The situation has undergone some subtle changes, and under the supervision of Jianggang's legal and auditors, Zhao Qingshan and the Baosteel team had a friendly negotiation on the patent transfer of magnesium oxide-chromium trioxide coatings.

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

The negotiation with the Baosteel team went smoothly, and Baosteel obtained the patent right to use the magnesium oxide-chromium trioxide coating at a suitable price, promised to keep the technical secrets for Jiangsteel, and hired Zhao Qingshan as a technical consultant to achieve the expected results in the industrial production of magnesium oxide-chromium trioxide coatings.

Baosteel gave Zhao Qingshan enough respect, and the technical support fee was paid according to the number of business days, that is, Zhao Qingshan received a technical support fee of 20 yuan for one day when he went to Baosteel. During the period of travel, accommodation and food in Shanghai, Baosteel will take care of it.

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

"There will be a period later, and the journey will be safe. ”

Zhao Qingshan waved goodbye, Jianggang and Baosteel, who were in a sweet love period, were far and near.

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

First Prize of the Ministry of Metallurgy, Yangtze River Daily, Jianggang Advanced Individual, Baosteel Distinguished Technical Consultant, Chuzhou Provincial May Day Labor Medal Candidate...... When Zhao Qingshan, who has gained a lot of personal honors, returned to the 945 steel research group, the attitude of his colleagues changed significantly.

"Xiao Zhao is very beautiful. Zhang Tongqiao is envious.

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

"Just by virtue of a niche scientific and technological innovation, you have won so many honors, if it is popular, a wide range of scientific and technological achievements, tsk...... By the way, Xiao Zhao, the chemical composition of 945 steel less than or equal to 16 mm non-quenched and tempered state test plate has been preliminarily determined, oh, this is it. ”

On that day, Zhao Qingshan reminded Zhang Tongqiao of "so, so, so, so", and in a blink of an eye, in mid-April, the chemical composition of the 945 steel breadboard was finally preliminarily 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 has been obtained through a large number of tests by Zhao Qingshan, Zhang Tongqiao, Liang Minfang, Liu Yahui and other technicians, and several furnaces of test plates have been smelted and rolled.

Zhao Qingshan asked: "I'm sorry, due to other work arrangements these days, I haven't come to the trial production workshop much, what about the performance test data of these furnace breadboards?"

"The seawater corrosion-resistant test board was sent to the laboratory of the Naval Engineering College, and they were commissioned to do seawater corrosion resistance experiments, but the results did not come out so quickly. Additional performance test data can be found here. Liang Minfang patted a stack of papers on the table.

Zhao Qingshan flipped through the documents: "The yield strength is 440MPa, the tensile strength is 500MPa, the elongation is 20%, and the impact absorption work is 32J...... The data is unsatisfactory, doing the ferry is so-so, and the warship is so-so. ”

The use of 945 steel is the main structural steel of the 052 first ship, and the military representative mentioned a bunch of performance indicators.

From service to decommissioning, warships take the sea as their home, and the steel plate of the warship must have good seawater corrosion resistance. In the process of building a warship, it is necessary to complete a series of processing procedures such as welding, water-fire bending, and pyrotechnic correction, so as to ensure the stability and reliability of the warship and achieve the military goal of "killing a few more enemy ships and letting them be buried at the bottom of the sea." This puts forward high requirements for the performance of 945 steel.

Colonel Yu clearly put forward 18 performance indicators, any of which are unqualified and cannot be supplied to the shipyard. Our 945 steel breadboards have some non-conformities, which is to be expected. According to the big plan of the research group, on May 4, some elements must be refined at 1.7 meters, such as boron. Zhao Qingshan talked about his opinions.

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

Boron is chemically active and can easily combine with oxygen and nitrogen in steel, causing boron to lose its effect. Precise control of the boron content and uniform distribution in the steel is a challenge.

Jianggang's practice is to add alloys such as aluminum and zirconium to fully deoxidize and add titanium alloys to fully fix nitrogen, and then add ferroboron or boron-containing core-clad wire for boron alloying in the middle and late stages of refining outside the RH furnace, so as to consume precious metal titanium to ensure the yield of boron.

As of April 87, there were only 5 RH furnaces in China, 3 of which were in the Machinery Factory of the Ministry of Mechanical and Electrical Engineering, and the remaining two RH furnaces, one each of Jianggang and Baosteel.

The equipment of the trial production workshop does not have the conditions for refining outside the furnace, and the only RH furnace in Jianggang is in the steelmaking workshop of the second steelmaking plant.

Zhao Qingshan solicited everyone's opinions: "Steel enterprises are really too dependent on advanced equipment, because of the limitations of the equipment, our test tasks in the trial workshop can basically only be done to this extent, there are still 20 days from May 4, we check and fill in the gaps, sort out the test data?"