"Come on, talk to your grandfather......"

Seeing his grandson, Zhang Zhao immediately smiled. It's not that he likes to praise his grandson, Zhang Han is really not bad, not only does he take care of his family well, but also vigorously improves the art of steelmaking. Sometimes, Zhang Zhao will also wonder if Zhang Han is an immortal reincarnated into the Zhang family. Zhang Zhao doesn't care about this, what about the immortals, he is not his grandson.

For more than ten years, Zhang Zhao and Zhang Hanzu have gotten along very well and have a deep relationship. Zhang Zhao was surprised and delighted by his grandson's foresight, and if he wanted to achieve a career, he would not succeed without this kind of scheming. Since then, his observation of Zhang Han has not only the intention of re-examining his precious grandson, but also the meaning of investigation. So far, Zhang Zhao is basically satisfied with his grandson's performance.

"Yes, grandfather."

Zhang Han smiled and saluted Zhang Zhao, and then gave Xiang Rang a salute, and then put down the ring-head knife in his hand - the decoration of the knife is very simple, the scabbard of cooked cowhide, the handle of the knife wrapped in fine hemp rope, after a little inspection, it is very simple, but the long knife of more than four feet is still quite eye-catching.

Zhang Han poured a good wine for Zhang Zhao and Xiang Rang, and poured himself another glass - this wine is getting more and more flavorful. Like Zhang Zhao, he also doesn't like spirits, pure grain soju, buried in the ground for more than a year, gentle in the mouth, with a hint of grain mellow, very suitable for his taste. This thing is not the same as alcohol blending.

After a few words of gossip, Zhang Han took the knife. Well done, not as good as said. He tossed for another seven days, re-refined some hard steel, used the hundred refining method, and made this treasure knife, which was to be used to 'offer treasure'.

As soon as Zhang Zhao pressed the circlip, the long knife was unsheathed, and the black knife body was covered with beautiful patterns, flashing with mysterious blue light under the illumination of the afternoon sun.

The blade was passivated by Zhang Han with green alum oil (concentrated sulfuric acid), and a dense ferric oxide film was formed on the surface, and then soaked in boiling soapy water for saponification, and finally soaked in hot linseed oil, which is conservatively estimated to not rust in three or five years.

Zhang Han was very proud of his blue hair, but Zhang Zhao didn't know why, looking at this beautiful and mysterious long knife, he couldn't help but feel a little more awe.

The knife is used to make it, Zhang Zhao looked at it for a while, stretched out his hand and straightened the hair down - the saying of blowing hair and breaking hair is very popular in the Han Kingdom.

Zhang Han smiled and watched his grandfather try the knife there, as soon as the knife came out, he tried it, not to mention blowing and breaking hair, it was an ordinary fried steel knife, it was also a wave or two, but he didn't lose anything.

said that he wanted Li Shengzhong to rest for a few days, but as a result, Zhang Han came to the door on the third day and tossed for seven days in a row to build this knife.

Due to the low carbon content of the filled steel fragments used as raw materials, the crucible steel is very soft. Li Shengzhong had to go and refine a few more pots of crucible hard steel.

According to Li Shengzhong, hard steel should be forged into small pieces first, stacked and forged, and then folded horizontally and vertically 24 times, and then mixed and forged with soft steel, folded 12 times repeatedly, in order to achieve a treasure knife.

To put it bluntly, this is the famous 100 steelmaking technology.

Zhang Han couldn't wait that long. His original intention was to hold a physical object, which was more convincing. He didn't really care about the sword. So, under his oppression, Li Shengzhong muttered in his heart "spoil things", so he simply used soft steel and hard steel to cooperate, three layers of stacking and forging (generally 30 layers), horizontal and longitudinal folding three times, and then three times repeatedly, quickly became this treasure knife.

Fortunately, the steel is good, the craftsman is good, and the quality of the knife is also very good.

Li Shengzhong fought casually, and he achieved a treasure knife, and he thought about it if he was serious...... I can't help but have itchy hands. Zhang Han has refined these steels, and it is useless at the moment, he just wants to refine them first. Therefore, Li Shengzhong strongly asked to create a few treasure knives, and Zhang Han also responded half-pushed. In addition to asking to keep some of the steel for backup, Zhang Han left it to Li Shengzhong.

Zhang Han's inattention is mainly based on the issue of efficiency - quantity over quality is the general trend, not that Zhang Han is not interested in the treasure knife. As a boy, Zhang Han has been practicing martial arts for ten years, and to this day, he still carries a weight of sixty pounds, and it is strange that he is not interested!

By the way, when Li Shengzhong was quenching and tempering, Zhang Han had no room to open his mouth at all. He knew two kinds of quenching fluids – urine and fat from livestock. However, Zhang Han has already seen the performance of the workshop blacksmiths in this regard.

That night, Li Shengzhong demonstrated to him a third method - he applied a layer of powder to the body of the knife, and then covered it with a thick layer of 'mud', and then put it in the stove. While observing the flame with all his attention, he tested the temperature of the water with his hands, and instructed his son to add hot and cold water to adjust the temperature.

Li Shengzhong's net worth and life are entrusted to Zhang Han's hands, and Zhang Han far surpasses him in smelting steel, so Li Shengzhong does not avoid Zhang Han when he fights knives.

