Yu Yueyun looked at the hourglass and calculated the time. From time to time, he lifted the steel column and waited for a moment, and then continued quenching - this was to prevent cracks from appearing after quenching too hard at one time. At the same time, he also asked people to test the aura content in the water. It was used for quenching.
But it's a spiritual spring, not ordinary water.
After repeated tests, everyone found that direct quenching would cause the black iron to form a kind of 'spiritual insulator'; but if it is quenched with spiritual springs, this situation can be eliminated.
However, quenching is also a technical activity. The higher the quenching temperature, the harder the steel is; but the higher the temperature, the easier it is to cause breakage.
And how to master the "degree" requires experience and serious research spirit.
In this regard, Yu Yueyun showed a talent that shocked Zhang Hao. He also learned from folk blacksmiths and ordinary weapon refiners and studied hard.
In just a few days, he mastered the basic requirements. Maybe it's not perfect, but at least it's enough to deal with the current steel pillars.
Zhang Hao does not require these steel pillars to reach the strength of "high-grade magic weapons", as long as they can reach the strength of ordinary magic weapons, it is enough. Technology must be accumulated slowly.
Half a day later, after the steel column had cooled down, Yu Yueyun placed the steel column inside another barrier, adjusted the flame temperature to 500 degrees, and heated it gently. He also asked the craftsman next to him to wait two hours before heating the steel column.
Take out the column and let it cool naturally.
For the past two days, Yu Yueyun was busy without touching the ground, personally supervising the production of each steel column. As a precaution, Yu Yueyun produced a total of 14 steel columns.
In the end, Zhangjiaxuan's iron output could not keep up, and it was even mobilized directly from Luancishan Factory. Fortunately, the road from Luancishan to Zhangjia has been completed, otherwise it would be another troublesome matter.
Each of the fourteen steel columns is about 8.6 meters high - it was originally expected to be eight meters high, but due to the lifting barbs reserved above, the height increased by 0.6 meters.
The bottom of the steel column is one meter in diameter and eight meters in height; the upper barb is more than 30 centimeters in diameter, forming a barb about 0.6 meters in height.
Each steel column weighs around 51 tons, with an overweight of no more than 0.2 tons.
Early on the sixth day, Zhou Jue led everyone from the Weapon Refining Guild, accompanied by several majestic masters wearing Jiuyang Sect costumes.
Behind these "middle-aged" people, there was a man and woman with rather aloof postures, who seemed to be a couple. The woman was talking to Zhou Xueyao, and the two women kept laughing.
Beside her, Mu Yingying looked at Zhou Xueyao warily, her eyes oscillating between Zhang Hao and Zhou Xueyao from time to time.
Zhou Jue came over, "Brother, let me introduce you. This is the master of Jiuyang Sect's weapon refining hall, Uncle Zhang Xinhan, who is in the early stage of Yuanying. His weapon refining skills are unmatched by anyone."
Zhang Xinhan nodded to Zhang Hao with a cold face and said coolly: "Don't listen to his nonsense. In terms of refining weapons, I can only say that no one among his peers can match him. Compared with some elders, elders, etc., he still has shortcomings."
Zhang Hao:...Are you modest or boastful?
Zhou Jue looked a little embarrassed, and had no desire to introduce in detail. He casually pointed at the people behind Zhang Xinhan and said simply: "These are all from the Jiuyang Sect's Weapon Refining Hall."
Then he pointed to the pair at the back: "These two are from Xinglin Hall, Master Lu Yang, and Lu Yang's wife Xiao Xiao, both are in the Nascent Soul stage.
Master Lu Yang is the best refiner in Xinglin Hall, especially in the alchemy furnace. Master Xiao Xiao is unique in alchemy. Many of the elixirs I refined for you were made by Master Zhang."
Just as he was talking, someone from Xuantie Factory also came. Li Yousheng and Li Yuanyuan were leading the team, dressed fresh and beautiful. But Li Yuanyuan saw Zhou Xueyao immediately.
