After Zhao Xin briefly explained the principle of quenching, even the blacksmiths did it better than him.

The reason is very simple, the quenching material is not necessarily water, it can also be something else, but sometimes the effect is good, sometimes the effect is not good, after Zhao Xin said the principle of quenching, rapid cooling and slow cooling alternately, releasing stress, and promoting the formation of alloys, after this is understood, they do it faster than Zhao Xin's guidance, and even summarize a series of experiences.

Quenching, in terms of hardness, is not too high for the improvement of steel, just a little bit, but for the improvement of toughness and durability, it is quite obvious.

In the 21st century, in small cities or rural markets, many people sell complete sets of knives, and even cut the wire on the spot to verify the performance of the knife.

Many people believe that they really bought it, and it was really good to use it at the time, but later, they found that it was not so durable, and it was quickly disadvantaged, and there were even some problems such as rust.

In fact, it is the steel mill, obsolete or discarded steel, because if it is directly returned to the furnace, there is some waste, so it is sold, and some unscrupulous businessmen make these knives and flow into these places.

However, in terms of steelmaking, the use of the previous hardness standard is not good, although the cement marking, a grade up, also represents a huge improvement in performance, this is different from steel, the improvement of steel brings more aspects, the entire industrial society, nearly hundreds of different steel marks, so that the world has a variety of differences.

Zhao Xin made an abbreviated version of the hardness data, which is weights and measures, and is the basis of everything, which must be deepened and refined.

The foundation of the experiment lies in the accurate data, how to find the right direction through data analysis, this is the most fundamental place, in ancient times, there was no such experimental system, just by feeling, two swords that are almost the same, can you say which one is better.

Find something that corresponds to the hardness, the hardness can be on the item with small hardness, forming scratches, this is a very intuitive example, and then through a certain tool, make a simple, can be a relatively brief analysis of the hardness of the tool, which can be compared with the experimental results.

It is intended to be used as a criterion for evaluation.

The hardness of all kinds of objects in nature that was taken out before is relative to the whole number, at most 0.5, but in steel, most of them are in the hardness range from 4 to 6, in fact, steel is mainly concentrated in the range from 4.8 to 6.2, and the iron with higher hardness is definitely more useful than the lower hardness.

Now, there is no perfect standard, even the simple price, it can't be measured, fortunately, there are many treasures carried by Sun Ji and Xue Yu and others, and comparing them can produce a more subdivided hardness.

At the beginning, these people were quite reluctant, but when the Zhao credit card system was manifested, it didn't matter, because even if they were lost, they could be manifested through immortal arts.

In fact, these treasures made with the help of this meteorite and some other methods, their hardness is not the same, and they barely determine a few standards, and then take this as a standard for measuring the whole and forge it.

Of course, there is also the card system, the card system has been clearly marked, some of the performance of the item, which is very helpful for experiments, sometimes, the difference of 0.1 or even 0.01 under the premise, can no longer be proved by mutual drawing, only the card system can prove.

In fact, at the time of 50% success, there was already a very good sword, which surpassed the sword in Wang Song's hand.

In addition to the folding hand crossbow, Wang Song is this dagger-like short sword, which comes from the Great Inner Secret Collection, I don't know if it is Taizu or Taizong, which emperor or big family seized it from, it is extremely sharp, and it is hair-blown and broken, but compared with the newly refined short sword, it is an order of magnitude worse in hardness.

In other words, Wang Song's short sword, among all the weapons, is considered to be the highest level, and the final data is 5.8, of course, this is tentative, in Zhao Xin's opinion, this should be less than 5.8.

The hardness of the newly manufactured sword is as high as 5.9, which has reached and exceeded the benchmark of ordinary knives in later generations, and the hardness of knives in later generations is known to be 5.8-6.0, but most of them are only about 5.

5.9, can already be called a magic weapon, he is about 0.5 smaller than him, the difference in hardness is very obvious.

It cannot be said that this hardness difference can cut gold and jade, as far as the hardness of jade is concerned, there are very few knives that can be compared with it, and most of them use sharpness and speed to cut jade.

The 5.9-level steel sword was not left at the least, because it needed to be tested, and this possible divine weapon was cut.

For this reason, Sun Ji was still a little sad, Wang Song's short sword was only as long as an adult's palm, and he didn't mean to make it so long, but there were only so many meteorite materials, and it was also the best kind of meteorite among many meteorites.

