.Under Xu Fan's strong push, Imperial Military Industry has been developing automatic torpedo loading equipment.

At present, the Empire has developed an experimental automatic loading facility, completing the first volley's launch tube rotation and the secondary loading device, and loading preparatory torpedoes into the launch tube with an electric conveyor belt. However, this automatic loading device is more fragile. Once the warship suffers a severe blow, it may be misaligned and has to be repaired or loaded by manpower. Moreover, the technology is very immature, and it is even more fragile when used on the deck.

As a phased idea, the latest light patrol and destroyers of the Chinese army moved the torpedo tube toward the swelling and arranged the torpedo warehouse in the middle of the chimney for easy loading. They also used electric missile lifting machines, so sailors could directly transport the torpedo to the loading port of the torpedo tube to load the bullets. After hard training, the Huajun loader has now shortened the reloading time of torpedo to only two minutes.

Previously, the Takapan was actually dying under the concentrated attacks of the Cheetah and the Snow Leopard. The superstructure was in full swing and there were very few turrets that could open fire. In a critical moment, except for the two that survived the torpedo attack, the four Japanese destroyers that had survived the torpedo attack were crushed by the fierce artillery fire of the Chinese army when they retreated, the remaining Takapan and the Takagi had rushed over to try to cover the Takapan to escape the disaster.

The Chinese guerrilla troops faced the situation where Changban, Suzuki and Chaomu were chasing each other in front, and adopted an extremely brave breakthrough tactic, rushing directly to the Changban, firing while advancing, and striving to suppress the firepower of Suzuki and Chaomu. The 152 main guns of the Hua army's Saber, the Big Sword and the Saber were obviously powerful, and the firepower of the Saber and Chaomu could not be suppressed at all. Instead, they were beaten to a bruised face, and the firepower soon ignited, and the firepower was reduced.

The Chinese army braved the firepower of the Asama and the Changpan torpedo attacks in a direction of 1,200 yards. The Changpan, who had lost power, watched the destruction approach, but saw the burning Speedbird and Chaowu blocking their bodies in front, each of them being hit by the torpedo, and sank into the bottom of the sea almost in the blink of an eye.

The Changpan still did not escape the disaster. Three torpedoes rushed to hit the armored cruiser. This time, the Chinese army was surprisingly lucky and all of them successfully exploded. The armored cruiser disappeared on the surface of the East China Sea and turned into a pile of scrap iron on the bottom of the sea.

On the Saber, Xu Bo, the commander of the guerrilla force who had transferred over, put down the telescope in his hand and sighed: "The Japanese Navy is also a very tenacious warrior... Unfortunately, in the face of the power of the Imperial Mobile Fleet, all efforts were just futile struggles."

Xie Jiangchao's face was particularly excited. He forced himself to suppress his inner joy and said confidently: "Old Xu, the guerrillas have made contributions this time... We have sunk two equipped patrols, four protective cruisers, and two destroyers. If we can get rid of the Changlu and Izumo..."

"No, we go north," Xu Bo shook his head, "The final key to this battle is the survival of the main patrol column. Now the warship status of the main column is very dangerous.

, If we lose more than two ships of the patrol, our strategic benefits will be very small in this battle. Now our team is in equal force, and if we rush over first, we can have a clear advantage. The Changlu is already a fish on the board. As for Izumo, let it chase slowly... Send a report to the commander and the guerrillas request to return to the main column immediately."

Colonel Yoshimatsu Shigetaro on Yakumo has no hope for victory.

The Cheetah and Snow Leopard of the Chinese Army were like two lions with iron bones. Although the Japanese army had loaded up the gunpowder of Shise and had grenades from the Ijiyuan Information Pipe to break the superstructure of the two warships into a sea of ​​fire. Even the Chinese army was well-trained and known as the number one in Asia, the loss tube troops were helpless in the face of the burning flames on the deck and bridges, but the main guns of the two warships were still firing firmly, and the accuracy was not affected at all. The capitals of the two warships were already in scattered, but they were concentrated in the key points of the swollen turbines, boilers, fuel, ammunition depots and command towers, and were still unscathed under the protection of thick armor.

