The old warrior happily walked away with his sword in his arms, leaving his troubles to the ill-intentioned demon king.

There are four ways to make steel.

The first, and the first invention, was the use of wrought iron mixed with slag fired in a simple furnace and repeatedly heated and forged for carburizing, which was also a common technique used by blacksmiths in this era.

The advantage of this forging carburizing method is that it is simple and easy to operate, and it can be operated by one or two people, but the disadvantage is that it is extremely dependent on the quality of the raw material.

The steel sword of the Roman era had a hardness of 4 or 500 HV, while a steel sword in the 11th century had a hardness of just over 200 HV.

What is the concept of 200HV?

A high-quality bronze sword from the Warring States period with a hardness of 300HV.

However, this does not mean that Rome's steel-smelting skills were particularly advanced, because according to the Romans' own records, good steel was imported from the East, India and China, and was an extremely expensive luxury.

For a long time in the Middle Ages, the sea was in the hands of the pagans in the south, the trade routes were cut off, and many Roman seaports were degenerated into agricultural villages in the interior.

The second method of manufacturing steel is the annealing and decarburization of blast furnace cast iron - the difference between wrought iron, pig iron and steel is that there is more carbon and less carbon, wrought iron carbon is less, pig iron carbon is more, and steel is in the middle, so wrought iron needs to be processed into steel, carburizing is required, and pig iron is processed into steel, and it is necessary to decarburize in turn - the pig iron smelted in the blast furnace is annealed in the annealing kiln for 3~5 days, and annealed in a suitable manner

environment, it is possible to obtain annealed decarburized cast steel.

The third way to make steel is the famous frying method.

Frying steel method, in the reeling furnace, high temperature frying pig iron raw materials, first heat the iron into a semi-molten state, and then continue to blow and stir to make the carbon in the iron oxidation and decarburization, good control, can quickly get batches of steel, poor control, out of the furnace is wrought iron.

The fourth is the steel filling method...... After the Common Era, there was no technique in the dream.

The fifth, the crucible method, puts wrought iron and charcoal together in a crucible and is forced to heat it in an open furnace for 4 hours, which is how India's famous Uzi steel is smelted, which requires high-quality iron ore.

After Luo Yi thought about it again, he built a reined furnace next to the blast furnace (shaft furnace).

Her plan is that although the performance of ductile iron is good, it is not easy to refine, and it seems that rare earths are still needed - where to get this? White-hearted and black-hearted cast iron is good for farming tools, it seems inappropriate to make weapons, blast furnace ironmaking costs too much, buying iron farming tools in these years is tantamount to going crazy, looking at the appearance of the blacksmith and the people around him, it is estimated that there will be no second madman within a radius of 100 miles.

She had to find a high value-added – that is, low-cost, high-price and marketable – product to subsidize.

She came up with the idea of making steel weapons.

Arms is said to be a lucrative business like drug trafficking.

Moreover, these soldiers have status, and weapons should not be sold.

The most convenient method of steelmaking is carburizing forging, but blacksmiths will do it.

The annealing and decarburization method is good, but the heat is difficult to master.

It is still a steel frying method insurance, and you can get a relatively uniform wrought iron without making steel, and on this basis, carburizing and forging, she believes that it must be better than that made by this subway craftsman, at least there is much less slag in it.

Then, the manufactured steel knife is partially quenched.

Quenching can increase the hardness, the Romans knew that the way quenching, but they will not be local quenching, after quenching, the hardness of steel increases, and the brittleness also increases, the longer the utensils are quenched, the easier it is to break, so from Rome to the Middle Ages, they only use quenching techniques on knives, chisels and other utensils.

The local quenching can achieve the effect of rigidity and softness, the top steel sword unearthed in the Western Han Dynasty, the internal hardness is 200HV, the hardness of the blade is 1000HV, the internal softness and the external rigidity, both toughness and hardness, is thanks to the local quenching technology.

The Demon King made three steel swords and prepared to sell them for a high price.

If you don't sell it at a high price, you can't do it.

The others that came out of the furnace were not ** because of experience......

This time, the raw materials were shipped by a merchant, and although the raw materials did not cost money, the freight was still a lot.

Then she found out that the result of selling at a high price was likely to be a loss of head.

In order to make the hostess understand, John also made a terrible gesture near his neck.

That crisp gesture made Luo Yi sigh and press the remaining two to the bottom of the box......

It is certainly a tragedy to be a cannon fodder heroine, but it is even more unhappy to be the one who is killed and robbed.

So, the Great Demon King's efforts to think about the medieval arms dealers failed.

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