After watching for a while, Wang Bin withdrew from the system and returned to the store, because he found that it was not a simple thing to smelt this bearing steel. Smelting this bearing steel requires not only professional special steel smelting equipment.

    At the same time, in terms of raw materials, it also contains a variety of rare metals and non-metallic materials. Therefore, if you want to smelt this bearing steel, you must have these raw materials. For example, rhenium metal is one of them.

    In real society, these metals belong to the existence of strategic metal materials. Even if Wang Bin and 969 group have some relations, it is even more difficult to obtain some rhenium metals, let alone long-term and stable supply.

    "It seems that if the source of strategic metal raw materials such as stable rhenium metal cannot be obtained, this bearing steel can only be produced in a small amount. It is basically impossible to carry out large-scale production.

    However, according to the knowledge in my mind, it is not difficult to develop an excellent bearing steel with slightly inferior performance and independent of rare strategic metal materials on the basis of this bearing steel. "Wang Bin thought secretly.

    Then Wang Bin thought again! Donald mentioned to him before that he has purchased various minerals and raw materials in the technology mall. I don''t know whether he can buy raw materials and minerals from the system now.

    So he asked the system, "system, I wonder if I can buy raw materials for the production of basic materials and various ores from the system now, such as iron, copper, aluminum, magnesium, etc."

    "Sorry host, because your current level permission of the science and technology mall is too low, you can''t buy raw materials and minerals. The minimum permission of the science and technology mall to buy Minerals needs level 2, but you only have level 1!" said the system.

    "How can I upgrade the permissions of the science and technology mall to level 2?" after listening to the system, Wang Bin was a little angry. After all, he had obtained the system for nearly a quarter, but for such a long time, he is still level 1, and even the conditions required for upgrading are not clear, so he thought it was time to understand and actively prepare to design the permissions of the science and technology mall.

    "Hello host! The first condition for upgrading is that the total transaction volume in the mall reaches 5000 energy coins. Condition 2: the host must purchase more than three basic technologies from the mall and realize them in the real world, that is, the host''s world. Condition 3: the host must use the technologies obtained from the system to have an impact on the scientific and technological process of the host''s own world The impact of setting.

    So far, you haven''t completed the above conditions, so the host can''t upgrade the permissions of the technology mall yet, "the system said.

    After listening to the words of the system, Wang Bin was silent. It''s OK to say about energy coins. After all, his total transaction volume in the mall has reached 8900 energy coins. With the passage of time, it''s not difficult to achieve this transaction volume. At the same time, it''s not difficult to buy more than three kinds of calculations from the system. As long as there is energy coin technology, it''s easy to buy it.

    Now the most difficult thing is the real thing. According to the system, he must have some impact on the overall science and technology of his civilization.

    Now, although Tiangong technology has begun to produce special glass, its scale is still very limited, so it has no impact on the scientific and technological process of the whole human civilization, even on the country where it is now.

    So what he needs to do next is to speed up the construction of the production line and start the large-scale production of this special glass as soon as possible. At the same time, the bearing steel technology he has just purchased from the system must be realized and mass produced as soon as possible.

    In addition, with the large-scale production of their sky technology special glass, the customers of these stores in his technology mall can not only be Donald and Xu Zhenming, but also need more customers. Only in this way can he trade with more people and obtain more energy coins.

    Wang Bin has also expected that not only this upgrade, but also the energy coin technology and its impact on the real society. At the same time, the upgrading of the whole line of the science and technology mall in the future also has requirements in these aspects.

    Thinking of this, the system said to the system, "system! Connect the information of our store to the technology mall, and we will continue to welcome customers."

    Because Tiangong technology''s production capacity was very limited before, Wang Bin did not continue to receive other customers after contacting Xu Zhenming and Donald. After all, in terms of the original production capacity, even tanard''s orders could not be met, let alone other customers.

    But now it''s different. Because their large-scale production line of Tiangong technology is about to be completed, it can naturally reopen.

    "Good host!" as soon as the words of the system fall, Wang Bin''s technology mall store is connected to the technology mall. At the same time, some people walking on the street will pay attention to their Tiangong technology store.

    Shortly after Wang Bin''s Tiangong technology store was connected, someone came to their store and looked at it at will.

    The person who entered Wang Bin''s Tiangong technology store is very young. According to Wang Bin''s judgment, this person is about 20 years old and wears the military uniform of the bald eagle army during World War II. It is obvious that the world in which this person lives should be about the same as that in which Wang bin lived during World War II, At the same time, the young man should be a bald eagle military man.

    "Hello! What can I do for you?" although Wang Bin doesn''t like the bald eagle in his world and doesn''t hate the bald eagle country, since he comes to the door, Wang Bin is naturally very welcome. At most, when he buys things, he can make a higher price.

    "Hello, shopkeeper. My name is Steve. Does your store only sell special glass?" Steve asked.

    "Yes! We only have special glass for sale at the moment, but although it is also special glass, our glass has very excellent performance and is the best choice for aerospace glass.

    At the same time, our glass can also be made into precision parts of various equipment, such as machine tool screw, spindle, bed, etc. "Wang Bin said!

    However, when Steve listened to Wang Bin''s words, he didn''t think so, and didn''t show any interested face. It was obvious that these glasses didn''t look good to him.

    "Of course, the performance of this glass is more than that. It not only has excellent high temperature resistance, but also has strong bulletproof performance. For example, the 6mm glass next to me can resist the direct shooting of 12.7mm heavy machine gun. If it is installed on various vehicles, it can definitely protect the of various vehicles and make the driver feel comfortable The sight of the drivers and the soldiers inside will not be blocked! "Wang Bin said again when he saw that Steve was not interested.

    "Really? This is beyond my expectation. I don''t know the shopkeeper, how defensive your glass is against energy weapons!

    During this period of time, our enemies don''t know whether they have obtained the technology of alien civilization in terms of science and technology, and there are energy weapons, so for the safety of our soldiers, I have to find some armor that can resist the shooting of energy weapons, "Steve said.