The situation has undergone some subtle changes. Under the supervision of Jianggang legal affairs and auditors, Zhao Qingshan and Baosteel team had friendly negotiations on the transfer of magnesium oxide-chromium trioxide-based coating patents.

A few months ago, he talked about the same patent with Nikko. Zhao Qingshan had no decision-making power, and he was not even qualified to take a look at the patent transfer contract.

The negotiations with Baosteel team went smoothly. Baosteel obtained the patent right of magnesium oxide-chromium trioxide coatings at a suitable price, promising to keep technical secrets for Jianggang, and hired Zhao Qingshan as a technical consultant. The employment period was not until the magnesium oxide-chromium trioxide coatings achieved the expected results in Baosteel's industrial production.

Baosteel gave Zhao Qingshan enough respect, and the technical support fee was paid according to the number of days on business trips. That is, Zhao Qingshan went to Baosteel for one day and received a one-day technical support fee of 20 yuan. During the trip to Shanghai, food and accommodation were calculated separately, and Baosteel would be responsible for the free travel.

"See you in Shanghai, Gong Zhao." Before leaving, Baosteel representatives showed a warm welcome attitude.

"There will be a time later and you will be safe all the way."

Zhao Qingshan waved goodbye. Jianggang, who was in a sweet love period, was fragrant even when Baosteel was far away and close.

In many details, Zhao Qingshan has gained unprecedented freedom, but in general, the patent fees paid by Baosteel still cannot enter Zhao Qingshan's personal pocket.

The first prize of the Ministry of Metallurgy, the Yangtze River Daily published a report to commend Jianggang, advanced individual in Jianggang, special technical consultant of Baosteel, candidate for the May 1st Labor Medal of Chuzhou Province... Zhao Qingshan, who has won a lot of personal honors, returned to the 945 Steel research group, his colleagues' attitudes changed significantly.

"Xiao Zhao is very charming." Zhang Tongqiao was very envious.

"My self-developed coating is essentially an auxiliary non-steel product, which is relatively niche. Only Nippon Steel abroad and only Baosteel domestically needs it."

"Just relying on a niche technological innovation alone, you will have won so many honors. If it is popularized and has a wide range of scientific and technological achievements, tsk... By the way, Xiao Zhao, the chemical composition of the non-temperature test board of 945 steel is initially determined. Well, this is it."

That day, Zhao Qingshan reminded Zhang Tongqiao that "so, this, this, this, this," and it was mid-April, and the chemical composition of the 945 steel test plate was finally finalized.

c=0.10~0.14%, si=0.50~0.70%, mn=1.0~1.10%, p≤0.025%, s≤0.010%, ni=1.0~1.4%, cr=0.50~0.60%, mo=0.08~0.12%, cu=0.15~0.30%...

This version of the chemical composition was obtained through a large number of tests by technicians such as Zhao Qingshan, Zhang Tongqiao, Liang Minfang, and Liu Yahui. Several furnaces of test plates have been refined and rolled.

Zhao Qingshan asked: "I'm sorry, due to other work arrangements during this period, I haven't come to the trial workshop much. What about the performance test data of these furnace test boards?"

"The seawater corrosion-resistant test board was sent to the laboratory of the Naval Academy of Engineering and entrusted them to conduct seawater corrosion-resistant experiments, but the results did not come out so quickly. Other performance test data are here." Liang Minfang patted a stack of documents on the table.

Zhao Qingshan read the document: "The yield strength is 440mpa, the tensile strength is 500mpa, the elongation is 20%, the impact absorption capacity is 32j... The data is unsatisfactory, it is a ferry, a warship, a ferry."

The purpose of 945 steel is the main structural steel of the first ship of 052, and the military representatives have proposed a lot of performance indicators.

From service to retirement, warships take the sea as their home. Warship steel plates must have good resistance to seawater corrosion. During the construction process, warships need to complete a series of processing processes such as welding, water and fire bending plates, and fire correction to ensure the stability and reliability of the ship and achieve the military goal of "if you get a few more enemies, let it bury it at the bottom of the sea." This puts high requirements on the performance of 945 steel.

"Col. Yu clearly put forward 18 performance indicators, and any of them failed, cannot be supplied to the shipyard. There are some unqualified items for our 945 steel test plate, which is expected. According to the research team's major plan, on May 4, it was 1.7 meters tall, and some elements must be refined at 1.7 meters tall, such as boron." Zhao Qingshan talked about his views.

"Theoretically, adding trace amounts of boron can greatly delay the precipitation of ferrite and significantly improve the yield strength and hardenability of the steel." Liang Minfang agreed.

Boron has active chemical properties and can easily combine with oxygen and nitrogen in steel, causing boron to lose its effect. Accurate control of boron content and uniform distribution in steel is a problem.

Jianggang's method is to fully deoxygenate the RH furnace by adding aluminum, zirconium and other alloys, fully fixing nitrogen by adding titanium alloys, and then adding iron boron or boron-containing core wire to alloy the boron alloy to consume precious metal titanium to ensure the yield of boron.

The above process operation must be achieved by relying on RH furnaces. As of April 1987, there were only 5 RH furnaces in China, including 3 in the Ministry of Mechanical and Electrical Machinery Factory, and the remaining two RH furnaces, Jianggang and Baosteel.

The equipment in the trial production workshop does not meet the conditions for external furnace refining, and Jianggang’s only RH furnace is in the steelmaking workshop of the Second Steel Plant.
Chapter completed!