The quenching method used by Nguyen Da today is a very advanced quenching technology.

Two-liquid quenching.

It was also Liu Ming who told him when he was drunk.

When Liu Ming first said it, he even thought that Liu Ming had drunk stupidly.

Not to mention a young blacksmith like him, even an old blacksmith has never heard of quenching with oil.

But after trying a knife himself, he found that this kind of quenching effect was indeed much higher than the cold water quenching in his cognition.

However, if Liu Ming was really allowed to operate it himself, let alone quenching, he might not even be able to build a forging furnace well.

He knew so much because he had watched the forging video of Tang Hengdao.

He just dictated everything he saw in the video.

If you really want to be more true, it's basically the same as 'first this, then this, then this, and finally it is done.'" ’

Ruan Da can understand, and he can still grope for a set of tricks on his own, purely because he is gifted and has a high understanding of sword forging skills.

If you change someone and really try to find it, you will only scold Liu Ming for being stupid.

In the two-liquid quenching method, the core is the brine for the first quenching.

The fiery red blade is soaked in salt water, and the clay covering the blade will reduce the cooling time of the blade.

However, the cooling of the cutting edge is extremely fast.

But this step has just begun.

Because of the principle of thermal expansion and cold contraction, the knife will naturally fall off from the blade after cooling down.

After that, it's time of all the time.

Heat.

In this era, there were no temperature measuring instruments, and it was all up to Ruan Da's own experience to control the heat.

He needed to transfer the blade to the melted lard at an exact temperature point.

In borrowing the principle that the oil has a worse heat dissipation ability, the cooling speed of the blade is slowed down.

In this way, high hardness can be obtained during the first brine quenching, and the possibility of cracking or deformation of the blade can be greatly reduced during the second lard quenching.

At this time, Ruan Da, the beads of sweat of Dou Da had already poured out of his head.

It's a matter of success or failure!

He let out a sigh of relief, pulled out the blade, and immediately threw it into the lard bucket next to him.

Suddenly, the exposed hilt of the knife burst into flames!

Ruan Da looked nervous, watching the flames gradually extinguish before pulling out the blade......

On the third day, three quarters.

Liang Shouxin and Ruan Da both came to the table.

Both of them wrapped their forged knives in red cloth and held them tightly in their arms.

Just after noon, Cao Chilian appeared at the table on time.

"Please two bright knives!"

Under the auspices of Cao Chilian, Liang Shouxin took the lead in snorting coldly, slapped his knife on the table, and ripped off the red cloth: "Nine-ring knife!" ”

I saw that the blade of his knife was about a palm wide, slightly curved, the edge of the blade flashed with coldness, the back of the knife was about half a finger thick, and there were nine red gold rings buckled on it, which looked incomparably powerful!

Cao Chilian just glanced at it, then nodded slightly, then held the handle of the knife, lifted the knife upside down, and said, "Four catties, four taels and six dollars!" Loss of material is five taels or four dollars, good knife! ”

Ruan Da was not to be outdone, and slammed the knife on the table in Liang's trustworthy manner, and tore off the red cloth.

Seeing this knife, Cao Chilian was stunned.

The knife was about two fingers wide, and the blade was pitch black, but the edge of the blade shone with a cold white glow.

In particular, the pattern of its blade edge is connected in semicircles, like fish scales.

"This knife ......"

Cao Chilian swallowed a mouthful of saliva and said, "The old man has never seen this knife in his life, and I ask Master Ruan to tell him his name." ”

Ruan Da snorted a little and looked back at Liu Ming.

Liu Ming was also stunned.

He never expected that he drank too much three days ago, bragged after drinking, and told Ruan Da the content of the Tang Hengdao forging video.

Unexpectedly, he actually reproduced it!

It's exactly the same as Tang Hengdao in the video!

He muttered and said softly, "Tang Hengdao...... It was actually made......"

Hearing him say this, Ruan Da immediately raised his knife excitedly and pointed to the sky, "Did you hear that?" The name of my shopkeeper, this knife is called, Tang Hengdao! ”

"I see, Tang Hengdao, it's really a long insight."

Cao Chilian smiled and stretched out his hand to Ruan Da: "Master Ruan, please give me a knife." ”

After taking Tang Hengdao, Cao Chilian lightly shook it, was stunned for a moment, and shook it again in disbelief, and then exclaimed: "Someone!" Above! ”

Liu Ming made a look, and the nursing home immediately went to the restaurant and took out the silver scale.

After the knife was weighed, the scales were adjusted back and forth a little, and finally the two ends were flat.

Cao Chilian read in surprise: "The sword body is heavy...... Three catties and three taels, two taels of material loss! ”

As soon as these words came out, there was an exclamation in the group of blacksmiths.

"How is that possible? Only two or two materials? ”

"Did he cheat, and added material after forging?"

"Have you been beating the dog in the stomach for so many years? After forging, you can add material to show me? ”

The blacksmiths talked a lot, but Liang Shouxin had a cold face.

It is well known to those who forge knives that after swinging the hammer and setting the shape, it is heated a second time, and the irregular edges need to be removed with a chisel knife.

The part that is rejected is the loss.

An excellent blacksmith can control the material loss to one percent.

For example, his knife is more than 10% of the material.

However, Ruan Da's Tang horizontal knife was not even a single percent of the material!

It fully shows that Ruan Da's hammer-wielding skills are much higher than him!

Obviously, forging this chip, he lost.

In fact, it is not that Ruan Da's skills are better than his, but that Ruan Da's techniques are more advanced.

He uses an integrated forging method, not to mention that he doesn't have a hydraulic press, even if he has the help of a hydraulic press, the material loss is indispensable.

Ruan Da used wrought iron to wrap pig iron, and the pig iron in the center was already shaped, and it was enough to beat it next to the shape.

One of the simplest truths, the whole pouring of the knife ridge mold, pouring it into the finished thing, how much material can be lost?

After the spine is done, the blade is knocked around the spine and the matter is finished, how much material can be lost?

This is the method of blacksmiths in Wuyang County to cast sabers, Master Ruan inherited in Wuyang, and Liang Shouxin stayed in Blacksmith Street for a lifetime.

He doesn't know how to do this, and it's normal.

"Ahem...... Ahem......"

Cao Chilian's coughing made everyone quiet.

It can be seen that he is already a little depressed.

After all, Ruan Da is a sinner who betrayed Blacksmith Street, and although Cao Chilian has retired, he is still a person from Blacksmith Street.

Of course, he hoped that Liang Shouxin would win.

However, although Liang Shouxin won the search for materials, he did lose in the forging link.

He has been fair all his life, but he can't step his bottom line to favor Liang Shouxin.

I had to change the topic and said, "Let's try the knife." ”

Finally, the knife trial session came.

The dried bamboo knots, which had been prepared for a long time, were hung in the air by the blacksmiths with ropes.

On both sides are three in a bundle.

Seeing this posture, Liu Ming secretly said that it was not good.

The bamboo hangs in the air, there is no place to borrow power, and the bamboo cannot be cut down with a knife?

In this link, where is the quality of the knife, and the knife is obviously the knife!

The blacksmith only knows how to forge and knows how to swordsman.

Then there is only one way to win or lose.

The greater the mass, the greater the acceleration and the stronger the impact force.

At this time, the weight of the knife has become the key point that determines the victory or defeat.