471 high manganese steel
Harmonys said that Li You still agrees with and is satisfied. If three thousand female slaves are added, another five or six thousand people will be available. Don't ask these people to fight, just keep the place well guarded and don't let the inside. The problem is enough, this is not a particularly high requirement.
After returning to the city, Li You went to Tanzburg. He asked for more than 20 skilled blacksmiths and dozens of craftsmen who could cook pottery. He also said that he must find someone he trusts. People, this makes Tanzberg a little bit embarrassed. After all, the most credible people are people from the Ute Department, but few of these people can make pottery.
"General Tanzberg, it doesn't matter what pottery is, the key lies in the blacksmith. I will teach them some techniques, and these techniques can't be easily leaked out. Once leaked, it will be a lot of trouble."
"Most protectors, then there is no problem. There are many blacksmiths in my Ute department, but I can find dozens of them."
"Well, I will want these people tomorrow."
In addition to these people, Li You also selected some people from the people who had been transferred in Zhuhai Park, so as to teach them how to prepare gunpowder and extract Glauber's salt. Of course, this is a later matter. The graphite crucible is fired out from the workshop. Nowadays, the crucibles used in ironmaking in many places are still ceramic crucibles, which can not meet the demand. Of course, there are also graphite crucibles, and there are people in Broken Leaf City. The graphite crucible was used, and this time Li You also brought a lot of raw materials from the broken leaves.
Coking requires a metal coke oven to isolate the air, and then heat it to a thousand degrees Celsius for high-temperature dry distillation. Everything can be simplified here. Anyway, as long as you can get coke, as for the by-products of coking, don’t even think about it. Asphalt can stay outside, but nothing can be retained.
The workshop was designed by Li You. Just follow the drawings and construct it. It is nothing more than the coke oven that needs refractory bricks. The furnace cannot be built too small, and the airtightness cannot be too bad. Challenge. Like iron chains, winches, and pulleys, Li You needs to be prepared.
There is no water here, and I deliberately dug a well on the side. Anyway, time can't be delayed, and we can't wait until all the workshops are built to do these things slowly. The coking workshop is at the downstream position of all the workshops, and the distance is slightly extended. After all, this is a somewhat dangerous workshop. A large amount of combustible gas is produced during coking. If it is not handled properly, it is no less powerful than a bomb.
Within a few days, both the refractory bricks and graphite crucibles were burned out. The materials for the refractory bricks were prepared by Li You when he was in Beijing. Not much, just four carts of green paste mud. These are enough for use, coking refractory bricks. It is made of clay and green paste mud, so that as many refractory bricks used in coking can be burnt as much as possible. After all, the temperature during coking is not so high, and only bricks made with green paste mud are used for refining. Li You did not plan to build a large steelmaking furnace for the steel.
When Li You was ready here, he waited for Zhang Da to transport coal, and it would be almost two days. As long as the coal he brought arrived, work could start here. Once there was coke, there was nothing left. It’s really not easy to go down step by step.
Three days later, Zhang Da finally arrived. This time, he brought over 20 carts of coal. Now, Li You can finally try to start. There is only one coking workshop with two coke ovens, which is not too big. It can only be loaded with ten carts of coal at a time. There is no other way. The materials are limited, unless you can find refractory bricks here. New Bayi Chinese Network first launches New 81 Chinese Network, the fastest computer terminal: https://
Washing the coal into the furnace first, and then burning the coal with coal. This is the first time everyone has seen it, and this time is not short. Li You said that it will take several days, and the burning of coal cannot be stopped, and the tuyere needs people to go to the furnace from time to time. In the past few days, Li You really lived here. He had to teach others how to do it, and he couldn't be sloppy in coking.
Eight days later, when the first batch of coke was released and quenched with water, it shocked others. It was completely surrounded by water vapor. When Li You saw the silver-gray coke with metallic luster, he was finally relieved. Now I can try to make a furnace of molten steel with a small crucible.
The burning furnace was prepared by Li You a long time ago. It uses refractory bricks, and the lower layer is open for air injection. If you want to burn more than a hundred kilograms of iron into water, one furnace of charcoal fire is enough, as coke. When it burned to produce a blue-violet flame, the surrounding blacksmiths knew one thing, that the temperature had indeed exceeded that of coal.
The pyrolusite Li You has been refined. In the crucible, he put a certain proportion of pyrolusite powder, and added some lime and iron ore powder. As long as the iron in the crucible melts, it should be able to get steel. After all, a higher furnace temperature and the addition of manganese ore can more effectively remove impurities in steel. This is originally cast iron cake, and the carbon content is not particularly high. After adding iron ore powder, the carbon content can be further reduced.
Some of these blacksmiths still know that adding limestone can remove slag, but they don't know the principle. After limestone is added, it can be used as a slagging agent to remove silicon dioxide and sulfur in the molten iron to form slag floating on the molten iron.
When the pyrolus ore powder is added, the sulfur in the molten steel can easily form manganese sulfide with a high melting point with manganese and be transferred to the slag, thereby reducing the sulfur content in the steel again, thereby improving the forgeability and rollability of the steel, and at the same time It can also improve the strength and hardenability, hardness and wear resistance of steel. As long as one to two percent of manganese is added to low-alloy steel, the strength of steel can be increased by 20 to 30 percent compared to ordinary carbon steel.
Li You didn’t know how much manganese the pyrolusite he added was ore. Although he knew that the pyrolusite content was generally 50 to 70%, it was not accurate. At 2.5 to 3.5 percent manganese, the low-manganese steel produced is almost as brittle as glass, and it breaks when it is struck. This is not what Li You wants to see, so the amount he added this time is very high, no matter how it is calculated, it will exceed 13%. This is the safest way.
Because manganese steel has very strange characteristics, when more than 13% of manganese is added, high manganese steel will become hard and full of toughness. This is the best for casting gears, steel mills and ball bearings. Good material, what he has to do now is to cast gears, so he must add so much pyrolusite.
When the blacksmith removed the scum on the molten steel, they began to prepare for casting. The sand mold was ready, and they were waiting for this pot of molten steel. The molten steel in this pot has three sets of bite gears, which are prepared for hydraulic machinery. Only with such materials can the strength be increased and wear reduced.
Next, Li You let people start the firing of a new furnace of molten steel. This time Li You was going to do steel ingots. He poured more than 30 pieces and asked the craftsmen to try to make horizontal knives and touch the high manganese. The characteristics of steel. When high-manganese steel is heated to a light orange color, it will become very soft and very easy to perform various processing and shaping. This is what Li You wants them to know. (End of this chapter)