Chapter 147: Liquid nitrogen cooling steps

In the next hour or so, various steps including cold and heat treatment began, and Ye Fan was also orderly directing.
Until the last cold treatment process was completed, the molten steel in the pot was still dark red and the temperature was very high.
"Just wait until the cooling is completely completed, and then we can know whether the forging is successful after testing." At this time, Ye Fan also secretly thought.
"Now let's start the cooling process." Ye Fan said to Lin Wei after estimating that the time was almost up.
"Ah? Boss, this...this is not in compliance? How can it be cooled directly in the crucible? If it solidifies by then, it will be a big iron ingot!
This thing weighs more than ten tons, and it will be a problem to carry it. It has to be cut into pieces before it can be rebuilt. Lin Wei was stunned for a while.
To be honest, he has been eating this bowl of rice in the heavy industry for so many years, and this is the first time someone has made such a wonderful request.
But it was his boss who made this request. He did not do it, nor did he not do it.
"Don't worry, as I said, you guys, start the cooling process, directly load the liquid nitrogen, and get a bonus." Ye Fan commanded several workers casually and said.
"Good boss!" The workers saw that the biggest boss had all spoken. How dare you not listen, they immediately walked out of the second division, started to command a few forklifts, and brought a few barrels of liquid nitrogen.
And the master responsible for operating the machinery did not stop, but carefully manipulated the machinery that controlled the crucible, and stopped the large crucible firmly on the ground.
At the same time, terrifying temperatures began to fill the ground.
If it is calculated in accordance with the normal operating rules, this is absolutely an illegal operation. If it is seen by the authority, it may be punished severely.
At this time, Ye Fan in the operating platform on the second floor of the factory could clearly feel that the surrounding air temperature had risen a little.
Because the heat is emitted upwards, and their second floor is like a barbecue rack.
According to the normal operating rules, the molten steel in this large crucible should be immediately poured into the corresponding module and cooled into steel, and finally processed and shipped.
At this time, there are already several masters who wear thermal insulation suits to isolate the heat and oxygen cylinders to resist the harmful toxic gas emitted by the high temperature of steel.
After all, when accidents occur in many steel mills, the molten steel in the large crucible at the top is all poured on the ground. At this time, the air temperature is almost a thousand degrees.
Many people who are too late to escape are often not scalded to death by molten steel, but because the hot air breathed into the lungs and the respiratory tract burned to death.
Lin's Heavy Industry has also done this kind of drill before, so oxygen cylinders are available, and liquid nitrogen is purely for accelerating cooling, or in extreme cases, it is dedicated to rescue.
Therefore, Ye Fan's request today can be found on the spot in almost all of the factory, instead of buying it outside.
Several masters were operating five forklifts, and began to pour liquid nitrogen around the large crucible to reduce the surrounding heat.
When the five large liquid nitrogen buckets began to pour out liquid nitrogen, the ground of the entire plant was filled with smoke, as if it were a fairyland on earth.
In the smoky center, the pot of molten steel emitting a dark red light still showed no signs of cooling.
Why not just pour liquid nitrogen into the crucible and seek faster cooling, but slowly cool down on the ground around the crucible, and then start to cool down on the surface of the crucible, always keeping the molten steel inside?
People who have studied physics know that the thing about molten steel is the liquefaction of steel at a high temperature of several thousand degrees, and the temperature of liquid nitrogen is more than 200 degrees below zero, which is completely two extremes.
What are the consequences of extreme cold + extreme heat?
explosion!
If you pour liquid nitrogen directly into the molten steel in the crucible and live a long life, you can give it a try.
So the cooling method they adopted was to slowly cool down from the crucible's surroundings, and finally to the surface of the crucible.
Because steel conducts heat very fast, when the temperature on the surface of the crucible has begun to drop, it means that the temperature inside has almost dropped.
"His..."
At this time, the entire first floor of the second partition was almost covered and covered by the white liquid nitrogen smoke. The experienced teachers, relying entirely on their own instincts, were driving the forklift in "blind exercises."
And Ye Fan on the second floor also clearly saw that as the temperature slowly dropped, the color of the molten steel in the crucible began to gradually dim.
From the dark red at the beginning, to light gray, and after the final cooling, it became a deep black.
This makes these liquid metals look as deep as obsidian, which is completely black, as if the eyes are closed.
After half an hour of cooling and the volatilization of liquid nitrogen, the plant in the second zone has completely returned to normal.
"Presumably the molten steel in that crucible has completely turned into a big iron ingot. I really don't understand what the boss is doing with these things."
"Yeah, if we really want to make such a big iron ingot, we have the ability to make it out. We only need to pour it into the corresponding module and forge it, but the boss today let it cool down directly in the crucible.
Tsk tsk, now if you want to take out the iron in the crucible, I am afraid that the whole crucible will be smashed. This will cost more than one million more for no reason. Do you think the money of the rich is really just that? Used it to burn? "
"Whatever so much, anyway, the boss asks us to do something, we do it right, anyway, there is a bonus, but this is an illegal operation, and most people really don't dare to do it, so the bonus is what we deserve."
....
At this time, several workers were whispering.
But Ye Fan didn't bother to care about them. Even if Lin Wei commanded a few masters, he moved over a large square frame, 3 meters long, 3 meters wide, and 20 centimeters high, and it was flat on the ground.
"Pour molten steel into it." Ye Fan said to the operator who manipulated the crucible.
"Huh? Boss~EbookFREE.me~, where did the molten steel condense and become a big iron ingot?" At this time, the operator was also taken aback, and then looked at it with a dumbfounded look. Ye Fan.
"Okay, don't talk nonsense, just follow the normal process, and work quickly." Ye Fan waved his hand impatiently.
You must know that this is the first time he has refined liquid metal, and the quality of this batch of metal is still to be studied.
At this time, the operator was also operating the machinery, pouring the molten steel cautiously as if it were normal, even though he knew that it could not be poured out at all because it had solidified inside, but for him, just do as the boss said.
However, in the next second, the entire staff suspected that a scene of life had appeared.
"What? Isn't it frozen? Why can it be poured out?"
"No, you are sure this looks dark, like ink, is the molten steel we just cooled?"
"Fuck, molten steel at room temperature? What magical operation is this Nima?"
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