In the mist, Zhang Han witnessed the birth of a treasure knife. He was very curious about what Li Shengzhong had done, but he didn't ask. If he asked, Li Shengzhong would not refuse, but he would feel a little uncomfortable in his heart. Anyway, the person is his, and Zhang Han is not in a hurry, sooner or later he will know.

After Zhang Zhao tried to blow the hair and break his hair, he tested the sharpness of the blade with a big hair, and the bamboo pen was silently broken into two, and he didn't feel resistance in his hand.

Zhang Zhao felt that this knife was extraordinary, and searched around, but there was really nothing suitable for testing the knife in his house.

Zhang Han came to 'offer the treasure knife', and he had already prepared for this. He took two steps forward and pushed open the window, Liu Wenbiao had already set up two targets in the courtyard, a piece of wood with a thick diameter and a slightly thinner bamboo tube, which was full of iron beads.

……

After Zhang Zhaoshuang passed, he packed up the ring head knife, and in a blink of an eye, he restored his decrepit image of being polite and polite, as if Zhang Han was dazzled by his vigorous posture just now.

Taking advantage of Zhang Zhao's impress, Zhang Han seized the opportunity to state his 'great achievements' in smelting.

Zhang Zhao smiled, listened to him, nodded approvingly, he enjoyed the atmosphere very much, since Zhang Han went to the clan study, it has been a long time, and he has not spoken properly. It wasn't until Zhang Han's narration came to an end that Zhang Zhao came back to his senses.

"Well, what are your plans?"

Zhang Han was very unwilling. However, despite the fact that steel is the skeleton of modern industry, it really has little use in the agricultural era. The only thing that requires a lot of steel is to make weapons – and even the steel used for weapons is limited. Moreover, the Zhang family is not yet able to brazenly produce weapons in large quantities.

It's really unpleasant to be able to make high-quality steel, but it can't be used and can't be used. However, Zhang Han has thought about it repeatedly, and it can only be like this. At most, make three or five treasure knives, crossbows, treasure armor, etc., keep two for yourself, and take the rest for gifts.

"Grandchildren think that the Zhang family has never sold ironware, and now they don't have to sell ironware......"

The Zhang family has enough things to make money, and it's not bad at all. Iron smelting is always more sensitive, quite similar to the military industry of later generations, and the Zhang family is already eye-catching enough, so there is no need to be in the limelight here.

"Judging from the current situation of the Zhang family, there are several main aspects of iron use.

The most used iron is agricultural tools. Farm tools do not need good steel, most of them use wrought iron, and only in parts such as the tip of the plough are a small amount of fried steel.

……”

There are almost no requirements for iron in agricultural tools, and they can be treated as before. It's negligible here. Other places where steel is used include mining and domestic soldiers.

In these two places, the requirements for steel are much higher. Mining tools need to be sturdy and durable, and weapons are even more demanding. Both have always been major consumers of steel speculation in the past.

Now, of course, these are not problems.

Now, the Zhang family has the ability to replace it with better tools and weapons.

Zhang Han also knew that the technology of manufacturing crucible steel must be kept secret, and it must be no fun. The key is, whether to replace it with steel-filled manufacturing?

From the point of view of confidentiality, it is natural not to replace it. However, the replacement is bound to increase the combat effectiveness of the family soldiers and improve the efficiency of mining.

Zhang Han explained this meaning clearly, Zhang Zhao was also a little hesitant, there were pros and cons to this matter, he had to weigh it.

"Xiaohan, how many people know about these steelmaking techniques?"

This has to be thought about, Zhang Han recounted while recalling.

"Hmm......

There are more people involved in the steel frying technique. This, it is estimated that it cannot be hidden from the people in the workshop, and everything you want to know can be known.

Steeling, only the crown is all six of them...... No, it was seven people involved, all experienced blacksmiths, and I told them not to talk nonsense.

Crucible smelting steel, because the furnace is to be burned, there are more people present, not to mention dozens of people.

However, only the six uncles (Zhang Tingfang) and Li Shengzhong's father and son have a comprehensive understanding of the whole process. There are more people who know about the steelmaking process, there are six people; The only people who know how to make crucibles are Li Shengzhong and Tao Zichun (a good hand at making ceramics). Liubo should know some, but won't know the details.

I've already brought back the recipe and the experimental records, and I've told the three of them not to ask any of them, and there shouldn't be a problem.

……”

When Zhang Zhao heard this, he nodded approvingly.

The king does not lose his country, and the minister does not lose his body. That's as it should be. Zhang Tingfang won't ask, if Zhang Tingfang inquires, it will be his fault.

[Be kind, read a book and smash the ticket]

PS: There is still ...... at night Oh, it's Sunday, so, two shifts in the evening, and half a chapter will be updated at twelve o'clock.

By the way, I forgot to mention something, do you have any extra monthly passes...... Sweat! It's not that I want to.,Yueguan is impacting the highest monthly ticket (probably this thing),If you have,Please, go and vote.,A while ago, Yueguan helped to publicize.,Gave me a lot of help.,I hope to do a little bit.。

After the vote, I came back and said, there is no other thanks, ten essences are offered.

I wanted to say a few more chapters, but recently, the speed of the code word has been mediocre, and I really don't dare to say this. Anyway, if I can do more, I will definitely do more. Please.