The boron-containing core wire is used to adjust the boron content. Zhao Qingshan and others set the boron content to be 0.003~0.005%.

Although the content of boron is small, it plays an important role in 945 steel. In theory, boron of 0.003~0.005% can significantly improve the yield strength and hardenability of 945 steel.

Carbon, silicon, manganese, nickel, chromium, molybdenum, copper and other elements also assume various functions, with the purpose of ensuring that the performance of 945 steel meets the standards.

Component setting is one aspect, and more importantly, smelting and rolling.

Zhao Qingshan and his team clearly arranged various elements, but whether they could be smelted on industrial equipment is a test.

This furnace of 945 steel was refined and sent to the continuous casting workshop. It was already late at night when the continuous casting billet was removed from the line.

Liu Yahui yawned and exhausted: "Ha...yawn, I can't stand it every day from 8 o'clock in the morning to turning the clock."

Zhang Tongqiao said quite energetic: "I can carry it with my body, but when I go back so late every day, my lover begins to doubt me."

Zhao Qingshan said: "Sister-in-law suspects Mr. Zhang? Then you have to prove your innocence to your sister-in-law overnight when you go home."

Zhang Tongqiao was stunned for a moment, then laughed: "The proof question has been done, never stopped."

"I haven't seen you prove the child," said Liu Yahui.

Zhao Qingshan pretended not to hear it, thinking that Liu Yahui's emotional intelligence was too low.

Zhang Tongqiao has been married for four years. He wants a child, but his lover has not been pregnant for a long time.

Although everyone knows this, you can't poke Zhang Gong's sore spot in front of him.

Zhang Tongqiao snorted coldly, his face gloomy.

"Okay, OK, stop off topic, test the data." Liang Minfang is the mother of a child, and she also wants to go home early.

The billets on the continuous casting line are ingot-shaped rectangular bodies with a width of 700~1600 mm, a thickness of 170 mm, 210 mm and 250 mm, a length locking ruler of 8~10 meters, a short locking ruler of 4~4.8 meters, and a single weight of 3.62~30.4 tons.

Steel billets are semi-finished products of steel, and after rolling, they become finished steel such as plates, bars, wires, etc.

After inspection by the quality inspector, the quality of the 945 billet was qualified.

Engineers used photoelectric spark direct measuring instruments and carbon sulfur analyzers for component detection, carbon 0.12%, silicon 0.60%, manganese 1.10%, phosphorus 0.018%, sulfur 0.020%, nickel 1.20%, chromium 0.50%, molybdenum 0.08%, copper 0.15%, boron 0.002%...

Liu Yahui rubbed his hands and said, "The ingredients data are OK."

Zhao Qingshan shook his head and said, "There is high sulfur and low boron, and 945 steel needs further improvement during the smelting process."

Liang Minfang said: "High sulfur and low boron have always been a major issue to be solved. This furnace of 945 steel was put off the line after continuous casting. All data in all aspects are in line with expectations. Report to the leader tomorrow morning and then hot rolling?"

"Okay, let's finish the work."

The four of them had been busy for a day and went back to their homes.

The next morning, Zhao Qingshan, the Steel Research Institute, reported to Ye Guoli as a representative: "This furnace of 945 billets has been sent to the hot rolling factory. During the smelting of the second steelmaking process, we discovered several pros and cons. The good news is that our rh deep decarbonization and dephosphorization are very powerful, and most alloy elements can be adjusted to the ingredients we want during the initial refining and refining."

"The chemical properties of boron are lively. In the RH refining process, it is indeed not easy to accurately control the boron content. We can fully deoxygenate the alloys such as aluminum and zirconium, fully fix nitrogen by adding titanium alloys, and then add boron-containing core wires to fine-tune the boron content. I think there is no problem with this process. Although it is not the best method, there is no better method, it can be used."

Ye Guoli looked at the data and asked: "Isn't the best method to consume precious metals to ensure the yield of boron and other trace elements? So Xiao Zhao, tell me, what is the best method?"

"I don't know either. I only know that the method we use is the best method at the current technical level." Zhao Qingshan replied, and he continued: "The refining technology of boron and other trace elements is difficult to update in the short term. We can only achieve the ultimate refinement in operation under the existing technology. For example, the timing of adding precious metal alloys, the amount of feeding, etc., can all be more refined in artificial operations. It would be great to increase the boron content by one to two. Practice makes perfect. I believe that our on-site operators can do it."

"In fact, what is more troublesome than boron is sulfur. Sulfur is a harmful impurity in steel. The more thorough the desulfurization, the better. We hope that the sulfur in 945 steel will be controlled below 0.01%, while the sulfur in this furnace of steel is 0.02%, which I am not satisfied."

"It's not just 945 steel, any steel other than silicon steel, deep desulfurization has been a long-term technical problem." Ye Guoli said, and he said: "I also know that the desulfurization method we use for added solvents is by no means the best method. On the world, the most good method of deep desulfurization is in the hands of Japanese and West Germans. Our 1.7 meters of Japanese and West Germans bought it. They did give us some advanced technology. However, major technologies including deep desulfurization were tight-lipped and they didn't even publish papers."

Zhao Qingshan nodded and said, "In a few years, we will enter the 1990s, so rely on yourself."

"What are Xiao Zhao's wonderful ideas?" Ye Guoli suddenly remembered that last summer, Zhao Qingshan said "Rely on himself", and then his self-developed paint was born.

Zhao Qingshan said: "I have a certain idea. Let's make a few furnaces of 945 steel first."
Chapter completed!