I! Pretending to Be Reborn, Director of Doomsday Hoax

The process of producing steel rails is very complicated. There are more than a dozen processes from steelmaking to delivery.

Blast furnace blowing, molten iron pre-desulfurization, extraction, converter smelting, LF refining, RH vacuum treatment...

Among them, the step of light rolling steel requires seven large-scale equipment.

And every batch of steel rails made must go through strict testing, not only to check the external dimensions, but also to check whether the content of chemical elements meets the standard.

Since quenching and blowing are not easy to improve, can you try to start with the step of rolling to further improve performance?

09

Wo Chengwen's words made everyone think.

The engineers of the Capital Iron and Steel Group are all top experts in the steel, train and other industries, so they are naturally extremely proficient in this area.

Soon, a person stroked his chin and spoke thoughtfully.

"I worked in Liaodong Qinggang Group for a while, and I saw a rolling method there."

"This method is ingenious and can improve accuracy, development success rate, and greatly shorten the product development cycle."

Wo Chengwen's eyes glowed, "Tell me the specific method!"

The special engineer nodded and stated:

"This rail rolling method includes the rolling process in the BD area and the rolling process in the universal area."

"We all know that the last pass in the BD area is the pilot hole, and the first pass in the universal area is the universal roughing hole."

亠“而他们的标准当中明确规定了，对于43kg/m~75kg/m规格的钢轨，应用同一BD区工艺轧制钢轨的参数范围为：轨底宽差△DW5mm,腰厚差AE<5mm, 轨高差△Cs25mm。"

"The transition from the pilot hole to the universal rough-rolling hole needs to meet the requirements: the abdominal cavity width L is -3mm~+5mm, the radius difference between the leg-waist connection arc and the head-waist connection arc R<10mmo"

"A pair of legs. The inner single-slope rail, the difference between the inner slope of the pilot hole leg and the universal rough-rolled hole leg is five degrees to eight degrees, and the opposite leg. The inner double-slope rail, the inner slope of the pilot hole leg and the universal The slope difference inside the rough-rolled hole leg is three to six degrees"

"He recalled Jianxi's data, and under the guidance of his words, everyone seemed to have started rolling the rails in their minds.

Five minutes later, the super engineer ended his memory and said with fiery eyes:

"According to this rolling process, we can greatly shorten the product development cycle, and the development time of new products can be shortened by about half!"

"We are running out of time now. We must complete the development of the extremely cold steel rail within the remaining two days. We must speed up the progress!"

"Of course, more importantly, we... can use this precise rolling process to obtain rails with better performance!" Everyone was thinking.

Their eyes unconsciously drifted to the fiery red molten steel, in which new hope was bred, a brand new steel alloy.

Now, they are only one step away from making this kind of thing.

Another engineer with a moustache cleared his throat and was about to offer his opinion.

He is a young engineer who joined the Capital Iron and Steel Group ten years ago. He is only 51 years old this year. Compared with those present, he is considered a young man.

However, his past research experience is quite admirable.

Many of the steel rails used in the railways and high-speed railways in many first-tier cities over the years were designed and manufactured by him.

This mustache, in terms of ability, is not much worse than the old men here!

As soon as he opened his mouth, everyone's thoughts were pulled back.

Since Xu Qiu appeared, everyone began to subconsciously pay more attention to the voices of young people.

The reason is simple. They realize that young people's thinking is not completely rigid, and they can often come up with some very interesting and imaginative ideas.

"Seniors!"

The mustache said with a serious face, "My idea is not the rolling method, but to improve the aluminum and carbon content of the surface of the rail, and use the principle of infiltration and carburizing to improve the corrosion resistance and decarburization of the surface of the rail." Ability and cold resistance, impact toughness!"

"This rail production method has been widely used in the manufacture of corrosion-resistant high-speed railways."