The Cheetah-level is an outstanding crystallization of Chinese military shipbuilding technology.

Learning from a series of experiences and lessons from the previous Hanoi-class battleships, Guilin-class equipment patrols, and the solemn modified Wenzhou-class battleships designed and built by China by the United Kingdom, the Chinese army achieved a perfect combination of new technologies and new concepts and real technical and technological conditions at the Cheetah class.

In addition to the perfect ship type obtained by using high-power steam turbines and oil-fired boilers, as well as the sink experiment, the most prominent feature of the Cheetah-class is its complex and sturdy defense system.

The total weight of the cheetah-level armor reached as much as 6,800 tons. All of them were made of domestic special steels, which were introduced into the Imperial Special Steel Department. After introducing the complete set of German Krupp armored steel, it further added other metal components to improve performance.

This is the highest crystallization of Zhengying Group's industrialization efforts over 30 years.

According to Zheng Ying and several of his students' understanding of the second industrial **, the second industrial ** is roughly divided into two major stages. The first stage is the coal-steel era, and the second stage is the oil stage.

Based on this understanding, metallurgy was placed at the top of the imperial industrial development from the very beginning and was always regarded as a core foundation. Zheng Ying's thoughts were more thorough pragmatic and firmly pursued the use of the use. Since 1873, Zheng Ying purchased the Martin Punch Furnace through the Hong Kong Central Bank and hired foreign technicians to experimentally smelter steel in northern Annan to build agricultural tools and various instruments. After years of development, when the Zhenguo Army completed its journey north, the metallurgical industry of the Chinese Empire had already had a considerable foundation.

After 1880, in addition to using the Jewish Autonomous Region and the Restoration Agreement to absorb a large number of European Jewish professionals into the industrial and technological system of the Chinese Empire, the Zhenguo Army also hired experts from various countries for huge sums of money. As long as they have real talents and are urgently needed, they will be employed at three or even ten times the price.

The development of special steel started at the same time as the military industry. The early smelting of special steel was mainly cannon steel. Speaking of this, we have to mention Mu Tie and Chen Lei.

Chen Lei's parents were originally

The employees of the state-owned machine tool factory were in a slump after the reform and opening up. Chen Lei's parents were laid off and started a small business. However, Chen Lei firmly remembered some basic information of the machine tool industry, such as the basic materials and general process routes of high-speed steel for lathes, as well as some basic knowledge of mechanical automatic machine tools, which played an extremely important role in the development of the Imperial military industry and special steel.

The research on gun steel, marine structural steel, and armored steel is also due to another crosser, Mu Tie. Mu Tie himself is an avid German fan. He knows the data about the flagship German giant ships in World War I, especially German tanks and attack ships during World War II, Bismarck and other data. He can basically explain the performance, composition and even the general process of German Krupp steel armor, warship structural steel, and various special steels.

These knowledge reserves beyond time and space played a crucial role in the metallurgical industry of the Chinese Empire. Relying on the accumulation of the special steel industry in the past twenty years, when the Chinese Empire exchanged the complete set of technical processes of Germany to Krupp armored steel from the United Kingdom with a complete set of technical processes of 40-fold diameter 12-inch steel wire fastening main gun from the United Kingdom, it quickly understood most of the process flows inside, and compared them with the metallurgical theory, process theory, and metallurgical additive system they own to develop its own set of things.

Compared with Krupp, the nickel-chromium-manganese alloy steels from the United States and France, the Chinese Empire's metallurgical technology has a unique leading position: it took the lead in solving the problem of tempering brittleness.

Tempering brittleness will cause the steel to be hot brittle, easily broken, poor ductility and elasticity. Its harm is not only reflected in the repeated quenching-tempering of steel before leaving the factory, but also in the tempering caused by medium and high-temperature explosion. Because the tempering brittleness is irreversible, steel that has tempering brittleness cannot eliminate tempering brittleness through requenching and tempering, it has become one of the biggest problems affecting the performance of steel.

