Wang Xuexin was called by Zhang Wanhe on the seventh day.
This is because Su Xin and others discovered during the previous toughening process of Bai Xin that using local stewing technology can improve the toughening effect of the shell shell.
The so-called "simmering" refers to closing the stove, keeping it warm for a period of time, and then letting it cool down naturally.
The entire stewing process takes three to four days, plus the previous burning and heating, a total of six to eight days for one toughening.
Since white heart toughening can achieve better results by doing this, it is natural to use black heart toughening.
This also made Wang Xuexin lament that the wisdom of the masses is infinite. The toughening technology from Germany and the United States coupled with the local fire-stewing method is a veritable combination of foreign and domestic, a combination of Chinese and Western.
The person who came to inform Wang Xuexin was a security guard.
Tunnel warfare is a high-level secret, and even Zhang Wanhe has no access to it and can only report it through guards.
At that time, Wang Xuexin and Lao Hei were studying how to dig tunnels in the mountain.
The tunnel system is much more complicated than the tunnel, and it also cooperates with the tunnel, so it is not that easy to mess with.
Upon hearing the guard's report, Wang Xuexin dropped his hoe and hurried to the stove area in the north of the village.
When I arrived at the place, I saw that Zhang Wanhe, Su Xin and other directors had been waiting there anxiously. They shouted to Wang Xuexin from a distance:
"Xiao Dongbei, I'm waiting for you!"
"The first furnace will be opened today, everyone will be worried if you are not here!"
"I don't know if the toughening will work this time. Why aren't you in a hurry?"
…
The nervous look on everyone's face really sounded like an elixir was coming out of the oven.
Following Zhang Wanhe's order, the master shoveled off the seal and opened the oven.
Because the simmering technology allowed it to cool down naturally, the inside had dropped to normal temperature. Several people helped the master to lift the iron box out smoothly from inside.
After removing the sealing mud from the box mouth and opening the lid, everyone's eyes lit up.
The broken iron pieces laid on the top layer are somewhat different. I can't tell what the difference is, but it just feels more like steel.
Zhang Wanhe slowly pulled apart the broken iron and refractory bricks covering it with his hands, holding it in his mouth as if muttering to himself: "Don't worry, don't worry, we have to look inside to find out.
It’s been so many days, no...no less than this moment..."
Although he said this, the hand holding the poker was trembling.
As the refractory bricks were broken open, the sides of several shell shells popped out. Everyone let out a soft cry, and saw that the shell shells exuded an attractive silver-gray metallic luster, which was not seen in Baixin Toughening before.
Su Xin, who had long been prepared with a notebook, said excitedly while writing: "In box No. 1, none of the five shell shells in the first layer has oxidized and peeled."
Zhang Wanhe took the tongs and carefully tapped the shell shell, and then tapped it again. Then a smile appeared on his face and he said: "I guess this matter is not gone!"
The hardware was relatively sensible, he said: "What the hell, I still need to turn it on a machine tool before it counts!"
"Let's drive!" Zhang Wanhe raised his head confidently and said, "I guarantee it will work!"
It turned out just as Zhang Wanhe said. After putting one on the machine tool cart, Hardware nodded and said: "The toughening is even and the toughness is moderate. It is much better than the white heart toughening!"
The crowd burst into cheers.
Zhang Ruozhong danced and took off the peaked cap on his head and threw it high into the air.
The medicine jar rushed up and held Wang Xuexin's hand tightly, and kept saying "Thank you, Comrade Wang Xuexin, thank you!".
Zhang Wanhe gently stroked the shell shells in the iron box, his face full of kindness and smile, as if he were stroking the back of his child's head.
When I looked at Su Xin, I found that she was secretly wiping tears.
"Hey..." Wang Xuexin said with a smile: "Is it worth it? Isn't it just toughening technology? If you don't know, you might think someone is bullying you!"
When everyone saw Su Xin's appearance, they started laughing.
"Of course you can't do it!" Su Xin replied with red eyes and a cry in embarrassment: "You just solved it with a few words, while others have been struggling for many years and still haven't figured it out!"
Zhang Wanhe comforted him: "Okay, haven't we got it done? Just get it done!"
Then Zhang Wanhe seemed to have remembered something and asked: "No one wants to see what the grenade is like?"
In fact, you don’t need to look at it. The shell shell is toughened like this and is no different than a hand grenade.
The main reason is that this operation does not burn directly in the fire like white heart toughening, and there is no peeling of the oxide layer, so the weak parts of the groove are not easily burned through.
As expected, the grenades were all intact and shining with a metallic color.
The next work is easy. Stuff the gunpowder inside, install the wooden handle and the fuse, and the grenade is assembled without much effort. Then comes the problem of experimental testing.
Another benefit of black-core toughening technology is that the size can be estimated.
The previous white heart toughening technology had oxidative peeling to varying degrees... Although some shell shells cannot see oxidative peeling, they have actually peeled off or a small amount of peeling cannot be detected by the naked eye, and the actual size has changed.
So even if the cannonballs are all the same size when they go into the furnace, they will be all kinds of strange when they come out of the furnace. One hundred cannonballs have one hundred sizes.
This will cause great difficulties in the production of artillery shells and even artillery...all of which require manual measurement, classification and matching. A small amount of production is okay, but when there are too many artillery shells, it becomes an almost impossible task.
Black-core toughening does not have this problem. After toughening, the size is fixed and predictable.
Through measurements, Su Xin found that after sand casting, the volume first shrunk by 1%, and then expanded a little more after toughening, and the volume expansion also varied with the degree of toughening.
Insufficient toughening results in less expansion, less neutral carbon precipitation, and the shell is hard, brittle, easy to crack, and difficult to process.
Excessive toughening will cause more expansion, excessive neutral carbon precipitation, which affects the strength, the shell will become crispy, and it is also difficult to process.
So Su Xin made a card-gauge sample. During operation, you only need to stuff the toughened shells into the card-gauge sample. If it is larger or smaller, you will know immediately whether the degree of toughening is insufficient or excessive.
The requirements for grenades are not as strict as those for artillery shells. Whether they are larger or smaller, whether they are crispy or crispy, it does not matter much. After the experiment, the killing radius can actually reach 6.5 meters, which made Su Xin and others happy for a while.
Zhang Wanhe was so proud that he immediately called Li Yunlong: "Old Li, aren't you waiting to collect the rent? Hurry up, I won't wait for anyone!"
With that said, Li Yunlong hung up the phone without waiting for a reply.
Zhang Wanhe felt so proud!
Look at you, Li Yunlong, saying all day long that if I make a grenade in the border area and explode it in half, it will delay things.
Now it explodes into dozens of pieces, which is not much worse than the Japanese grenade.
This time I want to show you, Li Yunlong, how you can swallow back those words you said before!