Chapter 236 Shocking Statistics
Chapter 236 Shocking Statistics
Ten minutes later, Mu Yang came to the titanium alloy factory again.
Seeing the boss coming, Long Xuan handed him a printed copy of the data. At the same time, she couldn't hide her excitement: "Boss, the data of TC4 produced by workpiece number 410 is really exaggerated, and the mechanical performance data exceeds the standard by a lot. , and the harmful elements are much lower, I can't believe it, I thought the measurement was wrong.
However, we took a total of three groups of materials as samples, and each group took four samples, and this is the case for 12 data;
As for the batch of materials we smelted, the data is relatively normal. "
After Mu Yang took the experiment report, Long Xuan explained to him that the labels had already been prepared.
For example, the plate thickness is 12 mm thick, and the performance is measured at room temperature.
The normal main mechanical performance standards (annealed heat treatment state, civil use) are: tensile strength σb/MPa≥895, elongation δ5(%)≥10;
The normal main mechanical performance standards (solid solution heat treatment state, higher requirements) are: tensile strength σb/MPa≥1100 (three times that of commonly used steel Q235B), elongation δ5(%)≥10.
Generally speaking, aerospace titanium alloys require solid solution treatment (at the same time, internal stress can be eliminated, otherwise fatigue cracks are prone to occur).
Two domestic titanium alloy manufacturers that are more powerful, the tensile strength of TC4 produced is between 1100-1250MPa, and the elongation is between 12%-20%.
However, at present, the performance is unstable and there are many impurities. High-end aerospace titanium alloys still rely on imports.
The material experiment that Mu Yang asked Long Xuan to do was through solid solution treatment.
Long Xuan's batch of materials, he looked at the experimental data, barely met the minimum requirements, slightly worse than the two domestic ones.
One set of data is low, the tensile strength is between 1010-1050MPa, the tensile strength is lower, it can be used for sure, but if it is used in aviation, it does not meet the design requirements, unless the requirements for materials are lowered.
In terms of processing performance and high temperature creep resistance, the processing speed is slow, and it is only suitable for parts that work for a long time below 400°C. When it reaches 400°C, the tensile strength drops relatively quickly, with an average of only about 801.3MPa (if the annealed state is only five to six hundred MPa about).
If the temperature reaches 800°C, the tensile strength drops sharply, with an average of only 73.2MPa, and this strength must not be used.
Compared with the group of TC4 materials debugged by Muyang, the experimental data are obviously different.
The tensile strength is between 1300-1450MPa, the elongation is between 20%-26%, and harmful elements such as hydrogen, carbon, and oxygen are much lower; the processing performance is good, and the high-temperature creep resistance is good, and it is still stable at 550°C. With a performance of 800MPa, it can work at this temperature for a long time.
When the temperature reaches 800°C, the tensile strength also drops sharply, but it still has the performance of 400MPa, which can be said to have high-temperature performance.
It's just that when the temperature reaches 1000°C, the average tensile strength is only tens of MPa. At this temperature, the material has no usable performance.
These data are better than Mu Yang expected, and the comprehensive performance has been greatly improved.
The tensile strength alone has increased by about 30%!
Elongation, the value is about double! The actual toughness is more than doubled and cannot be measured by numerical values alone.
It can be said that the overall performance is a qualitative improvement.
It is even much better than the titanium alloy of the best titanium alloy manufacturer in the world, especially the processing performance and high temperature creep resistance performance, which directly beats the international manufacturers.
Another example is the elongation rate. Generally speaking, TC4 is difficult to make shaped materials (such as L-shaped steel) because of poor plasticity;
However, Muyang's TC4 has an elongation rate of 20%-26%, which already has the basis for cold-rolled forming materials.
It's really exaggerated, no wonder Long Xuan was shocked.
"Very good, that's the same sentence, keep it secret! You should know what these data represent."
After reading the experimental data, Mu Yang returned the data to her.
"Boss, I understand what it means! Our TC4 has already stood on the highest peak in the world." Long Xuan nodded solemnly, feeling very proud inside.