Although in 1900, Britain and Germany successively discovered the tempering brittle phenomenon of alloy structural steel (mainly plates), and German engineers began to improve the process and mastered the process route of rapid cooling after tempering to improve ductility, the Chinese Empire had already adopted another method known after 1925, especially after the 1950s, people had a deep understanding of the tempering brittle mechanism: grain boundary segregation of impurity elements such as phosphorus and tin, and the nickel-chromium-manganese in alloy steel will further lead to the surface enrichment of these impurity elements, leading to the brittlement of steel, and also known that molybdenum and titanium can promote impurity precipitation, thereby basically solving the tempering brittle problem.

Therefore, the special steel department of the Chinese Empire took corresponding measures very early: adding molybdenum, followed by the use of vanadium titanium magnetite.

Molybdenum metal was extracted as early as the 18th century, but its use in the metallurgy industry has never been correctly understood, resulting in the mining of molybdenum ore very lagging. In another time and space, the first molybdenum ore in the Kingdom of Norway, the Knerben deposit, began to be mined in 1885, but because the demand was too small, the mining was intermittent. Before World War I, the global molybdenum output was only 100 tons.

With the help of the knowledge accumulation of time travelers, the Chinese Empire not only directly acquired the poorly managed molybdenum ore in Norway and invested in expanding production capacity, but also began to explore large mines with a certain range since 1880. The result made Zheng Ying and others ecstatic, because large-scale molybdenum-nickel symbiotic ore were discovered in several major non-ferrous metal-rich areas in Zunyi, Yunnan, and western Hunan, and the taste could reach 5.

In addition, vanadium titanium metal can greatly improve the strength of steel, which is the so-called secondary hardening and improve corrosion resistance. In the 21st century in another time and space, China, as the world's largest country in vanadium titanium magnetite, used vanadium titanium magnetite ore to produce high-performance marine alloy steel. Chen Lei, Mu Tie and Xu Fan are all aware of this, and naturally they will not let go of China's most famous vanadium titanium magnetite ores: Panzhihua and Chengde.

Long before the Chinese Empire unified the country, the Chinese Empire's exploration team composed of Jews and Chinese had already explored and tested the production of several key mining areas in the north under the banner of foreign trade companies. This included the Luanchuan Molybdenum Mine, Asia's largest molybdenum ore (mainly Xu Fan's father did molybdenum export trade), the world's second largest sulfur nickel ore in Jinchang City, Gansu, and several giant chromium ore in Tibet.

Speaking of chromium mines, the origin of the story is a bit funny. In addition to Mu Tie being familiar with this aspect, it also comes from Zheng Ying’s low salary. In order to earn some extra money to support his family, Xu Fan’s father often speculates on stocks. Xu Fan’s father also had a lot of information about metal trade, and the two often discussed together. In 2009, Zheng Ying thought that the opportunity had come, so he speculated with Xu Fan a famous stock: Tibet Mining, which really made a lot of money in the bull market in 2009 (later, a few people went to Tibet for self-driving trips, and actually had the intention of fulfilling their wishes).

Tibet's chromium ore reserves account for 40% of the country. In order to speculate on this stock, Zheng Ying and his proud student have read many information and are even more familiar with the chromium ore he owns.

With the help of the ancient tea-horse road in Yunnan-Tibet, the salt tea trade controlled by the Zhenguo Army, the Zhenguo Army's mining team began exploration in Tibet early and then mining. However, the transportation of this thing has always been a big problem, so it has basically become a process base for refining and extraction. The chromium ore used in the military industry is mainly imported from Turkey and the United States on the east coast. It was not until the Empire discovered a huge chromite in the Western Philippines in 1902 that it gradually began to be self-sufficient.

In terms of vanadium titanium magnetite, the exploration and trial production of Panzhihua began very early, but due to transportation issues, its vanadium titanium magnetite did not start to be mined and refined on a certain scale until 1898. The vanadium titanium magnetite in Chengde is more convenient to transport, and it was roughly industrialized production in 1900.

China has rich manganese ore reserves, with a large number of manganese ore deposits all over Guangxi, Hunan, Sichuan, Guizhou and East China.

Starting from the War Knife-level Light Cruise and the Cheetah-level Rapid Armored Ship, the imperial marine steels used almost all of the domestic vanadium titanium magnet ore, and added molybdenum nickel chromium manganese materials. The element ratio should be adjusted according to the performance requirements of various steels.

