The two of them ate for nearly two hours at this dinner in the evening, and they also talked about a lot of things during this period, and at this moment, Jiang Jianhua really let go of some of the prejudices he had against Duan Yun before, and he admired this young man who was a generation younger than himself more and more.

Jiang Jianhua was especially surprised by Duan Yun's business acumen and financial resources, Duan Yun told him something about his business of repairing electrical appliances and antennas, which itself is a legitimate business, so there is nothing to shy away from.

It's just that Duan Yun didn't reveal his true family background to Jiang Jianhua, but just said that now he is already a 10,000 yuan household, and the business outside is more than his salary.

Moreover, Duan Yun's mature speech and mind also changed Jiang Jianhua's previous impression that he was a 'stunned youth', which was indeed beyond his expectations.

Jiang Jianhua has always been mixed with Yuan Xuedong before, Yuan Xuedong may be richer than Duan Yun, but he is not as generous as Duan Yun, and he has also given Jiang Jianhua some small favors before, but compared to Duan Yun's big sum of eight hundred yuan, it is not worth mentioning.

And the most important thing is that Duan Yun promised to 'lend' money to his youngest son when he got married in the future, which is undoubtedly equivalent to solving Jiang Jianhua's biggest worries in his life, so he finally moved this time and planned to follow Duan Yun for a long time.

Moreover, Duan Yun has academic qualifications, skills and backers, and his future is limitless, standing on this 'mountain', even if he falls, he will not fall heavily, after all, just because Duan Yun is a college student, there is no doubt that he will be reused in the future.

The more the two talked, the more cheerful they became, and Duan Yun packed the remaining bottle and a half of Moutai and the wine and food on the table and stuffed it to Jiang Jianhua, he knew that although Jiang Jianhua was the secretary of the factory, he actually lived a frugal life, and these drinks and dishes were enough for his family to eat two meals.

Jiang Jianhua, who got the things, was also very happy, and now he has begun to flatter Duan Yun in person.

After the two left the hotel, Duan Yun drove Jiang Jianhua to the door of the community, and then waved each other away.

After seeing Duan Yun's car leave, Jiang Jianhua's face showed a smile, he didn't go upstairs to go home immediately, but walked under the street lamp, opened his leather bag and took out the paper bag containing money.

The money came too easily to make Jiang Jianhua feel a little unreal, and he also wanted to feel the thickness of the pile of banknotes.

However, when Jiang Jianhua took out the bag of banknotes, he took out a few pieces of letter paper in the bag.

Jiang Jianhua picked up the letter from the ground and took a look at it, and found that this was the application material for reporting Duan Yun that he wrote when he was at work during the day.

The next moment, Jiang Jianhua took out the remaining reporting materials in his bag, tore them into pieces in three or two, and then threw them into a pile of garbage on the side of the road......

......

The next morning, Duan Yun went to work at the company as usual.

Today, Duan Yun's plan is to solve the heat treatment process of gears.

Heat treatment is a very important procedure in gear processing, which can improve the hardness of gears and improve their mechanical properties.

The basic requirements for gear materials are: the tooth surface should have enough hardness and wear resistance, the tooth center should have enough toughness to prevent various failures of the tooth surface, and at the same time, it should have good cold and hot processing processability to meet the various technical requirements of the gear.

Commonly used gear materials are various grades of high-quality carbon structural steel, alloy structural steel, cast steel, cast iron and non-metallic materials. Generally, forgings or rolled steel are mostly used.

In Duan Yun's previous life, the production of gears was mainly based on 20CrMnTiH steel, and at the same time, according to the processing technology of different models and different gear factories, 20CrMnTm can be divided into H1, H2, H3 and other sub-steel series with different hardenability bandwidths, which are carburized steel, carburized steel is usually low-carbon steel with a carbon content of 0.17%-0.24%, and the domestic automobile wheel processing in later generations is basically this kind of steel.

However, at present, Duan Yun can only use the low-carbon steel produced in the steel casting workshop of the main factory, and the performance is not very good just now, but it can basically meet the requirements of the current domestic manufacturers.

There is a small heat treatment workshop here in the big collective, the place is not big, there are two domestic ones in the seventies, but they have not been used much, and they are basically in an idle state all year round, so Duan Yun is ready to restore the machine to use again this time.

In later generations, gear factories used carburizing furnaces for heat treatment of gears, but there is no technology and equipment in this area in China at present, and only heating furnaces with simple designs can be used.

In the past, when Duan Yun was in the main factory, he had a detailed understanding of the heat treatment process procedures of the main factory, and found that the heat treatment process left by the earliest Soviet Union had seriously lagged behind, and the hardness and mechanical properties of the gears after heat treatment were average.

In this regard, Duan Yun thought of an improvement plan by recalling the various parameters of heat treatment in the factory when he worked in the locomotive factory in his previous life.

Duan Yun's improvement scheme is to normalize at 950 °C, which is 50 °C higher than the original process, which can further eliminate forging stress and refine grains. The one-time co-infiltrating direct quenching replaces the original one-time carburizing and second-heating quenching process, which not only simplifies the process, but also avoids the oxidative decarburization caused by multiple heating and cooling.

Co-infiltration 890 °C is 30 °C lower than the carburizing temperature, so that during quenching, it slows down the decomposition rate of austenite below the point, reduces microstructure stress and thermal stress, not only reduces deformation, but also makes the austenite more stable due to nitrogen infiltration, thereby improving the hardenability of the co-permeable layer.

In Duan Yun's view, if it is processed according to his heat treatment process, then the heat treated gear, regardless of strength or other parameters, will be higher than the gear of the main factory.

For a whole morning, Duan Yun was organizing workers to repair and debug the two furnaces, replacing some aging and corroded wiring and components.

"Master. At noon, when he was about to get off work, the army entered the workshop and found Duan Yun, handed over a form and said, "This is the attendance sheet of each department in the morning." ”

"Hmm. Duan Yun took the attendance sheet and glanced at it, then said to Dajun, "Dajun, help me do something this afternoon." ”

"What's the matter?"

"You take this money, ......" Duan Yun took out a few banknotes from his pocket as he spoke, handed them to the army and said, "After you finish eating at noon, go into the city to buy some snacks, what dried apricots, sorghum syrup, white rabbit toffee, spiced melon seeds or something, buy more......

"Why are you buying so many snacks?" Dajun was stunned when he heard this, in his impression, Duan Yun basically had no hobby of eating snacks except for smoking.

“...... After buying things, I wrapped them into a big bag, and after I went to work at the main factory in the afternoon, she helped me send them to Cheng Qingyan and told him that it was inconvenient for me to go to the main factory now, and I would look for her at night. Duan Yun said.

The reason why Duan Yun asked Dajun to buy snacks and send them over was actually to maintain the 'temperature' of the current relationship between the two and make a gesture of actively pursuing Cheng Qingyan.

Girls' minds are generally very sensitive, especially to the boys they like, if it was before, the two were just ordinary classmates and colleagues, and they only needed to get along normally, but now Duan Yun has confessed to Cheng Qingyan and began to develop in the direction of lovers, so Duan Yun can't be as casual as before, he must be more active and enthusiastic, and always let Cheng Qingyan understand that he has been thinking about her all the time......

"No problem! When the army heard this, he was stunned, and then replied with a smile.

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