The so-called quenching is a process during metal material processing. Simply put, it is to heat the metal workpiece to a certain appropriate temperature and keep it for a period of time, and then immerse it in the quenching medium to cool quickly. After the folk blacksmith shop forged various iron tools, the red iron tools should be quickly immersed in water for cooling. This is a way of quenching.

Processing processes such as quenching, tempering, annealing, normalizing, etc., collectively known as heat treatment processes, are important means to improve material performance. By accurately controlling factors such as media, temperature, time in the heat treatment process, the toughness, strength, hardness, wear resistance, fatigue strength of the material can meet the specified requirements. The knowledge among them is unfathomable.

As a material expert, Qin Hai has an in-depth understanding of the heat treatment process. He just glanced at the farm tools made by Fatty and the others and knew that this was not quenched. No. 65 manganese steel is a steel with excellent toughness and wear resistance, but if the correct quenching is not performed after processing, the steel will be softer, resulting in the current phenomenon of rolling blades.

Fatty and the others are apprentices who are half-loading of water, and they have little understanding of the processing technology issues. Even Qin Hai said the word "quenching". The word "quenching" for quenching should be pronounced as "crunching", but in the heat treatment major, people are used to pronunciating the pronunciation of "war", which is derived from the word "dimming fire" traditionally said in the northern folk tradition.

"What you said...is it a crisp fire?" the shorter one of the three young men asked tentatively.

"Well, you can read this way, too." Qin Hai compromised. Now it is not the time to popularize terms. As long as the other party understands what he means.

"We... couldn't find the water at that time." The short man replied in an inauspicious voice. As an apprentice, he had never eaten pork and had seen pigs running. He had seen the quenching process at least, but he didn't know what it was. When making these farm tools, perhaps as he said, because there was no convenient cooling water next to it, he skipped the process.

"What? Your iron tools were sold without even quenching. This is not a fake product!" Several farmers were convinced and shouted together. Although they did not understand industry, at least they had seen blacksmiths making irons, knew that quenching was the case, and they also knew that iron tools that had not been quenched were not easy to use.

"return the goods!"

"Refund the money!"

"Let them lose money!"

Several farmers shouted with confidence, waiting for Qin Hai to speak up for them.

"How about it, what do you guys think?" Qin Hai asked at the three young people.

The fat man's tone was a little soft and muttered, "They just wanted to blackmail us. We all use good steel... Even if there is no quenching, steel is always good steel... Such good steel is 50 cents cheaper than the blacksmith shop..."

He talked to himself, but the meaning he revealed was very clear, that was, he was unwilling to refund the money. The five farmers bought seven or eight of them, worth more than ten yuan. If they returned all the goods, they probably wouldn't be able to get it out.

Qin Hai saw the fat man’s embarrassment, and turned around and said to the farmers: “Dear uncles, can I propose a plan?”

"Tell me." Several farmers said.

Qin Hai said: "Since you have bought these brothers' farm tools, they must be able to use them at home. The steel used for these farm tools is indeed good, but there is only one process missing during processing. If you are willing, I will ask these brothers to return these farm tools to the furnace and add a quenching process. I promise that after the repair, the quality of these farm tools will be better than what you have used in the past. What do you think?"

"Hey, do you know what quenching is? We don't understand this." The fat man pulled Qin Hai's clothes behind his back, for fear that Qin Hai's words would all cheat them.

Qin Hai glared at the fat man with a look of regret, and said, "Since I dare to agree, I am sure... But you have to help me find a blacksmith shop and some quenching medium. I'll tell you later."

At this time, the farmers had simply exchanged opinions. They probably felt that there would be no result in getting entangled with Fatty and others. They really needed these farm tools, so they nodded and said to Qin Hai: "For the sake of your young man, as long as they can repair these farm tools and ensure that they will not be rolled up, we will not return them."

"Who can guarantee that you won't roll the blade!" The tall young man said inappropriately, "You can use a shovel as a tile knife to chop bricks, but you won't roll the blade?"

