The industry is based on steel.

Just after the New Year of '51, the "steel group" composed of 10 metallurgical engineers and 20 mechanical engineers and 20 security personnel was stationed in Ansan Iron and Steel Company with laptops under the leadership of a postdoctoral fellow in metallurgy at the doctoral workstation of the Blue Sky Aircraft Repair Plant. Together with the Northeast People's Republic of China's Ministry of Heavy Industry and the engineering and technical personnel of Ansan Iron and Steel Company, the "Ansan Iron and Steel Company Transformation Headquarters" was established

The main body of the predecessor of Angang was Showa Steel in the pseudo-period, and the production capacity at that time was the second in Asia, second only to the Yawata Iron Works in Kyushu, which was the new iron in the later generations.

Angang's No. 1, No. 2, No. 4, and No. 9 blast furnaces were built by extracting the blood and sweat of the Chinese. On April 29, 1919, the No. 1 blast furnace was officially ignited for production, and the plundering of Ansan's mineral resources began. On December 16, 1921, the No. 2 blast furnace was ignited for production. Later, on May 7, 1937 and November 28, 1943, the No. 4 and No. 9 blast furnaces were completed and put into operation one after another. The four blast furnaces are all tank blast furnaces, with a total volume of 2944.85 cubic meters and an annual design production capacity of 2.35 million tons. Then it was sacked by the Soviets. The Soviets snatched most of the key equipment, and then after more than three years of "inspection and fishing" by the Chinese people, the main equipment and mechanical and electrical equipment of the four blast furnaces were almost completely lost, the furnace platform was overgrown with weeds, and the blast furnace became a ruin. After the liberation of Ansan, the Party Central Committee ranked the restoration and development of Anshan Iron and Steel in the first place in the country's economic construction, and quickly resumed iron-making production. A huge campaign to donate equipment and resume production began, and some workers handed over the stolen equipment and parts to the factory. In just half a year, Angang repaired the No. 2 blast furnace. On June 27, 1949, the No. 2 blast furnace flowed out of the first furnace of the Chinese working class after the liberation, and on September 7 of the same year, the No. 1 blast furnace resumed production. On January 29, 1950, the No. 4 blast furnace also resumed production.

After arriving at Angang, the "steel group" of the base was immediately divided into four groups to investigate some of the original iron and steel enterprises and formulate transformation plans.

The first group was stationed at Ansan Iron and Steel Company and formulated a renovation plan for the No. 1, 2, 4 and 9 blast furnaces. According to the existing conditions, in the overall layout, they achieve the overall optimization of technology and economy, and achieve low overall investment, low operating costs, fast results and high output. This principle, first of all, they all adopted the four blast furnaces, in the 60s, the more advanced automatic charging system and perfect testing instruments and other equipment for this kind of small and medium-sized blast furnace in later generations, they proposed to directly use the 21st century blast furnace coal injection is iron-making technology, the use of blast furnace coal injection is iron-making technology, not only to greatly reduce the blast furnace coke ratio, pig iron cost to drop significantly, but also may become an effective means of adjusting the furnace condition heat system, enhance the reduction ability of gas, develop indirect reduction, and improve the working state of the furnaceIt also creates conditions for the blast furnace to use high air temperature, and improves the utilization coefficient of the blast furnace and increases the iron output under the premise of ensuring the coal injection per ton of iron.

Some engineers and technicians of the Ansan Iron and Steel Company, including some experts from the Ministry of Heavy Industry of the Northeast People's Government, were shocked by the transformation plan proposed by the "steel group" of the base. It's also too whimsical. Their biggest question for these military experts, who are protected by armed men at all times, is: "Can this work?"

After a year of transformation, on October 15, 1951, the No. 9 blast furnace after the transformation was smelted by high-pressure technology, and the coal injection system was put into operation, with an iron production of about 2,500 tons, and an average coal ratio of about 120 kilograms. All kinds of technical skills are far ahead of countries in the world, and iron training technology is in the absolute leading position in the world.

Some engineers and technicians of the Ansan Iron and Steel Company and some experts from the Ministry of Heavy Industry of the Northeast People's Republic of China have solved their doubts: "It turns out that iron can still be refined like this!" They admired these military experts even more. These people and "outsiders" do not speak much, work efficiently and very efficiently, and after some plans are proposed, they quickly come up with neat, clear, and accurate drawings of various sizes. They are puzzled. O man of God! The "Iron and Steel Group" of the base plans to build a large blast furnace of 3,200 cubic meters and a blast furnace of 2,580 cubic meters within five years, so that the annual output of iron will reach 5 million tons, and the annual iron output of the entire Angang will reach 8.6 million tons. They are now convinced that this is never a dream. Through a year of work with these military experts, they learned a lot of new knowledge and new ideas, broadened their horizons, and laid the foundation for becoming world-class metallurgical experts in the future.

Following the completion of the transformation of No. 1, No. 4, No. 2 and No. 9 blast furnaces in a row of Angang blast furnace group.

