格隆汇2月11日丨上大股份(301522.SZ)在互动平台表示，在核工程领域，目前公司已成功研制并交付核 工程用高温合金GH3535、Inconel 718等多牌号产品，批量应用于国内部分三、四代核工程项目。同 时，公司经过长期研发和技术积累，部分产品可应用于可控核聚变、钍基熔盐堆等四代核技术项目中。 ...

争议点在于：GH4141是否应采用粉末冶金（PM）+热等静压（HIP）路线替代传统锻轧+固溶+时效。支持 PM路线观点认为PM+HIP能消除铸锻缺陷、提高均匀性，GH4141的疲劳寿命受益；反对者强调PM成本、 晶界污染和大件制造难度。两路对比实测：PM-GH4141疲劳寿命提高约15%，但成本上升约30%（按LME 原料价计，参见下文）。 作为有20年经验的材料工程师，我推荐GH4141高温合金用于600–750°C工况。GH4141合金成分以Ni-Cr-Co 为主，γ′相和碳化物协同强化。试验依据采用ASTM E8室温拉伸和GB/T 228.1国内高温拉伸方法校准。 实测参数对比显示：GH4141室温抗拉强度1100 MPa、屈服950 MPa；GH4141在650°C抗拉780 MPa； GH4141氧化100 h@800°C质量增重0.35 mg/cm2（数据均为批内平均）。 与竞品对比，维度选为强度与抗氧化 对比维度一（强度）：GH4141室温UTS 1100 MPa，Inconel 718为1050 MPa，Haynes 230为980 MPa； GH4141在650°C保持率更高，说明GH414 ...

Core Insights - The article discusses the mechanical properties and processing methods of the nickel-chromium alloy GH3128, highlighting its density and tensile strength variations based on different manufacturing techniques [2][5][6]. Group 1: Mechanical Properties - GH3128 exhibits varying densities and tensile strengths across different samples: Sample A (hot-rolled) has a density of 8.25 g/cm³, tensile strength (Rm) of 980 MPa, and yield strength (σ0.2) of 680 MPa; Sample B (forged) has a density of 8.28 g/cm³, Rm of 1020 MPa, and σ0.2 of 720 MPa; Sample C (powder metallurgy) has a density of 8.22 g/cm³, Rm of 950 MPa, and σ0.2 of 660 MPa [2]. - The mechanical performance of GH3128 can meet industry standards when processed under specific heat treatment conditions as per ASTM E8/E8M and AMS 2750 [3]. Group 2: Cost and Market Comparison - The cost of GH3128 is influenced by fluctuations in chromium prices on the LME and nickel prices on the Shanghai Nonferrous Metals Network, which also affect the price differences with competing products [4]. Group 3: Microstructural Analysis - The microstructure of GH3128 consists of a nickel-based solid solution with significant chromium solid solution strengthening, and the presence of titanium/aluminum or carbon leads to the formation of carbides or precipitates [5]. - Heat treatment results in the accumulation of carbides at grain boundaries and twin boundaries, which directly correlates with density and fracture toughness differences [5]. Group 4: Processing Techniques - There is a technical debate regarding the superiority of the ingot-VAR/ESR + hot-rolling route versus the powder metallurgy + hot isostatic pressing route for GH3128, with proponents of each method citing cost-effectiveness and defect control as key advantages [6]. - A decision tree for processing suggests that for components larger than 300mm and in quantities over 100, the ingot route is preferred, while for smaller batches requiring high density, powder metallurgy is recommended [6]. Group 5: Common Misconceptions - Common misconceptions in material selection include focusing solely on room temperature tensile properties, assuming powder routes are always superior, and neglecting the importance of heat treatment and temperature control standards [7]. Group 6: Conclusion - GH3128, as a nickel-chromium-based high-temperature alloy, shows a dependency on processing methods for its density and tensile properties. By adhering to dual standard systems (ASTM E8/E8M, GB/T 228.1, and AMS 2750), a balance between cost and performance can be achieved [7].

