I! Pretending to Be Reborn, Director of Doomsday Hoax

"Austenitic steel can be designed in the form of three alloys."

"The first type is Fe-Cr-Ni alloy. This form has better low-temperature toughness, corrosion resistance and processability, and should be used in various cryogenic technologies!"

"The second type is the Fe-Cr-Ni-Mn and Fe-Cr-Ni-Mn-N systems."

"The third is the Fe-Mn-AI system."

Zou Botao wrote vigorously, and recorded all the steel materials that Xu Qiu mentioned on paper.

"Director Xu, what about the second point?"

Xu Qiu took a sip of tea and said, "In addition to the toughness at low temperature, there must also be a construction strength of 50 meters to 100 meters underground!"

"After the sun goes out, there will be continuous snowstorms year after year, the snow layer on the surface will become thicker and thicker, and the weight accumulated on the main structure of the dungeon will also increase!"

"So, this kind of steel also needs to have extremely high strength!"

"The third point, at a low temperature of minus two hundred degrees, this material needs to maintain the stability of its own structure."

"Fourth, it has good weldability and formability."

"The construction of the dungeon only lasts for one year. We must complete most of the construction of the dungeon within one year. Otherwise, when the sun goes out and the soil freezes, it will be as difficult as heaven to start construction!"

"Therefore, the processing difficulty of this kind of steel cannot be high."

"Fifth, it needs to have extremely low magnetic permeability and cold shrinkage!"

Xu Qiu closed his eyes, his mind was constantly screening the austenitic steel,

In the end, the Fe-C "-Ni-Mn-N austenitic steel stood out!

In this form of austenitic steel, due to the addition of nitrogen, the strength of the entire steel will increase, and more importantly, it has extremely low magnetic permeability!

Especially 0Cr21Ni6M n9 N and 0CH6Ni22M n9 Mo2,

Even at the ultra-low temperature of minus [-] + [-] degrees, it can also be used as a non-magnetic structural component!

Xu Qiu's eyes became deep,

In the coming year, this austenitic steel will become the most eye-catching building material in the construction of super dungeons!

Raspberry Country.

Although they didn't know what the Dragon Kingdom was going to do, the president and others decided to send a team to follow in the footsteps of the Dragon Kingdom and build a dungeon.

Several top international geologists, physicists and architects gathered in a suburb of New York.

This is the place they think is the most suitable place to build a dungeon after surveying dozens of cities.

However, after several days and nights of discussion, this group of top scholars finally finalized the final plan,

On the first day of construction, we encountered a series of troubles!

Wendy, an expert in rock mechanics, said puzzledly: "The main theory to build a dungeon is rock mechanics. However, our discipline has only been developed for more than 100 years, and there was no systematic rock mechanics system until the 90s of the last century!" "

"It can be said that the development of rock mechanics today is very immature. We put too much emphasis on ideal conditions, oversimplify calculations, and rely too much on experience."

"Moreover, the theoretical knowledge of rock mechanics is not complete enough to support and guide practice!"

The geologists present were also silent.

They feel that building a dungeon is simply a fantasy.

Architect John Xun said: "Most rock engineering cannot be successfully excavated once. Due to the nonlinearity of rock materials, their state after stress has a loading path, so each excavation will affect the next excavation. Dig to make an impact!"

"Different construction sequences and different excavation steps have different final mechanical effects!"

"The impact of each excavation is complex and uncertain. Based on existing theories, it is no problem to support an underground parking lot, an underground commercial street, and a subway, but... the underground city, God does not Will agree with us!"

Wendy nodded approvingly: "Yes. I don't know exactly how Dragon Kingdom does it, but if we are to build a dungeon, we must have a deeper study of rock mechanics and more systematic guidance theory, greater computing power, and more accurate survey technology!"

John Xun added: "There are more rigorous construction methods, more advanced operating machinery, and a richer ... material foundation!"

These scientists, whose academic achievements are one section higher than those of Longguo, are standing at the construction site at a loss.

They couldn't imagine what it was that gave the scientists and construction workers of the Dragon Kingdom the courage to dig into the earth's core and build dungeons

Looking for flowers, evaluation votes!monthly pass!beg! ! ! .

Chapter 45 Is it possible to dig through the center of the earth?

Six o'clock in the morning.

Liaodong Qinggang Group, the workers came to the first-line factory excitedly, with excited smiles on everyone's face.

"Double salary!"

"What's twelve hours? If it weren't for my body, I'd like to work 24 hours a day!!"

"I heard that our group has received a batch of orders from the country, and we just need to produce steel as hard as we can, as much as the country wants!"

"Good guy, what is the country going to do with so much steel? Is it related to the previous dungeon?"

"It must be related! Don't talk about it, I'm going to work. The salary is double on weekdays and four times on holidays!"

"Right, I don't care so much. I still have a wife and children to support at home, and my mother is not in good health. As long as you give me money, I will be willing to enter the smelting furnace!!" The workers worked enthusiastically.

