Siheyuan starts from a good life

Seeing Guo Jianjun walking out, Wang Tianlai, who was sitting there, said: "Jiang Gong, you see we are so familiar with each other, so don't call us Wang Gong or Zhang Gong. We are older than you, so I am shameless. You Call us Lao Wang, Lao Zhang, we’ll call you Lao Jiang, do you think so?”

"It's okay. We are all so familiar. From now on, I will call you Lao Zhang and Lao Wang. Don't call me Lao Jiang, just call me Xiao Jiang."

"This is a bit inappropriate! Your level is higher than ours, otherwise we would still call you Jiang Gong."

This Wang is always smarter than Zhang Xiang.

At this time, Jiang Yan also felt that it was a bit inappropriate for them to call him Xiao Jiang, so he did not correct Wang Tianlai's name for him.

After talking about this matter, Jiang Yan didn't worry about the title and directly brought the topic to the matter of writing an operating manual.

After hearing what Jiang Yan said, Wang Tianlai said happily: "No problem, we will fully support it. If there is anything you need us to do, just ask."

"Yes, Jiang Gong, just ask."

At this time, Guo Jianjun came over with three cups of tea and placed one cup each next to Jiang Yan and the others.

"What took you so long?" Jiang Yan asked after taking a sip of the tea brought by Guo Jianjun.

"The logistics people forgot to prepare teacups in the office. I went to the logistics department to get this temporarily."

Hearing Guo Jianjun's words, Jiang Yan nodded, indicating that he knew and he also understood the twists and turns.

He believed that Guo Jianjun would handle the rest.

"Gong Jiang, I heard that your major is metallurgy."

Suddenly, Zhang Xiang, who was sitting there silently, asked.

"I'm studying metallurgy! Why do you have any problems that you need me to solve?"

When Zhang Xiang heard Jiang Yan's words, a hint of surprise flashed in the corner of his eyes. He put down the tea cup in his hand, took out a piece of paper from his pocket and handed it to Jiang Yan.

"Mr. Jiang, can you help me check whether the processing of this part is due to quenching problems, which caused the deformation of the workpiece during subsequent condensation."

Quenching is to heat the steel to above the critical temperature, hold it for a certain period of time, and then cool it at a rate greater than the critical cooling rate to obtain an unbalanced structure dominated by martensite (bainite or single-phase austenite can also be obtained as needed) ) is a heat treatment process. Quenching is the most widely used process method in steel heat treatment process.

There are roughly four basic processes for steel heat treatment: annealing, normalizing, quenching and tempering.

"No, I feel that the deformation of the workpiece is not caused by the quenching process. Please wait a moment."

After Jiang Yan said this, he quickly walked to his desk and began to calculate the part.

Jiang Yan said while calculating, I think you should also know that the deformation of general workpieces should be divided into three situations.

The first is that the cutting force is too large and the cutting heat is too high. Excessive cutting force will cause the internal stress of the material to increase and cause deformation; too high cutting heat will cause thermal deformation of the workpiece.

The second is that the machine tool, tool, and workpiece have insufficient rigidity. Under the action of cutting force and clamping force, the machine tool, tool, and workpiece will elastically deform due to insufficient rigidity, thus causing processing errors.

The third workpiece clamping method is incorrect. During the processing of the workpiece, the workpiece is deformed due to improper application point of the clamping force, excessive clamping force or inaccurate positioning surface.

After hearing Jiang Yan talk about the three deformations of the workpiece, Wang Tianlai and Zhang Xiang quickly recorded them.

"What level of workers do you use to process this part?" Jiang Yan then asked again.

"He's a level five worker in the factory."

"If the person processing it for you is a Level 5 worker, I guess it's a problem with the steel you used to make the parts."

After Jiang Yan said this, I didn't say anything anymore, and he didn't stop to calculate in his hands.

After a while, Jiang Yan raised his head and said to Zhang Xiang who was waiting there: "That's right, it's just a problem with the steel. You see, there is a certain gap between the hardness and toughness of the parts we machined for you. "

"Does Gong Jiang have any solution?" After listening to Jiang Yan's words, Zhang Xiang asked again.

"Okay, Lao Zhang, please wait a moment." After Jiang Yan said this, he picked up a piece of paper and quickly started counting.

After a while, Jiang Yan stopped the pen in his hand.

"Lao Zhang. You see through calculations, your workpiece cannot achieve this kind of hardness and toughness after one quenching.

"If I want to achieve your effect, after my calculations, if your workpiece is quenched for the second time during condensation, it should be barely able to achieve this effect without causing damage to the workpiece. deformation, but in the end the hardness of the steel is not up to standard.”

"The method I told you is also a temporary remedy. Even if qualified parts are processed, its lifespan will be reduced a lot."

"This is the best steel I can find in China at this stage. In the past, almost all the steel used to produce this kind of workpiece was imported from SL."

When he said this, Zhang Xiang's voice became much deeper.

"If my calculations are correct, the steel you use to produce the workpiece should be medium carbon steel."

"It's medium carbon steel," Zhang Xiang whispered.

In the 1950s, the country mainly produced low-carbon steel and medium-carbon steel. It was only in the late 1960s that it was able to produce high-carbon steel.

High carbon steel, often called tool steel, contains carbon from 0.60% to 1.70% and can be quenched and tempered. Hammers, crowbars, etc. are made of steel with a carbon content of 0.75%; cutting tools such as drills, taps, reamers, etc. are made of steel with a carbon content of 0.90% to 1.00%.

According to speculation, Zhang Xiang's workpiece should be suitable for high-carbon steel with a carbon content of between 0.85%.

Jiang Yan, who has traveled through time, naturally has a formula for high carbon steel, but this is just a low-grade high carbon steel formula. However, Jiang Yan currently has a better steel formula than high carbon steel, which is chromium vanadium alloy steel. .

Chromium vanadium alloy steel is better than high carbon steel. Chromium vanadium steel is an alloy tool steel with added chromium vanadium alloy elements. After heat treatment, the hardness is above 60HRC. It is harder than high carbon steel and has better wear resistance. Chromium vanadium steel has high hardness and high toughness, which is better than pure carbon high carbon steel. The chemical elements of chromium vanadium steel are different from carbon steel, containing iron, chromium and vanadium, as well as a small amount of carbon. Therefore, chromium vanadium steel has better mechanical and chemical properties than high carbon steel and is a better choice.

These two metals, chromium and vanadium, are associated mineral deposits in my country.

About 80% of my country's vanadium production comes from vanadium-titanium magnetite, and vanadium-titanium magnetite is my country's major characteristic polymetallic mineral resource with huge reserves. It is a symbiosis of vanadium, titanium, iron, chromium and other multi-metals, and the resources are comprehensively utilized. Great value.

Especially for vanadium mines, the Yantouzhai vanadium mine in Guzhang County, western Hunan, my country was later called "the largest vanadium mine in Asia".

Therefore, it is not difficult for our country to produce chromium-vanadium alloy steel. At least the countries that produce these raw materials will not be short of it and will not be strangled by foreign countries.

Chromium vanadium steel has good wear resistance under specific working conditions and can also be used in the production of tank belts.