Core Viewpoint - The company has successfully developed and delivered high-temperature alloys for nuclear engineering, indicating a strong position in the nuclear technology sector [2]. Group 1: Product Development - The company has successfully developed and delivered high-temperature alloys such as GH3535 and Inconel 718 for nuclear engineering applications [2]. - These products are being used in domestic third and fourth-generation nuclear engineering projects [2]. Group 2: Technological Advancements - The company has a long-term research and technology accumulation, leading to the application of some products in advanced nuclear technology projects like controlled nuclear fusion and thorium molten salt reactors [2].

Core Insights - The company has successfully developed and delivered high-temperature alloys such as GH3535 and Inconel 718 for nuclear engineering applications, which are being used in domestic third and fourth-generation nuclear projects [2] - The company has a long-term research and technology accumulation, with some products already applied in advanced nuclear technologies like controlled nuclear fusion and thorium molten salt reactors [2] - The company plans to increase its research efforts in high-temperature alloys for nuclear applications and continue to expand its product applications in the nuclear power market [2]

Summary of High-Temperature Alloy Industry Conference Call Industry Overview - High-temperature alloys are critical materials for aerospace engines, enhancing oxidation and corrosion resistance through elements like chromium, cobalt, and molybdenum. The most widely used nickel-based high-temperature alloy is Inconel 718, utilized for manufacturing blades and disks [1][6]. - Single crystal high-temperature alloys exhibit strong heat resistance, primarily used for turbine blades and shrouds [1][7]. - In aerospace engines, forged high-temperature alloys account for the highest proportion (60%-70%), followed by cast high-temperature alloys (20%-30%) and powder high-temperature alloys (approximately 10%) [1][9][10]. Market Dynamics - Boeing's delivery volume has declined due to the 737 MAX incident and FAA restrictions, while Airbus's delivery volume, although not meeting expectations, continues to rise [1][12]. - The aerospace supply chain faces bottlenecks, including tight titanium supply (affected by the Russia-Ukraine war) and insufficient production capacity (equipment and personnel shortages) [1][13]. - High-temperature alloy production faces capacity constraints, with rising nickel prices and market dominance by major players like PCC and ITC [1][14]. Production Challenges - The production cycle for high-temperature alloy equipment from design to operation typically exceeds two years, involving equipment manufacturing, debugging, and certification [1][15]. - The expected resolution of supply-demand conflicts by 2028 is anticipated due to long-term agreements signed by international giants, promoting capacity investment [1][16]. Material Utilization Rates - The material yield from raw materials to components is relatively low, with casting processes yielding 30%-50% material utilization, and small parts yielding only 10%-20% [1][18][19]. - Powder metallurgy processes yield approximately 50%-60% powder recovery, but the final component yield can drop to 10%-20% due to machining losses [1][20]. Competitive Landscape - The international market is dominated by companies like APSHomekit, while the domestic market is led by firms such as Yingji and the Beijing Aeronautical Materials Research Institute [1][17]. - China has advantages in titanium alloys but faces significant competition from international giants in the high-temperature alloy sector [1][14]. Future Outlook - The supply chain issues affecting aircraft engine manufacturers like GE and Safran are primarily due to upstream supply constraints, with expectations for improvement by 2028 [1][21]. - The geopolitical landscape, including the Russia-Ukraine conflict and U.S.-China trade tensions, continues to impact resource availability and pricing [1][22][23]. Strategic Considerations - China's restrictions on rare earth exports significantly impact the high-temperature alloy and aerospace engine sectors, as these materials are crucial for single crystal blades [1][23]. - The industry is exploring alternatives to rare earth materials, including reducing their usage in high-temperature alloys and employing advanced cooling and coating technologies [1][24][25]. This summary encapsulates the key points discussed during the conference call, highlighting the current state and future prospects of the high-temperature alloy industry.