A few "degrees" came out of Wei Minsheng's mouth, making Zheng Yuan, who had never been exposed to this concept, feel at a loss.

"Dare to ask sir, what does this 'degree' mean?"

"In order to better determine the timing of quenching, we use the unit Celsius to distinguish between different temperatures.

To put it simply, water is about 0 degrees Celsius when it freezes, and about 100 degrees Celsius when water boils. ”

"It's understandable that the water is boiling at 100 degrees, but how do you know that my previous machete was heated to nearly 1,000 degrees?"

Wei Minsheng raised an infrared thermometer in his hand and said: "This instrument in my hand can measure the surface temperature of most objects, when you finished heating the machete before, the instrument displayed a record of 952 degrees, which has exceeded the upper limit of the optimal temperature by more than 100 degrees.

It has been found that the properties of steel are related to the arrangement of its internal elements.

The arrangement of the internal elements of the steel at high temperatures is called austenite, and the most ideal arrangement of the internal elements is called martensite.

The only way to convert the arrangement of elements in steel to martensite is through the phase transition of austenite during cooling.

Only if the cooling rate is greater than the critical cooling rate of the steel can the austenite be completely transformed into martensite.

The transition temperature range of this material is between 727 degrees and 760 degrees, and the austenite temperature is above 780 degrees.

In practice, we will try to lower the temperature of austenite, but we must ensure that all the steel is converted into high-temperature austenite, so we will generally choose a range of dozens of degrees above the critical temperature of austenite as the quenching temperature.

And the temperature you are heating is much higher than this optimal range, and under such temperature conditions, the temperature difference is too large to cause some austenite to be completely unable to smoothly convert to martensite.

That's what you have in the quenching process. ”

Looking at Zheng Yuan, who had his mouth open and a confused face, Wei Minsheng realized that this Zheng Yuan had not learned the relevant knowledge of Huaxiaguo.

Not to mention those strange technical terms, even simple mathematical symbols can't be understood, what he just said is a little difficult for him.

Wei Minsheng shook his head and said to Zheng Yuan: "Since you have met my conditions, this position will be held by you for the time being, and someone will come to handle the relevant matters of your family for you."

However, at your current level, you can only build some simple tools.

Therefore, in your spare time, you should participate in the study in the electric classroom more, otherwise if you can't even understand the operating instructions of these devices, you will be eliminated by others sooner or later. ”

After listening to Wei Minsheng's words, Zheng Yuan held back the ecstasy in his heart and said carefully: "Then what kind of tool is my current job to build?" ”

Wei Minsheng thought for a moment and said, "Those stub threaded steel bars in the material workshop, you can process them into chisels for stonemasons."

Those corner materials, after being classified, are first smelted into standard steel ingots, and I will arrange a literate person for you to classify and manage the materials.

We will tell you what to do with waste materials from other sources when the time comes to them. ”

"Okay." Zheng Yuan's words have not been much, but they are better than simple and clear.

Wei Minsheng took two steps, then turned around and said: "There are some other equipment in this workshop, especially the air hammer, which is much more convenient and labor-saving than you use a hand hammer after being familiar with it, and the impact force of 20 kilograms can meet the processing work of most small tools."

Of course, some of the equipment in this workshop may be taught how to use it one after another, and you can also watch it and learn a little more when the time comes.

However, most of these devices are electrical, and their power is far beyond what the human body can achieve, so it is very dangerous and may even be life-threatening if it is not operated in accordance with safety regulations.

In the process of learning, don't be greedy for more, it's best to figure it out one device at a time, and then learn the next device after you are familiar with it. ”

Wei Minsheng's words made Zheng Yuan's heart sink down, and then he remembered the unusual things about this workshop.

At least the colorless and formless flame terrified him, for this unpredictable state gave him a sense of uncontrol.

If you just smelt those leftovers into standard ingots, there is no big problem with the help of someone.

The tools used by blacksmiths are also very simple, especially the chisels made from those short steel bars, which only need to be heated at one end, hammered out of the chisel tip and then quenched.

In this process, the method of annealing, normalizing, quenching and tempering can be completely passed several times according to the method previously said by the gentleman who is said to be the president of Huaxia.

And what is the quenching temperature, although he is illiterate, but the person who helps should know this.

When the time comes, ask him to help him determine the heat, and he must be familiar with several supporting techniques of quenching, and strive to create a tool with similar strength as the machete as soon as possible.

In the chat, Zheng Yuan also heard that there are many details in the quenching process, and there are more than a dozen formulas of quenching agents alone, and there are several different quenching methods.

The best results can only be achieved by selecting the most suitable quenching agent and quenching method according to the different materials and the performance requirements of the building tool.

The things involved in these quenching agent formulas are not what Zheng Yuan can understand now, and without corresponding knowledge, Zheng Yuan is just a relatively "advanced" steel heat treatment worker.

Wei Minsheng is also disdainful of those farm tools made of scrap steel, but these farm tools can be sold to three other countries in exchange for what he needs.

Perhaps, under the condition of food and clothing, after a year of targeted study, this Zheng Yuan can really be qualified for this job.