This scene appeared in steel factories in many cities across the country.

A large number of steel products have been released and piled up in the warehouse, waiting to be called.

In the morning, exactly nine o'clock.

A message was sent again from the Dragon Kingdom Strategic Crisis Bureau.

[Decree of the Emergency Bureau: From now on, the national railway transportation channel will be suspended.All trains, high-speed rails, light rails, maglev trains, etc. are suspended, and those who have already purchased tickets can be refunded for free!People across the country are requested to return to their place of residence as soon as possible, after a week, air and land transportation channels will also be closed]

As soon as this news came out, the whole country was shocked! !

"Railways are closed?!"

"What do you mean, we can no longer use high-speed rail or train for travel?"

"All railway transportation channels have been requisitioned! Combined with the characteristics of railway transportation, the transportation volume is large, the speed is low, the cost is low, and there is no climatic condition restriction...The country wants to transport bulky and heavy goods on a large scale?"

"It's related to the dungeon again!"

"What kind of dungeon the country wants to build is too important!"

On a certain website, several questions rushed to the top of the hot search list in an instant.

"How is the construction progress of the Shuguang City construction area? What do you think of the country's sudden development of Sanjianghe City?"

"Recently, the country has carried out a series of measures around the construction of underground cities. What might be done?"

"How difficult is it to build an underground city? Why does the country do such a thankless thing?"

And a popular science topic also rushed to the top of the hot search in the first place.

"What is the deepest underground distance that humans have explored so far, and is it possible to drill through the center of the earth?"

Zhang Boheng, a famous geologist and science fiction writer, received tens of thousands of likes for his answer.

[Zhang Boheng]: "The deep exploration of human beings can be traced back to the period of Su Lian.

In the last century, the Berry people landed on the moon, and Su Lian, who was one step behind, was very unwilling, so she gathered thousands of scientific researchers to prepare to penetrate the earth one step ahead of the Berry country.

At that time, everyone was very curious, digging to the center of the earth, whether there is a certain point, after this point, the gravity is reversed, and you can go to the other end of the earth! "

"At that time, human exploration of the underground stopped at the Moho surface of the formation."

"Let me briefly mention the Moho first. This is the interface that divides the crust and the mantle."

"The Moho is an abrupt boundary, marking changes in chemical composition and crystal structure!"

"And the most dangerous thing is that magma has begun to appear in this layer, and this magma can flow. The movement of the continent is also related to this flowing magma. The entire continent, just above these magma, is slowly moving towards a certain place. Defensive move!"

"This is also the principle of the plate drift theory!"

"The temperature of the magma on the Moho surface is about [-] degrees, and magma will erupt at this level at any time to form lava. This is a major difficulty restricting human exploration to the center of the earth."

"Su Lian was stimulated by Berryland's landing on the moon, and launched the 'Kola Ultra-Deep Drilling Project' to break through the Moho surface at any cost, and entered 10,000 taels kilometers underground, leaving the deepest pit in the world here. Hole!"

"However, in the 90s of the last century, a strange thing happened to this [-]-meter-deep well... After that, almost overnight, all the workers, scientists, and engineers, It was all moved, and the well was poured with concrete and completely sealed!"

"Someone later revealed that this well dug through hell..."

"It is said that people have captured many strange sounds from deep wells. They are wailing, screaming, and whipping sounds from hell, and the workers who went down the well saw with their own eyes flying out of the high-temperature gas drilling hole. A demon with wings!"

"And not long after that, Su Lian disintegrated."

"Back to the topic!"

"The deepest underground exploration by human beings is the depth J2, 262 meters of the former Suliankola ultra-deep drilling!"

"For comparison, the average altitude of a manned passenger plane in the sky is 1000 meters, and the Kola ultra-deep drilling has already exceeded this altitude in the ground!"

"Next, I will give you a very interesting cold knowledge of popular science!

Chapter 46 The era of major infrastructure construction is coming, an era of infinite possibilities!

In addition to being a geologist, Zhang Boheng is also a science fiction writer, so he has a strong interest in this area of ​​knowledge and is highly professional.

"Next, I will give you a very interesting cold knowledge of popular science!"

"[-] meters is the depth of an ordinary tree."

"[-] meters is the usual depth of a coffin buried in the ground."

"Six meters is the maximum depth at which a metal detector can detect a signal."

"20 meters is the depth of the underground catacombs in Bali. This catacomb is also an underground tunnel in Baiqi State, with a total length of 320 kilometers. The remains of nearly 6 million people are buried in it, but it is only open to the public for two kilometers.

99

O

"A little deeper, 40 meters, here is the deepest swimming pool in the world."

"100 meters is the depth at which humans bury nuclear waste. In theory, ten meters underground is enough to avoid nuclear radiation. A large-scale explosion, at most seven to eighty meters, can completely avoid the effects of nuclear radiation."