Chapter 887： New saber

Marin first thought of carbon spring steel. After all, Beihai already has the ability to smelt the most basic carbon spring steel and can also make springs.

But in the end, Marin gave up, why? Because the output of carbon spring steel is low ...

Said it is carbon spring steel, but it is still doped with a lot of manganese. In order to manufacture spring steel, Marin said that he must not import a lot of pyrolusite (manganese dioxide) from the Venetians. The production of soft manganese ore is low and the reserves in Europe are also low. Therefore, all the spring steel made of manganese ore is used as a spring. I want to make knives ... it's no problem to make a few pieces, but if you want to install the army, don't even think about ...

You know, in Marin's plan, there should be tens of thousands of cavalry in the Beihai Kingdom. With so many sabers used by cavalry, the amount of spring steel needed ... Anyway, Marin felt unlikely ...

Therefore, Marin can only find a way on ordinary steel. Then, it is the sword forging technology ...

In the current world, when it comes to knives, Japanese Japanese knives are definitely among the best. Only Damascus knives using Uz steel from India can be compared.

However, Uz steel is a natural pattern steel because the quality of the ore is good. By the 17th century, because the iron ore for smelting Uz steel had been mined, the Damascus knife was lost. It was not until modern times that new technology was used to create pattern steel, and production of Damascus knives was resumed. However, the ancient pattern steel pattern is naturally generated, not carved, and many modern so-called treasure swords, the pattern on it is actually made by hand.

In addition to India's Uz steel is a natural pattern steel, China and Japan, there is another way to get artificial pattern steel. This is the over-forging method, which is how hard iron wraps soft iron to make an artificial pattern steel treasure knife. The so-called pattern is actually the trace formed by the forging of the hard steel on the surface and the soft steel of the sword body.

However, the patterned steel sword created in this way is extremely complicated and takes a long time. It is said that in Japan, it takes 15 people to build a top Japanese sword for half a year. Even if multiple Japanese knives can be processed at the same time, the energy of each knifemaker can only create 12 Japanese knives and 20 Japanese knives each year. Moreover, ordinary swordsmen can't create top Japanese swords, and they need senior craftsmen. Therefore, the cost of Japanese swords is high. In later generations, a hand-made Japanese sword cost tens of thousands of dollars.

Of course, that's the top katana. When doing business with the Ming Dynasty, Japan was not so honest and would use such expensive knives to trade. Japan itself lacks iron ore, so they all smuggled Fujian Iron from Hu Jian to Japan and processed it to create Japanese swords. Many low-level Japanese swords are actually low-end versions of Mintie's simplified Japanese swords. If the high-end version of the Japanese knife is used for trading, it is not worthwhile.

How to get the low version of Japanese sword? It is the Fujian iron smuggled by Hu Jian, which allows ordinary blacksmiths or blacksmith apprentices to work hard to remove impurities in the iron and make it into refined iron. Then, put the red iron block on the stove and continue to heat it, then cover it with charcoal and simmer it, carburizing the surface of the blade. In this way, you get a low-cost version of the cheap Japanese sword.

Hu Jian ’s Fujian Iron is itself smelted with charcoal, and it certainly contains less sulfur than iron smelted from coal in the north. After repeated forging by Japanese low-end blacksmiths, the quality of the refined iron obtained is definitely better than the knife made by northern iron. Then use charcoal for surface carburization. The Japanese knife that was finally obtained was definitely better than the knife made of northern pig iron with high sulfur content.

Then, I got a lower version of the Japanese sword that is stronger than the Daming sword. However, this Japanese sword is very economical, and most of Japan's lower and middle-level samurai are using this low-profile Japanese sword. If you use top-level Japanese swords, most of Japan's lower-middle-level samurai can't afford it, let alone armies. In addition, the patterns on this low-profile version of the Japanese knife are mostly carved manually ...

