As a result, when the furnace was first opened, both small blast furnaces were burned down.

Fang Chang saved several bellows, stood in front of the ruins, carefully checked and summarized.

Then he combined some ideas during the construction process and got a lot of details that needed improvement.

For example, the support structure needs to be changed, the appearance needs to be adjusted, and even the stacking method of fuel, ore and auxiliary materials needs to be adjusted, the furnace bottom heat insulation needs to be improved, the outer reinforcement hoop needs to be added, the flue preheating needs to be extended, and the air inlet angle must be corrected...

In short, it was only after refining the silk that Fang Chang successfully refined the first furnace of pig iron.

By this time, he had built eight furnaces.

There were various situations in the middle, such as blockage of iron, tumors and materials in the furnace, slags and no iron is produced, furnace body swelling and cracking, iron juice explodes when it encounters water, etc. There were even two of them, if Fang Chang was a mortal, he was already scattered.

Fortunately, all the materials were collected from Yunzhongshan, and they were made by Fang Chang himself. It was not a pity for demolition and construction, and it was not expensive and food. There was no feeling of cost.

The red hot molten iron flows out from the open outlet and flows along the preset grooves.

Then, the iron flows into the groove, gradually becoming dim from red and dark, and finally reveals the color of metal.

Fang Chang still did not stop blowing. He kept moving his hands and pulled two bellows because the blast furnace needed to maintain temperature and wait until the contents were empty before it could be stopped. The coke and iron ore stocks here, and even the tanks used to solidify iron ingots outside, did not support continuous smelting.

It was already night, and the sparks spewed out of the blast furnace and the bright red iron flowing in the grooves on the ground illuminated the surroundings.

When nothing flows out of the furnace, the square still maintains ventilation for half an hour.

Then he stopped the bellows and walked over to check his achievements.

The iron ingots that were first released were still not completely cooled, but he was not afraid of the high temperature. He reached out and picked out the iron ingots in the first groove and picked them up and looked at them.

Then he tapped his fingers, and the sound was crisp and short.

"Yes, it's finally done." Fang Chang said with a smile.

However, what comes out here is pig iron. Pig iron is crisp and hard, suitable for making some rough things, and is only suitable for casting. If you want to make fine objects, you should use other means to make steel, or cook iron and make things for surface carburization.

Although cast iron is not durable except for making a hammer, it can be used to cast a pot.

Pig iron pots can only be made by pouring and making them because they are not tough and brittle, and they are easy to break, so they can only use the method of increasing the thickness to maintain strength. This kind of pot is also very heavy.

However, it also has its own advantages. Although it is not easy to rust when it is operated well with oil, due to material problems, the temperature in the pot will not be too high. It is very suitable for stewing and stir-frying, and it is not easy to stick to the pan and paste the bottom.

On the contrary, due to the good material ductility, cooked iron pots are often forged and made. They can be made very thin, with fast heat conduction and quick heating. Although the temperature is not easy to control, they are very suitable for stir-frying. Moreover, cooked iron itself is less prone to rust and is resistant to bumps.

Fang Chang now only has pig iron ingots, so he planned to pour an iron pot first and replace the bronze tripod and bronze plate he currently uses.

He put this matter first.

The progress of the silk reeling was stopped, and the continued iron smelting and steel smelting were stopped. Even because of the interest, Fang Chang gave up sleeping and eating. After all, for practitioners, whether it is sleeping or eating, it is actually not a necessity.

However, before starting the work, he built a square table with stones more than ten feet away from the front of the Wuming Hall, placed the tripod he had used to cook before, and made a sculpture.

If a mortal can see the changes before and after, he will feel that the style on Xianqi Cliff has improved a little in an instant.

He first built a one-person-high furnace, smashed the iron ingots that had been refined, and placed them layer by layer with coke, and then raised the fire and blasted the air. After the pig iron inside melted into molten iron, it flowed through the outlet beside the furnace and flowed into a square iron pool through a small platform.

Use a bronze spoon to quickly scoop up the iron from the pool, pour it into two iron pot molds of different sizes that he made in advance, cover the upper cover, and then put it next to it and cool it down.

It is not difficult to cast an iron pot. I used to cast many copper ware in Fangchang, but now I have only made some upgrades based on my previous experience. There is no problem with molding the iron pot in the mold. Just wait for it to cool down and open the mold and take out the iron pot to polish it brightly.

Next, he did not stop.

Because there are not many pig iron ingots in the furnace, he has almost put half of the iron ingots refined from the blast furnace ore, so now there are not many red and bright iron in the iron pool.

Fang Chang was not planning to cast anything else. Xianqi Cliff was his own temple and he didn't need any copper bells and iron drums. He had more interesting uses for these iron.

Steel frying is a relatively simple steelmaking method with appropriate ingredients control and high productivity. As long as it is operated properly, the quality will not be low.

He had already prepared the relevant tools, and now the iron pot has been cast. Just when it cools down, he began to continue the steelmaking operation.

Compared to casting with melted pig iron, the additional tools required for stir-frying steel are very simple:

A willow trunk.

Originally, when stir-frying steel in the mortal world, he often used willow sticks, but Fangchang was very strong. He simply pulled out a willow tree from the forest, removed its roots and branches, leaving only the main part, and removed the bark, making it a thick and smooth willow trunk.

A bellows grew in the back, and a willow trunk was held in the other hand, stirring constantly in the molten iron.

During the stir-frying process, because the carbon component and air contact area increase, combustion will occur and the furnace temperature will be increased. Using willow wood to stir, the carbon content inside will also be maintained at a suitable level.

Of course, Fang Chang still explored for a while before he found the right method with the extraordinary qualities of a practitioner.

Generally speaking, the method of frying steel is much more efficient than forging pig iron blocks.

Its finished product is often cooked iron or low-carbon steel, and it is very lucky. He fryed this furnace and solidified. After he looked at it, he confirmed that it was a cylinder.

The product is made into slender strips by square length, which is more suitable for smelting and forging and making into various required devices.

However, Fang Chang first used the last bit of molten steel to make a hammer.

Well, if you put a wooden handle on this steel hammer head, you will use it to temper these steel bars. I wonder if it is considered "boiled beans and burned bean pods".
Chapter completed!