I was engaged in infrastructure construction in the Han Dynasty [Transmigration Book]

Literally understood, heat treatment is to heat gemstones, but it is not so simple and rough.

Liu Tan thought about it carefully for a long time, and felt that the heat treatment of gemstones might have something in common with blacksmithing.

So he directly asked people to send the mined tourmaline, um, the worst quality one to the blacksmith.

After the blacksmith got the tourmaline, he was terrified. He had never seen this kind of stone before, but it must be very precious for the king to see. What if he broke it?

In this regard, Liu Tan said directly: "Do it freely, you will not be punished if you do bad things, and you will be rewarded if you do good things."

Now the blacksmith is relieved, Liu Tan has always kept his word, and his reputation in the hearts of the people below is still very guaranteed.

Then Liu Tan got a pile of gravel.

He stared blankly at the tourmalines that were about to shatter into slag, and then at the blacksmith kneeling below, before asking for a long time: "This...is the temperature too high?"

It shouldn't be, how high the temperature can burn the stone like this?

The blacksmith's body trembled. Hearing Liu Tan's words, he felt his whole body go limp and almost fell to the ground.

He trembled and said, "No... no, it's the slave... the slave accidentally smashed the stone into pieces."

Liu Tan was full of question marks when he heard it, smashed it?How much effort did this take?

However, it is difficult to find out where the problem is with such a little bit of questioning. Liu Tan simply said: "You tell me the whole process."

Seeing that the King of the North didn't seem very angry, the blacksmith felt relieved, but he still stuttered when he spoke.

He began to say that it was quite normal at the beginning. He heated it first, using the ordinary heating iron procedure, but because the blacksmith didn’t know the melting point of tourmaline, and Liu Tan didn’t say to let the stone melt, so at the beginning After heating had no effect, he proceeded to the next step—forging.

When smelting iron, the carbon in the pig iron is chiseled out through this step, otherwise the pig iron is too hard and brittle, and there are many places where it is not suitable.

As a result, the chisel broke, and he chiseled the stone that had not been melted under the high temperature into broken stones. At that time, the blacksmith's legs were so frightened that his legs went limp.

Liu Tan: ...

He knew he couldn't do without watching!

It's a pity that Huo Guang strictly forbids him to enter any industrial production range, lest he get excited and do it himself.

Liu Tan had no choice but to say: "You don't need forging, just...forget it, I don't understand, you write down the steps of smelting, bronze smelting is also included, and then I will select you to do it."

The blacksmith looked innocent, he was illiterate.

Liu Tan had no choice but to let the blacksmith dictate, and then Miao Rui wrote it down. At the same time, he thought in his heart that if he continued like this, would he be able to start large-scale literacy soon?

No, no, you can't take too many steps, if you take too many steps, you may end up like Yang Guang.

Oh, he is better than Yang Guang, after all, there is Huo Guang beside him, and his own father on top, if he really does something wrong, someone will definitely stop him.

After the blacksmith finished describing all the steps, Miao Rui rearranged them in more elegant words before showing them to Liu Tan.

This time, Liu Tan took a systematic look at the steps of smelting, and skipped all the parts that needed shaping and forging, and focused on heating.

The heat treatment these days is actually not very perfect, but this imperfect heat treatment inspired Liu Tan, and gradually reminded him of what he had been exposed to when playing with models.

Then he wrote down the order of heat treatment for tourmaline according to the blacksmithing order.

The first is normalizing, which is a pre-heat treatment process. The heating temperature is not particularly high. According to the mark on the thermometer, it is about [-] to [-] degrees, and then heat preservation and cooling are carried out.

Then quenching and tempering are carried out. These two steps are basically the same as the current iron smelting, and then the quenching and tempering process is deleted. Oh, there is no quenching and tempering these years, which just saves trouble.

Finally, flame heating and surface quenching are carried out. Liu Tan was a little hesitant in writing this step. It is indeed necessary for steelmaking, but he does not know whether it is necessary for the heating of tourmaline.

After Liu Tan finished writing, he fell into deep thought while watching the process. He always felt that... this process seemed to be... useful in smelting.

Because he added a few more processes on top of the original smelting process, the only thing he didn't write clearly was the intermediate forging process.

