Leng Yuming and Xiao Dongping were sighing that Qin Hai was a demon, and this demon was also doing even more demonic things in the foundry workshop at this time.

"No. 40 chrome steel, 500 grams."

"12 chromium-nickel steel, 300 grams."

"Manganese steel No. 65, 1200 grams ......"

Qin Hai took a note and reported the numbers one by one, and Ning Mo, Yu Haitao, Miao Lei, and Wang Xiaochen were busy looking for the specified model in a large pile of iron shavings and steel filings like garbage, and then weighed them with a balance, and then poured them into a hopper to prepare for smelting.

This is already after work, the workers on the day shift in the workshop are gone, due to the lack of production tasks in the factory, there are only three or four workers on the night shift in the foundry workshop, and they are all doing their own work, and no one cares what these young people are busy with.

Wang Xiaochen was temporarily pulled by Qin Hai to help, because weighing these metals requires the balance of the laboratory, and Wang Xiaochen, as a flaw detector, also belongs to the operator of the laboratory and has the right to use the balance. In addition, Qin Hai also found that his little friends had no problem doing some rough work, but if it was more appropriate to say that such a job as fine weighing had to be done by girls.

Wang Xiaochen didn't know what Qin Hai wanted to do, but she was a single female worker, and she didn't have anything to do anyway, Qin Hai asked her to help, so she happily stayed. Seeing Qin Hai preparing these scrap metals with a clear eye, she felt quite mysterious.

"Alright, it's finally trimmed." Qin Hai put down the note in his hand, wiped the sweat from his head, and said with relief.

The alloy steel that Qin Hai wanted to refine was an ultra-high-strength alloy steel that was only developed at the beginning of the 21st century, and in this era, the theory of this alloy steel had not even been proposed. Through precise control of the specific gravity of various elements such as chromium, manganese, vanadium, molybdenum, silicon and other elements in the alloy steel, coupled with a special heat treatment process, the strength of this alloy steel can be more than three times higher than that of the general high-strength steel, and it is used to manufacture important stressed components such as aircraft landing gear in later generations.

Relying only on some scrap steel as raw materials, and the smelting equipment is relatively simple, Qin Hai knows that the alloy steel he smelts will definitely not achieve its best performance in theory, but it can definitely be regarded as overkill when used to make a military dagger. He could assure him that the soldier's nephew would never have found a better material than this steel.

To use various alloy steel scraps collected from all over the place to formulate the formula of ultra-high-strength alloy steel, it cost Qin Hai a lot of brain cells. The amount of scrap varies depending on the metal elements contained in various alloy steels, which is equivalent to solving a linear programming problem with a number of constraints. Fortunately, Qin Hai's mathematical skills are still quite good, and such a complex problem has actually allowed him to solve it.

"Is it possible to melt steel now?" Miao Lei asked eagerly.

"That's it." Qin Hai replied.

There is a small power frequency induction furnace with a capacity of 150 kg in the foundry workshop, which is usually used to cast some small workpiece blanks, and now it is used by Qin Hai to smelt this ultra-high-strength alloy steel. At this point, Qin Hai is very grateful to Wei Baolin, if it weren't for Wei Baolin to change the management system of the factory to a mess, Qin Hai would not be able to use the equipment in the workshop so freely to do his own private work.

The electric furnace started up, the temperature of the furnace rose little by little, and the scrap steel in the furnace began to make a rumbling sound. This kind of electric furnace has the function of electromagnetic stirring, after the scrap steel is turned into molten steel, it will be fully mixed in the furnace, so that the distribution of various elements in the molten steel becomes uniform.

Qin Hai's eyes were firmly fixed on the thermometer on the electric furnace, constantly adjusting the power of the electric furnace to ensure that the temperature in the furnace was controlled at the specified level, neither too high nor too low.

The smelting process lasted for nearly half an hour, and Qin Hai issued a warning to everyone: "Okay, everyone stay back and prepare for steeling." ”

Everyone retreated, leaving only a few pre-made sand molds on the scene. This sand mold was made by Ning Mo with the drawings designed by Qin Hai when he was working during the day, and this little work is not worth mentioning in the foundry workshop at all.

Qin Hai in the previous life did not personally do the work of casting, but the predecessor of his life was a student who studied casting in a technical school, so he was no stranger to the operation of casting. He pressed the button and turned the furnace over, pouring orange-red molten steel into the sand mold. The molten steel exudes scorching heat, flows through the cavity of the sand mold, and then gradually cools and condenses into a blue-blue metal.

