I! Pretending to Be Reborn, Director of Doomsday Hoax

"Generally speaking, impact toughness and yield strength are two performance parameters that restrict each other. If the yield strength is good, the impact toughness may be poor, and vice versa."

"However, the martensitic steel rail realizes the mutual transformation of impact toughness and yield strength, and it is the absolute top of the steel rail in terms of strength and toughness!"

"It uses high-plasticity alloy steel. After warming and pressing, the performance of the material changes, forming a performance gradient distribution from the top surface to the ground."

"After our test, the 750Mpa from the bottom to the top gradually increased to 1180Mpa at the top, and the yield strength also increased from 440Mpa at the bottom to 950Mpa at the top!"

Xu Qiu nodded: "This technique is worth learning."

With master-level mechanical knowledge, he is also familiar with steel and other forging techniques, and can easily understand the various processing methods that He Yude and other engineers say.

"There is also a kind of steel rail, which is the most advanced and has the most application value in the 21st century."

He Yude continued.

"Bainite rail."

"This kind of steel, known as 'the rail miracle of the 21st century, has high strength, toughness, high wear resistance and excellent surface damage resistance. The wear life is eight times that of traditional hot-rolled steel rails, and its fatigue resistance is traditional. Seventeen times the rails."

"As long as a little modification is made to improve the cold resistance, the bainitic steel rail can shine!"

Xu Qiu's face finally looked better.

Based on bainitic steel rails, if improvements are made to add extreme cold resistance, this kind of rails does fully meet the standards of extreme cold rails for nuclear power trains.

Wo Chengwen stood up and said, "Director Xu, Mr. He is in charge of raw materials, and I am in charge of various forging techniques."

"I summarized the typical composition system and performance of steel rails used in freight railways and passenger railways, and summarized some key technical problems in the production processes of steel rails such as smelting, continuous casting, and hot rolling."

"With the development of railways, the quality requirements for rails are getting higher and higher. As the speed of the train increases, the life of the rails is getting shorter and shorter. . . . The inherent defects of traditional technology have been exposed..."

"For example, the asymmetry in geometric dimensions, the height of the rail, the low width of the bottom, etc., the scratches and decarburization on the surface, the flatness of the appearance and the blind area of ​​the internal quality inspection, etc., all seriously hinder the improvement of the quality of the rail.

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"And the extremely cold rails this time are ultra-high-standard steel that humans have not been able to manufacture so far, so they have put forward extremely high requirements in all aspects!"

"The rails produced by the traditional die-casting process cannot meet the requirements for the dimensional accuracy of the rails for trains under minus [-] degrees, or the requirements for internal quality and mechanical properties."

"In order to meet the needs of performance and life, and mainly to improve cold resistance, I think forging and rolling should be used instead of casting!"

"And among them, the use of universal rolling technology to manufacture steel rails is worth trying in terms of component system development and manufacturing technology!"

After Wo Chengwen finished speaking, he exchanged glances with He Yude, and then said, "Director Xu, our Capital Iron and Steel Group is processing several batches of steel at the same time. know...can you come with us?"

They heard that Xu Qiu's knowledge of machinery is also very advanced!

Wo Chengwen's teacher is Xu Fu, the academician who designed the Longguo standard EMU, the third-generation Fuxing, and is now in charge of the development of the nuclear energy difference engine!

According to Xu Fu, there is no one in the world who is more talented and capable of mechanics than Xu Qiu.

"Lead the way." Xu Qiu stood up.

Li Bingqing followed closely behind, keeping up with Xu Qiu.

The Emergency Bureau is about two hours' drive from the new site of the Capital Iron and Steel Group.

However, two military helicopters landed directly on the roof of the crisis bureau building. These were special planes specially approved by the military department and prepared for Xu Qiu.

On the way, Xu Qiu talked about the way the track was laid.

"Nuclear trains, the way I intend to lay them is a new structure similar to existing tracks."

Wo Chengwen was surprised, "You also have research on track laying?"

"Something to do."

Zou Botao next to him had a toothache.

When Xu Qiu talked about physics at that time, he also said that he had dabbled in it, and the result directly showed the amount of physics knowledge that even he, a Nobel Prize winner in physics, could not match!

Wo Chengwen expressed his incomprehension, and said: "There is no track, it can avoid the splash of the track, it has good smoothness, good stability, long service life, good durability, less maintenance work, and the train can run at a speed of more than 350 kilometers per hour.

"The main advantage of existing rails is that they are cheap, but compared with the non-vulcanized rails, the plane geometry is not easy to maintain, the service life is also very short, and the maintenance and repair work is very heavy!"

"If the extremely cold steel rails are really developed, and the existing rails are used... a lot of repairs will not be easy to carry out under the extreme cold on the surface!!"

The so-called trackless track is a track structure that uses concrete, asphalt mixture and other integral foundations to replace the modern loose-grained gravel track bed.

The Youzuo track is the track covered with loose stone bed under the steel rail, usually also called gravel track, which is one of the main forms of track structure.

Youzuo track is actually a commonly used solution before the 21st century. It is often related to outdated technology and steel craftsmanship that cannot keep up. At that time, Longguo was too backward and had to adopt Youyao track!

However, with the increase of the national power of the Dragon Kingdom and the improvement of science and technology, the technology of smelting steel and iron has gradually caught up with and surpassed the international level. The more advanced cable track has long replaced the trackless track and has become the main way of laying urban railway tracks. !

Why.....to adopt the old track?

Zou Botao's eyes gradually lit up when he heard this.