Seeing her nodding, Mu Yang ordered: "Produce a few more batches and conduct more tests to see if the data is stable; if it is stable, then proceed to TA7 production, the workpiece number is 710, the same size.
At the same time, welding performance, low-cycle and high-cycle fatigue strength, isotropy, KIC, DT, residual stress and other experiments are added to test according to the performance requirements of aerospace titanium alloys for kings. "
"Okay, Boss, we haven't applied for the four certificates of Jungong. If Shangjun uses the market, we need to apply." Long Xuan mentioned a very important matter.
Even if the Xinghai Group can produce titanium alloys with superior performance, it is not so easy to enter the market for the king's use, mainly because of qualifications.
In the field of titanium alloy materials for king use, in addition to obtaining the "Four Certificates of King Industry" (National Military Standard Certification, Confidentiality Certification, License Certification, Directory Certification), manufacturers also need to carry out a lot of research and development work by participating in King Industry supporting projects , it is possible to enter the formal development stage of the project through the bidding of supporting projects.
After that, it is necessary to pass the process review, material review, ground function test, ground static test, installation assessment, and installation review before becoming a qualified supplier of materials for related models. The whole process takes a long time, and it is normal for one or two years, or even longer.
Therefore, the typical long-term investment period and high-return period are proportional to the typical long-term investment period and high-return period in the king-use titanium alloy material business. For ordinary titanium alloy manufacturers with weak capital and R&D capabilities, the entry threshold is relatively high.
Of course, this certification process depends on Junfang, and it can take a few months if it is quick.
Mu Yang understands that this kind of process does have to go through various complicated experiments, and the time period is relatively long.
He doesn't like these rules and regulations.
But if you really want to go to the king's market and mix in the land of Huaguo, you have to listen to the king's opinion.
If you don't use it, it can be used for experiments, or it can be used in the civilian market.
Titanium alloys are raw materials, not finished products, and the restrictions are different.
For example, Xinghai Group wants to build rockets, is that okay?
Certainly not!
Because there is no production qualification and four certificates of Jungong, it doesn't mean that you can make it if you have the ability, and you are not even allowed to do experiments.
When Xinghai Materials Co., Ltd. registered, it had indicated the business scope of non-ferrous metal production and processing, and it was fine to produce titanium alloy plates.
However, when it comes to high-performance titanium alloy materials, if he wants to enter the civilian market, it may be restricted from listing due to its superior performance and can only be sold to Junfang.
Of course, if you don't need to do such a good performance or limit the number, that's okay.
The above is not allowed to go to the civilian market, it is just a possibility.
Specifically, Mu Yang had to ask the people in the company to first register with the H City National Defense Science and Technology Industry Management Department and apply to other departments.
At present, it is still far from mass production, and Mu Yang plans to move the equipment to the headquarters base.
After the National Day, some factories in the headquarters base can be put into use, and it is only a little over a month away.
After careful consideration, Mu Yang explained to Long Xuan:
"After the experiment, pack the equipment, and move the equipment after the National Day. If you can't move it as a whole, you can disassemble it and move it again, but you need to label it in advance to facilitate reinstallation. I will arrange the four certificates of Jun Gong, and you will do the experiment well. Just do what you want."
Mu Yang glanced at the equipment in the factory, there are many, there are 2400kw EB furnace, 15 tons of vacuum consumable electric arc furnace, mixing system, 10,000 tons hydraulic press, fast forging machine, 10,000 tons free forging machine, vacuum plasma welding box, 3.3-meter reversible hot-rolling mill, 1.2-meter four-high reversing hot-rolling mill, cold-rolling mill, vacuum annealing furnace, sanding machine and other equipment.
Many of them are imported from Germany, Austria and island countries, and then modified in their own factories, mainly adding automatic operating systems.
Of course, not all devices have to be disassembled.
"Okay, no problem." Long Xuan suddenly felt a heavy heart.
Writing these two chapters is too brain-intensive and hard-core, so let's make do with it. Button group 221300748