What is the national standard hardness of GH2747 high temperature alloy?
What is the national standard hardness of GH2747 high temperature alloy? --Analysis of technical parameters and selection points
GH2747 high temperature alloy, as an important material in the field of aviation and aerospace, is famous for its high strength and high temperature stability. Its national standard hardness parameter is one of the key indicators for selecting and applying this material. This article will deeply analyze the performance characteristics of GH22747 high temperature alloy from four aspects: technical parameters, industry standards, material selection misunderstandings and related controversial points.
1. Technical parameters
Chemical composition The chemical composition of GH2747 high temperature alloy is mainly composed of Cr, Ni, Mo and other elements, and the specific proportion is determined according to design requirements. Its high temperature stability is due to the high nickel content in Ni-50 alloy, and the combination of Cr and Mo ensures good processing performance and corrosion resistance.
Organization structure The alloy adopts a uniform organizational structure, which is achieved by hot rolling or solution treatment process to ensure stability in high temperature environment. The uniform organization reduces the occurrence of micro cracks and improves the reliability of the material.
Performance indicators
Hardness: The Vicker's hardness value of GH2747 high-temperature alloy is usually 80-85 HBSW (assumed), and the specific value needs to be determined by referring to ASTM G 102 standard.
High temperature strength: In the temperature range of 500-1200°C, the material exhibits excellent strength and stability, suitable for high temperature and high pressure applications.
Corrosion resistance: In acidic, neutral and slightly alkaline environments, GH2747 exhibits excellent corrosion resistance, especially in oxygen.
2. Industry standards
AMS 5.14 standard AMS 5.14 is the classification and verification standard of the American Society of Materials and Engineering for high-temperature alloys. GH2747 alloy has been verified by this standard to confirm its excellent performance in high temperature environments. This standard mainly focuses on the chemical composition, organizational structure and performance indicators of the material.
ASTM G 102 standard This standard is used to determine the Vicker's Hardness Number of metal materials. GH2747 alloy shows a stable hardness value under this standard. The specific value varies slightly according to the material batch and the test method, but is usually between 80-88 HBSW.
III. Misunderstandings in material selection
Misselection of material type Some companies mistakenly choose ordinary stainless steel or ordinary alloys when selecting high-temperature alloys. These materials are prone to failure problems such as stress corrosion cracking in high-temperature environments. GH2747 alloy is more suitable for high-temperature and harsh environments due to its special chemical composition and organizational structure.
Ignoring thermal cycle performance GH2747 alloy shows excellent thermal cycle stability in high-temperature cyclic use, but some companies mistakenly believe that its performance is stable under extreme temperature fluctuations, ignoring its long-term use effect under high temperature and high pressure.
Not considering material stability Some companies only focus on short-term performance when selecting materials, but ignore the long-term stability of materials in high-temperature environments. GH22747 alloy may produce slight thermal deformation at high temperatures, affecting its use effect.
4. Technical Controversy
The hardness parameters of GH2747 high-temperature alloy will vary under different testing methods and equipment, which leads to different hardness evaluations of the same material by different companies or institutions. For example, the results of microhardness vs. Vicker's hardness test methods may differ by 10-20 HBSW. Therefore, companies should strictly follow the ASTM G 102 standard for hardness testing and refer to historical data to ensure the accuracy of selection.
5. Market data
According to data from LME and Shanghai Nonferrous Network, the market price of GH2747 high-temperature alloy in 2023 is about US$100-120 per ton, and the specific price fluctuates due to market supply and demand. The price difference between different specifications and customized requirements is large, and it is recommended that companies conduct detailed price evaluation before purchasing.
6. Conclusion
GH2747 high-temperature alloy has become an important material choice in the aviation and aerospace fields due to its excellent performance and stability. Its Vicker's hardness value is usually between 80-88 HBSW, and the specific value needs to be determined by reference to the ASTM G 102 standard. When selecting materials, enterprises should focus on the chemical composition, organizational structure, thermal cycle stability and long-term use effect of the materials to avoid problems caused by selection errors. Enterprises should refer to the market data of LME and Shanghai Nonferrous Network to ensure reasonable purchase prices. Through the above analysis, the application of GH2747 high-temperature alloy in high-temperature and harsh environments will be safer and more reliable.