But the forging process is hard and simple. If the conditions are not met, if you want to get steel, you can only repeatedly forge and continuously discharge the impurities in the steel, and it can make the composition uniform and the structure become More finer and finer grains.

After Liu Tan added the step of forging on another piece of paper, he sat there in a daze for a moment.

Is he...he figured out the forging method of Baisteel again?

This feeling is... quite familiar.

It's been a long time since he can always produce some by-products whenever he wants to do something, and it's strange to miss it.

Liu Tan had an idea, if he had Baisteel, he would be able to add something to Liu Che and Liu Ju's gifts when he went back.

He handed the paper to the blacksmith and said, "Get these two things out quickly, I will be of great use!"

The blacksmith froze for a moment after hearing this, didn't he still talk about stones just now?How come there is one more thing?

However, Liu Tan ordered him to go on, and he had to follow this.

In fact, no matter what, the most difficult thing is to sort out the production process. If you have a production process and follow that process, it will be easier.

Especially the tourmaline, the tourmaline, which was not of particularly good quality, has become transparent and beautiful after being processed. In addition, it is gorgeous and colorful, even a person like Huo Guang who is used to seeing good things around Liu Che can't help but be attracted by it .

Among the tourmalines of many colors, watermelon tourmaline is the most popular. Watermelon tourmaline is a piece of tourmaline with multiple colors, usually green and red, so it is called watermelon tourmaline. However, there is no watermelon these days. Liu Tan for a while I didn't know how to call this kind of tourmaline, so I simply said: "Let the father or mother give the name later."

He thought these two should be willing to give a name.

With such a processing method, tourmaline becomes very affordable, but it cannot be given to the rough stone at once, and it still needs to be processed.

Liu Tan's idea was to inlay a whole set of jewelry with tourmalines. Even if the queen had certain jewelry that she couldn't wear during Zhengdan, there were always frequent banquets at that time, so there was always a chance to wear them.

What kind of necklaces, bracelets, hairpins and earrings, Liu Tan also put in a lot of effort to choose. He is not good at color matching, so he simply chose pure red. Anyway, it is Zhengdan, what he wants is a celebration, and it is not suitable for cold colors in winter.

As for the style, he didn't care about it, and he didn't have a special research on jewelry, not to mention that the styles that are popular in later generations may not be liked by people in this era, so it's better to be on the safe side for a solemn occasion like Zhengdan.

Then Liu Tan selected the largest piece of tourmaline. This piece of tourmaline can be said to be the largest piece currently produced in the entire mining area. It is about three feet high and one foot wide. It is a very rare size even in later generations.

A tourmaline of this size is a rare treasure in itself, and Liu Tan didn't process it any further. He just had someone make a base for it to display, and this was for Liu Che.

Then he picked out some other tourmalines of good quality for setting, and these were used to set on the scabbard of the sword.

Baisteel now has the initial finished product, and Liu Tan is not particularly excited about it.

Because this method of steelmaking consumes too much manpower and material resources. Although it is very sharp, it is destined to become a luxury in the hands of nobles. If you want to promote it and equip all soldiers with such weapons, unless Liu Tan can find it A more time-saving and labor-saving method, or the population is large enough to supply production, otherwise it is basically impossible.

Not to mention the hundred steel making, even the harness has not been popularized until now, and it has become popular among the nobles. It is basically impossible for Liu Tan to fear that it will be stolen by the Xiongnu. Even if the Xiongnu got the production method, With the financial resources of the Huns and their poor smelting, it is even more impossible to equip all their cavalry with new-style horse gear.

However, after a while, Liu Tan may have the ability to replace the army of the northern border country, or the cavalry in those small towns on the border with new harnesses.

After all, he has a home in the mine. Although these are all his, and the harness needs to use the treasury of the Northern Kingdom, he pays taxes!

This is also the point that makes Liu Tan most satisfied with the big man at present. No matter who he is, he has to pay taxes. Of course, nobles and wealthy households have many ways to avoid taxes. There is no way to avoid this.

Anyway, as long as he doesn't avoid taxes, when the treasury is full, he will have money to do many things.