"If the quenching is done well, you can indeed not curl the blade." Qin Hai replied with a smile.

"Okay, just say to you, a young man. If you say that this shovel will not roll the bricks after quenching, I will buy all the farm tools on this stall!" The leading farmer had a provocation method before. In his heart, he also felt that Qin Hai's words were a bit exaggerated, but at this time, he could force the three young men to no avenge. Of course, he liked such things.

"What you said yourself? OK, buddy, tell me, how can we do quenching?" The fat man's passion was aroused by the farmer. He suddenly had a wish, that was, that Qin Hai could really deal with these farm tools to the point of cutting bricks without rolling them. In this way, he could use the farmer's words to force him to buy the rest of the farm tools. This was not just about how much money he could make, but about earning back all the face he had just lost.

Qin Hai looked at both sides, shook his head helplessly, and then said to the three young men: "To do quenching, you must first have a stove... Are you all from the factory? Should you go back to your factory or find a blacksmith shop? What do you think?"

"Find a blacksmith shop." said the short man. It is their private work they do. It is better not to involve such things in the factory.

"Not far away is Zhang Laosan's blacksmith shop. I'm familiar with him and I can take you there." The leader of the farmer pointed a direction and said.

"Okay." Qin Hai nodded and said to the young people: "There is another thing that you need to find. I need to prepare some quenching solution and use several chemicals. These drugs may only be found in the middle school laboratory. Who has anything to do with you?"

"I..." the short man raised his hand and replied, "My uncle is from the county..."

"Okay, the medicines I need are **, Asian**, and **. I will write down the name and quantity for you. You will go to your uncle immediately, get these medicines, and send them to Zhang Laosan's blacksmith shop." Qin Hai took out the paper and pen from his bag, wrote a few names, and handed them to the short man.

At this point, several young people can only obey their will. They also hope that Qin Hai can create a miracle for them and turn the passiveness around. The short man took the note handed by Qin Hai, spread his short legs, and ran towards the county.

After sending the short man away, Qin Hai greeted him. The rest of the people carried the farm tools on the stall. Under the leadership of the leading farmers, they arrived at a blacksmith shop located in a bungalow. Outside the door of the blacksmith shop, there was a sign hanging, which really said "Zhang Laosan".

"Third brother, I have something to disturb you." The leader shouted.

"Mangu, what are you here to buy again?...Well, why are there so many people?" Zhang Laosan came out of the house and saw so many people standing outside the door, and each of them was holding some farm tools, so he couldn't help but be stunned.

The farmer named Mangu went up and said the story in a few words. Zhang Laosan took the shovel with a roll of blade from Mangu's hand, looked at the blade, and said, "Well, it's indeed a good piece of steel, which is a pity... But even if you quench another fire, it's a bragging thing to use to chop bricks."

"Master Zhang, are you bragging? Can you let me try it first? If such good steel is quenched well, there should be no problem with chopping red bricks." Qin Hai went forward and said.

Zhang Laosan looked up and down at Qin Hai and said, "Are you the young man who knows how to quench? Where did you learn it?"

Qin Haidao: "I graduated from the Provincial Agricultural Machinery and Technical School and learned a little quenching in school."

"Haha." Zhang Laosan laughed, "It's good to learn in school. It's good. A newborn calf is not afraid of a tiger. I have all the stoves, anvils, and water. Just show your skills and let me, the old blacksmith, open your eyes."

His words were full of disdain, but his attitude was still quite enthusiastic. It is not difficult to say whether it is difficult or easy to say it. The easy thing is that it is nothing more than heating and then immersing it in water. It is difficult to say that it is because of some tricks in the heat. The quality of the quenching effect is reflected in the operator's judgment of the heat.

In Zhang Laosan's opinion, Qin Hai was probably a ignorant student. After learning a little bit of fur in school, he wanted to show off. He believed that Qin Hai would definitely do quenching, but the effect of quenching was probably much worse than that of his old blacksmith. He could not handle these farm tools to the point where he could cut bricks. It was just a joke for Qin Hai to achieve this effect.
Chapter completed!