"Chief Zhao, have the data of those guns been counted? In addition, which unit produced it? Has there been a detailed survey of the production?" After several hours, Liu Yijiu felt that some things should be investigated here. n∈,

There was no way to find out the Western Front. They were all guns produced in the late 1960s and had never been used. This time they were pulled out of the military warehouse.

Liu Yijiu was surprised to find that many cannons did not even have numbers on them!

If the situation on the Eastern Front is the same, it will not be possible to investigate this at all. Even if it is found, no one will admit it.

Not many people will admit this responsibility, and in the end, the person responsible will definitely be shot.

"According to the factory number and our registration, all of this batch of mortars were manufactured by the 2983 factory in Guixi..." Liu Yijiu had not expected that the production unit had been found out here.

"Is the muzzle very serious deformed?" Liu Yijiu was surprised and asked.

"Yes, according to our technicians' analysis of this accident, it should be a quality problem that arises during the production process. Some of the guns were produced in the past and pulled out directly from the warehouse, and some of them were produced in recent months. Which of the blow-off door was the latest one that was transported to the front line. The officers and soldiers of the troops have been reporting that many guns had to stop and cool the barrel after firing a few shots. The ones produced in those years did have quality problems, so we put the latest guns into use. Who would have thought..." Zhao Bingyi said helplessly.

Liu Yijiu nodded and signaled that he had already known.

And he recorded the name of the unit of Factory 2983 in his small notebook.

This is very important. If there are problems during the use of military equipment, they must be held accountable according to the production batch number. Therefore, technical information during the production process must be kept in the archives room. These technical information include drawings, process regulations, quality inspection tracking cards, inspection records, etc.

Depending on the use of the equipment, all technical information must be preserved if the equipment is not scrapped.

Liu Yijiu still asked Zhao Bingyi to take him to see the cannons first.

What Liu Yijiu didn't expect was that Zhao Bingyi brought him to see dozens of mortars of various caliber were placed on a small open space not far from the 123rd Division Command.

"The soldiers of the mortar company would rather ask for grenades than use these guns again..." Zhao Bingyi was very sad.

Once upon a time, these things were the favorite things of their troops' soldiers.

Liu Yijiu did not speak, but instead yawned Luo Tong, who was illuminating the flashlight of the soldiers sent by Zhao Bingyi, began to measure the caliber of these guns. What they can do now is this. Only in the arsenal or research institutions have hardness detection equipment and physical and chemical analysis equipment.

Only then can we know what is the cause.

The data obtained is roughly the same as the batch of mortars on the Western Front battlefield. Liu Yijiu has basically confirmed that the cannons on the Western Front should also come from Factory 2983, even if not, at least the same batch of materials.

"Master, the underside of the cannon barrel is bulging..." After Liu Yijiu measured all the cannons, Luo Tong, who had just stood up and was squatting on the ground and following him to record data, cried out.

It is not necessary to look at it with the naked eye. The surface of the barrel has been processed and has surface treatment processes, so it feels very smooth. If there is a bulge, people with slightly better feel can find it. Only experienced masters can feel it.

Liu Yijiu quickly asked him to take the cannon barrel over.

When you touch one section from one end with your hands, your face becomes even more ugly.

"This is not a bulge. It is too severe deformation..." This situation should be caused without heat treatment.

The steel used to make gun barrels and barrels originally require very high hardness, and they are all produced special gun steel to make gun barrels. In order to improve the cutting performance of gun barrels and make processing easy, the hardness will be reduced by heat treatment before processing. At the same time, the tissue uniformity of gun barrel materials will be improved. After rough processing, the tempering heat treatment will be carried out, then semi-finished, then quenched, and then tempered after high temperature...

The gun barrel produced in this way has high hardness and good toughness.

Especially for some special gun steels, after such process, the gun barrel has very high high temperature strength and ablation resistance.

Only with good high temperature strength can the barrel be deformed due to the instantaneous high temperature and high pressure and friction when the cannon is out of the bore.

"Director Zhao, please arrange for someone to see these gun barrels open and ask someone to help me get a magnifying glass with the maximum multiple here... If nothing unexpected happens, I think I have found the cause of the problem." Liu Yijiu's face was really ugly.

Those bastards who gave birth dared to do such a thing!

"What's the problem?" Zhao Bingyi did not expect that the young man sent by the Ministry of Machinery could easily find out the reason.

Isn't this a joke?

"Now I'm just guessing. After you saw this open, you can only confirm after watching the metallographic organization of the gun barrel!" Liu Yijiu said, holding back the anger in his heart.

Zhao Bingyi didn't say anything, but asked someone to go to the maintenance office to find the technician from the maintenance office to bring the things that Liu Yijiu wanted.