Thinking about it this way, it seems pretty good to get rich by relying on metaphysics. Originally, Liu Tan's plan was to make the living standard of the people in the northern border country reach the average line of the Han Dynasty after ten years.

To be honest, even Liu Tan didn't dare to tell others about this goal. If he said it, even Huo Guang would think that he was whimsical.

In the end, he didn't expect to shorten the ten-year time by relying on metaphysics. If this continues, maybe five years will be enough, and even if there are mines in other places, five years will not be needed.

Liu Tan was thinking about this while picking out a tourmaline. When he picked out a dark green tourmaline, he subconsciously asked people to use it to make wolf head earrings, and the eyes were inlaid with red tourmalines.

To be honest, when he ordered this matter, he was still thinking about the great cause of revitalizing the economy of the northern border country, so he said something almost subconsciously.

When everything was ready and placed in front of him, Liu Tan was stunned as he looked at the pair of wolf head earrings.

After hesitating for a long time, he ordered someone to change one of the wolf head earrings into a wolf head stud. After all, according to his observation, it seemed that only the left ear of Lu Xuan had a hole.

As for whether it is appropriate to give the other party earrings, he thought about it and thought it was better than giving a finger ring or a bracelet—well, these days, bracelets are actually a very common accessory for men.

After the tourmaline jewelry is finished, the briquettes to be brought to Chang'an are almost done, because it is just for display, so the first batch does not need to bring too much, and it will be fine to send it over later.

At this time, it was time for Liu Tan to lead the people on the road.

This time, except for Jiang Chong and Sang Qian who stayed behind, everyone talked to Liu before going back. Everyone seemed very excited. Although they hadn’t been in the northern border country for a long time, everyone had done a lot, and Liu Tan was generous. , and rewarded everyone with a lot of things, including a lot of tourmaline and coal, which are special products of the northern border country, and they can be shown off when they are taken back.

Only Jiang Chong and Sang Qian stayed behind. Compared with Jiang Chong's excitement about being the master of the house, Sang Qian looked a little sad.

He also wanted to go back to Beijing, and he even thought that after returning to Beijing this time, he wouldn't come back even if he played around in front of his father!

In the end, I didn't expect that without him in the quota of returning to Beijing, he still has to work here as a coolie!

Even if he doesn't have to work under Liu Tan, what if he can be on his own?He is just an agent. When the talents sent by Chang'an come over, won't he still have to abdicate to make way for the virtuous?

Sang Qian almost cried at the thought of this, but in order not to let Liu Tan find out, he had no choice but to wipe away his tears and said, "Your Highness, I miss you."

Liu Tan was shaken numbly by him, and he stopped the hypocritical farewell, turned around and got into the car, he should leave quickly.

Traveling in winter, even if you reach Liu Tan's status, you will have everything, and it will make you feel uncomfortable.

When he finally saw the city wall of Chang'an City, he finally breathed a sigh of relief, turned around and rode on the little white horse, and walked towards Prince Liu Shi who came out of the city to meet him.

Everyone was surprised that Liu Ju went out of the city to meet the King of the Northern Territory in person. Before that, he went out of the city to meet Liu Tan because Liu Tan was an envoy.

This is the one who really deserves to be dispatched by Liu Ju himself.

Now... the princes and kings return to the capital, do they need the crown prince to welcome them personally?

But Liu Ju didn't care what others thought, he just applied to Liu Che, and Liu Che agreed!

Liu Tanjiao walked over and said, "It's cold, why did His Highness come in person?"

Liu Ju looked at Liu Tan, and found that although he had only seen each other for a few months, his younger brother seemed to be more mature than before, and the contours of his face were more distinct. His eyes were round and round because of surprise, um, it was still the same. Pretty and cute.

Liu Ju resisted the urge to reach out and rub his younger brother's head, and said with a smile, "It's not too cold, it just so happens that I haven't been out of the palace for a long time, so I came out to relax my muscles and bones, um, is it just brother?"

Liu Tan said: "Huh? No, there will be Huo Guang and the others."

Liu Ju shook his head: "No, what I'm talking about is... Didn't you meet Xiao Kunmi on the road?"

Liu Tan: "Huh?"