The earth-based steelmaking in the Chinese Yuejin era was a small blast furnace made of clay and bricks, and due to the different standards of carburization, the bubbles in the steel were too large and the structural strength was low.

This situation is like a reinforced concrete concrete column, if the sand is uneven in size and mixed with soil, the cement will be unevenly distributed, and if there are bubbles, the strength of the rigid column must be very low.

Moreover, the temperature of the steel does not meet the requirements, and the steel smelted cannot meet the standard.

However, no matter how bad the earth-based steelmaking technology of the Chinese Leap-Forward era is, it is much stronger than the otherworldly process steel-frying method, that is, the forging iron technology.

The content of carbon determines the mechanical properties of steel, the higher the carbon content, the greater the hardness, the greater the strength, but the plasticity and toughness decrease.

Take homemade noodles as an example, flour is like iron, salt is like carbon, adding a small amount can make the flour have gluten, as the saying goes, "salt" is the soul of noodles, but too much salt, the worse the gluten may be.

Eggs have protein, it is like the alloying elements in steel, adding eggs to flour can make the noodles elastic, and the same suitable alloying elements such as chromium and manganese play a strengthening role in steel.

Pig iron with a carbon content of too much 2 is too hard and brittle, while wrought iron with a carbon content of less than 02 is too soft but has excellent plasticity.

Steel with a carbon content of about 1 is ordinary structural steel, and its strength and plasticity are relatively balanced, and the carbon content of steel bars used in construction is about in this range.

If you use pig iron as building steel bar, the high-rise building will definitely collapse easily, and some vibrations will crack; if you use wrought iron to make building reinforced concrete slab, the steel is not enough, and the middle of the floor slab will definitely be concave and soft.

"Young master, is it good that the carbon content is about 1, will we control steelmaking in the future?" Li Gang was a little puzzled.

Mo Mo smiled: "Of course not, different carbon steels have different properties and different uses." ”

Mo Mo told the story eloquently, giving many examples.

Just like the base of the machine tool, it does not require plasticity, but requires high carbon content, and the high carbon content is high, so the wear resistance is better and shockproof. Another example is knives, the carbon content is too low, the hardness is not reached, and the bones will be dull.

Mo Mo said: "When we make steel, due to various restrictions, we can only smelt a few types of steel first, such as knives and ordinary steel for construction, and the others are not considered for the time being. ”

"Young master, you know so much at a young age. After your correction again, I felt that the mouth suddenly opened and I understood a lot. Li Gang said with a smile, he really admired it, and his admiration was difficult to express.

Fang Shi said: "Yes, after the young master said, I, a layman, have a deep understanding of the carbon content of steel, and I can't imagine that ironmaking is so profound. ”

"We're just scratching the surface, just scratching the surface. Mo Mo said with a smile, steelmaking is too complicated, and it has not yet penetrated into the macro aspect, so he suddenly said to Fang Shi, "It's not just steelmaking, it's the same in every industry, the more you study it, the more you feel that you only know a little bit about it." ”

"The young master taught me a lesson, thank you for the young master's teachings. Fang Shi said with emotion from the bottom of his heart, and Li Gang said yes.

Mo Mo waved his hand and said, "You're welcome, in the process of speaking, sometimes I can sort out my own clues, and I may find some problems." ”

"As the leader of various departments and the guide of various industries, you must pass on your knowledge to the people below without reservation in your work, don't treat it as a family heirloom, for fear that the apprentice will learn to starve to death to the master, in my place, there is no such problem, and when I am free, there will be some incentives for the master. ”

"Also, the information I gave is not necessarily correct, you must have the courage to ask questions, dare to practice, don't be afraid to spend money, many new technologies are made with money, not discussed. ”

Mo Mo was like a teacher, while two middle-aged men in their forties and fifties were like two elementary school students, listening respectfully to their teachings.

Li Gang asked curiously, "Young Master, what steelmaking level can our 100 steel-making probably reach your family's, and how big is the gap?"

Mo Mo sighed and said, "Luoyun Country doesn't pay attention to science and technology, and I don't know much about other countries.

There are too many industries related to steelmaking, and if the relevant industries fail to develop, then the level of steelmaking is extremely difficult to improve, and it will not reach the level of my family for 10,000 years.

If it is developed normally, it may be a difference of several hundred years. Sometimes, development depends on the wedge. ”

The level of steelmaking in the other world is similar to that of the Ming Dynasty in China, and the best is the hundred steelmaking.

100 steels use iron sheets with high carbon content as the cutting surface, and iron sheets with very low carbon content as the blade to ensure toughness. It is heated to about 1,000 degrees and then constantly folded and forged to aid in the diffusion of carbon.

Bailian Steel is suitable for making knives, but it is not suitable for other machinery manufacturing.

If you want to make steel bars for steel structures and ordinary structural steel for welding, then the other world can't make it.

The human history of the Heavenly Spirit Continent has been more than 3,000 years, but the level of steelmaking is still at the level of block ironmaking, which is hundreds of years different from the earth.

Although the technological development of human beings is advancing, if the related industries cannot develop, the development of steelmaking technology will also encounter bottlenecks, such as the electric furnace of steelmaking cannot be used without electricity, it is difficult to build a blast furnace with a heat resistance of thousands of degrees without clay bricks, and there is no automatic control without electronics, and the quality of materials cannot be inspected normally.

The development of civilization, especially science and technology, is a progressive process, and the accumulation of foundations requires a stable environment.

If one lives a turbulent life of precariousness, displacement, and death hanging by a thread, it is impossible to achieve great discoveries.

There are too many kingdoms in the Heavenly Spirit Continent, there are constant wars, and there are demon beasts that are difficult to resist and may invade humans at any time, so it is extremely difficult for human beings to unify, not to mention the vastness of the Heavenly Spirit Continent.

In addition, the human beings of the Heavenly Spirit Continent advocate force more and take the direction of force, so that the development of science lags behind.

"Oh, I see. After listening to Mo Mo's explanation, Li Gang understood a lot.

At the same time, Li Gang and Fang Shi felt that the young master's family was even more mysterious, and it seemed that it was an incomparably more powerful existence than the royal family of Luoyun Kingdom.

Mo Mo looked at the time, just talking about steelmaking for an hour, forgot to get down to business, changed the topic and said: "Okay, I didn't call you here today to talk about steelmaking, that one is far from us, we have to do things step by step, and solve the refractory bricks first."

Of course, there are certain benefits to understanding that refractory bricks are used to build blast furnaces for ironmaking. ”

Mo Mo wants to use a blast furnace to make iron, this is because the blast furnace can ensure the ironmaking temperature, otherwise the general furnace temperature is only 1300 degrees Celsius, and it is impossible to really reach 1550 degrees Celsius for melting steel.

The level of ironmaking in the other world is the level of block ironmaking.

To make a blast furnace, there must be refractory bricks first, otherwise the general material cannot withstand the melting temperature of steel, that is, 1550 degrees Celsius, or even slightly exceeded.