"What? Saw the barrel open? Director Zhao, aren't you kidding? The hardness of this barrel is comparable to our saw blades. It can't be sawed at all. Once you saw it, the saw teeth will have to be smoothed..." When the master from the logistics and maintenance department of the 123rd Division came here, he immediately became angry.

"If you ask you to see it open, just saw it open. Don't talk so much nonsense!" Zhao Bingyi now vaguely guessed why.

He was in charge of the logistics supply of the entire Eastern Front and still had some understanding of the most important cannon production process.

Only if the gun steel that has not been quenched or the quenching hardness is insufficient, it is possible to cut it off with an ordinary saw blade!

The director who initially raised objections was angry with the chief's anger. He personally picked up a saw, picked up a cannon barrel with dissatisfaction on one hand. He placed it on the bracket and put it on it and pulled it suddenly.

The feeling from his hands made him stunned.

This is simply unscientific!

He thought that if he pulled this hard, the saw blade in his hand would break, at least it would slip on it and could not be sawed at all. However, the resistance feeling of saw blades being sawed into ordinary steel came from his hand.

The sky began to light up slightly. He put the cannon barrel in front of him and watched in disbelief. Yes, there was a silver-white saw mark on it! And it was at least ten silks deep! (One millimeter is 100 silks. Some state-owned units are called silks and some are called guides depending on the region.)

This is the hardest cannon steel, and it is also the cannon steel after quenching!

So soft.

"Huhuhuhu..." The director desperately began to saw the gun barrel as if facing an enemy.

Seeing this, Zhao Bingyi's chest was already burning with rage that made him almost crazy. Those bastards in charge of childbirth did not take the lives of frontline soldiers seriously!

"Saw everything!" He gave an order with a pale face. If the entire batch is like this, these responsible persons of the 2983 Factory will definitely be to blame!

Even if he killed his life, it would not be enough to make up for the sacrifices of the soldiers.

Commander Xu Shiyou didn't sleep all night. He could only go to bed in the early morning with the comfort of the guards and a group of veteran generals. After sleeping for more than an hour, he got up. He asked if the personnel sent by the backpack arrived. He heard that someone was sawing the cannon barrel on the 123rd Division.

I heard that the cause of the explosion has been found.

He immediately ignored the fatigue and bloodshot eyes, and even washed his face, so he asked the guard to drive him to come here.

It was already bright. Many gun barrels were sawed or broken. The wall thickness of the mortar barrel was not too thick. After the sky shone, Liu Yijiu began to hold a magnifying glass to observe all the gun barrels in the cut positions.

"Record. No. 1 gun barrel, the internal trachoma is obvious. It is suspected that the flaw detection or missed inspection is not carried out. At the same time, the grain structure is large and the heat treatment is not carried out..."

"Record, the No. 18 gun barrel has a large internal grain structure and loose tissue... It is suspected that no heat treatment process has been carried out..."

"Record, the No. 22 gun barrel has a coarse grain structure and a small and tight grain on the outer surface. It is suspected that the quenching time is insufficient, and the high-temperature tempering process has not been carried out..."

"Record……"

Liu Yijiu looked at each cut-out gun barrel with a magnifying glass.

These are not as good as microscopes, but they can have a clear understanding of the internal structure of steel. Of course, this must be achieved after observing a lot of metallographic structures!

"Director Zhao, most of these cannons are caused by not being heat-treated, or the heat-treated process is insufficient, and the time is insufficient. Some have been heat-treated, but because the material itself has casting defects and there are trachoma formed by bubbles left during casting, it will cause irregular deformation under high temperature and high pressure. It will gradually crack due to the high temperature and high pressure inside, and finally it will be too large to make the shell stuck in it, causing the blasting phenomenon..." After the inspection, Liu Yijiu took a lot of deep breaths, suppressed the anger in his heart, and then said to everyone with a serious face.

"Where are the bastards at the logistics equipment headquarters? Get out of here! I want to see what you bastards do for food. It's not the last time you have to take the lives of the warriors, because your incompetence has caused many warriors to die in vain!" Before Zhao Bingyi could answer, a crisp and angry young girl's voice came from outside the crowd.

Immediately afterwards, I saw a female soldier wearing a cadre uniform holding a handful of s75 made by Liu Yijiu, lifting the technicians around the outside and walking in with a frosty face... (To be continued...)

ps: Today's fifth update is here. First of all, thanks to xoo852 for becoming the third leader of this book.

Hulu knew that he was going to vote for Hulu for monthly votes, and at the same time, he also encouraged Hulu to continue to make updates. Hulu kowtowed again and thanked Hulu for his kindness!

There is nothing else to say, except for additional updates, there is no other way to repay the gourd!

Tomorrow, we will add five updates to the big ones alone!
Chapter completed!