I wonder if beautiful girls are inherently attracted to each other.
Today, Zhou Xueyao did not wear a veil, her face was bare, but she looked extraordinary, attracting the attention of countless people.
Just when Zhou Jue introduced Lu Yang and Xiao Xiao, Zhang Hao and Zhou Xueyao started chatting and laughing. Seeing that they looked very familiar, the shyness on Li Yuanyuan's face instantly faded away.
An inexplicable sense of crisis and a little sourness arose in her heart. This woman who suddenly appeared looked... so outstanding.
Zhang Hao and Zhou Xueyao had spoken, and then said to everyone: "Thank you all for coming to the Zhang family despite your busy schedule. I won't say any polite words. The Zhang family has prepared the embryos of the Dutian Liehuo Formation. Please come with me."
The 14 8.6-meter-high steel columns standing in the Zhang family's courtyard were so obvious that everyone had seen them outside. But at that time, they didn't know what they were: steel that had been quenched and then tempered in a fire environment.
The surface of the pillar is pitch black, and the Zhang family has not polished it, so it really doesn't have any brilliance of 'black iron'.
Zhou Jue stood under the steel column and looked up at the steel column. The shock in his heart was indescribable.
The diameter of one meter requires two people to hug it. The height of 8.6 meters is almost the height of five people.
These steel columns, weighing more than fifty tons, were just placed on the ground. After just one night, the ground was pressed down to a depth of one foot.
Gently touching and silently feeling these heavy 'iron pillars', Zhou Jue's heart was shocked more and more intensely. These iron pillars are made of black iron with a purity of 96%, and the structure is dense, and they are completely cast in one go.
I carefully pulled it with my nails, but it didn't move at all. Only a little bit of the black outer skin was rubbed off, revealing the blazing blue steel inside.
Zhou Jue was even more surprised. As a master in the middle stage of Nascent Soul, his nails were hard enough to cut gold and break jade. Ordinary, unforged dark iron was strong enough to leave deep cuts.
Unconvinced, Zhou Jue turned his true energy, and with a cold light shining on his nails, he grabbed at the steel pillar again.
But the next moment, Zhou Jue's face became distorted. His nails... were bent!
it hurts!
Covering his paws, Zhou Jue turned his head carefully to see if anyone saw his ugly appearance; he didn't want everyone to be stunned at the steel pillar in front of them, because no one would care.
Xin Han, the master of the Jiuyang Sect, was hammering with his fist, but the steel pillar of more than 50 tons did not move at all, and there was not even a sound.
After hammering for a long time, only part of the black outer skin was removed, revealing the blue-glow steel inside.
Zhang Xinhan took a few steps back, looked at the height of the steel column, and turned to ask Zhang Hao: "Do you really want to engrave the Dutian Liehuo Formation on it?"
"Yes. Sorry to trouble you, senior."
Zhang Xinhan nodded coolly, took out a sharp chisel with a flowing light, and chiseled away at the bottom of the steel column.
There was a clang, sparks flew out, and the tip of the chisel... broke!
Broken!
Zhang Xinhan looked at the chisel in his hand, and then at the steel pillar with only a little mark left on it, with an embarrassed look on his face.
Zhang Hao waited for a long time, but saw no words or movements from Zhang Xinhan, so he had to speak carefully: "Senior?"
"Ah..." Zhang Xinhan woke up with a start and stood up. He could no longer maintain his cool expression, "Why... why is the black iron so hard? My top-grade magic weapon-quality chisel even collapsed!"
"The quality of a top-grade magic weapon?" Zhang Hao was a little puzzled, "Our pillar only reaches the quality of a middle-grade magic weapon!"
Yes, Zhang Hao is sure that it has only reached the quality of a middle-grade magic weapon. Originally, Zhang Hao requested that it only be of low-level magic weapon quality. But Yu Yueyun insisted on refining the quality of a middle-grade magic weapon.
Zhang Xinhan was stunned for a moment and suddenly asked: "How do you define quality?"