Army is already a first-class weapon in the world, but he never imagined that Sun Cuo's newly cast knife is so sharp, this is the real iron like mud!

The other examiners also stood up in shock. Although they are all civilian officials, they know how important a weapon that is unparalleled in the world is to the battlefield!

Only Lin Feng stood there disapprehantly, this kind of broken knife test had already been tested several times in the valley base!

This knife is a new type of divine weapon forged using the improved Sugang method, and it is Lin Feng who recently told Sun Cuo about this crossing steelmaking technique!

Before the seventeenth century, the countries of the world generally adopted the method of low-temperature smelting of wrought iron, and the iron and steel could not be melted, the iron and slag were not easy to separate, and the carbon could not penetrate quickly. In ancient China, after the historical accumulation of "block refining method" - "100 steel making" - "frying steel method", China first invented the steel filling method in the Northern and Southern Dynasties, and the famous metallurgist Qi Wuhuaiwen of the Northern Dynasties Wei and Qi used this method to make a very sharp "Su Iron Knife", which successfully solved this problem. After the middle of the Ming Dynasty, the steel filling method was further developed into the Suzhou steel method.

Sun Cuo listened to Lin Feng's suggestion, first put the wrought iron in the furnace to blow it up, and then put one end of the pig iron obliquely into the furnace mouth to heat. When the furnace temperature reached about 1300 degrees Celsius, the pig iron in the furnace continued to melt and drip, and the wrought iron had softened. After the pouring is completed, the air blast is stopped, the steel ball is clamped, and the anvil is hammered and forged to remove impurities. During this period, unlike the real Sugang method, Lin Feng added a process in the middle that did not have it originally, and put the wrought iron sheet into the burning charcoal for a certain period of time to carry out surface carburizing; Then, repeat all of the above procedures to finally get the purest steel knife available.

There is no doubt that the most wonderful advantage of the new and clever steelmaking method of the Sugang method is that it happens to take advantage of the earth's gravity, which is the biggest enemy of the steel-filling method. Operate in front of a high-temperature furnace above 1300 degrees, if the craftsman's nerves are tough enough, the person is resistant to high temperature enough, and the subordinates are skilled enough, they can evenly drip the molten iron. At the same time, if the wrought iron sheet is thin enough before entering the furnace, the carburizing effect will be good and can be repeated.

If done properly, the effect of the cycad method is basically the same as that of the general surface carburizing method. However, because molten iron itself is not a good carburizing agent, this fundamental problem remains. Therefore, the procedure that Lin Feng suggested that Sun Cuo add was the most critical, that is, the surface carburizing method that had been tested by 3,500 years of history.

The man with the iron treasure knife stepped forward, picked up the broken blade of the waist knife on the table and looked at it again and again for a long time, and then looked up at the intact steel knife in Zhao Bin's hand, before turning to the examiners, shaking his head and saying: "My iron treasure knife will be hit with all its might, and it will also be able to break the waist knife, but I believe that there will be some damage, and this knife is a family heirloom, I don't want this knife to be damaged in my hand, I'm very sorry, quit below!" ”

Lin Feng also shook his head regretfully. In this era, there are only two methods to obtain pure steel, one is the surface carburizing method, the other is the method of forging iron treasure knives, the crucible steelmaking method pioneered by the Indians, or the Salim method, by placing wrought iron and wood in the crucible, sealing and heating to a very high temperature for 4 hours, you can obtain pure high-carbon steel. However, this kind of steel is brittle and phosphorus due to its high carbon resistance, and the key is the secret recipe of carburizing additives, which is related to the success or failure of these blacksmiths, but I am afraid that no one will take the initiative to reveal it!

Seeing that another competitor withdrew on the spot, and the other two blacksmiths glanced at each other, Yue Sheng, a craftsman from the north, took the lead in stepping forward, drew his knife in his hand, roared, and slashed at his waist knife.

The two knives intersected, making a piercing sound, and the knife in Yue Sheng's hand was deeply embedded in the waist knife.

Lin Feng stepped forward and observed that Yue Sheng's blade was slightly curled, but he had already cut off nearly two-thirds of the waist knife.

Lin Feng took a step back and motioned for Wang Yue to step forward.

Wang Yue gritted his teeth and stepped forward to slash the sword, and the sword body was also embedded in the waist knife, but the cut part was less than one-third of the blade.

"Good sword, good sword! Two masters, can you listen to Lin's words? Lin Feng stepped forward and stood between the two.

The two craftsmen bowed in unison.

Lin Feng pointed at Zhao Bin, who was standing quietly next to him, and said, "Two masters, are you willing to learn the forging method of this treasure sword?" ”

"Good!" Wang Yue blurted out, Yue Sheng was happy at first, but suddenly became worried.

Lin Feng saw all this in his eyes, remained silent, and continued: "My majesty of the Tang Dynasty wants to hire two as masters of iron smelting in the Tang Dynasty, and the magic weapons forged will be divided into pieces according to the number of pieces, can the two of them be willing to give in?" ”

"Okay, no problem!" Wang Yue blurted out again. And Yue Sheng was overjoyed at first, his face was full of melancholy again, he looked up at everything in Zhidaozhai, and then looked at Lin Feng's smiling face seriously, and asked rhetorically: "Lord Lin, my family is trapped in the north, I wonder if my family can move them to Datang safely?" ”

Yue Sheng is from the Central Plains, because he has been making a living by striking iron for generations, his father has been requisitioned by the government to build weapons, and his family has also been imprisoned as hostages. Along the way, Yue Sheng saw the prosperity of the Southern Tang Dynasty and the importance that the Southern Tang Dynasty attached to craftsmen, and he had long been moved.

Lin Feng smiled and said loudly: "I can guarantee that they will arrive in Jinling safely unharmed!" Brother Wang, what about you, what about your family? ”

When Wang Yue heard this, he hurriedly said: "I am alone and have no family. ”

At this time, there was silence in Zhidaozhai, and the examiners on the scene were already stunned, which one did Lin Feng sing? Didn't you hear that His Majesty said that he wanted to hire these craftsmen?

"Okay, well, we will be the people of a country in the future, and we will have to be closer in the future." Lin Feng stretched out his right hand, first shook it vigorously with Yue Sheng, who was a little inexplicable, and then stretched out his right hand towards Wang Yue.

Wang Yue, who was still holding the sword in his hand, hurriedly returned the sword to the sheath and handed over his right hand. Lin Feng's face was full of smiles, his right hand took Wang Yue's hand, and his left hand also covered it enthusiastically.

Just when Wang Yue was about to withdraw his hand, Lin Feng's hands suddenly pulled in front of him, and the moment Wang Yue's body fell forward, his right leg quickly kicked out, hitting Wang Yue's abdomen.

At this time, Lin Feng kept his hand and exerted his strength violently, twisting Wang Yue's right hand behind his back, and with a wild roar, his body fell down, pressing Wang Yue to the ground, and then he shouted violently: "Come on, tie up this Wu Yue's spy!" ”