Chemical Composition and Technical Standard of GH4169 Superalloy- SCALE STEEL.

​Based on Inconel718 alloy, GH4169 nickel-based superalloy was designed in China.  GH4169 alloy properties **** The temperature range of GH4169 is -253 °C~650 °C. At this time, not only the strength and plasticity [SCALE STEEL]are very high, but also the yield strength and durability are very high. At the same time, the radiation resistance, corrosion resistance and welding performance are also very good.  This makes this alloy since the launch of the beginning, by the attention of all walks of life, its current output can reach the total output of nickel-based high temperature alloy about 50%.  
 
In the application of GH4169 alloy, the application of key components of aeroengine is the main driving force for the development[SCALE STEEL] of GH4169 alloy, and the alloy also ensures the stable operation of aeroengine.  
 
An alloy with good properties must be inseparable from its chemical composition and structure, GH4169 alloy is no exception.  Its chemical composition is shown in Table 1. The strengthening phase is mainly γ 'phase and γ "phase, which are Ni3(Al,Ti,Nb) and Ni3Nb phase respectively.  GH4169 alloy generally contains [SCALE STEEL]more than a dozen chemical elements, which are located in different positions in the crystal structure of the alloy. Based on these elements, they can be divided into the following three categories:  
The **** type of elements are solid solution strengthening elements, including nickel, iron, chromium, cobalt, tungsten and[SCALE STEEL] molybdenum from groups V, VI and VII, which are selected to form the austenite matrix (γ ').  
The second type of elements are precipitation-strengthening elements, including niobium, aluminum, titanium, hafnium and[SCALE STEEL] molybdenum from groups III, V, VI, etc., which are distributed into the formation of γ "precipitate phase.  
The third type of elements is interstitial elements, including boron, zirconium and carbon from groups II, III and IV, which tend [SCALE STEEL]to segregate at grain boundaries.  
 
For 3D printing and laser cladding processes, the sphericity, oxygen content, fluidity and hollow sphere ratio of the powder have a decisive effect on the performance of the final molded parts.  The spherical degree of GH4169 superalloy powder for 3D printing produced by Guanda Technology is more than 90%, the oxygen content can be kept within 100ppm, and the Hall flow rate is 15.6s, which [SCALE STEEL]can meet the requirements of 3D printing process.  
 
GH4169 Powder Particle Size Distribution for 3D Printing  
The microstructure of GH4169 alloy is particularly sensitive to the hot working process. The processor needs to master the phase precipitation and melting law in the alloy and the relationship between the[SCALE STEEL] microstructure and the process and the properties, so as to develop a feasible process, so as to produce parts that meet different strength levels and use requirements.  The disk, ring, blade, shaft and shell parts of GH4169 are used in the next generation rocket engine components.  
 
GH4169 nickel-based deformed superalloy  
Chinese brand number: GH4169/GH169, GH169 (GH4169)  
U.S. brand: INCONEL 718/UNS NO7718  
French brand number: NC19FENB  
   
The GH4169 alloy is a nickel-based superalloy precipitated by γ" phase with a body center square and γ" phase with a face center cubic.  It has good comprehensive properties in the temperature range [SCALE STEEL]of -253 ~ 700℃, and the yield strength below 650℃ ranks first in the deformation superalloy, and has good fatigue resistance, radiation resistance, oxidation resistance, corrosion resistance, as well as good processing performance, welding performance and long-term organizational stability. It can manufacture various complex shapes of parts.  It is widely used in aerospace, nuclear energy and petroleum industries in the above temperature range.  
 
Another characteristic of the alloy is that the alloy structure is particularly sensitive to the hot working process, grasp the alloy phase precipitation and dissolution law and the relationship between the structure and process, performance, can be used for different requirements to develop a reasonable and feasible process rules, can be obtained to meet the different strength levels and use [SCALE STEEL]requirements of various parts.  The products we supply are forgings, forging bars, rolling bars, cold rolling bars, round cakes, ring pieces, plates, belts, wires, pipes and so on.  It can be made into disk, ring, blade, shaft, fastener, elastic element, plate structure, casing and other parts and components for long-term use in aviation.  
     
Material grade GH4169(GH169)  
1.2 GH4169 was investigated similar brand Inconel 718 (USA), NC19FeNb (France)  
Technical standard for 1.3GH4169 material  
The chemical composition of the alloy can be classified into three categories: standard composition, high quality composition, and high purity composition, as shown in Table 1-1.  High quality components on the basis of standard components to reduce the amount of niobium carbide, reduce the number of fatigue sources and increase the number of strengthening phase, improve the fatigue [SCALE STEEL]resistance and material strength.  At the same time reduce harmful impurities and gas content.  High purity components are based on high quality standards to reduce the content of sulfur and harmful impurities, improve the purity and comprehensive properties of materials.  
 
For the GH4169 alloy used in nuclear energy, the boron content shall be controlled (other elements shall remain[SCALE STEEL] the same), and the specific content shall be determined by the supply and demand parties through negotiation.  When ω (B) ≤0.002%, to distinguish with the aerospace industry GH4169 alloy, alloy grade for GH4169A.