"The specific method is to use the waste heat of rail rolling to apply an accelerated cooling operation of [-] degrees Celsius per second to the rail. After the heat treatment operation, use the waste heat of the heat treatment of the rail to spray hot molten aluminum on the surface of the rail."

"After a special process, the surface layer of the finally obtained rail is rich in corrosion-resistant aluminum layer, which improves the comprehensive performance and surface corrosion resistance of the rail."

"I have used this process on a subspecies of bainite steel, and the final test shows that the carbon content of the rail steel is 0.311%, the tensile strength is 500, 900Mpa, the elongation is greater than 10%, and the corrosion resistance is also quite excellent! "

"At that time, I just conducted the experiment at will as a new attempt. If we conduct it again in a systematic and standard way, the steel rails produced in this way may be more superior!" After listening, everyone agreed with this method.

Suddenly, He Yude reacted.

They seem to be.....so far off!

Whether it is heating, rolling, cooling, straightening, or blast furnace blowing in the process of rail processing and manufacturing, hot metal pre-desulfurization, lifting, converter smelting, LF refining, RH vacuum treatment, etc., they are all far behind!They need a whole new system, a total upgrade!

But now, there is no time at all!

At this moment, He Yude felt a sense of despair in his heart, his eyes were distracted, and he was extremely depressed.

They... still overestimated themselves!

The manufacture of steel rails, from induction heating to feeding into the press, the three-step forging process, they have achieved meticulous attention to detail.

In order to obtain high-performance steel, they adopted various methods during the casting process.

For example, in the pretreatment of molten iron.

The main purpose of hot metal pretreatment is to further reduce the content of harmful impurities in hot metal before smelting.

Wo Chengwen and others carried out desiliconization at the blast furnace taphole, and pre-dephosphorization and desulfurization in the molten iron tank car.

Moreover, they found in the process that the iron and steel sulfide inclusions in the pot are the direct cause of metal rust and corrosion.

In order to ensure that there are no cracks inside the billet and no impurities are mixed in, they tried their best to control the sulfur content within [-]%.

Moreover, they also specially introduced the out-of-furnace refining technology from Liaodong Qinggang Group to further adjust the composition and temperature of molten steel, reduce harmful impurities, and ensure the precise composition of molten steel when tapping.On the basis of the original three-step forging process, they also carried out vacuum degassing on the molten steel, which further reduced the content of hydrogen, oxygen and other gases dissolved in the molten steel, reducing the impact of these gases on the properties of the rail steel.In the process of vacuum degassing, they also unexpectedly found that deoxidation can significantly reduce oxide inclusions in steel, improve the degree of dispersion of the structure, and shorten the distance between pearlite sheets.

Therefore, deoxygenation and dehydrogenation are carried out simultaneously, and Wo Chengwen proposed the "limestone enhanced boiling method", which uses enhanced boiling limestone for dehydrogenation.

He Yude said with misty eyes, "Not long ago, we were still studying the way of adding alloy elements and rare earth elements..."

"After summarizing hundreds of processes, I finally came to a conclusion:"

"The plasticity of pearlitic steel is mainly related to the lamellar spacing of pearlite, the diameter of pearlite pellets and the grain size of austenite, among which the lamellar spacing of pearlite is the main controlling factor..."

"So we controlled it and added alloying elements Si, Mn. C" and so on to the pot. Under the same cooling rate, we got a finer pearlite structure and improved the strength!"

"We thought that after reaching this conclusion, we were getting closer and closer to the development of extremely cold steel, but only now have we discovered that it is too difficult!"

Everyone also felt the sense of despair.

Wo Chengwen, who had been silent all this time, suddenly raised his head, with a gleam of hope in his eyes, and asked, "Do you still remember, Director Xu, who once designed a pouring system for us, overcoming more than ten types of bainitic steel subspecies? question!"

"Does he have a way to build a new rolling mill production line for us!"

"We have almost explored the various parameters of the extremely cold steel rail, such as chemical composition, constituent elements, rare metals, etc., but now, what we lack is the craftsmanship!"

