The bright noon sun shone on the open field of the steel mill, which had not yet been built, and fine dust in the air flew in the light.

"Let's go, I'll take you to see something."

Lin Mu has the heart to cultivate Lin Feng and make him the technical backbone of the military workshop, so whenever he encounters technical matters, he will take him with him.

Lin Feng looked at Lin Mu's back with admiration and followed closely, and the erudition that Lin Mu had shown in the past few days convinced him from the bottom of his heart.

Back at the Lin Mansion, Lin Mu asked Lin Feng to wait in the front yard and went to the secret pavilion in the backyard by himself.

Entering S City, Lin Mu came to a graphite crucible factory in the suburbs with ease, because the time in the space of S City is different from the outside world, he has enough time to find out the resources in the space, and now he basically knows everything about this place.

In contemporary times, graphite crucibles are widely used to smelt tool steel, gold, silver, copper, lead, zinc and other non-ferrous metals and their alloys, so the manufacturers of graphite crucibles are all over the country, and it is not surprising to find graphite crucible factories in S city.

The biggest obstacle to his establishment of a private military workshop this time was steelmaking, without which the quality of the guns produced was worrying.

In the middle of the nineteenth century, converter steelmaking technology has not been applied, and the world's most advanced steelmaking technology is still crucible steelmaking, and the crucible in this crucible steelmaking is graphite crucible, with this thing, he can refine high-quality steel with quality not lower than the level of the West in a short time.

Looking at the graphite crucibles piled up everywhere in the factory warehouse, Lin Mu took one out and returned to the front yard.

"Big brother, what is this?" Seeing Lin Mu struggling to hold a black thing that looked like a water tank, Lin Feng was surprised.

Putting the crucible down, Lin Mu said: "This is the graphite crucible, which is specially used to make steel. ”

With that, he took out another drawing, which depicted the process of making steel from a graphite crucible, which he found in a steelmaking book, and the original version was drawn.

Taking the picture and looking at it, Lin Feng suddenly had some itchy hands, and he said: "Big brother, I also know a little bit about this blacksmith work, try it now?" ”

Now that the Lin family's business is taken care of by Lin Qing and Lin Yang, Lin Muqing is idle, and when he has time, he naturally wants to build his own private military industry step by step, he said: "Of course, you can go find some wrought iron now, and we will smelt high-quality steel together." ”

Lin Feng was stunned for a moment, and he said; "Big brother, why do you use wrought iron? Pig iron doesn't work? ”

"No, it must be mixed with wrought iron and pig iron in a certain proportion." Lin Mu is ready to teach on the spot, "Whether it is iron or steel, it is actually an alloy of carbon and iron, pig iron has a high carbon content, so it is hard and brittle, wrought iron has a low carbon content, so it is soft and soft, steelmaking with pig iron must be decarburized, the steel frying method of the Hua Dynasty is decarburization steelmaking, skilled steelmaking must be carburized, graphite crucible can withstand a high temperature of 1,000 degrees, and it is also a carburizing agent, and pig iron is also used as a carburizing agent, so to produce steel with carbon content between pig iron and wrought iron, it must be the same as the three......"

Lin Mu and Lin Feng squatted on the ground, Lin Mu took a branch and drew the entire steelmaking process in a diagram, and at the same time handed over the specific carbon content of the steel to Lin Feng.

"I see." Lin Fengmao was stunned, he used to know the process of ironmaking and steelmaking, but he didn't understand its principle, and he just relied on the experience passed down by the blacksmith to make iron.

Now that Lin Mu said this, he instantly understood the principle.

"Go find wrought iron and pig iron first, and after the steel is smelted, I will give you the drawings of the blast furnace, and the rest will be left to you."

Lin Mu said with a smile, Lin Feng has excellent memory and understanding, if he is placed in modern times, he is definitely a top student in the science class, and because of this, he is very precious to this younger brother.

Now what he has to do is to hand over all kinds of technologies to Lin Feng, and when Lin Feng accepts the modern scientific system, he will take some professional books for him to learn by himself, after all, with a foundation, it is not difficult to understand these things, and besides, the level of science and technology in the nineteenth century is not too high, unlike modern high-precision and difficult to understand.

Lin Feng smirked, and immediately ran out, and soon he came back with a bucket of iron, and the two of them erected the crucible more than one meter high, and put the iron into the heat according to the proportion, in the process of steelmaking, Lin Mu taught Lin Feng how to use the flame of the crucible mouth and the shape of the molten steel to judge the carbon content of the molten steel according to the knowledge in the book.

This knowledge is a summary of the experience of generations of steelmaking workers in contemporary times, and it is generally not passed on in steel mills, Lin Mu searched for a long time in steel mills to find it, and with this steelmaking notebook, steelmaking is not a problem.

After tossing for two or three hours, in the evening the two of them poured the liquid molten steel from the crucible into the prepared mold, and when the cooling was over, a steel ingot appeared.

"Knock knock...... Lin Feng picked up the hammer and knocked the steel ingot a few times, and the crisp voice came far away, "Big brother, it's incredible, it's the first time I've seen liquid steel, with liquid steel, wouldn't it be possible to directly cast steel cannons with molten steel?" Lin Feng said excitedly.

Lin Mu nodded and said that he was right, in fact, before the eighteenth century, there was no liquid steel, all steel was basically solid steel that had been tempered thousands of times, and it was okay to forge swords with solid steel, but it was not easy to cast cannons and barrels, and it was precisely because of this that the crucible iron-making method would be precious.

In modern times, the German Krupp company was originally just a small blacksmith shop, doing some inconspicuous small business such as iron, until the old Krupp created the can steel method to make high-quality steel, this can steel method is crucible steelmaking, which shows the importance of steel.

Now that they have mastered the art of making high-quality steel, all that remains is to find a way to cast the molten steel into barrels and cannons.

For Lin Mu, this is naturally not a problem, these two things are nothing more than molds for molten steel casting, and it is no problem to find hollow steel pipe molds similar to gun barrels in urban space, as for artillery, iron molds need to be specially manufactured.

At present, the casting artillery of the Chinese Dynasty is still the traditional clay mold, the quality of the cannon body made by this mold is poor, and there are many cavities, so it is only necessary to let Lin Feng use the tool steel cast iron mold refined by the crucible to replace the clay mold, and the current West uses only the iron mold.

To solve the problem of steelmaking, Lin Mu gave Lin Feng the drawings of the blast furnace and the technology of smelting pig iron and wrought iron for him to ponder by himself, and at the same time explained that he did not need to worry about failure, just try boldly, and combine theory with practice to produce qualified products.

Lin Feng had long been fascinated by the new technology that Lin Mu taught him, so he naturally agreed.

"Uncle Zhang is recruiting blacksmiths, and everyone will listen to you as soon as they arrive, and you can also withdraw the money from the Hu Ledger Office, in short, as long as you can make guns and cannons, you want people to give people, and you want money to give money." Lin Mu patted Lin Feng on the shoulder, placing high hopes on him.

The civil officials in the court who can only put their mouths on the court can't save the Hua Dynasty, and only Lin Feng, who is engaged in industry, can give the Hua Dynasty a future.

Today they have high-quality steel, and tomorrow they will have a military-industrial giant that is not inferior to Krupp.