Chapter 38 (2/2)

But the pot has been smashed. Now it's too late to say anything. I can only watch these iron pieces start to smoke in the gradually red pot

To be honest, Shi Xiong has never done this kind of work. When he was a child, he had seen how to make iron in the local blast furnace in the countryside, but he had never seen how to melt the pig iron.

He can only do it by imagination.

Fortunately, although the clay crucible he made was very ugly, it was really resistant to burning. The five wooden men took turns to pull the bellows. The air from the outlet of the bellows entered the bottom of the furnace through the air duct. Immediately, the flame of the coal began to change from dark red to orange red, then to yellow white, and finally to dazzling white.

For the change of flame color corresponding to the temperature change, the stone bear heart is also more spectral.

As a cultural relic expert, he is very clear that before the invention of thermometer, the ancients created a method to judge the temperature by observing the temperature and fire color in the practice of smelting metal.

”Wood plane, watch this color, this dark red flame, the corresponding temperature is about six hundred...”

”Now the flame is crimson, and the temperature is about seven hundred degrees.”

”Well, do you see the color of the flame? The temperature of this red orange flame is about nine hundred degrees. When the flame turns orange, it means that the temperature of the flame can reach 1100 degrees. ”

”Well, now the temperature of the flame has reached white. At this time, the temperature of the flame is about thirteen hundred. It's almost the temperature I need. ”

After being given a meal by the stone bear, he became interested in smelting. He took the initiative to find the stone bear and said that he wanted to learn how to smelt.

For this requirement of wood planer, stone bear is of course very much wanted. He just wants to cultivate special smelting talents in the tribe. No matter how powerful he is, no matter how much he knows, the specific work needs to be done by hand. Even if you tear yourself down completely, you can't get three or two nails. Therefore, it's very important to cultivate professional talents.

Since the wood planer is willing to make smelting, the stone bear really doesn't mind teaching him what he knows.

The performance of the wood planer also gratified Shi Xiong. When he first took part in the smelting, he raised the question of the relationship between the flame color and the temperature, which was enough to show that this guy was a man of great intention.

So the stone bear told him what he knew about the relationship between flame color and temperature.

Wooden planer is also a cultural man in the tribe. He took a piece of limestone and a stone slab and wrote down some symbols on it that stone bears could not understand

As the color of the flame reaches white, it means that the furnace temperature has reached more than 1300 ℃. And at this temperature, the crucible that looks like a bit of a bluff has withstood the test of high temperature. Even if the crucible is red, it is still not broken.

As for the pig iron pieces put into the crucible, they have begun to melt slowly at this time.

These iron pots exchanged by European colonists were actually gray cast iron. The melting point of this kind of gray cast iron is about 1320 degrees, so when the flame starts to turn white, these pieces of gray cast iron begin to melt

PS: the new week has begun again. Lao Mo is in urgent need of the support of the recommended tickets from readers!