In World War II, the knife used by the Japanese commander He Cavalry was not a traditional samurai sword, but a prop made using modern steel technology. In fact, the material used in the Japanese 32-cavalry knife (the 65-cavalry knife is modeled after this knife) is high-carbon steel. Therefore, although the Japanese sword during World War II was famous, its quality was far less than the ancient Japanese sword. It's only rare that Tubalu people still use iron blades. Moreover, seizing the command knife means defeating the Japanese officers, which is an honor. As far as the knife itself is concerned, Japanese command knives during World War II were sprayed as "iron rods" by professionals ...

The pattern steel that Marin knows is the 45th forged and 60 manganese steel. Among them, 45 steel is the sword body, and 60 manganese is wrapped outside ...

And what is steel 45? Looking at its label, it is obviously medium carbon steel! It seems that the 56 and a half barrels of later generations are also made of 45 carbon steel ...

Therefore, Marin decided to change the steel used in the blade body to medium carbon steel. Although medium carbon steel is not as tough as low carbon steel and harder than high carbon steel, its performance is compromised. Moreover, Marin has a way to solve the problem of surface hardness-surface carburization ...

The medium carbon steel is the blade body, and the toughness is better than the high carbon steel. In case of strong impact, it will absorb the impact force through bending deformation, and then restore the original shape. But if the surface is also medium carbon steel, it is easy to be cut by the enemy's knife.

If the forging method is used, the surface is wrapped with high hardness steel, and the natural performance is higher. However, as a result, the cost is very high. Moreover, not every blacksmith has the technique of stacking. The master craftsmen who can build the sword by the forging method. Moreover, forging is very time-consuming.

However, it is obviously not possible to build a saber for cavalry. Not to mention the high cost, the building speed is also very slow. Therefore, Marin decided to adopt a compromise solution-carburizing the surface of medium carbon steel. In addition, in quenching, it also uses advanced quenching methods that meet the tool, rather than simple water quenching.

As for how to carry out surface carburization? The charcoal stew in Japan is undesirable. Because of the carburizing method, the carburizing distribution is uneven and the scrap rate is high. When creating Japanese swords, you need to re-screen to get qualified parts and eliminate unqualified parts.

...

However, as a graduate of the history department, Marin had seen a carburization method in the Ming Dynasty science and technology book "Tiangong Kaiwu", which can solve the problem of uneven surface carburization well. Moreover, this method is said to have applications until now.

This method is-put the shaped iron into the crucible, and then cover it with the charcoal, fermented soybeans and the end of the earth ~ www.novelhall.com ~ heat outside the crucible ...

Charcoal and tempeh are both carburizing agents, providing carbon for carburizing. The end of the soil is a dispersant, which makes the carburization uniform and avoids the uneven carburization of the charcoal simmering.

This carburizing method makes the carburized iron carburized evenly and stable, and the carbon potential is very high (Marin himself does not understand what the carbon potential is, anyway, it is good for carburizing).

The medium carbon steel has good strength, and after this excellent carburizing technology, the blade strength must not be bad ...

It is said that during the Spring and Autumn Period, famous masters of Wu Guo like to put hair and nails as carburizing agents when casting swords. As a result, a poster version of the posterity was published, saying that the master Moxie and his wife sacrificed their swords in order to create the sword ... In fact, the master just used hair and human nails as a carburizing agent to carburize the sword surface ... It is estimated that the legendary blood sacrifice sword is also used as carburizing agent. After all, blood is organic and carbon-containing ...

...

Finally, it is the quenching process. Marin had read some historical novels in his last life, and knew that there was a clever way of quenching swords in ancient times, that is, "bath to drown five animals, to quench five animals fat" The sword thus obtained is very wear-resistant and elastic. And what is the "drowning of five animals"? It's actually the urine of animals. As for the "five animal fats", it is naturally the fat of animals ... There is a legend in ancient times that horse urine is used to harden weapons.

Explained by its practical modern scientific viewpoint, quenching with the "drowning of five animals" is actually salt quenching. Quenching with "five fats" is actually oil quenching. The combination of salt quenching and oil quenching is a two-liquid quenching, which is a clever sword quenching method. The quality of the swords obtained by this quenching method is a drop ...

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