Seeing Guo Jianjun walking out, Wang Tianlai, who was sitting there, said: "Jiang Gong, you see that we are so familiar, don't call us Wang Gong, Zhang Gong, we are older than you, I am cheeky, you call us Lao Wang, Lao Zhang, we call you Lao Jiang, you look good." ”

"It's okay, it's all so ripe, then I'll call you Lao Zhang, Lao Wang, don't call me Lao Jiang, just call me Xiao Jiang."

"It's a bit out of place! Your level is higher than ours, or we still call you Jiang Gong. ”

This Wang Tianlai is smarter than Zhang Xiang.

At this time, Jiang Yan also felt that it was indeed a bit inappropriate for them to call themselves Xiao Jiang, so they were not correcting Wang Tianlai's name for him.

After talking about this matter, Jiang Yan was not entangled in the title, and directly led the topic to the matter of compiling the operation specification manual.

After hearing Jiang Yan's words, Wang Tianlai said happily: "No problem, the two of us fully support, if there is anything you need us to do, just ask." ”

"Yes, Jiang Gong, you just speak."

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

"Why did it take so long?" Jiang Yan took a sip of the tea brought by Guo Jianjun and asked.

"The logistics staff forgot to prepare teacups in the office, and I went to the logistics 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 deal with the rest of the matter.

"Jiang Gong, I heard that you are majoring in metallurgy."

Coldly, Zhang Xiang, who was sitting there without saying a word, opened his mouth to ask.

"I'm learning to cure gold! Why do you have any problems that I need 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 teacup in his hand, took out a piece of paper from his pocket and handed it to Jiang Yan.

"Jiang Gong, can you help me see if the processing of this part is due to the problem of quenching, which caused the deformation of the workpiece when it was condensed later."

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

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

"No, I don't think it's because of the quenching process that the deformation of the workpiece will come together, you wait a minute."

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

Jiang Yan said while calculating, presumably 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, the cutting heat is too high, and the cutting force is too large, which will cause the internal stress of the material to increase and cause deformation; Excessive cutting heat can cause thermal deformation of the workpiece.

The second is that the rigidity of the machine tool, the tool and the workpiece is insufficient, and the machine tool, the tool and the workpiece are elastically deformed due to the lack of rigidity under the action of cutting force and clamping force, thus causing the error of machining.

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

Hearing Jiang Yan talk about the deformation of three kinds of workpieces, Wang Tianlai and Zhang Xiang quickly recorded it.

"What level of workers are you using to process this part?" Then Jiang Yan asked again.

"It's a fifth-level worker in the factory."

"If it's a Level 5 worker who is helping you with the processing, I'm guessing it's the steel you use to make the parts."

After Jiang Yan said this, he didn't say anything quickly, and he didn't stop calculating in his hand.

After a while, Jiang Yan raised his head and said to Zhang Xiang, who was waiting there: "That's right, it's a problem with steel, you see, this one just now has a certain gap in terms of hardness or toughness, and gives you a certain gap in processing parts." ”

"Is there a solution for Jiang Gong?" After listening to Jiang Yan's words, Zhang Xiang asked again.

"So, Lao Zhang, you're waiting." After Jiang Yan said this, he picked up a piece of paper and quickly counted it.

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

"Lao Zhang. You can see that your workpiece cannot achieve this hardness and toughness after one quenching.

"If you want to achieve your effect, if you want to achieve this effect, after my calculations, your workpiece should be barely able to achieve this effect when it is being condensed for the second time, and it should not cause deformation of the workpiece, but in the final analysis, the hardness of the steel is not up to standard."

"The method I told you is also a temporary remedy, even if the qualified parts are machined, his life will be reduced a lot."

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

When he said this, Zhang Xiang's voice was much lower.

"If I'm not miscalculated, the steel you use to produce the workpiece should be medium carbon steel."

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

In the fifties, the country mainly produced low-carbon steel and medium-carbon steel, and the production of high-carbon steel was also a matter in the late sixties.

High-carbon steels, commonly known as tool steels, have a carbon content ranging 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%.

As Jiang Yan, who has crossed over, naturally has this formula of high-carbon steel, but this is only a low-grade high-carbon steel distributor, but at the moment Jiang Yan has a better steel formula than high-carbon steel, that is, chromium vanadium alloy steel.

Chromium-vanadium alloy steel is better than high-carbon steel. Chromium vanadium steel is an alloy tool steel with chromium vanadium alloy elements, with a hardness of more than 60HRC after heat treatment, which is harder than high-carbon steel and has better wear resistance. Chromium vanadium steel has high hardness and 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, and also contains a small amount of carbon. Therefore, chromium vanadium steel has better mechanical and chemical properties than high-carbon steel, making it a better choice.

The two metals of chromium and vanadium belong to the associated mineral deposits in China.

About 80% of China's vanadium production comes from vanadium titanomagnetite, and vanadium titanomagnetite is a major characteristic polymetallic mineral resource in China, with huge reserves, and is a symbiosis of vanadium, titanium, iron, chromium and other polymetals, and the comprehensive utilization value of resources is very high.

Especially for vanadium mines, the vanadium mine in Yantouzhai County, Guzhang County, Xiangxi Province, China was called "the largest vanadium mine in Asia".

Therefore, the production of chromium vanadium alloy steel is not a difficult task for our country, at least the production of these raw materials will not be lacking in the country, will not be choked by foreign countries.

Chrome vanadium steel has very good wear resistance under specific working conditions and can also be produced with tank belts.

(End of chapter)