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HastelloyB-3
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Material brand: Hastelloy HastelloyB-3
American grade: UNSN10675
Hastelloy B- 3(n10675) Hastelloy
Hastelloy B- 3(n10675) is a nickel-based high-temperature alloy composed of nickel, molybdenum, cobalt and other elements, with a nickel content of about 65%. Hastelloy B- 3(n10675) nickel-base alloy is a new material developed on the basis of Hastelloy B2, which improves the thermal stability and corrosion resistance of the material, and improves the hot and cold forming properties. In recent years, it has been more and more used in the production of chemical equipment.
Hastelloy B- 3(n10675) chemical composition
C≤ Si≤ Mn≤ P≤ S≤ Cr≥ Ni≥ Mo≥ With 0.01 0.10 3.00 0.030 0.010 1.00-3.00 65.0 27.0-32.0 0.20 Nb/Ta≤ Al≤ Ti≤ Fe≤ Co≤ V≤ W≤ Ni Mo. Ta≤ 0.20 0.50 0.20 1.00-3.00 3.00 0.20 3.00 94.0-98.0 0.20 Main features, welding and processing of Hastelloy B- 3 (N10675)
● Material analysis: Hastelloy B- 3(n10675) alloy plate solid solution mechanical properties: with the increase of heating temperature, its tensile strength, yield strength and elastic modulus decreased, while the elongation, thermal expansion coefficient, thermal conductivity and specific heat increased slightly; with the increase of cold deformation rate, its hardness, tensile strength and yield strength increased, elongation decreased.
● Forming process characteristics: Through analysis, the forming process characteristics of Hastelloy B3 alloy mainly include:
(1) The results show that the cold forming conditions of Hastelloy alloy and B alloy are higher.
(2) Hastelloy B- 3 has higher hardness than austenitic stainless steel, and the work hardening tendency is more obvious, so greater pressure or step forming is required during cold forming.
(3) When the cold forming deformation rate of the Hastelloy B- 3 is less than 10%, the corrosion resistance of the workpiece is not affected, but the existence of residual stress will cause hot cracks in the weld. Therefore, for the later welding of the workpiece, should try to eliminate the influence of residual stress.
(4) Cold forming with severe deformation can improve the yield ratio of Hastelloy alloy B- 3 material, and improve the stress corrosion sensitivity and crack sensitivity of the material.
(5) Hastelloy B- 3 is very sensitive to low melting point metals such as oxidation medium, sulfur, phosphorus and lead at high temperature.
(6) In the temperature range of 600~800 ℃ and too long heating time, Hastelloy B3 will produce brittle phase, resulting in a decrease in elongation. In addition, when the external force or deformation is restricted, thermal cracking is liable to occur in this temperature range. Therefore, the temperature must be controlled above 900 ℃.
(7) Hastelloy B- 3 material processing before pressing, should be in contact with the workpiece mold surface cleaning, cold processing can be used lubrication method, forming should be immediately after degreasing treatment or alkaline washing.
(8) After the workpiece is discharged from the furnace and cooled, the surface oxide film is thicker and should be fully pickled. If there is a residual oxide film, cracks may appear during the next stamping, and if necessary, sand blasting can be performed before pickling.
Welding and forming
(1) Before forming, if the blank needs to be spliced, it is best to choose the GTAW welding method, which can better protect the weld from oxidation. If manual arc welding is used, it is easy to cause oxidation of the middle weld bead. Even if each layer is polished and cleaned, it is difficult to ensure thorough cleaning, and there is a small amount of residual oxide layer, which may also form a factor affecting the processing performance of the weld. Before welding, the attachment and oxide layer on the surface of the groove and the base metal must be removed, because the existence of oxide film and impurities will affect the performance of the weld and the heat affected zone. It is best to use a small current to avoid too slow and swing. The interlayer temperature shall be controlled below 100 ℃. The front and back should be protected with argon to avoid high-temperature oxidation and combustion of alloying elements. Before pressing, the surface of the weld shall be polished and smooth, the thicker oxide layer on the surface of the weld shall be removed, and pickling shall be supplemented. Because the oxide layer of the Hastelloy B- 3 material weld is hard, it is difficult to remove it by direct pickling. It is easy to produce small cracks in the process of stamping forming, which affects the performance of the weld.
(2) The advantage of hot forming is that it can be formed at one time to avoid work hardening. If the forming temperature can be controlled, heat treatment can be avoided. However, during the thermoforming process, the temperature changes greatly, and each area is not the same. Even the surface directly in contact with the mold may be far lower than the temperature inside the metal, which is difficult to measure and control. Once the local material enters the sensitive temperature zone during processing, it is difficult to eliminate defects such as microcracks in the subsequent solution heat treatment. According to the experience of the processing plant, the cold forming process was selected. Pressing method preferred method of molding. When spinning is necessary, cold spinning or warm spinning should be used at a temperature not exceeding 400°C.
Key words:
HastelloyB-3
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