Of course he knew Xu Qiu's reason!

When discussing how to solve the problem of thawing and frost heaving on this track, Xu Qiu proposed many solutions, the most important of which was to lay crushed stones under the track subgrade.

The gap between the broken stones can store more cold air, which can ensure that the roadbed is always under severe cold and will not melt easily!

The trackless track is an integrated structure of concrete and asphalt mixture.

Moreover, concrete and asphalt mixtures will change in nature when they are below minus two hundred degrees, and they are very prone to cracking!

Take concrete for example,

According to the relevant winter construction regulations, the pouring temperature of concrete should not be lower than 5 degrees Celsius, and the raw materials of the concrete even need to be heated and stirred or stirred with hot water.

Once the temperature is below zero, it is necessary to add antifreeze admixture to the concrete when mixing the concrete, and to take insulation measures after the concrete is poured, such as using greenhouse insulation or using plastic film and multi-layer straw curtains to cover insulation and other methods.

The extreme cold of two hundred degrees below zero, the concrete... can't bear it at all!

On the contrary, there are gravels from yesterday's track, which can just play the role of cold air to reinforce the severe cold of the roadbed.

Natural crushed stone can also resist the change of nature caused by cold!

Xu Qiu didn't explain too much. Wo Chengwen and others only needed to produce the extremely cold steel rails. The laying structure of the rails had nothing to do with them.

Wo Chengwen said: "However, if you use yesterday's track, the cost will be reduced a lot!"

"Take the Yongtai Railway near our Capital Iron and Steel Group as an example. The total length is more than 200 kilometers. The track construction is carried out according to the most advanced long-rail track-laying unit in China. It uses a unique track-laying technology-500 meters long. track-laying technology!"

"With this technology, it only takes two hours to lay a 500-meter-long track!"

"In addition, it uses seamless welding on the basis of the non-job track, and the joint is so smooth that almost no gaps can be seen. Driving on it is equivalent to driving on a complete rail, which is stable and quiet!"

"The final investment reached 1603 billion yuan!"

"However, if we adopt a structure with Zuo orbits, it may cost about 1503 billion yuan, which can save more than one billion yuan!"

Xu Qiu smiled and shook his head.

The extremely cold steel rails that can meet the driving requirements of nuclear-powered trains require an incalculable amount of money.

This is a very large train with a length of 120 meters, a width of 20 meters, and a height of ten meters. It can even be regarded as a moving building!

Even, because of the full load of goods, the weight of each car of the nuclear-powered train far exceeds that of a building!

The weight of a general train is between 120 tons and 130 tons, and the final Shaoshan Type 180 improved locomotive has a total weight of only [-] tons!

As for the nuclear-powered train, under the empty state, the weight may have exceeded 100 million tons, or even more...

The entire nuclear power train includes the front, car body, bogie, vehicle connection device, brake device, vehicle internal equipment, traction drive system, nuclear energy kinetic energy conversion system, reactor, cooling system, and automatic control system, etc... ..

The structure is very complicated, and any machine has been modified for cold resistance, and its weight has been improved.

And the ice-breaking locomotive with its 25-meter super-large ice-breaking blade alone may have weighed more than a thousand tons...

At the same time, the protective layer of the entire train from the inside to the outside, including the nuclear power furnace layer, the alloy thermal insulation layer, the cold insulation material insulation layer, the laser equipment insulation layer, and the outermost super cold insulation material outer cladding, etc.,

It also made the weight of each carriage reach a rather terrifying value.

120 meters long, 20 meters wide, and [-] meters high, such a behemoth has too high requirements for the track!

1603 million yuan?

For this track, if [-] million yuan is thrown in, it may only lay a few hundred meters.

This is... a nuclear-powered train track that needs to be built by the whole country!

wow wow wow.

The helicopter blades rotated at high speed, making a sound of breaking wind.

Fifteen minutes later, everyone arrived at the Capital Iron and Steel Group.

Xu Qiu's plane landed, and after getting off the plane, Xu Qiu looked up at the sky. There were a total of ten fighter jets, which were on alert at all times to ensure his safety.

And as Xu Qiu fell to the ground, the entire Capital Iron and Steel Group was also surrounded by special police.

"This is... the treatment of people at the Zhenguo level." Xu Qiu said silently in his heart.

Today, he is too important to Longguo!

Holding the basic blueprint of the super dungeon in his hand, all the construction of the dungeon needs to pass the review and approval of Xu Qiu before proceeding.

The planner behind the demolition of national houses and the replanting of farmers' grain is Xu Qiu.

Xu Qiu is also the mastermind behind the development of nuclear-powered trains and extremely cold steel rails!

Once something happened to Xu Qiu, the entire country and all previous efforts would be in vain!

Because all these projects and all the measures were released and connected by Xu Qiu, and only Xu Qiu has the complete construction methods of various projects!

Rumble.

As soon as he entered the iron and steel casting workshop, a violent heat rushed over.

Xu Qiu looked over.

White steam is boiling, and gears and large machinery are turning.

The newly produced steel is sent to induction heating, then put into the press, after three forging processes, and finally for the final forging......

The finished forged steel enters the automatic transfer device and waits for the performance test of the inspectors.

"In this steel production line, there are a total of four teams developing several subtypes of bainitic steel rails."

"Of course, this subspecies is our own name."

"There is no subspecies of bainitic steel rails in the world, but in order to adapt to the cold resistance and great load-bearing capacity, we need to improve the existing bainitic steel rails!"