"Chief Zhao, have the data of those cannons been counted? Also, which unit produces it? Have you done a detailed survey when it was manufactured? After such a few hours, Liu Yijiu felt that he should be able to investigate something.

On the Western Front, it was impossible to find out at all, it was all some guns produced in the late sixties, which had not been used, and this time they were pulled out of the armaments warehouse.

Liu Yijiu was surprised to find that many of the cannons didn't even have numbers on them!

If this is the case on the Eastern Front, there is no way to find out 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 the registration on our side, all these mortars are manufactured by the Guixi 2983 Factory......" Liu Yijiu didn't expect that the production unit had been found out here.

"Is the muzzle very badly deformed?" Liu Yijiu was surprised for a moment, and then asked.

"Yes, according to the analysis of this accident by our technicians, it should be a quality problem in the production process, some of the guns were produced in the past, pulled directly from the warehouse, and some of the guns were produced in recent months. Which of the bombed chambers is the latest to be transported to the front line not long ago. The officers and men of the army have been responding to a lot of artillery firing a few rounds and have to stop to cool the barrels, and those produced back then do have quality problems, so we put the latest production of guns into use, who would have thought that ......" Zhao Bingyi said helplessly.

Liu Yijiu nodded, indicating that he already knew.

And recorded the name of the unit of Factory 2983 in his own small book.

This is very important. If there is a problem in the use of ordnance and equipment, it must be held accountable according to the production batch number. Therefore, it has always been required that the technical data in the production process must be kept in the archives. These technical data include drawings, process specifications, quality inspection tracking cards, inspection records and a series of things.

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

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

What Liu Yijiu didn't expect was. Zhao Bingyi took him to see that in a small open space not far in front of the headquarters of the 123rd Division, dozens of mortars of various calibers were actually placed.

"The fighters of the mortar company would rather have grenades than use these guns anymore...... "Zhao Bingyi was saddened.

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

Liu Yijiu did not speak, but yawned Luo Tong and began to measure the caliber of these cannons under the light of the flashlights of the soldiers sent by Zhao Bingyi. Now they can do everything like this, only in arsenals or research institutions can there be hardness testing equipment and physical and chemical analysis equipment.

At that time, we can know what the specific cause is.

The data obtained is roughly the same as the batch of mortars on the battlefield on the Western Front, and Liu Yijiu has basically determined it now. The artillery on the Western Front should also be from the 2983 plant, if not from the same batch of materials.

"Master, there is a bulge under the barrel of this cannon......" After Liu Yijiu measured all the cannons, he just stood up, and Luo Tong, who was originally squatting on the ground and following him to record data, shouted.

There is no need to look at it with the naked eye, because the surface of the barrel has been processed and there is a surface treatment process, it is very smooth to the touch. If there is a bulge, anyone who feels a little better can feel it. Minor surface quality problems can only be felt by experienced masters.

Liu Yijiu hurriedly asked him to bring the cannon barrel over.

Touching one end with your hand makes it harder to look.

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

The steel used to make the barrel and the barrel is inherently very hard, and it is the steel used to make the barrel. In order to improve the cutting performance of the barrel. This makes machining easy, and the hardness is reduced by heat treatment before processing. At the same time, the organizational uniformity of the barrel material is improved, after rough machining. It is also quenched and tempered and heat-treated, then semi-finished, then quenched, and tempered at high temperatures......

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

In particular, some special cannon steels, after such processing, the barrel has very high high temperature strength and ablation resistance.

Only with good high-temperature strength will the barrel not be deformed due to the instantaneous high temperature, high pressure and friction when the gun is discharged.

"Director Zhao, please arrange for someone to sawn these cannon barrels, and have someone help me get a magnifying glass with the largest magnification you have here...... If nothing surprises, I think I've found the cause of the problem. Liu Yijiu's face was really ugly.

Those bastards who produced would dare to do such a thing!

"What the hell is the problem?" Zhao Bingyi didn't expect that this young man sent by the Fifth Machine Department would find out the reason so easily.

Isn't this a joke?

"It's just a guess now, we can't be sure until this is sawed open and the metallographic structure of the barrel is watched!" Liu Yijiu said with the anger in his heart.

Zhao Bingyi didn't say anything, but asked someone to go to the maintenance office to find a technician from the maintenance department to come here with these things that Liu Yijiu wanted.

