When making zuò steam engine boilers before, Jiang Xingchen had already researched a new material, which had a good effect of high temperature resistance and oxidation resistance. However, when used to improve the ballista, it is somewhat unsatisfactory.

For a few days, Jiang Xingchen and Xian Ning completed dozens of proportions, and studied that the tension and elasticity of the alloy had indeed increased. But there is still a big gap from the goal he expected.

"Still can't do it!" After failing again, Jiang Xingchen sighed softly. His Matter Exploration Array is capable of detecting animals, plants, and even different types of rocks and soils. But it is not possible to go deeper, that is, it cannot be more refined.

Originally, he wanted to absorb the Yuan Stone in his hand first to see if he could improve the formation. But when he thought about the next use of Yuan Shi, this thought could only be dispelled. He's rich, but it's all in the desert yet. At present, more than 500,000 yuan of stone on the research institute side is used to make weapons.

And there is another point, even if the difference in the elements in the ore can be analyzed through the guò formation, it is difficult to extract. In the previous life, Jiang Xingchen knew that some rare metals were extracted from minerals in very small quantities. However, it is necessary to go through a series of complex processes, not only calcination, but also a reduction and replacement process, and some even require electrolysis.

"Xingchen, it can't go on like this!" Xian Ning heard Jiang Xingchen's sigh, and also stopped what he was doing, and said: "There are more than a dozen kinds of metals we know now, and there are too many combinations of proportions, and there is not enough time at all!"

"I'll think about it again! Xian Ning, you also stop and rest, in the past few days, my mind has become a mess, and it has become a mess!" Jiang Xingchen walked out after speaking.

He's just out of graduate school. Grandpa Fu came and said, "Sir." The dancing girl has arrived! and ......"

"Oh! They've arrived, in the Lord's Palace. I'll go over now!" Before Grandpa Fu finished speaking, Jiang Xingchen's eyes suddenly lit up, as if he had thought of something happy, his face was happy, and he sped up without waiting for him to finish speaking, and strode towards the lord's mansion.

"Uh!" Grandpa Fu was stunned, the lord is usually not like this, how could he become so excited when he heard that Qin Manwu was coming. And the top-secret letter that the marshal just came......

Jiang Xingchen ran all the way back to the lord's mansion, and Qin Manwu was watching Mei'er in the house! The little girl still hadn't woken up. The pressure she has been under this month has been too great, and she has endured serious injuries. However, what reassured Jiang Xingchen was that the old man had already determined that Mei'er's life was not in danger.

"Xingchen!" Seeing Jiang Xingchen coming in, Qin Manwu greeted him, and was just about to ask about the situation of the territory, when he saw Jiang Xingchen wave his hand, stop himself, and then went to Mei'er's side to tuck the quilt for her, grabbed himself and walked out of the back room.

For a while, Qin Manwu was a little stupid. Mechanically dragged out. Jiang Xingchen has known him for five or six years, and he has never had such an intimate action.

"Miss Qin, have you brought everything back?" When they arrived at the outhouse, Jiang Xingchen asked quickly. There was some urgency.

"With ...... Brought it back, it's all unloaded in the backyard!" Qin Manwu said stumblingly.

Just then, the door was pushed open. The old man walked in with a big grin and said loudly: "Boy, old man Fu said that the marshal ......."

Halfway through the conversation. The old man's voice stopped abruptly, and he stared at the two of them with wide eyes. At this moment, Jiang Xingchen was still holding Qin Manwu's wrist.

"That'...... Hey, hey. I didn't ...... anything See!" The old man blinked, turned and ran, and closed the door again.

Jiang Xingchen and Qin Manwu glanced at each other, only then did they react, and hurriedly let go and retreated.

Qin Manwu also seemed to be frightened, and swooped to the corner, clasping his hands in front of his chest, his face flushed.

"I'll it!" Jiang Xingchen looked at Qin Man's dancing appearance, the corners of his mouth twitched, obviously it was a misunderstanding, how did you do this, it really looks like what I did.

However, Jiang Xingchen didn't say much, and continued to ask, "Miss Qin, do you remember a piece of black stone?"

When he first passed by Hengqi Mountain, Jiang Xingchen found that the whole mountain was black rocks, and he thought it was strange, so he took down a piece and prepared to bring it back to study...... But after so many things happened, he forgot about this stone. He only remembered when he heard that Qin Manwu had sent the goods.

At this thought, the weeds in his heart began to grow wildly, and he always felt that this stone could play a role.

"Black stone?" Jiang Xingchen was so anxious, Qin Manwu was no longer embarrassed by what happened just now, thought about it and said: "I remember that there is, I saw it when I returned the goods, it seems to be in the backyard, with grape seeds. ”

As soon as Qin Manwu's words fell, Jiang Xingchen turned his head and opened the door and ran, heading straight to the backyard.

But as soon as he ran out of two steps, a figure suddenly flashed in front of him, and the old man stood in front of him: "Boy, wait a while!"

"What's the matter?" Jiang Xingchen asked.

"Hehe!" the old man smiled without saying a word, and he felt furious in his heart.