"In the whole world, I am afraid that there is no rolling mill production machine, and no country can have such an advanced technology that can develop the extremely cold bainite steel in our theory!!"

"But what if Chief Xu has a solution?"

At this moment, hope suddenly rose in the hearts of everyone.

He Yude smashed his mouth, his heart was beating violently.

This man who is always creating miracles, the father of the Dragon Kingdom dungeon, the father of the nuclear-powered train, really has a way?

Wo Chengwen patted the steel plate next to him and shouted: "Comrades, you can't give up, absolutely can't give up!"

"We are only one last step away, a final step!"

"Ask Director Xu for help, the great father of the dungeon!"

He Yude's old voice sounded, and he said, "I'm ashamed that I can't share Director Xu's worries."

"However, thousands of people in the Dragon Kingdom and a thousand underground cities rely on nuclear-powered trains to communicate with each other. It is a matter of people's livelihood. We can only ask Director Xu for help!" All the engineers showed ashamed expressions on their faces.

Wo Chengwen took out a pen and paper from his office, and wrote down the letter of request for assistance.

He Yude and others signed on it one by one.

Ten minutes later, the letter of request, signed by a team of more than 10 top engineers from the Capital Iron and Steel Group, reached the crisis bureau.

"Need a new rolling mill line?"

Xu Qiu looked at the documents delivered by Lu Guangyuan with a pensive expression on his face.

Zou Botao asked in shock: "Even the more than 20 national treasure-level engineers of the Capital Iron and Steel Group can't solve it?"

The Capital Iron and Steel Group represents the highest level of iron and steel smelting in Longguo, and the engineer who can hold an important position in it also represents the highest authority in iron and steel smelting and rail development in Longguo.And now, they're all stumped by the same problem.

Zou Botao is a physicist and doesn't know much about the technology of steel rails, but through this request, he probably understands the situation.

Now, Wo Chengwen, He Yude and others have completed 90.00% of the research and development progress of the extremely cold steel rail.

Only the last kick.

The point is that this last kick is crucial, and it can even be said to run through the entire rail development process.

Because.....it's a rolling production line!

What they lack is an advanced technology. From refining, continuous casting to rolling, any process requires a more sophisticated and complete processing system!

This kind of thing is the highest crystallization of wisdom that can only be developed by a country and an industry for decades. How could it be possible for one person to come up with it in a short time?

Zou Botao has a deep sense of powerlessness, which is the same feeling of suffocation and helplessness when he touches the vast universe and touches the boundary of physics.

He felt very frustrated and said: "Director Xu, a production line is the result of millions of people in the industry studying day and night, and their request...somewhat unrealistic."

"If it really doesn't work, we're afraid we'll have to overthrow the plan for the nuclear-powered train as a whole and replace it with another means of transportation."

"For example, imitate the eagle country and build giant ships!"

"The giant ship that breaks the ice will not need rails!"

Xu Qiu said indifferently: "The development of extremely cold steel is not only related to the extremely cold steel rails, but also involves all aspects of human machinery after the sun goes out!"

"Even for a giant ship, its shell needs steel materials that can withstand extreme cold."

"There is also the Wind Dragon Project. If the people from the Energy Bureau give enough shocking and feasible design drawings of wind turbines, but we have not even been able to produce extremely cold steel, the precious design drawings will become waste paper." , Xu Qiu's voice became high-pitched, and said: "We can't live in the dungeon forever, one day, we will return to this beautiful land, our Shenzhou! "

"When a hundred years later, or a thousand years later, our descendants return to the home that has been frozen by ice and snow for so long, and look at the well-preserved tables, chairs, and unclean dishes." This—Tian Shao will come! ..

"We will eventually have to face the problem of developing extremely cold machines. We cannot leave this difficult problem to future generations."

"Go out, let me think about it."

Xu Qiu closed his eyes, leaned back on the chair, and fell into a state of deep thought.