"What? Sawing this barrel? Director Zhao, you're not kidding, are you? The hardness of this barrel is comparable to our saw blade, which can't be sawed at all, and once sawed, the sawtooth has to be smoothed...... "The master of the logistics maintenance department of the 123rd Division came here to see it, and it immediately became popular.

"If you are told to saw, you will saw, don't talk so much nonsense!" Zhao Bingyi now vaguely guessed why.

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

Only artillery steel that has not been quenched, or the quenching hardness is not enough, it is possible to cut it with an ordinary saw blade!

The chief, who had initially raised his objections, was furious with the chief. Personally picked up a saw, and with a disgruntled face, picked up a cannon barrel with one hand. Put the saw on the stand and pull it violently.

The feeling from his hand made him stunned for a moment.

It's simply unscientific!

He thought. If you pull it so suddenly, the saw blade in your hand will break, or at least it will slip on it, and it won't move at all. But there was a feeling of resistance from the saw blade sawing into ordinary steel.

The sky had begun to light up slightly, and he put the barrel of the cannon in disbelief to look at it, yes, there was a silver-white saw mark on it! And at least there are more than ten threads of depth! (One millimeter is 100 silk, and some state-owned units are called silk according to different regions.) Some are called guides. ）

This is the hardest cannon steel, and it is also quenched!

So soft.

"Huhuhu......" The director began to see the barrel of the cannon desperately, as if facing an enemy.

When Zhao Bingyi saw this, the raging anger in his chest had already burned him to the point of madness. Those bastards who are in charge of production don't take the lives of front-line fighters seriously at all!

"Saw it all!" With a blue face, he ordered and said, if the entire batch is like this, these people in charge of Factory 2983 will definitely be to blame!

Even if it is his old life, it is not enough to make up for the sacrifices of the soldiers.

Commander Xu Shiyou didn't sleep all night, and he was able to sleep in the early hours of the morning under the persuasion of the guards and a group of veteran generals. I slept for more than an hour and got up. When they came together, they asked if the personnel sent by the rear loading had arrived, and they heard that the 123rd Division was sawing the barrels.

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

Immediately, he couldn't care about the exhaustion on his face and his bloodshot eyes, and he couldn't even wash his face, so he asked the guards to drive him over in a car.

It's getting dark. Many of the barrels were sawn or broken, and the wall thickness of the mortar barrel was not too thick.

"Record. Barrel No. 1 with obvious internal trachoma. It is suspected that no flaw detection was carried out or that the detection was missed, and at the same time. The grain structure is coarse and has not been heat-treated......"

"Record, No. 18 barrel, coarse internal grain structure, loose organization...... It is suspected that no heat treatment process has been carried out......"

"Record, No. 22 gun barrel, the internal grain structure is coarse, the outer surface grain is fine and compact, it is suspected that the quenching time is not enough, and the high-temperature tempering process has not been carried out......"

Record ......

Every cannon barrel that was cut open, Liu Yijiu carefully watched it with a magnifying glass.

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

"Director Zhao, most of these cannons have not been heat-treated, or the heat treatment process is not enough, and the time is not enough. Some have been heat-treated, but because the material itself has casting defects, there are bubbles left in the casting and trachoma formed, so in the case of high temperature and high pressure, irregular deformation will appear, and gradually crack because of the high temperature and high pressure inside, and finally the deformation is too large, and the shell is stuck in it, resulting in the phenomenon of exploding the chamber...... "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 in the headquarters of logistics equipment? Get out of here! I'd like to see what you bastards do to eat, and it's not the same thing to take the lives of your warriors, because your incompetence has cost many warriors their lives in vain! Before Zhao Bingyi could answer, a crisp and angry young girl's voice came from outside the crowd.

Immediately after, I saw a female soldier wearing a cadre uniform holding a handful of S75 made by Liu Yijiu, and opened the technicians who were surrounded outside and walked in with a frosty face...... (To be continued......)

ps: Today's fifth shift arrives. First of all, thank you to xoo852 for being the third leader of this book.

Hulu knows that it is to vote for the gourd, and at the same time to encourage the gourd to continue to explode, the gourd kowtows again to thank the great kindness!

I don't have to say anything else, except for adding more, there is no other way to repay the gourd!

Tomorrow, separately for the big plus five more!