Now there is a standard long sword, in all aspects of performance, to surpass this short sword, how enviable.

What Zhao Xin said is also very reasonable, besides, the whole process of the experiment is Zhao Xinlai's responsibility, not to mention a long sword, even if it is a dozen or so common ones are melted and reforged, Sun Ji They can't say anything, but they feel a little pity in their hearts.

In fact, the appearance of such a long sword has greatly promoted the process of the whole experiment, which is the only high-quality product that has been produced for such a long time, and it has increased a certain height based on this, just reaching the level of the final result of number theory, which has greatly accelerated the progress.

Since this time, the success rate has increased from 50% to 80%, which also makes Sun Ji and them even more surprised, there is really such an evil sect.

Today, after a period of hard work, finally, the success rate is controlled at the level of 9 percent, which is the most extreme, unless there are special analytical instruments to analyze the carbon content of these wrought iron and pig iron, but also to the performance indicators, temperature monitoring, etc., there is a more accurate control, so that the success rate can reach 100%.

The Northern Song Dynasty is so simple, and under backward conditions, 9 percent is already the limit, what makes him even more excited is that after getting a long sword with a hardness of 5.9 from that day, there is no one who has reached that hardness, the highest is about 5.6, such a level of weapon, in the Northern Song Dynasty, is still the level of a divine weapon.

Sun Ji and the others saw better weapons, and now they see that these can also be called sharp weapons, and they are always a little unrefreshed.

Sun Ji was disappointed, and even felt that they might not be able to make it, but for Zhao Xin, there are not many problems with these, just a 5.9, not 6.0, or 6.2, and it is just a matter of luck that they can't get it.

At present, there are a total of 40 blacksmiths in Miaojiazhuang, and they have participated in the entire refining process, and Zhao Xin has not kept it secret, and even set up a process for them to ensure that the vast majority of blacksmiths can smoothly refine steel.

In ancient times, the secret recipe was the most important, sometimes, a secret recipe can make a person, a family have a earth-shaking change, sometimes, a recipe, can even let a family to guard the secret.

The general secret recipes are so precious, not to mention these divine weapons, which are of the same grade as famous horses, in this era, it cannot be said that everyone desires, but it is not unsellable, and the price is very high.

Even if they don't produce and sell, even if they take this craft and return to the army, they can sit in the position of master craftsman, which is not a simple promotion.

In the Northern Song Dynasty, the status of craftsmen is not too high, but the master craftsman is different, the master craftsman in various industries, are the same existence as the leader, a master craftsman can support a foundry, is the core of a workshop, they are not officials, but the general officials, will not be a little harsh on them, because they represent the efficiency of the workshop.

For this, Zhao Xin didn't care, a cold weapon production method only, next, after he made a breakthrough in steelmaking, when the industry produced a quantitative advantage, these magic weapons, almost inevitably withdrew from the stage of weapons, at best, some expensive handicrafts, lost the use value of weapons.

Sure enough, after waiting for a short period of time, today, among the 40 swords refined by the blacksmiths, 5 of them have broken through, and 5 have reached 5. The hardness of 9 is the degree of the strongest divine weapon.

5 handfuls, one handful is enough to make them excited, or 5 handfuls, it just so happens that even Xue Yu is back, the four of them, plus Wang Song, exactly five people.

Wang Song also liked these weapons very much, but after reading the standard of the weapon, he took the initiative to give up, because this weapon was too long.

On the battle array, the long sword and long knife are the key, they can be used on the battle array, one inch long and one inch strong, but Wang Song is not a soldier, he is just a eunuch, although there is a certain amount of force, he can protect Zhao Xin closely, the maximum that can withstand is a sword that is no more than 2 feet, and if it is longer, it must be a soft sword, otherwise it is not easy to carry.

However, these swords are at least 4.5 feet, and the longest is even six feet.

For a strong man like Sun Ji, such a scale is just right, they are all tall and big, even if it is inconvenient to wear, it is good to carry it.

After discussion, they chose four out of five, and they almost chose their favorite weapons, and they were about to take them, but they were blocked by Zhao Xin, because this sword did not go through the last process, sharpening the knife, and there was no sharpening of the blade of the sword, at most it was called a sword-like iron rod, and it could not be called a sword.