After listening to Yang Haifeng's introduction, Jin Hanlin looked at Shen Huan again, and said in a deep voice: "One of the most critical points is the manufacture of insulated boxes, more than 50,000, your technological innovation center, we must vigorously cooperate with Wu Dongzhonghua, do our best to solve this problem, and achieve complete localization, Comrade Shen Huan, is there a problem?"
” Shen Huan hurriedly said: "No problem, I think so, we can join forces with our China Shipping Jiaotong University, and we will jointly tackle key problems with the three parties to win the problem of rapid production of LNG ship insulated boxes.
Of course, tackling key problems also requires a certain amount of time and investment. ” Jin Hanlin nodded and said: "I completely agree, now we Wu Dongzhong from abroad to introduce the insulated box production line, through the previous stage of trial production, the product quality is not bad, but then we must strive to obtain the GTT company, the United States classification society and the shipowner of the approval, the next step we will also achieve the complete localization of ultra-low temperature insulated box, only the core technology mastered, we can really win the LNG ship this shipbuilding industry crown jewel, we must work together, Strive to achieve this goal as soon as possible!
” After listening to the words of the helmsman of China Shipbuilding Industry, everyone present seemed to have a blood surging in their hearts!
It will take time to truly realize the localization of key equipment on LNG ships!
After all, these are high-tech products, and now it is not easy to produce LNG ships through introduction, and it is really not easy to break the foreign technology monopoly.
In particular, the ultra-low temperature insulated box is known as one of the core components of LNG ships, and only a few companies in the world have mastered the manufacturing technology of this ultra-low temperature insulated box.
To ensure that the LNG is not gasified, the temperature in the cargo tank must be controlled below minus 163 degrees, and at the same time, it is necessary to ensure that the hull will not be affected by this ultra-low temperature.
What can do all this is the ultra-low temperature insulated box.
The manufacturing technology of ultra-low temperature insulated box is indeed a huge problem for China's shipbuilding industry.
If the problem of in-house manufacturing is not solved, the construction cost of LNG carriers will be very high.
Moreover, there is more than one type of insulated box on LNG ships, so how big this technical problem is, Shen Huan, as a reborn, is very clear.
In order to realize the manufacturing process, quality control and pulsating production of ultra-low temperature insulated boxes, there are a lot of technologies involved, and it is necessary to find the cooperation of automatic processing and design manufacturers of pulsating production lines in China, so as to realize the localization of production equipment as much as possible, so that the cost can be greatly reduced, and will not be subject to foreign manufacturers.
The manufacturing accuracy of ultra-low temperature insulated boxes is quite high, so even foreign companies that have mastered this technology will produce a lot of inferior products and waste products, resulting in high production costs, and how to reduce the defective rate is also very critical and the most difficult.
In terms of the production of ultra-low temperature insulated box materials, whether it is wood or pearl powder, domestic materials are not up to the requirements, which is also a difficult problem that needs to be solved, if the localization of raw materials is not solved, it is also easy to be controlled by others.
Of course, in the real realization of independent construction of LNG carriers, it is not only the problem of insulated box manufacturing that needs to be overcome, but also many problems that need to be overcome one by one.
For example, the delicate Yin tile steel, this material also has to be imported from abroad.
The price of Yin tile steel is also quite expensive, although its thickness is only 0.7 millimeters, but its price, a kilogram will cost more than 100 yuan, more than 100,000 yuan per ton, converted into US dollars is about 20 US dollars a kilogram, 20,000 US dollars a ton, dozens of times more expensive than ordinary steel!
The construction of an LNG ship of more than 100,000 cubic meters requires about four or five hundred tons of Yin tile steel, which is converted into RMB and worth more than 50 million.
In order to reduce the construction cost of LNG carriers, the localization of Yinwa Steel is also a must to be done.
Otherwise, most of the money will be made by foreign companies to build an LNG ship.
Yin tile steel, this special material, only one company in the world can produce!
It is also one of the most demanded materials for thin-film LNG carriers.
What is the difficulty in developing and producing Yin tile steel?
It is an extremely difficult alloy to make, and it is the only alloy steel with almost no cold rise and shrinkage effect, so it is best suited for liquefied gas transport and storage.
In Shen Huan's memory, it was not until 2017, that is, 12 years later, that Zhonghai Baogang Special Steel Co., Ltd. finally successfully developed the domestic Yinwa Steel, becoming the second enterprise in the world that can produce and supply thin-film LNG marine Yinwa alloys, completely breaking the foreign monopoly.
It is not only quite difficult to solve the problem of localized Yin tile steel, but also the technical difficulty when welding this alloy steel.
Because Yin tile steel comes into contact with water or oil at room temperature, it will rust in a few hours, and because its thickness is only 0.7 millimeters, it will cause the entire steel plate to be scrapped.
Therefore, when welding the LNG ship cargo tank, the site must also be equipped with air conditioning with dehumidification function to maintain the dryness of the cabin.
You must know that LNG ships carry very dangerous LNG, so once there is a problem with the welding quality and leakage, more than 100,000 cubic meters of LNG will explode, and the power is unimaginable.
Therefore, the welding work is also very demanding.
In the history of LNG ships, there has never been a leakage accident, so China's shipbuilding industry must not be careless when building LNG ships!
When welding the LNG cargo hold enclosure system, the welder and the welder are even locked one by one, and before the official start of welding every day, all the welders must be in the inspection room, first test welding, and only after passing can the formal welding begin.
The cargo hold enclosure system of LNG ships is a huge project, which has four layers, two layers of insulated boxes, and two layers of intile steel in between.
The whole system has more than 50,000 insulated boxes, four or five hundred tons of Yin tile steel, and 300,000 parts, just the scaffolding during construction, there are tens of thousands of parts, weighing more than 1,000 tons.
It is precisely because LNG carriers are so difficult to build that there are so few shipyards in the world that can build LNG ships!
And now, Wu Dong-Zhonghua Shipyard is about to break the history of China's inability to build LNG ships.
And the work of localizing key equipment is also gradually unfolding!
With the support of the Technology Innovation Center of China Shipbuilding Industry Group Engineering Research Institute and other units, the Wudong-Zhonghua LNG ship project is in full swing!