"What are you doing?" A worker on the night shift saw the excitement and came over to ask.

"Make something small." Ning Mo replied ominously.

"Ha Luha, you are doing private work, in case you are caught by Director Miao, you are good-looking." The worker grinned and threatened.

"Master Chen, don't worry, I told my father, and he agreed." Miao Lei replied half-truthfully. He actually greeted Miao Funan in advance, but the reason he said was to accompany Qin Hai to do some material experiments. Miao Funan knew that his son would secretly do some private work on weekdays, and since the workers in the whole factory were doing this, he himself was too lazy to restrain his son, so he has always turned a blind eye to such things.

After the workpiece is cooled, it is machined, that is, various treatments such as drilling and cutting edges are carried out on metal cutting machines such as lathes and milling machines. Qin Hai is a thoughtful person, he has considered the requirements of machining equipment in advance, so the strength of the steel he chose is not high before heat treatment, and it can be cut with ordinary machine tools. The ultra-high strength of the material is achieved by a series of heat treatments after machining.

Machining can only be done by looking for workers on the night shift in the metalworking workshop, and Ning Mo took care of it, holding a bunch of workpieces to find someone to help one by one.

I don't know if it's because of Ning Zhongying, Ning Mo's popularity in the factory is very good, and almost anyone who finds someone to help will give face. Of course, Ning Mo is not an eyeless person, asking others to help, and throwing a pack of eight-cent cigarettes in someone's toolbox to show gratitude is the least thing to do.

Since there were many places where he needed to find someone to help, Ning Mo sent out a whole cigarette in one night, and put all the money he earned from selling farm tools the day before yesterday. However, Ning Mo was not distressed by this at all, Qin Hai instilled in him the concept that he was reluctant to let the child trap the wolf, and if he wanted to make a lot of money, the small money that should be spent must not be saved. Ning Mo was originally also an atmospheric person, and after listening to Qin Hai's words, he was even more reluctant to work hard.

Several people were busy from the end of work in the afternoon until late at night, and the military dagger that Zhang Laosan wanted and the few other ordnance designed by Qin Hai were ready. Based on the theory he mastered, Qin Hai did heat treatment on several products, and tested their mechanical properties, and a satisfied smile bloomed on his face.

"How is it, Qin Hai, have you succeeded?" Several friends asked him anxiously.

Qin Hai nodded and said, "It's successful, although it hasn't reached the most ideal state, but this knife edge is definitely much harder than your shovels." ”

"Can you try it?" Yu Haitao asked.

"What should I do if I try it badly!" Ning Mo patted Yu Haitao's head. It would be a tragedy if something that took so much effort to make it was tried and tested.

Qin Hai said with a smile: "We have already measured the mechanical properties, so there is no need to use it to split bricks, right?" ”

"You don't have to try it, can the things Qin Hai make still be fake?" Ning Mo said. He took these things, looked at the steel mouth and color of the knife, and was so happy in his heart that he couldn't get enough of it.

"Fatty, don't look at it, you put all these things away, go back and contact Zhang Laosan, and see when the brute nephew he said will come to the county seat." Qin Hai explained to Ning Mo.

Ning Mo nodded and said, "No problem, I'll contact him tomorrow." However, it doesn't matter if he comes or not, it's better for us to keep such a beautiful thing to play by ourselves. ”

Qin Haidao: "Don't think like that, we are working so hard, not to make a toy for ourselves." These things are the foundation of our fortune, and they can't be sold too cheaply. By the way, if the other party comes, don't talk nonsense, just watch me talk to him. ”

"Qin Hai, don't worry, we all listen to you." Several friends all agreed loudly, they had become more and more superstitious about Qin Hai's charm.

Early the next morning, Ning Mo rode his bicycle to Zhang Laosan's blacksmith shop, told him that the dagger was ready, and asked him to notify the nephew of the barbarian to inspect the goods. Zhang Laosan readily agreed, and made an appointment with Ning Mo to meet at the blacksmith shop at dinner.

It was also at this time that Xiao Dongping, who had not slept well all night because of excitement, also carried a canvas bag containing 40 rotary tillage blades and boarded a long-distance bus bound for the provincial capital of Hongze City.