Liu Yahui took the initiative to propose that he wanted to transfer to Yan Baosheng's senior engineer team.

Since Liu Yahui is leaving, Zhao Qingshan will not forcefully try to keep him.

Liu Yahui then defected to Gong Yan Gao, and Zhao Qingshan's special team was left with three people.

With the deepening of the 945 Steel Project, the research team has successively added some newcomers.

Zhao Qingshan's group maintained three people, and he said that our group was not fighting in the same group, and three people were enough.

945 Steel is offline in batches, and the supply state is hot-rolled. During the smelting and hot-rolling process, 945 Steel still has some problems that need improvement.

"Pick one radish and one radish, and reduce the sulfur content first." Zhao Qingshan said.

Sulfur exists in the form of sulfide inclusions in steel, which has adverse effects on the plasticity, toughness, welding properties, thickness direction properties, fatigue properties and corrosion resistance of the steel.

The sulfur content in high-quality steel is generally less than 0.02% to 0.03%, the desulfurization standard for 945 steel is more stringent, the recommended sulfur content in the supply state of 8~16mm is ≤0.01%, and the recommended sulfur content in the supply state of other specifications is ≤0.015%.

The sulfur content of 945 steel that has been offline is between 0.02 and 0.05%. After various performance tests, it is found that there is a certain gap between the supply standards.

In order to solve the problem of desulfurization, the research team held a technical discussion meeting, and the participants were Ye Guoli, General Engineer Tian and the leaders of each group.

"Desulfurization is not only for 945 steel. For other steel types, the lower the sulfur content, the better. Through RH refining, our Jianggang can make high-quality steel with a sulfur content of 0.02% and put it on the market, and won praise from customers. 945 steel is of great significance and a political task that must be completed. The military representative did not clearly stipulate the sulfur content in the performance standards, but we reiterated it based on the performance requirements. We hope that the sulfur content of 945 steel is less than or equal to 0.01~0.015%. High standards and strict requirements, we challenge the goal of 8~16mm supply sulfur content ≤0.01% to see what new desulfurization method is used to achieve the goal." Ye Guoli felt very urgency. The military representative required that the supply of 945 steel was February 28, 1989. Although there were still one year and eight months, there were many technical problems that needed to be solved. When you close your eyes and open your eyes, you would pass one year and eight months at once.

General Manager Tian looked at it and found that all the men who came to the meeting were gay men. He lit a cigarette, took a few breaths and said, "We are now using RH-added solvent to desulfurize. The sulfur content of 0.02% is already the limit. If we want to achieve less than 0.01%, we must adopt a new process method."

"What are the opinions of Lao Tian?" Ye Guoli's addiction to smoking came to his senses. He groped for a while, but found that he did not bring any cigarettes.

General Manager Tian handed a cigarette to Ye Guoli, saying: "Pittsburg is the steel capital of the United States. I went to a steel mill in Pittsburg in 1985 to exchange experience. The steel mill produced a small output, with an annual output of less than 2 million tons in 1985. However, they all refined high-quality steel, and some of them were exported to my country. In fact, I only stayed in the workshop of the steel mill in Pittsburg for half an hour. The Americans did not allow us Chinese to take photos, so we could only take a quick look. During that visit, I found that the desulfurization method of the United States was different from ours. They sprayed a desulfurization agent while blowing oxygen and decarbonizing RH, reducing the sulfur content to 0.01~0.015%.

"Oh?" Ye Guoli's eyes lit up and he asked, "What about?"

Chief Engineer Tian said: "Director Ye, you also know that these steel mills in capitalist countries have extremely high concentration of core technology technology. The United States only allowed me to watch in the workshop for half an hour, and what tricks can I see? I asked the key technical questions of the United States, and they also answered questions that were irrelevant. The United States is greedy for money. If you don't give them money, they won't give you real things."

"After returning from Pittsburgh, I have been studying the desulfurization method of the United States, but there is very little valuable research data. The current speculation is that the United States used calcium oxide-based desulfurization agents when refining RH, which should be the most advanced and efficient desulfurization method in the world. However, the specific technical details of the desulfurization agents in the United States cannot be obtained and can't be bought for money, and they have no idea of ​​making a transaction."

"The United States has atomic bombs for a long time. They will never provide us with even half a page of atomic bomb technical details. Don't we make atomic bombs? The mushroom cloud in Lop Nur is inspiring. If we don't give us technology, we will develop the technology ourselves!" Ye Guoli said suddenly excited. He said: "In terms of deep desulfurization, General Engineer Tian pointed out a new path that can be tried. Do you have any insights?"

Zhao Qingshan took the lead in speaking: "Director Ye, General Engineer Tian, ​​colleagues, I have to be honest. I have started to study the problems of deep desulfurization. Before the 945 Steel project was launched, I developed a small experience. With the deepening of the 945 Steel project, my idea of ​​deep desulfurization has become mature. General Engineer Tian pointed out very correctly. Calcium oxide-based desulfurization agent... To be precise, I think it is a calcium oxide-based calcium difluoride-based desulfurization agent, and it is very likely that Jiang Steel will achieve deep desulfurization with a content of less than 0.01%."

"Xiao Zhao, you can always surprise us, so please be more specific."

Zhao Qingshan walked to the blackboard in the conference room. He picked up the chalk and wrote, "The desulfurization reaction of molten steel is:

3(CaO)2[Al]3[s]=(Al2O3)3(CaS)

The desulfurization efficiency of water steel mainly depends on the aluminum content and slag index in the steel (S·P):

(S·P)=a^1/3    Al2O3/(%S)sat·aCaO

When (S·P) is equal to 0.1, the sulfur distribution ratio between slag and steel is the largest.

Therefore, the optimal composition of desulfurization slag is:

60%(CaO)25%(Al2O3)10%(SiO2).

RH powder uses CaOCaF2 desulfurization agent. The desulfurization ratio of this powder is calculated as:

La=(%S)/[%S]=1260-25(%     Al2O3)-75(%SiO2)±250

The desulfurization rate of steel water is: d[%S]/dt=-A/VKs{[%S]-[%S]e}
Chapter completed!