"What the hell is going on?

"Huh!"

"I'm too lazy to take care of you!" Jiang Xingchen was so angry that his forehead jumped blue, and he waved his hand and said, "I don't have time, don't bother me!"

"Boy!" The old man stopped Jiang Xingchen again, and finally stopped hehe, and said in a low voice: "It's not authentic for you to do this, Mei'er girl is still unconscious in the house, you ...... outside"

"Just your sister...... You old immortal!" Jiang Xingchen scolded angrily and kicked over. I'm in a hurry, this old thing is still joking.

The old man also saw that Jiang Xingchen was in a hurry, and he didn't dare to come over this time, seeing Jiang Xingchen run into the backyard.

After a while, Jiang Xingchen hurriedly ran out with the black rock in his hand, and without looking at the old man, he slipped out of the gate of the lord's mansion.

"This kid! there must be something to discover!" the old man smiled, took out a letter casually, and muttered: "What is the marshal's top-secret letter, should you open it and take a look...... Forget it, since it's top secret, let's wait for the little soul to see it for himself, so that he won't be mad again......"

For the next ten days, Jiang Xingchen never showed up again! Qin Manwu stayed for two days, and when he was almost recuperating, he left to return to the Great Qin Kingdom.

The two goods of Haksu stayed in the star collar, but they didn't even dare to go out of the door. I couldn't see Jiang Xingchen, not to mention, there were demon beasts everywhere outside, and as soon as he said that day, he ran into two big wolves, and he was so scared that he ran back.

Now this thing is wailing every day, when will I see Lord Jiang...... The only thing that made him a little satisfied was that the wine and food here were better than when he followed Jiang Gongzi's team!

During this period, the world shook, and the Qiankun Empire counterattacked, severely hitting the Eight Kingdoms! It was also during this period that Xingchen led everyone except for a few who were seriously injured and endangered, and the rest of the people's injuries quickly improved, and Mei'er also woke up.

During the same period, the Xingchenling steam engine began to operate at full capacity, and the craftsmen also worked day and night, and the parts assigned by Jiang Xingchen were produced in large quantities......

On the twentieth of January, in the real room of the research institute, Jiang Xingchen looked at the thin black and shiny metal in his hand in surprise, let out a long breath, and said with a smile: "It's done, it's finally done!"

For more than ten days, the researchers of the entire research institute devoted themselves to the study of black rocks. Since there was only one piece, they could only remove a very small part of it at a time.

In addition to calcination, Xian Ning and the researchers also used various solutions to replace the real yàn, some of which Jiang Xingchen didn't know, and it was obviously groped out by the researchers and Xian Ning Tongguò real yàn...... At this time, Jiang Xingchen discovered that after years of development, the Immortal Condensation Yàn Room already had a considerable level. If you don't have a plug-in, you probably won't be able to get involved.

Jiang Xingchen was very satisfied with such results, and only in this way could the real room play an important role in the construction of modernization in the future. Otherwise, you simply can't do it on your own.

After continuous realization, they finally separated a bright gray metal, very hard, and the melting point is also very high, Jiang Xingchen is estimated to be able to reach two thousand degrees, if it weren't for his temperature control pressure array, the current kiln mouth would not be able to reach it.

After successfully separating this metal, Jiang Xingchen immediately matched it with cold iron. It was found that just adding a little bit to it can greatly increase the strength and toughness of cold iron.

Now the finished product in his hand is bent to 60 degrees, and it can be automatically restored after two days.

"That's it!That's what we want!" Xian Ning said with a smile: "The newly discovered metal, you can give it a name!"

"Chromium!" Jiang Xingchen didn't think about it, and immediately replied. Although he knew that it was certainly not the kind of chromium on Earth. But in terms of function, it is very similar.

"Chromium, why is it called such a strange name, and how do you write it?" asked Xian Ning in surprise.

"What's that...... You want to know why it's called that?" Jiang Xingchen asked sternly.

"yes?"

Jiang Xingchen nodded and said, "Go back and all the researchers who participated in the real yàn, and each of them will be rewarded with three thousand citrine coins!" After speaking, he turned his head and strode out of the real yàn room.

"......" Xian Ning stood in place, looking at the direction Jiang Xingchen left, and did not recover for a long time. Let me give out a bonus, is this an answer to why you took the name chrome, are you teasing me......

But before long, the research institute erupted in cheers!

After Jiang Xingchen left, he immediately went to find the ribs, although the content of chromium needed in the ratio was very small, but the rock in his hand was not enough.

The ribs looked like they were hard, and they couldn't do anything else except for transportation, and the injury just happened to let me fly to the desert.

Jiang Xingchen has the means to resist this kind of situation, and as soon as the dragon blood is taken out, the ribs immediately become damp, and he chirps around Jiang Xingchen...... Jiang Xingchen looked at it and wanted to laugh, this product looks like an advertisement in the previous life, the waist is not sore, the legs are not painful, don't look at the injury, it is no problem to go up to the fifth floor in one breath......

After the ribs left, Jiang Xingchen only learned about the news outside! Only then did he know the top-secret letter from the marshal! (To be continued......