Siheyuan starts from a better life

Chapter 244, Alloy Steel
Seeing Guo Jianjun go out, Wang Tianlai, who was sitting there, said, "Jiang Gong, you see, we are so familiar, so don't call us Wang Gong and Zhang Gong. We are older than you, so I will be cheeky. You Call us Lao Wang, Lao Zhang, and we call you Lao Jiang, how do you like it?"

"It's okay, we're already familiar with each other. From now on, I'll 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, 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 him Xiao Jiang, so he didn't correct Wang Tianlai's name for him.

After talking about this matter, Jiang Yan didn't bother with the address, and directly brought the topic to the matter of writing the operating specification manual.

After hearing Jiang Yan finished speaking, Wang Tianlai said happily: "No problem, we both fully support you, if there is anything you need us to do, just ask."

"Yes, Jiang Gong, you can speak up."

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

"Why have you been here for so long?" Jiang Yan asked after taking a sip of the tea Guo Jianjun brought over.

"The logistics people forgot to prepare a teacup in the office. I brought this from the logistics."

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

He believed that Guo Jianjun would deal with the following matters.

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

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

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

When Zhang Xiang heard Jiang Yan's words, 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 caused by the quenching problem, which caused the deformation of the workpiece when it condensed later."

Quenching is to heat the steel above the critical temperature, keep it warm for a certain period of time, and then cool it at a rate greater than the critical cooling rate, so as to obtain an unbalanced structure mainly composed of martensite (and also obtain bainite or maintain single-phase austenite according to needs). ) of 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 don't think it's because of the quenching process that caused the deformation of the workpiece. Wait a moment."

After Jiang Yan said something, 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 and the cutting heat is too high. Excessive cutting force will cause the internal stress of the material to increase and cause deformation; if the cutting heat is too high, it will cause thermal deformation of the workpiece.

The second is that the rigidity of machine tools, cutting tools, and workpieces is insufficient. Under the action of cutting force and clamping force, machine tools, cutting tools, and workpieces produce elastic deformation due to insufficient rigidity, thus causing processing errors.

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

Hearing Jiang Yan's description of the three deformations of the workpiece, Wang Tianlai and Zhang Xiang quickly recorded them.

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

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

"If you are processing a fifth-level worker, I guess it should be a problem with the steel you use to make the parts."

After Jiang Yan said this, I didn't say anything again, and I didn't stop counting in my hands.

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

"Does Mr. Jiang have a solution?" After hearing what Jiang Yan said, Zhang Xiang asked again.

"Well, Lao Zhang, just wait a moment." After Jiang Yan said this, he picked up a piece of paper and quickly counted where.

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

"Old Zhang. You see, through calculation, your workpiece cannot reach this hardness and toughness after one quenching.

"If you want to achieve your effect, if you want to achieve this effect, according to my calculations, your workpiece is undergoing a second quenching when it is condensing, which should be barely able to achieve this effect without causing damage to the workpiece. Deformation, but in the final analysis, the hardness of the steel is not up to the standard."

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

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

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

"If my calculation is not wrong, the steel you use to produce the workpiece should be medium carbon steel."

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

In the 50s, the country mainly produced low-carbon steel and medium-carbon steel, and the ability to produce high-carbon steel was also a matter in the late 60s.

High carbon steel is often called tool steel, the carbon content is from 0.60% to 1.70%, and it 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 high-carbon steel with a carbon content of 0.85%.

Jiang Yan, who has traveled through time, naturally has the formula of high-carbon steel, but this is only a low-grade high-carbon steel formula, but right now Jiang Yan has a better steel formula than high-carbon steel, that is, chrome-vanadium alloy steel .

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

The 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 a major characteristic polymetallic mineral resource in my country, with huge reserves, and it is a multi-metal symbiosis such as vanadium, titanium, iron, chromium, etc., comprehensive utilization of resources Great value.

Especially the vanadium ore, the Yantouzhai vanadium mine in Guzhang County, Xiangxi, my country is called "the largest vanadium mine in Asia" in later generations.

Therefore, it is not difficult for our country to produce chrome-vanadium alloy steel. At least the country that produces these raw materials will not lack, and will not be choked by foreign countries.

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

(End of this chapter)