There are five major series of different steels, including tool steel, special structural steel, general steel, stainless steel, etc.

At the cheetah level, the Chinese Empire mainly used four types of steel:

The first type is ordinary marine structural steel. This steel requires strength and toughness, but the hardness requirements are not that high. Currently, the improved Ship-3 structural steel is used, which is a low-carbon and high-manganese high-strength tempered hardening steel. According to comparison tests, due to the reference to the process technology of Krupp armored steel and the addition of nickel-molybdenum metal to the steel, the toughness and high temperature oxidation resistance are improved, and the use of vanadium titanium magnet ore greatly improves the hardness and corrosion resistance, the performance of No. 3 structural steel is already at the leading level. With the further improvement and improvement of the process, there is still a lot of room.

The second type is high-strength carburized armored steel, numbered A-2 carburized armored steel. This is just the Chinese version of Krupp's armored steel. It uses vanadium-titanium magnetite ore based on German products, and has adjusted accordingly in the production process. At the same time, the addition of molybdenum metal to improve ductility and improve tempering brittleness. Although the process is still climbing, due to the excellent material, the comprehensive performance has surpassed the original German products. However, in addition to the process, production capacity is also a problem. Due to the lag in production capacity and the demand for military industry has soared in recent years, the Imperial military industry has still imported a large number of special steels from Britain, the United States, Germany and France for use.

The third type is high-strength homogeneous alloy steel. The current product number is B-1. It was developed based on the German Krupp armored steel. It is mainly used in the ship's compartment armor. It has high comprehensive requirements for elasticity and strength, and is very different in additive formula than high-strength carburized armored steel.

The fourth type is high elastic homogeneous steel, which is also a rolled alloy steel plate, but has higher elastic requirements. It is mainly used for lightning protection and impact protection partitions under the waterline, strengthening ribs, and focusing on improving the protection of the hull keel structure. Its tolerance for elastic deformation is as high as 23, and currently numbered C No. 1.

These four types of steel are used in combination at the Cheetah level and Guangzhou level.

At the waterline position of the armor box with a length of 60% of the warships, the Cheetah-class is equipped with a thickness of 240 mm, and all uses Imperial A-2 high-strength carburized armor steel. The upper side armor is 50 mm carburized armor steel. The stern waterline armor and the head waterline armor are equipped with 60 mm high-strength homogeneous armor steel.

In the horizontal direction, in addition to the upper deck of 60 mm B-1 high-strength homogeneous armored steel, the Cheetah class also installed two other layers of horizontal armored plates below, all of which were Imperial B-1 high-strength homogeneous steel, and were used as watertight partitions. The thickness of the second layer of the main horizontal armored plate was as high as fifty (not critical) and eighty ( critical) mm, and the thickness of the final bottom horizontal armored plate reached forty mm. In addition, thirty mm of C-1 high-strength homogeneous armored steel was also installed at the bottom and sides of the ammunition depot.

Inside the cheetah-class, the horizontal armor plate in the head of the armor box is 100 mm thick and the tail thickness is 60 mm. All of them are made of No. 1 material, and all of them are made of No. 3 structural steel in the longitudinal watertight partition.

, thirty mm thick.

In terms of superstructure, the thickness of the No. 2 armored steel plate on the front of the Cheetah-class commander tower reached 280 mm. On the front of the main turret, the No. 2 armored steel with a thickness of 220 mm was installed, with 150 mm on the side, 160 mm on the top and 180 mm on the back.

The Cheetah-class designed complex lightning protection compartments under the side armor belt. The lightning protection compartments are mainly divided into three compartments: dry compartments, liquid compartments, and empty compartments.

On the outermost layer of the lightning protection compartment, the dry compartment protruded from the hull is the dry compartment, and its outermost layer is 40 mm Armored Steel No. 1 armored steel, and then the empty compartment reinforced with reinforced structural steel, mainly absorbing impact energy; then the 120 mm thick No. 1 armored steel connected to the main armor belt extends downwards to the bottom of the ship and is connected to the No. 1 high elastic steel plate with a thickness of 30 mm...

More to, address
Chapter completed!