Ferro-molybdenum is a ferroalloy composed of molybdenum and iron, generally containing 50~60% molybdenum, and its main use in steelmaking is as an additive to molybdenum element.

The smelters operated a crane to send ferro-molybdenum to the rack next to the furnace, and Zhao Qingshan supervised closely and prepared for sampling and testing.

"Zhao Gong, now add ferro-molybdenum?" Regarding this question, Master Lu asked three times.

Master Lu, who has experienced a lot of battles in front of the furnace, has a lot of experience in front of the furnace, and according to the victories of smelting HSLA in the past, he feels that the furnace temperature is a little higher, and the feeding material into the furnace is the safest.

Zhao Qingshan gave the same answer for the third time: "Master Lu, believe me, plus, right now." ”

The 945 steel in the trial production stage is not linked to the annual output target of Jianggang, and it is expected that the refining will be scrapped.

A high sense of responsibility drove Master Lu to ask again and again, and he finally chose to believe Zhao Qingshan, sent iron molybdenum into the furnace, and urged the gunman to blow oxygen, and the furnace boiled and shot out scorching heat and white light.

"Master Lu, I had a bad attitude just now, and I spoke a little rushed, don't take it to heart. ”

"Zhao Gong, I don't blame you, it's all for work, I understand. Besides, in the Iron and Steel Research Institute, the main force is you engineers, and we workers listen to your command. ”

Speaking of this, Master Lu was quite melancholy.

Master Lu was originally the head of Class B of the No. 6 open-hearth furnace of a steel-making company, which was a 500-ton super-large furnace.

A large furnace means high output, but at the same time there is a high risk.

Because of an oversight, Master Lu smelted a furnace of steel when he was on duty one day, and all the high-quality steel became foreign steel, he hugged his head and cried, and after crying, he obeyed the arrangement of his superiors and transferred to the trial production workshop of the Steel Research Institute as the furnace manager of the pocket furnace.

Master Lu's experience was a disguised fate, he caused a major quality accident in the position of the head of the 500-ton open-hearth furnace, he voluntarily took responsibility, so he was assigned to the trial production workshop.

It's not that the trial production workshop is not important, but compared with the industrial production of ironworks, primary steelmaking, secondary steelmaking and various rolling mills, the smelting and rolling work of the trial production workshop is much easier, and the responsibility is much smaller.

As Master Lu said, the trial production workshop belongs to the Steel Research Institute, and even if the responsibility is to be investigated, it is also the responsibility of the main force engineers of the Steel Research Institute.

How to smelt this series of 945 test steel, what alloying elements to add, how much to add, and when to add, the engineers of the research group formulate the plan and are responsible for the whole process, and the trial production workers such as Master Lu can do it.

In the process of doing so, Master Lu maintained a certain spirit of skepticism based on his years of smelting experience and repeatedly reminded Zhao Qingshan that his motive was very simple, with a sense of responsibility and mission. This deserves Zhao Qingshan's respect.

There are also complaints, Master Lu himself did something wrong, and he bears the consequences himself, but a few leading cadres have done something wrong, and there seems to be no movement......

"There is still movement, Master Lu, the director of the confused workshop who made steel, and sent him to Beihu Farm to raise pigs. ”

"It is said that it is a fall, it is said that it is a pig raising, but in fact he is a horizontal transfer. ”

"Leave the main system of steelmaking to raise pigs, and change to Master Lu, will you go?"

"Then I definitely won't raise pigs, I can't afford to lose this old face!"

"Isn't this over, Master Lu, you are a seventh-level worker, and staying in the trial production workshop is also temporary, I believe that in the near future, you will eventually return to the furnace of the big furnace that you love all your life. ”

"Zhao Gong, what you said is good, I ...... Chen Gouzi, you are a banmadi, the oxygen gun is too close!"

Master Lu suddenly roared, and Zhao Qingshan was also frightened.

But in front of the furnace, the gunman Chen Gouzi was unstable and his soul was unstable, and the oxygen gun he was holding was too close to the furnace, which might burn through the furnace and cause the molten steel to leak!

Fortunately, Master Lu found out in time, Chen Gouzi suddenly sobered up, he adjusted the position of the oxygen gun, and the potential safety hazards were strangled in the cradle.

"Xiong Gouzi, you go!" Master Lu was still not worried about Chen Gouzi, and he immediately arranged for another gunman, Xiong Gouzi, to replace Chen Gouzi.

"Chen Gouzi, what's the matter with you, you're going to kill Lao Tzu? You burned the stove through, we're all finished! Didn't rest well? I can see that you really haven't rested well. Forget it, go back to sleep, recuperate and come back to work. ”

Master Lu sent Chen Gouzi away, and he explained to Zhao Qingshan: "Chen Gouzi's family of six is crowded into the unity household, and there is a one-year-old boy in the house, which is quite noisy. ”

"He couldn't sleep yesterday, and he definitely won't be able to sleep today, he will never be able to sleep, Master Lu, you can't let him operate a gun anymore, it's dangerous, you can arrange for him to do other work." ”

"There are some things I don't want to say, but I have to say that you can't bully honest people when it comes to dividing the house. ”

"Chen Gouzi didn't apply for a bigger house?"

"He has applied for a long time, and he has been waiting for several years without results, but there is no way, the housing is tight, and everyone is waiting. ”

There was no danger, and everything was business as usual after this little episode.

Master Lu personally took the sample, and Zhao Qingshan began the test.

Molybdenum is the most strongly inhibiting pearlite transition, which significantly increases the stability of cold austenite in the pearlite transition region and prolongs the gestation period of phase transition. The CCT curve of steel has two noses, that is, there are two maximum transition velocity values, while bays appear in the range of 500~600 degrees Celsius, that is, the austenitic stability zone.

"Nickel has had a positive effect on molybdenum, Sister Liang, we succeeded...... Phased success. Zhao Qingshan is excited, and among his several engineer teammates, Liang Minfang is the most effective.

"Xiao Zhao, come on, come on, we are right on the data. Zhang Tongqiao, Liu Yahui, the two of you come together. ”

Liang Minfang called on his teammates to have a small meeting and go through the data.

After dozens of furnaces of test steel, the content of each element in the chemical composition of the 945 steel 16mm supply state test plate was gradually determined, and the unknowns were solved one by one.

"The carbon content is 0.10~0.14%, which we determined together. The chromium content is 0.50~0.60%, and the molybdenum content is 0.08~0.12%, and the content of these two alloying elements is obtained by me through a large number of tests, and it seems to be more reliable at present. Of course, the real examination room is the second steelmaking and hot rolling mill, so let's wait and see. Zhao Qingshan was the first to complete the test task assigned to him by the group, which was efficient and accurate, and deserves praise.