The renovation of Ansan No. 1 Steel Plant, a subsidiary of Showa Steel Co., Ltd., is also coming to an end, with a design capacity of 30,000 tons of steel and 60,000 tons of rails per year. Ansan No. 1 Steelmaking Plant, like all enterprises, was also pulled away by the Soviets, and some of the remaining equipment was also dismantled by the workers to change porridge and drink. You can't blame the workers, who are proletarians. Nothing but their own hands and labor skills. They live on wages. From the beginning of '45 to the beginning of '49, the entire factory was abandoned, no one managed it, no one made money, and it could only be relied on. Rely on the factory to eat the factory. After the liberation, after repeated mobilization, the workers were educated to take out the equipment that was "taken away", and the parts were returned to the factory, and the factory was re-employed, so that the factory that was originally full of devastation was partially restored. In order to increase the furnace temperature, a regenerative chamber was established to preheat the gaseous fuel, and 30% oxygen-rich air blast was added to the open-hearth furnace, and oxygen was blown into the molten metal at the same time, which can increase productivity by 80%, shorten the smelting time by 2~4 hours, and save fuel, and oxygen-rich air does not need to be preheated. The output has more than doubled, reaching an annual output of more than 200,000 tons of steel.

The largest project they carried out was the construction of three 80-ton converters. In this era, the world does not know what converter steelmaking method is. Not to mention the converter used in steelmaking. In the converter steelmaking method, the oxidizing agent used is oxygen, which blows air into the molten pig iron to oxidize impurities such as silicon and manganese. A large amount of heat is released during the oxidation process, and 1% silicon can increase the temperature of pig iron by 200 degrees Celsius, which can make the furnace reach a high enough temperature. Therefore, converter steelmaking does not require additional fuel. Converter steelmaking is carried out in a converter.

The workers of Ansan No. 1 Steelmaking Plant looked at these three behemoths that looked like pears, and finally understood that these three big pears were called converters, the inner walls were inlaid with refractory bricks, and there were many small air outlets on the side of the furnace, and the compressed air blew into the furnace from these small holes, making the molten steel boil violently. When brown steam of ferric oxide appears at the mouth of the furnace, it indicates that the steel has been refined. At this time, the blast should be stopped immediately, and the converter should be turned to a horizontal position, the molten steel should be poured into the molten steel ladle, and then the deoxidizer should be added for deoxidation. The whole process only takes about 15 minutes." It's so cleverly designed! Master Li, you say, how did you come up with these eight paths?" People are experts! Can you not think of it. But this 15 minutes of a furnace of steel, it's really fast. How much steel has to be poured out this year!"

Another young worker was counting with his fingers crossed. Four furnaces in an hour, eight hours in a shift. Three shifts a day. That day"

Master Li gently patted the young worker's head and said, "Okay, you kid just wrench your toes and toes, and you can't count it. Let's go, let's get to work."

Due to the fact that the oxygen production technology was not yet developed at that time, the "steel group" of the base did not adopt the oxygen top blowing converter that was widely used in later generations. This converter is blown into high-pressure industrial pure oxygen, which reacts more violently and can further improve the production efficiency and steel quality. The base steel group, in order to further dephosphorize, remove inclusions, and improve purity. They adopted a single-blown granular magnesia molten iron desulfurization facility, and the equipment and technology of an on-line desulfurization reactor and an on-line continuous slag scraper were used to carry out continuous desulfurization treatment of molten iron in the blast furnace molten iron trench. The application of this process technology can reduce the burden of the blast furnace and converter, and obtain excellent results. China's steelmaking technology and technology have been ahead of the world for fifteen years, and some technologies are even thirty or forty years. In order to improve the output and quality and labor productivity, they also adopted continuous casting technology and installed 3 eight-rate billet continuous casting machines. The design capacity of a single casting machine is 600,000 tons, of course, the manufacturing of all these key components is inseparable from the CNC overtime center of the base repair shop.

The other two teams renovated the pipeline pulling line of Ansan Seamless Pipe Factory, formerly known as Mangang Steel Pipe Co., Ltd., so that the annual output of welded pipes and seamless pipes was 70,000 tons, doubling

At the same time, they can transform several production lines of Ansan Special Steel Plant and former Sumitomo Steel Pipe Co., Ltd. with an annual output of 40,000 tons of steel pipes for weapons, and at the same time, they have put on two pulling lines. The output reached 100,000 tons. What's more, two electric arc electric furnaces were installed in Ansan Special Steel Plant. The use of electric furnace steelmaking can make high-quality alloy steel to meet the special needs of military production.

They used the former Manchuria Steel Roller Factory to build and benefit the Ansan Tractor Casting Factory, and installed two 50-ton electric furnaces and continuous casting machines for the production of tanks.

There is also a bright spot in Angang, piling up all kinds of waste guns and rotten guns pulled back from North Korea, around the scrapped cars and tanks, there is a group of people under the leadership of the old worker Meng Tai, who dismantle every usable part and put it away in different categories. Even if it's a screw. so that they can be used where they are most useful.

The rise of China has started a difficult start here!